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// CODE SNIPPET

E3907.9.1 Top and Bottom Wire-Bending Space

2017 FBC - Residential, 6th edition > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards > E3907.9 Wire-Bending Space Within an Enclosure Containing a Panelboard > E3907.9.1 Top and Bottom Wire-Bending Space
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The top and bottom wire-bending space for a panelboard enclosure shall be sized in accordance with Table E3907.9.1(1) based on the largest conductor entering or leaving the enclosure. [408.55 (A)]

Exceptions:
  1. For a panelboard rated at 225 amperes or less and designed to contain not more than 42 overcurrent devices, either the top or bottom wire-bending space shall be permitted to be sized in accordance with Table E3907.9.1(2). For the purposes of this exception, a 2-pole or a 3-pole circuit breaker shall be considered as two or three overcurrent devices, respectively. [408.55(A) Exception No. 1]
  2. For any panelboard, either the top or bottom wire-bending space shall be permitted to be sized in accordance with Table E3907.9.1(2) where the wire-bending space on at least one side is sized in accordance with Table E3907.9.1(1) based on the largest conductor to be terminated in any side wire-bending space. [408.55(A) Exception No. 2]
  3. Where the panelboard is designed and constructed for wiring using only a single 90-degree bend for each conductor, including the grounded circuit conductor, and the wiring diagram indicates and specifies the method of wiring that must be used, the top and bottom wire-bending space shall be permitted to be sized in accordance with Table E3907.9.1(2). [408.55(A) Exception No. 3]
  4. Where there are no conductors terminated in that space, either the top or the bottom wire-bending space, shall be permitted to be sized in accordance with Table E3907.9.1(2). [408.55(A) Exception No. 4]

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
All other conductorsCompact stranded AA-8000
aluminum alloy conductors
(see Note 3)
One (see note 2)Two
inchesmminchesmm
14-1012-8Not specifiedNot specified——
8611/238.1——
64250.8——
42376.2——
31376.2——
21/031/288.9——
12/041/2114——
1/03/051/214051/2140
2/04/061526152
3/025061/2a165a61/2a165a
4/03007b178b71/2c190c
25035081/2d216d81/2d229d
30040010c254c10d254d
35050012c305c12c305c
40060013c330c13c330c
500700-75014c356c14c356c
600800-90015c381c16c406c
700100016c406c18c457c
  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. 1/2 inches (12.7 mm)
    2. 1 inches (25.4 mm)
    3. 11/2 inches (38.1 mm)
    4. 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.

TABLE E3907.9.1(2) [Table 312.6(A)]

MINIMUM WIRE-BENDING SPACE AT TERMINALS AND MINIMUM WIDTH OF WIRING GUTTERS (see note 1)

WIRE SIZE
(AWG or kcmil)
WIRES PER TERMINAL
OneTwo
inchesmminchesmm
14-10Not specifiedNot specified——
8-611/238.1——
4-3250.8——
221/263.5——
1276.2——
1/0-2/031/288.95127
3/0-4/041026152
25041/21146152
300-35051278203
400-50061528203
600-700820310254
  1. Bending space at terminals shall be measured in a straight line from the end of the lug or wire connector in the direction that the wire leaves the terminal to the wall, barrier, or obstruction.

Related Code Sections


E3907.9.1 Power and Lighting Distribution, Top and Bottom Wire-Bending Space
The top and bottom wire-bending space for a panelboard enclosure shall be sized in accordance with Table E3907.9.1(1) based on the largest conductor ...
2017 FBC - Residential, 6th edition > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards > E3907.9 Wire-Bending Space Within an Enclosure Containing a Panelboard > E3907.9.1 Top and Bottom Wire-Bending Space
1405.7 Exterior Walls, Stone Veneer
into top and bottom plates or with equivalent wire ties. There shall be not less than a 0.1055- inch (2.68 mm zinc-coated or nonmetallic coated wire ...
2014 FBC - Building, 5th edition > 14 Exterior Walls > 1405 Installation of Wall Coverings > 1405.7 Stone Veneer
E3802.5 Wiring Methods, Bends
Bends shall be made so as not to damage the wiring method or reduce the internal diameter of raceways. For types NM and SE cable, bends shall be so ...
2017 FBC - Residential, 6th edition > 38 Wiring Methods > E3802 Above-Ground Installation Requirements > E3802.5 Bends
E3802.5 Wiring Methods, Bends
Bends shall be made so as not to damage the wiring method or reduce the internal diameter of raceways. For types NM and SE cable, bends shall ...
2014 FBC - Residential, 5th edition > 38 Wiring Methods > E3802 Above-Ground Installation Requirements > E3802.5 Bends
1405.7 Exterior Walls, Stone Veneer
(203 mm) on center. into top and bottom plates or with equivalent wire ties. There shall be not less than a 0.1055-inch (2.68 mm) zinc-coated ...
2017 FBC - Building, 6th edition > 14 Exterior Walls > 1405 Installation of Wall Coverings > 1405.7 Stone Veneer
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