circuit voltage.
a. Power Cables/Single-Conductor Control Cables, 2,000 Volts and Below
- The insulation thickness for single-conductor cables rated 2,000
volts and below shall be as required by NEMA WC 70, as applicable.
Some thicknesses of NEMA WC 70 will be permitted only for
single-conductor cross-linked thermosetting polyethylene insulated
cables without a jacket. NEMA WC 70 ethylene-propylene
rubber-insulated conductors shall have a jacket.
b. Power Cables, Rated 2,001 Volts and Above - Thickness of insulation
for power cables rated 2,001 volts and above shall be in accordance
with the following:
(1) Non-shielded cables, 2,001 to 5,000 volts, shall comply with
NEMA WC 70, as applicable.
(2) Shielded cables rated 2,001 volts and above shall comply with
Column B of Table B1, of AEIC C8 or AEIC CS6, as applicable.
c. Multiple-Conductor Control Cables - The insulation thickness of
multiple-conductor cables used for control and related purposes shall
be as required by NEMA WC 70, as applicable.
2.1.4.3
Insulation Shielding
Unless otherwise specified, insulation shielding shall be provided for
conductors having rated circuit voltages of 2,001 volts and above. The
voltage limits above which insulation shielding is required, and the
material requirements, are given in NEMA WC 70, as applicable. The
material, if thermosetting, shall meet the wafer boil test requirements as
described in Section D of AEIC C8 or AEIC CS6, as applicable. The method
of shielding shall be in accordance with the current practice of the
industry; however, the application process shall include strict precautions
to prevent voids or contamination between the insulation and the
nonmetallic component. Voids, protrusions, and indentations of the shield
shall not exceed the maximum allowances specified in Section C of AEIC C8
or AEIC CS6, as applicable. The cable shall be capable of operating
without damage or excessive temperature when the shield is grounded at both
ends of each conductor. All components of the shielding system shall
remain tightly applied to the components they enclose after handling and
installation in accordance with the manufacturer's recommendations.
Shielding systems which require heat to remove will not be permitted unless
specifically approved.
2.1.5
Jackets
All cables shall have jackets meeting the requirements of NEMA WC 70, as
applicable, and as specified herein. Individual conductors of
multiple-conductor cables shall be required to have jackets only if they
are necessary for the conductor to meet other specifications herein.
Jackets of single-conductor cables and of individual conductors of
multiple-conductor cables, except for shielded cables, shall be in direct
contact and adhere or be vulcanized to the conductor insulation.
Multiple-conductor cables and shielded single-conductor cables shall be
provided with a common overall jacket, which shall be tightly and
concentrically formed around the core. Repaired jacket defects found and
corrected during manufacturing are permitted if the cable, including
jacket, afterward fully meets these specifications and the requirements of
SECTION 16120A
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