2.1.3.3
Stranding
Conductor stranding classes cited herein shall be as defined in NEMA WC 70,
as applicable. Lighting conductors No. 10 AWG and smaller shall be solid
or have Class B stranding. Any conductors used between stationary and
moving devices, such as hinged doors or panels, shall have Class H or K
stranding. All other conductors shall have Class B or C stranding, except
that conductors shown on the drawings, or in the schedule, as No. 12 AWG
may be 19 strands of No. 25 AWG, and conductors shown as No. 10 AWG may be
19 strands of No. 22 AWG.
2.1.3.4
Conductor Shielding
Conductor shielding conforming to NEMA WC 70, as applicable, shall be used
on power cables having a rated circuit voltage above 2,000 volts. In
addition, conductor shielding for shielded cables shall also comply with
Section C of AEIC C8 or AEIC CS6. Strict precautions shall be taken after
application of the conductor shielding to prevent the inclusion of voids or
contamination between the conductor shielding and the subsequently applied
insulation.
2.1.3.5
Separator Tape
Where conductor shielding, strand filling, or other special conductor
treatment is not required, a separator tape between conductor and
insulation is permitted.
2.1.4
Insulation
2.1.4.1
Insulation Material
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NOTE: The insulation compounds specified herein are
of the thermosetting type. Two options are
included: cross-linked thermosetting polyethylene
(XLPE), in accordance with the National Electrical
Manufacturers Association (NEMA) publication WC 7
(Insulated Cable Engineers Association (ICEA)
publication S-66-524), or ethylene-propylene rubber
(EPR), in accordance with NEMA WC 70 (ICEA
S-68-516). These two materials alone are widely
available and can be satisfactorily compounded to
meet the requirements of a conservative cable design
for long and reliable service. The grades permitted
are all suitable for service in wet or dry locations
at 90 C. This specification does not allow the use
of "tray cable" meeting only the minimum
requirements of the National Electrical Code or
Underwriters Laboratories, which permit a 75 C wet
rating. Jackets are also thermosetting, except
certain thermoplastic compounds are permitted for
use below 601 volts, as defined in paragraph JACKET
MATERIAL, subparagraph ACCESSIBLE USE ONLY, 2,000
VOLTS OR LESS, in cases where access for cable
installation and removal would not be a problem.
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Insulation shall be cross-linked thermosetting polyethylene (XLPE) type,
meeting the requirements of NEMA WC 70, as applicable, or an
SECTION 16120A
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