title24_part03_page0230.pdf

							326.1                              ARTICLE 326 - INTEGRATED GAS SPACER CABLE: TYPE IGS



                ARTICLE 326                                      326.80 Ampacity. The ampacity of Type IGS cable shall (
                                                                 not exceed the values shown in Table 32Q.80.
    Integrated Gas Spacer Cable: Type IGS
                                                                 Table 326.80 Ainpacityof Type IGS Cable
I. General
                                                                                                                      Am eres
326.1 Scope. This article covers the use, installation, and                                                             376            /

construction specifications for integrated gas spacer cable,                                                            412
Type IGS.                                                                                                               429
                                                                                                                        445
326.2 Definition.                                                                                                       461
Integrated Gas Spacer Cable, Type IGS. A factory                                                                        476
assembly of one or more conductors, each individually                                                                   491
insulated and enclosed in a loose fit, nonmytallic flexible                                                             505
                                                                                                                        519
conduit as an integrated gas spacer cable rated 0 through
600 volts.


II. Installation                                                 III. Construction Specifications
326.10 Uses Permitted. Type IGS cable shall be permitted         326.104 C~nductors. The conductors shall be solid
for use under ground; including direct burial in the earth, as   aluminum rods, laid parallel, yonsistiI).g, of one to nineteen
the following:                                                   12.7 mm (Yz in.) diameter rods. The minimum conductor
                                                                 size shall be 250 kcmil, and the maximum size shall be
(1) Service-entrance conductors                                  4750 kcmil.
(2) Feeder or branch-circuit conductors                          326.112 Insulation. The insulation shall be dry kraft paper
326~12  Uses Not Permitted. Type IGS cable sball not be          tapes and a pressurized sulfur hexafluoride gas (SF6), both
used as interior wiring or be exposed in contact with            approved for electrical use. The nominal gas pressure shall
buildings.                                                       be 138 kPa gauge (20 pounds per square inch gauge). The
                                                                                                                              \,
326.24 Bending Radius. Where the coilable nonmetallic            thickness of the paper spacer shall be as specified in Table
conduit and cable is bent for installation purposes or is        326.112.
flexed or bent dUring shipment or installation, the radii of
bends measured to' the inside of the' bend shall not be less
than specified in Table 326.24.                                  Table 326.112 Paper Spacer Thickness
                                                                                                      Thickness
                                                                     SiZe (kcmil)             mm                      in.
Table 326.24 Minimum Radii of Bends                                   250-1000                1.02                   0.040
           Conduit Size                    Minimum Radii              1250-4750               1.52                   0.060
 Metric Designator    Trade Size          mm         in.
         53               2               600        24          326.116 Conduit. The conduit shall be a medium density
        78                3               900        35
        103               4               1150       45          polyethylene identified as suitable for use with natural gas
                                                                 rated pipe in metric designator 53,78, or 10~ (trade size 2,
                                                                 3, or 4). The percent fill dimensions for the conduit are
326.26 Bends. A run of Type IGS cable between pull               shown in Table 326.116.
boxes or terminations shall not contain more than the
                                                                      The size of the conduit permitted f6r each conductor
equivalent of four quarter bends (360 degrees total),
                                                                 size shall be calculated for a percent fill not to exceed those
including those bends located immediately at the pull box
                                                                 found in Table 1, Chapter 9.
or terminations.                        .
                                                                 326.1~0 Marking.      The cable shall be marked in
326.40 Fittings. Terminations and splices for Type IGS
                                                                 accordance with 310.11(A), 310.11(B)(I), and 310.11(D).
cable shall be identified as a type that is suitable for
maintaining the gas pressure within the conduit. A valve
and cap shall be provided for each length of the cable and
conduit to check the gas pressure or to inject gas into the
conduit.




70-174                                                                                               2007 California Electrical Code