Survey on Low Voltage Rationalization

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					      SURVEY ON LOW VOLTAGE RATIONALIZATION

1. BACKGROUND


A national committee, Working Group on Voltage & Frequency, has been formed, with SIRIM
Berhad as the secretariat, to review Malaysian Standard, MS406:1996, Specification for
voltages and frequency for alternating current transmission and distribution systems
(Second Revision). The highlights of the initial findings are as follows:
    At present, voltage provided by the utility is at 240V/415V with a band of +5% and -10%.
     In view of the fact that electrical appliances and equipment are converging to a voltage
     rating of 230V/400V worldwide, it is necessary to review the present supply voltage of
     240V/415V.




2. PROPOSAL


IEC 60038:2002 stipulates that ‘The electricity supply authorities of countries having
220/380V systems should bring the voltage within the range 230/400V +6 %, –10 % and
those of countries having 240/415 V systems should bring the voltage within the range
230/400V +10%, –6%. The transition period should be as short as possible and should
not exceed the year 2003. At the end of this transition period, the tolerance of
230/400V±10% should have been achieved; after this the reduction of this range will
be considered’.


However, to prevent detrimental effects on the ride-through capabilities of existing sensitive
equipments, it is therefore proposed that the new supply voltage be stipulated at 230V/400V
with a band of +10% -6%. This is a modification to the recommended voltage in IEC
60038:2002. The band is selected with the understanding that the present 240V/415V
system, which has tolerances of +5% and –10%, will fit into the new requirements, such as
indicated in the following table:


    System      1-         3-        Limits            1-phase                 3-phase
              phase      phase                      Min         Max         Min       Max
Proposed      230V       400V       +10% -6%       216V        253V         376V      440V
Present       240V       415V       +5%, –10%      216V        252V         374V      436V


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The adoption of 230V/400V at +10% -6% will therefore not affect the operation of any
existing installations and the equipment or appliances supplied by them. The utility is
expected to operate under the present requirements, but will later be expected to operate
under the new 230V/400V system with a tighter allowance on voltage variation.




3. FEEDBACK FROM INDUSTRIES
We need your feedback on the proposal for the committee to make a wise recommendation
in the development of a Malaysian Standard.


Please tick one of the following:


                We AGREE with the 230V/400V system (+10% -6%)


                We DISAGREE with the 230V/400V system (+10% -6%)


Please specify your reasons, or give any comments that you may have on this subject:
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Name                    : ___________________________________
Designation             : ___________________________________
Company                 : ___________________________________
Address                 : ___________________________________
Telephone / Fax         : ___________________________________
Email                   : ___________________________________            Company Stamp




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posted:7/18/2011
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