Michigan Administrative Code › Department - Licensing and Regulatory Affairs › Bureau of Construction Codes › Construction Code Commission General Rules › Construction Code › Part 5 - RESIDENTIAL CODE › Section R. 408.30537a - Wiring methods

Current through Vol. 24-12, July 15, 2024
Rule 537a.
Section E3803.6 and tables E3801.4, and E3802.1 are
						amended to read as follows:
E3803.6.
					 Raceway seals. Conduits or raceways shall be sealed or plugged at either or
					 both ends where moisture will enter and contact live parts. Sealants shall be
					 identified for use with the cable insulation, shield, or other components.
TABLE E3802.1
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
PVC
SE
SRa
Where run parallel with the framing member or
									 furring strip, the wiring shall be not less than 1 1/4 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 1 1/4 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 1 1/4-inch free space for the full length of
									 the groove in which the cable or raceway is installed.
A
-
A
A
A
-
A
A
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 4 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
10l
3b
4.5b
4.5i
3d, l
2.5e
-
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.
a. Installed in accordance
					 with listing requirements.
b.
					 Supports not required in accessible ceiling spaces between light fixtures where
					 lengths do not exceed 6 feet.
c.
					 Six feet for MC cable.
d. Five feet
					 for trade sizes greater than 1 inch.
e. Two and one-half feet where used for
					 service or outdoor feeder and 4.5 feet where used for branch circuit or indoor
					 feeder.
f. Twenty-four inches for
					 Type AC cable and 36 inches for interlocking Type MC cable where flexibility is
					 necessary.
g. 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
					 &frac12 through 1 1/4, 48 inches for trade sizes 1 &frac12 through 2
					 and 5 feet for trade sizes 2 &frac12 and larger.
h. Within 8 inches (203 mm) of boxes without
					 cable clamps.
i. Flat cables shall
					 not be stapled on edge.
j. Bushings
					 and grommets shall remain in place and shall be listed for the purpose of cable
					 protection.
k. See Section R502.8
					 and R802.7 for additional limitations on the location of bored holes in
					 horizontal framing members.
l.
					 Raceways may be unsupported where the raceway is not more than 900 millimeters
					 (36 inches) long and remains in unbroken lengths (without coupling).
Such raceways shall terminate in an outlet box, junction
						box, device box, cabinet, or other termination at each end of the
						raceway.