• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects
    Architects
    General Contractors
    General Contractors
    Building Official & Plans Examiners
    Building Official & Plans Examiners
    Inspectors
    Inspectors
    Owners
    Owners
    Subcontractors
    Subcontractors
    Code Consultants
    Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

Section E3907 Cabinets and Panelboards

Residential Code 2018 of Kansas > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards
JUMP TO FULL CODE CHAPTER

E3907.1 Space Within Switch and Overcurrent Device Enclosures

Where the wiring space of enclosures for switches or overcurrent devices contains conductors that are feeding through, spliced, or tapping off to other enclosures, switches, or overcurrent devices, all of the following conditions shall apply:
  1. The total area of all conductors installed at any cross section of the wiring space shall not exceed 40 percent of the cross-sectional area of that space.
  2. The total area of all conductors, splices, and taps installed at any cross section of the wiring space shall not exceed 75 percent of the cross-sectional area of that space.
  3. A warning label shall be applied to the enclosure that identifies the closest disconnecting means for any feed-through conductors. (312.8)

E3907.1.1 Power Monitoring Equipment

Where the wiring space of enclosures for switches or overcurrent devices contains power monitoring equipment, all of the following conditions shall be met:
  1. The power monitoring equipment shall be identified as a field installable accessory as part of the listed equipment, or shall be a listed kit evaluated for field installation in switch or overcurrent device enclosures.
  2. The total area of all conductors, splices, taps and equipment at any cross section of the wiring space shall not exceed 75 percent of the cross-sectional area of that space.

E3907.2 Damp and Wet Locations

In damp or wet locations, cabinets and panelboards of the surface type shall be placed or equipped so as to prevent moisture or water from entering and accumulating within the cabinet, and shall be mounted to provide an air-space not less than 1/4 inch (6.4 mm) between the enclosure and the wall or other supporting surface. Cabinets installed in wet locations shall be weatherproof. For enclosures in wet locations, raceways and cables entering above the level of uninsulated live parts shall be installed with fittings listed for wet locations. (312.2)
Exception: Nonmetallic enclosures installed on concrete, masonry, tile, or similar surfaces shall not be required to be installed with an air space between the enclosure and the wall or supporting surface. (312.2 Exception)

E3907.3 Position in Wall

In walls of concrete, tile or other noncombustible material, cabinets and panelboards shall be installed so that the front edge of the cabinet will not set back of the finished surface more than 1/4 inch (6.4 mm). In walls constructed of wood or other combustible material, cabinets shall be flush with the finished surface or shall project therefrom. (312.3)

E3907.4 Repairing Noncombustible Surfaces

Noncombustible surfaces that are broken or incomplete shall be repaired so that there will not be gaps or open spaces greater than 1/8 inch (3.2 mm) at the edge of the cabinet or cutout box employing a flush-type cover. (312.4)

E3907.5 Unused Openings

Unused openings, other than those intended for the operation of equipment, those intended for mounting purposes, and those permitted as part of the design for listed equipment, shall be closed to afford protection substantially equivalent to that of the wall of the equipment. Metal plugs and plates used with nonmetallic cabinets shall be recessed at least 1/4 inch (6.4 mm) from the outer surface. Unused openings for circuit breakers and switches shall be closed using identified closures, or other approved means that provide protection substantially equivalent to the wall of the enclosure. (110.12(A)]

E3907.6 Conductors Entering Cabinets

Conductors entering cabinets and panelboards shall be protected from abrasion and shall comply with Section E3906.1.1. (312.5)

E3907.7 Openings to Be Closed

Openings through which conductors enter cabinets, panelboards and meter sockets shall be closed in an approved manner. [312.5(A)]

E3907.8 Cables

Where cables are used, each cable shall be secured to the cabinet, panelboard, cutout box, or meter socket enclosure. [312.5(C)]
Exception: Cables with entirely nonmetallic sheaths shall be permitted to enter the top of a surface-mounted enclosure through one or more sections of rigid raceway not less than 18 inches (457 mm) nor more than 10 feet (3048 mm) in length, provided all the following conditions are met:
  1. Each cable is fastened within 12 inches (305 mm), measured along the sheath, of the outer end of the raceway.
  2. The raceway extends directly above the enclosure and does not penetrate a structural ceiling.
  3. A fitting is provided on each end of the raceway to protect the cable(s) from abrasion and the fittings remain accessible after installation.
  4. The raceway is sealed or plugged at the outer end using approved means so as to prevent access to the enclosure through the raceway.
  5. The cable sheath is continuous through the raceway and extends into the enclosure beyond the fitting not less than 1/4 inch (6.4 mm).
  6. The raceway is fastened at its outer end and at other points in accordance with Section E3802.1.
  7. The allowable cable fill for conduit or tubing shall not exceed that permitted by Table E3907.8 and shall be considered as a complete conduit or tubing system. A multiconductor cable having two or more conductors shall be treated as a single conductor for calculating the percentage of conduit fill area. For cables that have elliptical cross sections, the cross-sectional area calculation shall be based on the major diameter of the ellipse as a circle diameter. [312.5(C) Exception]
TABLE E3907.8 (Chapter 9, Table 1)
PERCENT OF CROSS SECTION OF CONDUIT AND TUBING FOR CONDUCTORS
NUMBER OF
CONDUCTORS
MAXIMUM PERCENT OF CONDUIT AND
TUBING AREA FILLED BY CONDUCTORS
153
231
Over 240

E3907.9 Wire-Bending Space Within an Enclosure Containing a Panelboard

Wire-bending space within an enclosure containing a panelboard shall comply with the requirements of Sections E3907.9.1 through E3907.9.3.

E3907.9.1 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 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
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. 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)
ALL OTHER
CONDUCTORS
COMPACT
STRANDED
AA-8000
ALUMINUM
ALLOY
CONDUCTORS
(see Note 2)
WIRES PER TERMINAL
OneTwo
inchesmminchesmm
14-1012-8Not specifiedNot specified——
8-66-411/238.1——
4-32-1250.8——
21/021/263.5——
12/0376.2——
1/0-2/03/0-4/031/288.95127
3/0-4/0250-30041026152
25035041/21146152
300-350400-50051278203
400-500600-75061528203
600-700800-1000820310254
750-900—820312305
1000-1250—10254——
1500-2000—12305——
Notes:
  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.
  2. This column shall be permitted to be used to determine the minimum wirebending space for compact stranded aluminum conductors in sizes up to 1000 kcmil and manufactured using AA-8000 series electrical grade aluminum alloy conductor material in accordance with 310.106(B). The minimum width of the wire gutter space shall be determined using the all other conductors value in this table.

E3907.9.2 Side Wire-Bending Space

Side wire-bending space shall be in accordance with Table E3907.9.1(2) based on the largest conductor to be terminated in that space. [408.55(B)]

E3907.9.3 Back Wire-Bending Space

The distance between the center of the rear entry and the nearest termination for the entering conductors shall be not less than the distance given in Table E3907.9.1(1). Where a raceway or cable entry is in the wall of the enclosure, opposite a removable cover, the distance from that wall to the cover shall be permitted to comply with the distance required in Table E3907.9.1(2). [408.55 (C)]

Related Code Sections


Section E3907 Power and Lighting Distribution, Cabinets and Panelboards
, cabinets and panelboards of the surface type shall be placed or equipped so as to prevent moisture or water from entering and accumulating within ...
Residential Code 2018 of Kansas > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards
E3907.5 Power and Lighting Distribution, Unused Openings
used with nonmetallic cabinets shall be recessed at least 1 / 4 inch (6.4 mm) from the outer surface. Unused openings for circuit breakers ...
Residential Code 2018 of Kansas > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards > E3907.5 Unused Openings
E3907.7 Power and Lighting Distribution, Openings to Be Closed
Openings through which conductors enter cabinets, panelboards and meter sockets shall be closed in an approved manner. [312.5(A)] ...
Residential Code 2018 of Kansas > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards > E3907.7 Openings to Be Closed
E3907.8 Power and Lighting Distribution, Cables
Where cables are used, each cable shall be secured to the cabinet, panelboard, cutout box, or meter socket enclosure. [312.5(C)] Exception ...
Residential Code 2018 of Kansas > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards > E3907.8 Cables
E3907.9 Power and Lighting Distribution, Wire-Bending Space Within an Enclosure Containing a Panelboard
Wire-bending space within an enclosure containing a panelboard shall comply with the requirements of Sections E3907.9.1 through E3907.9.3 ...
Residential Code 2018 of Kansas > 39 Power and Lighting Distribution > E3907 Cabinets and Panelboards > E3907.9 Wire-Bending Space Within an Enclosure Containing a Panelboard
Help Contact Us Privacy Terms
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Code Compare
Code Compare
Highlight differences between any two building codes.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
VISIT PRICING
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL PRICING