Page 775 - 2018_IRC

POWER AND LIGHTING DISTRIBUTION

3. Where the panelboard is designed and con- E3907.9.3 Back wire-bending space. The distance
structed for wiring using only a single 90-degree between the center of the rear entry and the nearest termi-
bend for each conductor, including the grounded nation for the entering conductors shall be not less than the
circuit conductor, and the wiring diagram indi- distance given in Table E3907.9.1(1). Where a raceway or
cates and specifies the method of wiring that cable entry is in the wall of the enclosure, opposite a
must be used, the top and bottom wire-bending removable cover, the distance from that wall to the cover
space shall be permitted to be sized in accordance shall be permitted to comply with the distance required in
with Table E3907.9.1(2). [408.55(A) Exception Table E3907.9.1(2). [408.55 (C)]
No. 3]
4. Where there are no conductors terminated in that SECTION E3908
space, either the top or the bottom wire-bending GROUNDING
space, shall be permitted to be sized in accor-
dance with Table E3907.9.1(2). [408.55(A) E3908.1 Metal enclosures. Metal enclosures of conductors,
Exception No. 4] devices and equipment shall be connected to the equipment
grounding conductor. (250.86)
E3907.9.2 Side wire-bending space. Side wire-bending
space shall be in accordance with Table E3907.9.1(2) Exceptions:
based on the largest conductor to be terminated in that 1. Short sections of metal enclosures or raceways used
space. [408.55(B)] to provide cable assemblies with support or protection
against physical damage. (250.86 Exception No. 2)

TABLE E3907.9.1(1) [Table 312.6(B)]
MINIMUM WIRE-BENDING SPACE AT TERMINALS (see Note 1)
WIRE SIZE
(AWG or kcmil) WIRES PER TERMINAL
Compact stranded AA-8000 One (see Note 2) Two
All other conductors aluminum alloy conductors
(see Note 3) inches mm inches mm
14-10 12-8 Not specified Not specified — —
8 6 1 1 / 2 38.1 — —
6 4 2 5 0 . 8 — —
4 2 3 7 6 . 2 — —
3 1 3 7 6 . 2 — —
2 1 / 0 3 1 / 2 88.9 — —
1 2 / 0 4 1 / 2 114 — —
1/0 3/0 5 / 2 140 5 / 2 140
1
1
2 / 0 4 / 0 6 1 5 2 6 1 5 2
1 a
1 a
3/0 250 6 / 2 165 a 6 / 2 165 a
1 c
4/0 300 7 b 178 b 7 / 2 190 c
1 d
1 d
250 350 8 / 2 216 d 8 / 2 229 d
300 400 10 c 254 c 10 d 254 d
350 500 12 c 305 c 12 c 305 c
400 600 13 c 330 c 13 c 330 c
500 700-750 14 c 356 c 14 c 356 c
600 800-900 15 c 381 c 16 c 406 c
700 1000 16 c 406 c 18 c 457 c
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
1. Bending space at terminals shall be measured in a straight line from the end of the lug or wire connector in a direction perpendicular to the enclosure wall.
2. For removable and lay-in wire terminals intended for only one wire, bending space shall be permitted to be reduced by the following number of millimeters
(inches):
1
a. / inches (12.7 mm)
2
b. 1 inches (25.4 mm)
1
c. 1 / 2 inches (38.1 mm)
d. 2 inches (50.8 mm)
3. This column shall be permitted to determine the required wire-bending space for compact stranded aluminum conductors in sizes up to 1000 kcmil and
manufactured using AA-8000 series electrical grade aluminum alloy conductor material.
750 2018 INTERNATIONAL RESIDENTIAL CODE ®
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