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Wiring methods shall be installed and supported in accordance with Table E3802.1. (Chapter 3 and 300.11)
TABLE E3802.1 (Chapter 3)
GENERAL INSTALLATION AND SUPPORT REQUIREMENTS FOR WIRING METHODSa, b, c, d, e, f, g, h, i, j, k
INSTALLATION REQUIREMENTS (Requirement applicable only to wiring methods marked "A" ) AC
MC
EMT
IMC
RMC
ENT FMC
LFC
NM
UF
RNC
RTRC
SE SRa USE
Where run parallel with the framing member or furring strip, the wiring shall be not less than 11/4 inches from the edge of a furring strip or a framing member such as a joist, rafter or stud or shall be physically protected. A A A A A
Bored holes in framing members for wiring shall be located not less than 11/4 inches from the edge of the framing member or shall be protected with a minimum 0.0625-inch steel plate or sleeve, a listed steel plate or other physical protection. Ak Ak Ak Ak Ak
Where installed in grooves, to be covered by wallboard, siding, paneling, carpeting, or similar finish, wiring methods shall be protected by 0.0625-inch-thick steel plate, sleeve, or equivalent, a listed steel plate or by not less than 11/4-inch free space for the full length of the groove in which the cable or raceway is installed. A A A A A A A
Securely fastened bushings or grommets shall be provided to protect wiring run through openings in metal framing members. Aj Aj Aj
The maximum number of 90-degree bends shall not exceed four between junction boxes. A A A A
Bushings shall be provided where entering a box, fitting or enclosure unless the box or fitting is designed to afford equivalent protection. A A A A A A
Ends of raceways shall be reamed to remove rough edges. A A A A A
Maximum allowable on center support spacing for the wiring method in feet. 4.5b, c 10 3b 4.5b 4.5i 3d 2.5e 2.5
Maximum support distance in inches from box or other terminations. 12b, f 36 36 12b, g 12h, i 36 12
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad.
  1. Installed in accordance with listing requirements.
  2. Supports not required in accessible ceiling spaces between light fixtures where lengths do not exceed 6 feet.
  3. Six feet for MC cable.
  4. Five feet for trade sizes 11/4 through 2 inches, 6 feet for trade sizes 21/2 through 3, 7 feet for trade sizes 31/2 through 5 inches, 8 feet for trade size 6 inches.
  5. Two and one-half feet where used for service or outdoor feeder and 4.5 feet where used for branch circuit or indoor feeder.
  6. Twenty-four inches for Type AC cable and 36 inches for interlocking Type MC cable where flexibility is necessary.
  7. Where flexibility after installation is necessary, lengths of flexible metal conduit and liquidtight flexible metal conduit measured from the last point where the raceway is securely fastened shall not exceed: 36 inches for trade sizes 1/2 through 11/4, 48 inches for trade sizes 11/2 through 2, and 5 feet for trade sizes 21/2 and larger.
  8. Within 8 inches of boxes without cable clamps.
  9. Flat cables shall not be stapled on edge.
  10. Bushings and grommets shall remain in place and shall be listed for the purpose of cable protection.
  11. See Sections R502.8 and R802.7 for additional limitations on the location of bored holes in horizontal framing members.

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