Certificate to Operate Control Apparatus by mdr12000


Certificate to Operate Control Apparatus document sample

More Info
NUMBER                           No

     1   EN 50 014      1        26

     2   EN 50 020      1        6.3

     3   EN 50 020      1

     4   EN 50 014      1

     5   EN 50 014      1        26

     6   EN 50 014    1&2        26

     7   EN 50 014    1&2         6

     8   EN 50 014    1&2        26


    10   EN 50 020    1&2        6.3

    11   EN 50 014      1        26

    12   EN 50 028
13   EN 50 014   1&2   26

14   EN 50 020   1&2

15   EN 50 018    1

16   EN 50 019   1&2

17   EN 50 020    1     9

18   EN 50 014    1     1

19   EN 50 018    1

20   EN 50 014    1     7

21   EN 50 018    1

22   EN 50 018    1

23   EN 50 014    1    16.4

24   EN 50 016    1    1.3
25   EN 50 016   1      5

26   EN 50 016   1

27   EN 50 018   1

28   EN 50 014   1     26

29   EN 50 019   1

30   EN 50 019   1

31   EN 50 014   1      _

32   EN 50 018   1

33   EN 50 018   1

34   EN 50 014   1    22.4.9

35   EN 50 017   1

36   EN 50 014   1      1
37   EN 50 014    1

38   EN 50 018    1

39   EN 50 018    1

40   EN 50 018    1

41   EN 50 018    1

42   EN 50 014   1&2

43   EN 50 014   1&2

44   EN 50 014   1&2

45   EN 50 014   1&2   26

46   EN 50 016    1

47   EN 50 016    1

48   EN 50 016   1&2
49   EN 50 016    1&2

50   EN 50 016    1&2

51   EN 50 018    1&2

52   EN 50 019    1&2

53   EN 50 020    1&2

54   EN 50 020    1&2

55   EN 50 028    1&2

56   BS5345:pt4    1    6.3.3

57   EN 50 014     1     2

58   EN 50 014     1    13.3

59   EN 50 018     1    15.2

60   EN 50 018     2    16.2
61   EN 50 018   1

62   EN 50 019   1    4.7.4

63   EN 50 020   1    5.5.3

64   EN 50 020   1   General

65   EN 50 020   1     1.2

66   EN 50 020   1     10

67   EN 50 020   1    5.5.8

68   EN 50 020   1     6.2

69   EN 50 020   2

70   EN 50 020   1

71   EN 50 020   1    6.4.1

72   EN 50 020   1    6.4.1
73   EN 50 020   1    6.4.1

74   EN 50 020   1    5.5.4

75    BS6941     1    9.5.2

76    BS6941     1    9.5.2

77    BS6941     1     6.1

78    BS6941     1     9.5

79    BS6941     1

80    BS6941     1    8.6.c

81    BS6941     1   General

82   EN 50 020   1    9.4.1

83   EN 50 020   1     4

84   EN 50 020   1     8
85   EN 50 020   1&2

86   EN 50 020   1&2

87   EN 50 020   1&2     6.5

88   EN 50 020    1       4

89   EN 50 020    1      9.4

90   EN 50 020    1    Annex A

91   EN 50 020    1       9

92   EN 50 018    1       5

93   EN 50 020    1      6.3

94   EN 50 020    1     7.1.3

95   EN 50 018    1

96   EN 50 018    1     18.1
97    EN 50 020    1     9.4

98    EN 50 020    1     9.4

99    EN 50 014    1

100   EN 50 014    1      6

101   EN 50 014    1     1.3

102   EN 50 014    1

103   BS5345:pt4   1    6.3.3

104   EN 50 028    1    4.5.2

105   EN 50 028    1    4.1.3

106   EN 50 016    2     12

107   EN 50 016    2     12

108   EN 50 020    2     6.1
109   EN 50 020   1&2       -

110   EN 50 020   1&2   Table 2/4

111   EN 50 020   1&2

112   EN 50 014    1       26

113   EN 50 018    2        -

114   EN 50 018    2        -

115   EN 50 018    2        -

116   EN 50 018    1      10.1

117   EN 50 020   1&2

118   EN 50 020   1&2

119   EN 50 020   1&2   Annex A

120   EN 50 018    1       10
121   EN 50 014   1&2

122   EN 50 020    2       8

123   EN 50 020    2      6.6

124   EN 50 014   1&2    7.1.2

125   EN 50 020   1&2     5.1

126   EN 50 014    1      6.3

127   EN 50 020    1      5.3

128    BS6941      1

129   EN 50 039    1      all

130   EN 50 016    1

131   EN 50 020   1&2     5.1

132   EN 50 020    1
133   EN 50 020   1&2     6.3

134   BS 6941      1     5.5.3

135   BS 6941      1     Scope

136   EN 50 018   1&2    19.3

137   EN 50 014   1&2

138   EN 50 014    2      27

139   EN 50 014   1&2     26

140   EN 50 016    2      1.4

141   EN 50 020   1&2

142   EN 50 018    1     19.3

143   EN 50 021    1

144   EN 50 017    2
145    EN 50018       16.2

146     BS 6941        8.6

147   BS EN 50020   Table 3

148    EN 50014

149    EN 50020       7.4.1

150     BS 6941     5.3 & 8.3
      PREN 50021    4.1 & 12

151    EN50050        4.2.3

152    EN50020      7.4.6 &

153    EN50020      10.9.3(b)

154    EN 50014       7.3.2

155    EN 50014       7.3.2

156    EN 50014        7.3
157   EN50019    

158   BS 6941               7
                          Table 2

159   EN 50014     1         26

160   BS7117     Part 1   8.13.2(b)

161   BS 7117    Part 1    8.10.5
                 1991      8.10.6

162   BS 7117    Part 1

163   EN 50020     2       6.4.8

164   EN 50018     2         8

165   EN 50018     2        N/A

166   EN 50020     2       6.4.2

167   EN 50018     2        11.1

168   EN 50014     2
169     EN 50014        2       5.2

170     EN50014         2       5.3

171     EN 50018        2        8

172     EN 50018        2       11.6

173     EN 50028        2

174   Atex Directive          Annex II
         94/9/EC             ESHR 1.0.5

175     EN 40016                4.2

176     EN 50014       1&2      B3

177     EN 50020        2       8.8

178     EN 50014        2       7.3

179     EN 50014        2       7.3

180     EN 50014        2      3.15
181     EN50014        2

182     EN 50014       2      7.3.2

183     EN50014        2   7.1.2 & 7.2

184     EN 50020              6.4.8

185   Atex Directive        Annex II
         94/9/EC           ESHR 1.4.2

186     EN 50020              10.9

187     EN 50020              7.1

188     EN 50018             15.1.2

189     EN 50020              8.8
          1999               para 3

190     EN 50018              6.1

191     EN 50014              N/A
192     EN50014               7.3
        EN50284               4.4
193     EN50020           6.4.2

194     EN50014

195     EN50014

196     EN50020        7.1 & 7.5.3

197     EN50014:           7.3
       prEN50303:          4.7
198   Atex Directive    Annex II
         94/9/EC       Clause 1.05
                        - Marking

199     EN 50019

200    EN 50014          23.4.7

201     EN 50021          3.17
          1999            21.3

202     EN 50020          10.8

203     EN 50014          21.1

204     EN 50018          11.5
205    Directive           2.2

206    EN 50019            5.2

207    Directive           All

208    EN 50014            7&8

209    EN 50020            7.2

210    EN 1755            5.1.2

211    EN 1755 

212    EN 1755

213    Directive       Article 8(2)
       94/9/EC       Annex II Clause

214    EN 50014            24
       EN 50018            16

215      EN                ALL

216   prEN12874            ALL
217                EN                     ALL

218   EN 50284:1999 & ATEX Guidelines   1, 4.11

219            EN 50281-1-1             4.2.3

220             prEN 13617              Entire

221              EN 1755                Entire

222               EN1127

223              EN 50014                Non
                   1997                 specific
                 EN 50018
224              EN2000
                    50014                23.4.6
                   1997                 23.2,23

225              EN 50303                 All

226            IEC 62086-1                All

227            EN 50281-1-1              7.5.1
228   EN 50281-1-1    4.2.3

229   EN 50281-1-1   1 Scope

230    EN 50020       6.4.7

231    EN 50014

232    EN 50018      C 3.1.2

233   prEN 13463-1     ALL

234   prEN 13463-5     ALL

235   prEN 1127-2      ALL

236     BS 229         ALL

237     BS 6941        ALL

238     BS 4683        ALL
         Part 2

239     DD ENV         ALL
240             EN50018                 C.2.4.1

241            EN 50019                  6.7
                 2000                 Annex C.2

242             EN50018

243             BS IEC                    ALL

244         EN 50014:1997               General
            EN 50018:2000

245             BS 6351                   ALL

246               prEN                    ALL

247               EN                      ALL

248             94/9/EC                   2.3
              Cat 3 Equip
            (EN 50021:1999)              (8.1)

249   94/9/EC (ATEX 100a directive)    94/9/EC -
       89/686/EEC (PPE directive)     Article1 (4)

250               EN                       6

251     BS EN 62013-1: 2002 &             ALL
           IEC 62013-1:1999
252       EN 61779-1           ALL
          EN 61779-4
253   CEN/TC 286/WG 6/SG6      ALL

254      IEEE 515:1997         ALL

255      AS 2380.1:1989        ALL
         AS 2380.2:1991
         AS 2380.4:1994
         AS 2380.6:1988
256      AS 2380.7:1987
         EN 50014:1997        Cl 1.1
         EN 50020:2002

257      pr EN 14678-1

258      EN 50281-1-1          10.4

259     EN 50 028: 1987     7.2 & 6.2.4

260         Directive       Chapter 11

261    EN 60079-25: 2004       ALL
        (IEC 60079-25:

262       EN 60079-15          ALL

263       EN 60079-7           ALL
264   prEN 13617-2     ALL

265    EN 50394-1      ALL

266   EN 502841999    4.2.5

267     EN 50050     4.2.1,
          2001       4.3.1,

268   prEN 13463-6     All
        Aug 2002

269    EN 60079-0      ALL

270    EN 60079-1      ALL

271    EN 60079-2      ALL

272    IEC61421-0      ALL

273    IEC61421-1      ALL

274     EN 50020

275     EN 50014
276    EN 50018

277    EN 50014

278    EN 50018      14

279     EN50020

280    EN 50020

281    EN 50020

282    EN 50020

283    EN 50020

284    EN 50018

285    EN 50014

286     BS 7202

287   EN 61241-18
      IEC 61241-18
288      IEC 60079-27

289      EN 60079-26
         IEC 60079-26

290      IEC 61241-11             ED 1
             2004           CDV(31H/171/CDV)

291     EN 50381:2004



294      EN 60079-15                           Table 1

295      IEC 61241-11

296       EN 13617-1                            ALL

297       IEC 61241-0                           27.1

298       EN 14678-1                            ALL

299    EN 60079-0:2004,                        26.4.2
      EN IEC 60079-0:2006
300                                              ALL
               EN 13617-2 2003

301               M Wilson

302              EN 13617-3:                     ALL

303              EN 13617-4                      ALL

304              EN 60079-15                   cl 26.4.2
                 EN 60079-0

305             EN 13616:2004                     All

306                 VOID

307            IEC 60079-1:2007                Clause

309           IEC 60079-18:2004                 7.9.1

310            IEC 60079-0:2007                 8.1.2

311   EN 60079-11:2007 IEC 60079-11:2006         5.4

312            IEC 60079-1:2007            6    2.4.3
       313            EN 13616:2004+Corr1                             All

       314               EN 14986:2007

       315               EN 14986:2007

       316             IEC 60079-28 2007                              All

       317              EN 13463-1:2009                               All

       318              EN 13463-2:2004                               All

       319              EN 13463-3:2005                               All

       320             IEC 60079-31:2008                              All

       321              EN 14986 :2007                                All

       322   IEC 60079-7:2006(ed4)EN 60079-7:2007                   Annex H

NOTE                          Numbers 323 to 332 have not been allocated

334        IEC 60079-0 : 2007 Annex Ai              All

335                   VOID

336   IEC 60079-11 2006 & EN 60079-11 2007      7.3 & 3.10

337 60079-7:2006EN 60079-7:2007EN 50019:1977      Cl 5.5

                                                  Cl 4.5

338            IEC 60079-18:2009               7.3.1 Table 2
                                               7.3.2 Table 3

339    IEC 60079-0 2009 & EN 60079-0 2009         26.1O

340         Tech Equiv 60079-18:2009                All
26.5 & 26.6 Can the certification label of an apparatus carry a supplier's name instead of
            the manufacturer's name?

     -       The parameters of batteries which have been determined by test may change
             if the battery manufacturer upgrades the battery. What control, if any, should
             the Test House exercise?

     -       Does a certification body need to take any action in respect of undisclosed
             changes in batteries used in certified IS apparatus?

EN 50 014    Is it permissible to use an anti-static warning label on eg a plastic membrane    keypad as an alternative to testing even if the use of the keypad may promote
             static charging?

     -       Can the name or trade mark of the manufacturer be replaced by that of the
             selling company?

             How do Components relate to Apparatus certificates in respect of the
             amendment status of the standards?

  22.4.7     What is the legal status of the amendment to clause 6?

             What language is to be used for warning labels?

 7.4, 7.6,   Is the spark test apparatus to be applied within encapsulation?

             Can Components bear the Distinctive Community Mark?

             Can spaces with a gross volume >100ml be filled with loose inert material to
             achieve a free volume <=100ml?
            How is temperature classification of components to be dealt with?

            Can subminiature fuses be used in barriers with rated voltages not exceeding

EN 50 019   Are bending tests required for flameproof heat trace cables? Is earth fault
            protection required?

            Are Pinch, Pressure or Sliding contacts permitted for internal connections?
             How are external connections defined?

            Under what circumstances may a circuit be assessed rather than tested?

            What are the limits of use applied to oxygen analysers?

            Can pressure transducers using capillaries be certified as Ex d

            Can portable apparatus for use in Group I have enclosures constructed from a
            light alloy

            Are spigot joints with a rectangular shape permitted by this standard

            Are spigot joints with a rectangular cross section consisting of a flat part and a
            spigot part permitted

            How are plastic fan hoods to be considered

            What is the meaning of the note at the end of clause 1.3
          Is it possible to issue a Certificate of Conformity for safety devices such as
          those used to monitor time and flow of protective gas?

          Can purge control units be certified under the European directives

          What requirements need to be applied to certificate of conformity for Ex d
          enclosures which can have different components built into them

  4.2     How is apparatus which depends on the temperature of its installation to be

          Do electrical traction batteries require an earth connection if they are in good
          electrical contact with the chassis of the vehicle.

          How are power transformers in EEx e to be tested.

  26      Can the epsilon-X be marked on Group I components?

          Are there any alternatives to the flammability test defined in ISO R 1210

  5.2     How is the 'delay before opening' of a enclosure which contains complicated
EN50014   parts assessed

          In addition to the tests in 22.4.9 and 22.4.10, which tests are applied to plastic
          cable glands.

          Are there any relaxation's in the distances between live parts for apparatus
          protected by this method

          Can a certificate of conformity be issued for apparatus which is intended to be
          used in conditions not foreseen by EN50014? eg higher oxygen concentration
          or higher pressure
Who is responsible for ensuring the use of the correct cell or battery in
certified apparatus, particularly in the case when the performance of the cell
has been enhanced.

How is the wear which may be experienced by a push rod or spindle assessed,
and how is it determined if bearings are required

Is an enclosure comprising concentric cylindrical sleeves, each with an
aperture, such that when the apertures are aligned the interior is accessible,
but when not aligned correct flamepaths exist, permitted?

Is the use of batteries within Ex d enclosures permitted

Can non-gassing batteries be used inside Ex d enclosures

Can the static warning label be applied to any non metallic material without

Can the IP requirements for fans be relaxed if the fan is located in a duct, as
for example in the case of a Air Conditioning Unit.

How are the flying leads between two pieces of Ex apparatus to be assessed
(This does not relate to Ex i)

If the manufacturer requests dual certification (ie two protection concepts) are
there any special considerations dual i & N marking/certification?

Are swagelock type fittings adequate in an Ex p enclosure for pipe work which
is used to carry flammable substances?

Can a flammable gas which is always above its flammable limit be used as the
protective gas in Ex p enclosures?

Can the delay before opening of an Ex p enclosure be assessed
            How is the determination of the temperature class to be conducted for Ex p

            Can a certificate of conformity be issued for an empty Ex p enclosure?

            How is the temperature rise of an Ex d motor fed through a frequency
            converter to be determined.?

            How is apparatus protected by type of protection 'e', an input voltage, and
            unspecified external power, to be considered

            How is the temperature classification of small coils to be obtained?

            How are the flying leads between two pieces of Ex i apparatus to be assessed

            How is apparatus protected by type of protection 'm', an input voltage, and
            unspecified external power, to be considered

    -       Is the stored energy in the definition of "Simple Apparatus" calculated from
            the parameters of the simple apparatus or from the parameters of the system
            to which it is added?

            What is a bushing?

EN 50 020   Are internal and external earthing or bonding connections required on metallic
            enclosures of IS apparatus?
            If yes, what current rating and methods of conductor terminations are
 15.1.1     Does the exemption from routine pressure test apply to enclosures <=10cm3
            whether or not the reference pressure has been measured?

 16.1.1     Does the exemption from routine pressure test apply to enclosures <=10cm3
            whether or not the reference pressure has been measured?
          Can grub screws be used to secure threaded covers of flameproof enclosures.

   -      If a trace heating tape passes all the mechanical tests in the standard but does
          not have an electrically conducting covering can it be certified?

 Fig 4    The standard refers to potting boxes of insulating material. Can metallic,
          glass/quartz/sapphire and composites thereof be used?

   -      Can variable capacitors be considered as non-sparking?

   -      Clause 1.2 waives the impact test in Pt1. A component certified Ex ia s is to be
          used in IS apparatus and the component certificate requires an impact test to
          be considered for the complete apparatus. What impact test , if any, is
   -      An associated apparatus has both ia and ib hazardous area circuits. In which
          order should they appear in the certification coding?

Table 2   Is an unverified manufacturer's statement of CTI value sufficient or is
          verification/test required?

   -      Are electrochemical gas measuring cells to be considered the same way as
          "cells, batteries and accumulators"?

   -      Can the contribution of electrochemical gas measuring cells, whose parameters
          are below those for simple apparatus, to the circuits in the IS apparatus in
          which they are used be ignored?

   -      How are conductive plastics to be considered when used as case material for
          IS apparatus?

   -      How is the phrase "taken into account" to be interpreted in relation to
          transients and Zener Diode ratings?

   -      Can a shunt diode barrier be assumed to filter out transients?
  -      Should transients induced in a circuit by open-circuit of a neighbouring
         inductive circuit be considered?

20-16E   1mm thickness is allowed for encapsulation of an energy storing device and its
         protection. What are the requirements for other parts of the assembly?

9.5.4    Energy limited circuits with limiting diodes above the rated supply voltage.
         Which voltage is to be used to determine ignition capability?

9.5.4    Energy limited circuits with limiting diodes below the rated supply voltage
         which is non-ignition capable at the rated supply voltage. Which voltage is to
         be used to determine ignition capability?

  -      Apparatus fails the dielectric strength test because a surge suppression device
         connected to the frame breaks down. Can the apparatus be tested with the
         device disconnected?

  -      Apparatus contains sparking parts which are non-ignition capable and the
         voltage to the apparatus is limited externally. External reactance does not
         affect the ignition capability. Is this "apparatus containing energy limited
         circuits" or not?
9.5.3    The apparatus in not energy limited but has a "nominated" voltage. Is this a
         "partly defined parameter outside the apparatus"? and does 9.5.3 apply?

8.6.b    Is the rated voltage, (which is that which is prevented from being exceeded in
         service), the voltage of the limiting device in question or the voltage described
         in 8.6.b?

  -      Can variable capacitors be considered as non-sparking?

  -      When spark ignition testing wound devices the test current often decreases
         during the test proceeds due to temperature rise from self-heating. A similar
         problem exists with voltage limiting devices having negative temperature
  -      When assessing IS circuits for fault conditions how should "self-healing"
         components, eg capacitors, be dealt with?

  -      Can a "protective network", comprising similar circuits to a barrier, but not
         requiring encapsulation or earthing, be used to permit the connection of
         uncertified battery-powered equipment to an IS circuit.
     -       How can inductors fed from a combination of resistive and capacitive sources
             (eg a switch mode PSU) be spark ignition tested if a complete circuit redesign
             is required to achieve the safety factors?

     -       How is the addition of all sources of stored energy in a switch mode power
             supply to be dealt with on failure of the switching element?

     -       Does the protection which prevents lithium batteries from being charged have
             to be infallible?

     -       Is a fuse going open-circuit in an IS circuit to be considered as a countable or
             non-countable fault?

     -       What is the meaning of the penultimate sentence in 9.4, "Tests with the Spark
             Test Apparatus"? What is the purpose of the limited ambient temperature
             range (compared with EN50014) of 0 to 40 deg C?

     -       The curves in Annex A refer to metals by name. To what physical forms of the
             metals, eg plating, alloys etc., do the various curves apply?

     -       Clause 9 covers type tests of reactive circuits. Is the intention to cover only
             inductors and capacitors or are self-capacitance/inductance and stray
             capacitance/inductance to be included?

     -       Can a treaded joint, which is assembled with cement applied to the thread, be
             considered as a cemented joint?

    6.1      What is required to prevent a battery charger damaging safety components in
             IS apparatus?, 7.2 In an associated apparatus the supply voltage is 30Vdc and the inverter fed
             transformer is required to be infallible at mains voltage. What requirements
             should by applied to the transformer?

EN 50 020    An Ex d Flammable gas detector head is to be used in an IS circuit. Under
             what conditions is the temperature rise of the detector to be measured?

     -       This clause appears to exclude all of clause18 for non-metallic enclosures
             <10cm^3. Is this the intention and does this mean that no reference
             pressure or flame transmission tests are required?
    -       Small inductors often saturate when carrying the maximum current, including
            safety factor, obtained under the conditions of clause 4. The maximum stored
            energy is not at the maximum current. What current should be used?

    -       A dc electric motor comprises inductance and capacitance which vary
            according to rotor position. The motor can also behave as an generator. How
            should such a motor be tested?

    -       What criteria are used to decide whether a guard for a light-transmitting part
            should be removed for the impact test?

 22.4.7     Does a hard setting resin sealed cable entry have to be subjected to the
            requirements of 22.4.7?

    -       Is the stored energy limit for simple apparatus to be calculated from internal
            voltages and currents or external supplies?

    -       Temperature measurements on very small components, eg pots, may often
            change the thermal resistance dramatically if the component is disassembled.
            Can fine-wire thermocouples inserted through strategically drilled holes be
EN 50 039   Are the parameters for Simple Apparatus in an IS system to be calculated
            under normal and fault conditions of the system or the simple apparatus itself?

    -       Are there any acceptable methods for sealing cables entering Ex m apparatus
            in addition to the example in the standard (5mm of bare conductor)?

    -       Is it possible to certify Ex m apparatus if it is only suitable for a supply with a
            prospective less than 4000A? If so what supply parameters are used for the
            temperature classification and what certificate conditions are required?

   D1       How is an overall dilution area to be defined when there are multiple

   D1       How is the concept of dilution area to be considered when a flame ionization
            detector is used?

 Table 4    Can IP54 enclosure be used like coating or encapsulation to allow reduction of
            physical separations?
    -       Shunt voltage limiting diodes (or other safety components) may be bypassed
            by a combination of internal earth fault and an external wiring fault. Do such
            combinations of faults need to be considered?

    -       Should batteries be disassembled to allow determination of internal
             What are the criteria for them being "sealed"?
            Is a manufacture's statement of CTI acceptable?
EN 50 014   Does portable IS apparatus have to be drop tested at low and high ambient

    -       If the manufacturer requests dual certification (ie two protection concepts) are
            there any special considerations dual i & N marking/certification? ( See HOTL
            48.04 )

    -       How is the release of gas from a flame ionization detector to be considered in
            relation to the Ex d enclosure housing the detector?

    -       Under what conditions should a flame ionization detector be temperature

    -       What certification coding is appropriate to flameproof apparatus containing a
            flame ionization detector?

   8.2      A flameproof sensor whose body comprises hexagonal flats like a nut and a
EN 50 014   threaded portion greater than M16 is to be screwed into a flameproof
            enclosure. Is additional securing like a locking screw required?

            How is the safety factor to be achieved in a series spark test of a dc motor?
            Vs and Rs are supply, Rm and Lm are motor.

            How is the safety factor to be achieved in a shunt spark test of a dc motor? Vs
            and Rs are supply, Rm and Lm are motor.

            To where on the line do we read the ignition curves?

            Can the separation of a flameproof plug and socket be prevented by a
            setscrew which has to be loosened to allow separation? A special tool is
           Resistance to light test is not done for parts inside another enclosure. How are
           parts in an enclosure with a window to be considered?

   -       Clause 8 gives 3 examples of infallible pairs of connections (2 tracks or 2 wires
           or 2 connections). Can a pair comprising one from 2 examples (eg 1 track and
           1 wire) be considered infallible also?

   8       In relation to ST&C 67 can two parallel connections in a plug/socket
           arrangement be considered infallible?   Is epoxy resin to be regarded as a "plastic" and, consequently, are the 20000h   temperature index and thermal endurance testing required?

Table 1    Some corrosion probes work by measuring the resistance of a "wire", which
           corrodes at the same rate as the pipe. How is this temperature classified?

           Can a conductive coating be used on plastic enclosures to negate the necessity
           for a static warning label

           Is it possible to specify an enclosure type loosely so that the size, material, and
           shape may alter, without re-submittal to he certification body

           Can the duty cycle be used during the determination of the temperature rise of
           a piece of apparatus.

           Can intrinsically-safe systems be specified with entity parameters, or is more
           information required?

           Can batteries be used inside Ex p enclosures?

Table 1    Can Table 1 be used to determine the temperature classification of wires other
           than copper?

           Integrated circuits with glass windows are not fully encapsulated but are
           sealed. How is the temperature rise of these items considered?
     5        Is the distortion of cells in Ex i equipment allowed.

  Scope       Can the protection against dust for a plug and socket required by 5.5.3 be
              provided for by a label and a 'X'condition

              Can the requirements of BS 6941 be waived in a similar manner to the tests?

              Are cements considered as plastic materials for the purposes of this standard?

              If a plastic enclosure is not subject to daylight once installed is it permissible to
              add a special condition to the certificate and waive the requirement for the
              resistance to light tests?

              Can equipment certified to the 2nd editions of the standards bear the
              distinctive community mark?

              Can apparatus certified against the 1st editions bear the CE marking?

2.8, 9.1.2,   Is a liquid below it's flashpoint allowed to be used in an Ex p enclosure?

              How do we treat capacitive re-inforcement in circuits

              Are ceramic cements subjected to the tests in clause 23.4.7?

              No interpretations yet. Standard only in draft.

              No interpretations yet
           ROUTINE TEST: The statement "for enclosures here pressure menasurements
           is impractical, exceptions from routine pressure testing should not
           apply"(para2) causes practical problems for small enclosure manufacturers.

           Clause 8.6 allows creepage and clearance requirements to be waived if,
           amongst other criteria,the voltage at any point in the equipment does not
           exceed 60Vac or 75Vdc.Sinewave(84.85 V peak). Is a non sinusoidal waveform
           acceptable of peak below 84.85V
           Can the power disipations allowed for T4 be extended to cover ambient
           temperatures above 80 deg C

EN50014    In battery powered equipmet can the requirement for tmperature rise testing   at 110% of the supply voltage be waived and the testing performed at the
           voltage prescribed by EN 50020 1994 table 5

10.9.3     3.9V Lithium batteries comprise of more than one cell in parallel (1)Does this
           type of construction comply with EN 50020 1994 7.4.1 and (2) does the above
           fall into the category defined in EN 50020 1994 10.9.3

           Can the method of interconnecting "D" cells as described ( see Diagram) , be
           considered as non sparking either by assessment or testing

           Clause states that "All components of a powder spray or flock spry gun shall
           comply with the requirements of temperature class T6". The apparatue fails to
           achieve T6 in still air. Can the apparaus be tested with air passing over the
           H/Sink as designed.
           Battery pack with multiple batteries and current limiting resistor enclosed in
           plastic shrink wrap per 7.4.6. Does battery pack have to comply with 7.4.9 ?

           Can battery with thermal/mechanical/chemical current limiting methods be
           permitted for testing without current limiting being removed as it is not in

           Can 400cm2 area of plastic be used as prescribed by this clause except that
           the keypad has earthed backing plate as opposed to "Exposed area
           surrounded by a conductive earthed frame" (IIB)

           If an area has two separate areas of unprotected plastic. eg. display & keypad
           each not greater than 100cm2. Is this acceptable or is the clause permitting
           only 100cm2 in total

           Is a metal plate, backing a membrane ketpad, aceptable as being adequate for
           compliance with the HOTL ruling on static See attached sheet
Clause requires motors to be tested as a unit in association with the converter
specified. Can and engineering judgement be made on permitting the less
onerous drive to be included in the certification

Can a guarateed depth of greater than 0.4mm of conformal coating be
accepted as encapsulated ? If the depth of insulating material can be
guaranteed to be greater than 0.4mm above any conductor, then this may be
accepted.The encapsulant must be defined
HOTL decision 31.02 states that `A` certified components may be used in `B`
certified apparatus (Standard Inter No 6 refers). Can `C` certified components
be used in `D` certified apparatus

Can a test height of 1 metre be used (similar requirements are specified in EN
50014:1992 Clause Drop Test) to demonstrate that the fuel cut-off
valve operates when the nozzle is dropped, to simulate it falling out of a
vehicles filling pipe.
Should the fuel in the pipeline remain pressurized when the safety break
operates as this represents a more problematic situation (Maximum discharge
of fuel). The standard does not specify whether the fuel in the pipe is under
pressure or not
Can EXXSOL D80 be used as a test fuel because the standard does not specify

Does line 6 of table 4 apply to creapage distances underneath or inside
conformally coated components refer to attached drawing. Proposed that line 6
still applies as the component in the drawing is sealed from the ingress of
moisture or contamination.
Can Labyrinth joints which are allowed in clause 8 of EN 50018 : 1994 for
shafts be used for other applications such as normal joints (refer to Figs 1 & 2
attached) for pressure transducers and cable gland assemblies?

Can diaphragms be used in flameproof enclosures

What should the segregation distances be between the live and neutral lines of
a circuit in associated electrical apparatus on the unfused side of the circuit.
Does clause 7.3 (para 5) apply to the none component side of the PCB. ( See
attached diagram).
Can the securing and release of a threaded flameproof cover tightened to a
specific torque by means of a special tool, be considered as complying with
clause 11.10 of EN 50018:1995 without a separate fastening arrangement.

1. Does this clause to prevent a sample of the material to be tested for surface
resistance with the parallel tramlines already painted on the material. 2. Is the
test piece allowed to be conditioned at less than 45% RH (but not exceeding
55% )
Does the standard permit ambient temperatures lower than + 40 deg C. eg
+30deg C and hotter than -20 deg C eg 0 deg C provided there is an X mark
or its put on the label

In order to simplify methods of temperature assesment for group I the
following two questions are raised

See standard interpretation query 164 - Use of labyrinths

What areas within a flameproof enclosure must satisfy the requirements of
clause 11.6 of EN 50018:1994

Is it permitted to determine the maximum internal temp of the potting
compound under normal operatiing conditions and use this value to define 1.
The required continuous operating temperature of the potting. 2. the required
temperature for thermal cond
The ATEX marking is too large to fit on small products and components such
as gland adapters and stopping plugs.

See attachements

In the UK "braided" cable is used as flexible wire armoured rather than for
screening alone(in German"braided = screened). When a cable gland is
designed to clamp braided cabled by means of the armoured clamp thather
than the sealing ring or compound, which tests are applicable- armoured as
B3.32 or un - armoured as B3.1?
See comments

Does the use of a manufacturere label/sticker manufactured from a plastic
material when attached to an enclosure wall, constitute a static hazard. And
therefore require a means of protection/warning label.

Respiration systems whih consit of plastic enlosurs ans blower units passing air
throuh tubes and ducts also constructed from plasic materials; have previously
been certified for use in hazardous locations. Such sertification has occurred
whilst HOTL decision 48 -01 was in fource, therefore can similar products be
exempted? that Ex Cable entries should be certified as apparatus
3.15 states
5.1.2 states that apparatus must be marked with a T-class
Ex Cable Entries do not generate any heat and would therefore automatically
obtain a T6 T-Class. However, these may be fitted to any appropriate
equipment where the T-Class could be T1, which could lead to confusion.
           On the basis of Plastics materials being listed to U746C" Dec27 1995 Polymeric
           Materials - Electrical Equipment Evalualtions" is this sufficient justification to
           waive testing to EN 50014:1992 clause

           How are the risks due to electrostatic discahrges addressed with respect to
           non - metalic labels

           The temperature Index (TI) test is based on HD611.1.S1 and is a test of
           changes of flexural strength over time or alternativelytensile strength over
           time. For materials designed to flex or where material is mounted such tht
           there is no possiblity of flexing, stress or strain then the test is the relvant?
           The test application obscure one and - adesive laminate ro non-coated PCB be
           Can the is a rather of a suitable self few plastics manufactures have the test
           considered as the equivalent of coating the section of the board by the
           laminate, thus allowing line 6 of Table 4 the be used rather than line 5?

           Our procedures state that the manufacturer must specify the aggressive
           substances that the products are likely to come into contact with. The problem
           with this approach is that it is not usually known what aggreisve substances
           the user is going to have, that will come into contact with the equipment. Is
           the following approachbatteries are short curcuit tested in accordance with
           Ten sample of cells or an acceptable alternative? PJW
           10.9.1 to conduct maximum surface tenmperature tests in accordance wuith
           clause 10.9.3(b). Some cells or batteries are not designed to withstand a
           continuous short circuit, though they do not have a specific safety device, can
           become open requires to usefullzener diode Are thecloser tolerence than is
           If a customer circuit prior tp a discharge. with a rsults of temperature rise
           normally available, sometimes the zener diode manufacturer has a close
           tolerence selection process fer an extra cost. Unfortunately this is not always
           available. Can the customer implement his own selection process to achieve
           tighter tolerences. testing flameproof enclosures below the normal ambient
           Reference pressure
           range of -20C to +40C. Historically all flameproof enclosures were tested in a
           freezer at the respective lower temperature and the pressure was monitored
           using the conventional pressure transducer methods. Over the past few years
           testing has notto perform a test andopto CANMET temperature verses pressure
           Is it permitted been conducted on the - isolators to demonstrate that the
           application of mains to the non-hazardous side of the opto does not invalidate
           the segrigation? (DH)

           Clause 6.1 of EN 50018:1994 requires that cemented joints that do not fulfil
           thr requirements of clause 5 shall be subject to the test requirements of clause
  and in EN 50014:1992. In the past those tests in EN
           50014:1992 have been waved when the cementing compound is ceramic
           Niether standard listed above assesses the Is it correct to or cells
           based as the tests are for plastic materials. use of batterieswave thein purge
           enclosures. Technical interpretation No 130 Quotes "can batteries be used
           inside Exp enclosures?" The result of this was "cells can be used in the present
           standard provised they don`t gas in normal charge/discharge acording to the
 HOTL      cell/battery manufacturer, as such would introduce flammable into the
decision   According to the latest ExnB documents, HOTL decision 48.01 has been
 48.01     retained for clarity.
           There are rather crucial words included that are clearly contradictory to
           standards that have since been reviewed by the Technical Committee and
A cuircuit contains a 6.6 V battery supply and is intended to be segregated
from a second circuit containing 3 electromechanical gas sensitive cells, each
having a maximumm voltage of 1.2 V. is it permissable to discount one of the
voltages, since it is less than 20% of the battery volyage. PJW
If a plastic enclosure which complies with EN 50014: 1997 Clause is
painted, do the requirements of this clause apply to the surface of the paint
finish? DS

Can a plastic enclosure which complies with EN 50014: 1997 Clause
be considered a substitute for the metal enclosure considered by the report
included with Query No 182?

Can positive temperature coefficient (PTC) resistors be considered as safety
components, for use in
Ex ib circuits only (2 connected in series)?
The points needing consideration are:
i) Does the device react quickly enough to prevent incendive levelscharges on
The two standards/clauses referenced above covered electrostatic of energy
enclosures of plastics materials.

One of the methods described that is acceptable for compliance with the
clauses is by virtue of the name and address of the manufacturer appears on
The requirement that size, shape and layout….etc.
the equipment leads to the conclusion that the issue of trade agent certficate
is not possible. This is where the manuafacturers name or mark under the old
approach was replaced by that of a trade agent (distributor) followed by in A in
a circle.4.6.1 calls been common pratice for of windings to comply with either
Clause This has for insulated conductors years but is complicated by ATEX
clause Conductors covered with two layers of insulation OR Clause Enamelled winding wires.
For clause there is no definition of two layers of insulation or
specification of IEC on which insulationand at what temperatures should an
How many impacts Grade of samples DS
enclosure manufactured from plastic material be subjected to (Group II
applications)? RWJ

Instrumentation to be certified as Type n is usually basically non-sparking with
certain components such as potentiometers and dip-switches, which are
assessed as energy-limited under clause 21.
Q1: What certification code is applicable: EEx nA, EEx nL or EEx nAL?
Q2: When is were 21.3 (cable parameters) test report 99/0433 to
Pellistor testsclause carried out as detailed in to be applied?
demonstrate that a pellistor cannot ignite methane under two sets of
conditions: (1) a current just below the fusing current is passed until thermal
equilibrium is atained and (2) a current above the fusing current is passed,
causing the pellistor to fail open circuit. fitted with a guard (other than
1. Equipment with light transmitting parts
luminaires) are permitted a reduced impact energy but the requirements of the
guard are not defined. What constitutes a guard under the terms of this
clause and how is the test to be conducted? (DS)
A Clause shaft with treaded ends is used to secure a The mesh cover. The
2. rotating21.1 permits luminaires fitted with a guard. flameproofsize is given
fastener/shaft passes through the enclosure wall, thus forming flamepaths,
and is secured in place by a nut at either end, reference figure 1.
1. Does the security of the fastener need to com;py with clause 11.5?
PrEN 50284 permits the application of two independent standardised types of
protection to be used to increase the Category rating of equipment from Cat 2
to Cat 1, but there is no equivalent to permit the same methodology to
increase Category 3 equipment to Category 2.
EN 60598-2-5 Clause 5.12.1 (standard for floodlight luninaires) permits 10K to
be deducted from measured temperatures on test to allow for natural air
movement when fitting is installed outside. this 10K allowance only applies to
maximum service temperature of windings. The allowance is not included in
thermal testing in EN 50019.
Spade type connectors are not a connection method included in EN 50019,
however these are one of the connection types being considered by TC31
WG12 for inclusion in this standard. The author of this document
interpretation has the responsibility for producing requirements for spade type
connectors: and internal separable has been submitted by Epsilon Technical
PROBLEM The following maerial connections.Identical type connectors have
Services and is used in purge application as illustrated on attached sheet.
MATERAL : DUPONT - Melinex *Sample attached, Aluminium Coated Foil)
QUESTION: Do we consider this material to be non-metallic or metallic.
Reference UL Plastics book 174-5 & be applied in lieu of the 1500V rms for 1
Can a 3750 V rms test for 1 second 180
min (SCF)

This clause requires clearances between rotating parts to meet certain
dimensions. It is accepted that the parts referred to are items such as pump
shafts, motor shafts, exposed gearbox coponents etc. However, on forklift
trucks there are normally large chains and numbers of guide wheels (bobbins),
This clause requires that ancillary an oil film but the standard for such (Type
chains etc, are designed to run in electrical equipment 2 is certified to the
latest editions of the concept standards.
1. Does ths equipment need to be individually ATEX certified
2. If the concept standards are updated, is equipment certified to these
This caluse relates not permitted
updated standards to Cat 3 (zone 2) trucks and requires electrical equipment
to meet EN 50021 (ExN) . Is equipment to other concepts acceptable? (SJO)

How should a protective system such as a Flame Arrestor be marked? And
what is the appropriate conformity assessment procedure? (RC)

Is is necessary to conduct a overpressure test upon every enclosure
manufactured using welded construction ?

EN 1834;1999 is not on the Sira UKAS scope and a number of enquiries have
been received requiring its use (SJO)

prEN 12874;2000 is not on the Sira UKAS scope and a number of enquiries
have been received requiring its use (SJO)
EN 50281-1-1 provides requirements for electrical apparatus that is protected
by enclosure for use in areas where combustible dust may be present.
If equipment is also being assessed against gas hazard protection standards
(e.g. EN 50014 series or EN 50021) and the client has requested an ATEX code
that incudes dust protection, can an assessment be made against EN 50281-1-
1 to determine compliance with the ATEX Directive? (DS)
What additional safety assessment is required to permit hazardous area
apparatus to be located in an area of increased ambient pressure above the
1.1 Bar permitted by the ATEX Directice, 94/9/EC. BJA
1) Can the spark ignition data in the IEE paper by A L Bartels and J A Howes
of ERA Technology, entitled „The variation of minimum igniting currents with
pressure, temperature and oxygen enrichment‟ be used for the assessment
apparatus in increased ambient conditions, thus satisfying the requirements of
the ATEX Directive?
2) In the above mentioned paper the relationship between spark ignition label
EN 50014: 1997 Clause 7.3.2 last paragraph permits the use of a warning
(e.g. Clean Only With A Damp Cloth) if the danger of ignition from plastic
enclosures cannot be avoided. EN 50281-1-1 does not allow a warning label to
be fitted in place of compliance with the anti-static requirements.(DS)
prEN 13617-1:2001 is not on the Sira UKAS Scope and a number of enquiries
have been received requireing its use(SJO)

EN 1755 is not in the Sira UKAS Scope (SJO)

Raised in error. Standard already appears on schedule of accreditation 30

A plastic microswitch requires protection from impact, resistance to light and
dust. If this microswitch is fitted into a plastic enclosure does this enclosure
need to be subjected the assessments and tests detailed in EN 500 series of
Themal rise tests are often conducted with thermal trip devices installed within
the test sample. How do we ensure that:

a) The devices installed for testing are identical in type and manufacture to the
devices installed in production versions.
The group I category M1 standard EN 50303:2000 is not in our UKAS schedule
of accreditiation and is needed in our accreditation to permit the issue of a

The UKAS Schedule does not list this standard (DRS)

When using the above standard for EEx n (EN 50021: 1999, Gas Zone 2, Dust
Zone 22) luminaires, the above clause requires" the light transmitting cover" to
pass the impact test of EN 50014> 1977: Clause
Therefore there is a contradiction between the (high) impact levels, for the
light transmitting parts (without guards), of EN 50021: 1999 Clause of
In the above standard there is a total ban on having any plastic enclosure
greater than 100 sq. cm in area (or 400 sq. cm if earthed metal frame is
used). Additionally, the resistivity requirements are also to be met on this small
In the technically equivalent IEC Standard IEC 61241-1-1: 1999: Clause
It has been established that there can be areas, in mines susceptible to
firedamp, where only a coal dust hazard exists (refer to attached letter from
HMIM). The ATEX Directive also recognises that a mining installation may only
have a combustible dust hazard:
Annex 6.4.7 of 1. 50020:1994
Clause 1 Clause EN (b) para 2 suggests that the insulating material used for
PCBs is to be tested to IEC112 to determine its comparative tracking index
(CTI) value.
We no longer have the facility to carry out CTI testing. (BJA)
Can UV weathering data obtained though testing to the US automotive
standard SAE J 1960 be used to waive testing to ISO4892 part 2 (as defined
by EN 50014:1997 clause

Pressure testing o compound filled cable glands.
The pressure test requires that 'metallic' mandrels are use for the test.
However, the thermal conditioning test from EN 50014 need to be applied to
the assembly prior to test. When this is done the metallic mandril expands and
contracts causing it to break away from the compound which is required to be
The UKAS Schedule does not list this standard (DS)

The UKAS Schedule does not list this standard (DS)

The UKAS Schedule does not list this standard (DS)

Standard not listed on the UKAS Scope (RD)

Standard not listed on the UKAS Scope (RD)

Standard not listed on the UKAS Scope (RD)

The UkAS Schedule does not include this standard (DS)
The inner thread on an Ex thread adapter must be metric. This greatly limits
the range of adapters a manufacturer may place on the market.(AS)

St&C Ltd has generally considered the Weidmuller SAK 2.5 EEx e II terminal as
representing the „worst case‟ terminal with regard to maximum temperature
rise inside Ex e Junction Boxes. On this basis junction boxes have been
certified with maximum power dissipation listed on the certificate allowing any
number of EEx e II certified terminals (within the certificate limits) has
This is not a problem as such but a technical decision. A customer to be fitted
requested whether soldering/brazing is allowed for sinter retention (reference
Figures 1 and 2). With reference to EN 50018:2000 clause 10.7, “The
breathing and draing device elements shall be sintered, or fixed by other
suitable methods”.does not list this standard.(JEL)
Sira‟s UKAS scope Soldering /brazing can be considered to be a suitable

Walsall Limited propose to use a polycarbonate guard (cover), non-metallic,
over a wellglass. This arrangement does not form a flamepath and is an
additional external enclosure wall. The guard/cover is relied upon for
resistance to impact in accordance with EN 50014:1997, for example it
protects the wellglass. upgrading an is, what tests does the guard/cover need
Whilst transferring and The problem EECS (BASEEFA) Trace Heating Tape
certificate, I noticed that we do not have the above standard included in our
UKAS scope. (DH)

prEN 13012:2001 is not on the Sira UKAS Scope (SJO)

The UKAS schedule of accreditation does not list the standard (SCF)

For oil filled equipment (eg. Transformers), it is common for the terminals
under oil to be closer than the „through air‟ creepage and clearance
requirements of Table 7. It is therefore not possible for the equipment to be
Category 3 to Exn (SJO)
Directive 94/9/EC specifically excludes PPE covered by directive 89/686/EEC
from its scope. However, some PPE is specifically intended for use in
potentially explosive atmospheres.
What conformity assessment procedures should be followed for PPE intended
for use in potentially explosive atmospheres? And how Ex q enclosure with a
The product under assessment is constructed from an should the PPE be
containment system running through the middle, as illustrated in Figure 1.
The minimum distance through the filling material between electrically
conducting parts of the apparatus and insulated components on the one hand,
and the inner surface ofour UKAS Accreditation Schedule.(DRS)conform to table
This standard is not on the enclosure on the other hand shall
              The UKAS Schedule does not include these standards (DRS)

              Automotive LPG dispensers have no published EN or National Standard. This
              committee document represents the latest technical knowledge for this

              This standard is not included on our UKAS Accreditation scope.(DRS)

              The UKAS scope does not include these standards (DRS)

              How to show that intrinsically safe apparatus for use in dust atmospheres
              meets the requirements of the ATEX directive. (RWJ)

    ALL       prEN 14678-1 for LPG forecourt dispensers is not on the Sira schedule
              although the earlier. (SJO)

      EN       EN 50281-1-1-specifies thr maximum surface temperature marking of the
 50014:1997 enclosure T`….. Shall be linearly corrected to 40 deg C ambient……`
  (A1 & A2)
Cl /3 EN 50014:1997 specifies the temperature class, or temperature (in deg C)
               marked strength testing of large '….shall be corrected for the maximum for 60
               Electric on elactrical apparatus, numbers of encapsulated solenoid coils
               seconds (each coil) makes them commercially unviable. (DH)

              Minimum marking requirements are not clearly identified and there is
              contradiction between:
              - some standards that include reduced marking details for small items
              - others standards that don‟t include reduced marking details for small items
              The UKAS schedule does not list EN 60079-25:2004 (IEC11
              - Directive Guidelines 94/9/EC issued May 2000 Chapter 60079-25:2003). The
              existing Sytem Standard , EN 50039:1980 has been superseded by EN 600079-
              25 :2004. EN50039:1980 is to be withdrawn no later than 1st December 2006
              The UKAS Schedule does not list this standard (TD)

              The UKAS Schedule does not list this standard (TD)
Pr EN 13617-2 (fuel dispencser safe breaks ) is not in the Sira UKAS Scope

The UKAS schedule does not list EN 50394-1:2004 (BS EN 50394-1:2004).(IH)

Para 4 of the above specifies the requirements for bushings that allow the
passage of conductors through a partition wall. In order to prevent a build up
of flammable gas in the enclosure containing the electrical circuits, it requires
that the leakage rate through the bushing must be low compared to that from
the electrical enclosure to the free atmosphere. powder paints and flock and
These clauses cover spray guns for liquid paints,
are basically the same in that:
Any electrical apparatus or part of electrical apparatus… including the outer
enclosure of the gun, with the exception of the components in the high voltage
circuit, shall comply with one or more of the types of protection listed in EN
This standard is not on our UKAS Accreditation Schedule.(TD)

This standard is not on our UKAS Scope (SCF)

This standard is not on our UKAS Scope (SCF)

This standard is not on our UKAS Scope (DH)

This standard is not on our UKAS Scope (PR)

This standard is not on our UKAS Scope (PR)

Clarification of marking for associated apparatus is required. Can the letter G
(gas) and D (dust) be applied (SCF)

Clarification of impact testing for plastic samples is required(SCF)
           Are flexible walls acceptable as parts of flameproof enclosures? (SCF)

EN 50018   Clarification of the requirements for plasic flameproof parts is required (SCF)

           Clarification of temperature rise testing on flameproof motors is required (SCF)

           To what extent can separation rely on insulation of component bodies? (SCF)

           How shall multiple separation distances interposed by conductive parts be

           How shall equipment that may also be Exd or Ex I be marked ? (SCF)

EN 50019   Do Exi terminals in Exe junction boxes require marking as Ex ia or Ex ib

           How shall a fully internal voltage source of an integrated circuit be taken into
           account? (SCF)

           Clarification of the requirements for plasic flameproof containing gas analysis
           equipment is required (SCF)

           What measures should a notified body take concerning the exmination of
           instructions? (SCF)

           The UKAS schedule does not list BS 7202:1989

           The standards EN 61241-18 & IEC 61421-18 are not on the UKAS scope
      This standard is not on our UKAS Scope

      This standard is not on our UKAS Scope

All   The Intrinsically Safe (IS) dust standard IEC 61241-11:2004 is not on the UKAS
      Scope. It's status is a CDV abd therefore not yet a PR standard, but it is the
      only IS dust standard available and has been used by other test houses in
All   The UKAS Schedule does not list this standard.



      Type nL equipment, typically a simple switch with contacts supplied by an
      energy limited circuit compliant with 30.2 of EN 60079-15:2005
      EN 60079-15:2005, table 1, 26.4.2, 26.7 would indicate that impact testing and
      thermal endurance testing to EN 60079-0 is required on the switch. This is
      incorrect as the actual switch list IEC 60241-11:2005safe 1 (AED)
      The UKAS schedule does not body does “not affect Ed operation” [1] of the

      Pr EN 13617-1 has now been issed as EN13617-1:2004 and is not on the Sira
      schedule (SJO)

      IEC 61241-0 provides the clamping requirements for cable glands in clause
      27.1. These requirements would appear to have been taken from IEC 60079-
      0:2004. In doing so it would appear that the relaxation of clamping test load
      values to 25%, in cases of fixed installations when the cable is clamped
      externally, has not is not carried Sira Schedule of accreditation The draft
      EN 14678-1 :2006 been on the over to IEC 61241-0. This leads to
      prEN14678-1 is.(AS)

      The number of impacts per sample, on plastic enclosures, is open to
prEN 13617-2 :2003 is on the Sira Schedule of Accreditation . EN 13617-2 is
not (AS)

Define how the thermal endurance temperatures are calculated, relating to an
Exd potted gas detector head with sinter.

Particularly relating to gas detectors that have cement around the edge of the
sinter element, not on the in the base Accreditation(AS)
The Standard isand potting Schedule of for the pin connections.

EN 16617-4 is not on the Sira Scope(SJO)

Type n sensors are to be used on an engine. Having thermally conditioned the
plastic enclosure and associated connectors, these subsequently failed the cold
impact test. It is unlikely that the customer can change the material or the
ambient temperature range to solve this problem.(AT)
The Standard is not on the Schedule of Accreditation(AS)

Can a multi-turn spring ring (or multiple spring rings) stacked into a housing
be regarded as a breather drainer in an „Ex d‟ enclosure?

The clause reads 'Where the 'm' apparatus is not able to withstand a single
fault for level of protection 'mb' or two faults for level of protection 'ma'
without exceeding the COT of the encapsulation or the temperature class, then
a protective device shall be provid3ed either external to the apparatus or
directly integrated into the apparatus. The clause Group II that temperature
Materials used in the construction of enclosures of suggests electrical
equipment for the identified equipment protection levels shall not contain, by
mass, more than :- 7.5% magnesium and titanium for EPL Gb applications. Is
it permitted to mark the equipment with an X and detail the conditions of use if
these limits are exceeded. changes with respect to the previous edition are
FOREWORD: The significant
listed below:
- introduction of level of protection “ic” (this level of protection has been
introduced to allow removal of the „energy limitation‟ concept from 60079-15);
A client wishes to certify 2-step adapters. Examples: M20 male to M32 Female;
M25 male to M40 female and equivalent sizes, How shall we quantify that the
design length and volume in each case is minimal according to good
engineering practice in accordance with the standard's clause. I believe the
intent of the standard is not to increase the overall volume of the associated
              EN 13616 (petrol tank and overfill prevention valves Type A) is not on the
              UKAS scope.

              The clause covers impellers. It requires the impellers to be able to withstand a
              test run at a minium of 1.15 times the maximum operational rotating speed for
              at least 60 seconds without causing an ignition risk, i.e. the impeller shall not
              contact the casing. The standard does not detail a test to prove this so what is
              the clause states “Impellers shall be of a rigid design”. The term rigid design
              The pass/ fail criteria
              is open to interpretation. In the case of a fan with variable pitch blades, is it
              possible to consider the impellers as rigid?
              The clause goes on to say “a continuously welded fabricated impeller or a cast
              moulded impeller, both having all elements of appropriate thickness and

              This standard is not on the Sira Schedule of Accreditation

              This standard is not on the Sira Schedule of Accreditation

              This standard is not on the Sira Schedule of Accreditation

              This standard is not on the Sira Schedule of Accreditation

              This standard is not on the Sira Schedule of Accreditation

              This standard is not on the Sira Schedule of Accreditation

              Testing of a T5 Compact fluorescent lamp is not included in the standard
n allocated
Testing of a cable entry device interface seal is ambiguous with respect to
thermal endurance of the enclosure interface seal and IP rating.

Schurter fuse rating

Comparison if Isc between these standards.

Problem with units in Tables 2, 3 and 6

The black panel temperature has been raised from 55 deg C to 65 deg C

This standard is not on our scope of accreditation

To top