MC CABLES
Sheet rock Screw size
1'' 5/8
330.30 (D)(2) - Unsupported MC Cable
6ft or less - does not need support and is permitted when installed within an Accessible CEILING
MC Cable
Any amount of conductors is OK
Diameter
Any straight line segment that passes through the Center of the circle
To Put MC Cable into the box, what do cable fitting have to have?
Cable fitting must be Labled = Labled for specific use Listed = Approved and tested by UL (Underwiters labatory)
330.40 - MC Cable Fittings
Cable fittings must be Listed & Labeled for use with MC cable
330.17 - MC CABLE Parallel to Framing
Cable must be at least 1 1/4 in. from the nearest edge of a framing member or furring strip, or be protected by a steel plate or sleeve
Radius
Is 1/2 the diameter of the circle
330.30c - MC Cables Horizontally
MC Cable through wooden / metal framing members are considered Secured and Supported when those supports does not exceed 6ft intervals.
330.30 - Secured & Supported
MC cable must be secured every 6' intervals & need to be secured with STAPLES, cable ties, straps, or hangers.
330.24 - Bending Radius
NOT Less than 7 x the external diameter of the cable Step 1 = 7 x the diameter of the cable = the radius Step 2 = Add both radius = the diameter Step 3 = Add the cable diameter to both sides Step 4 = Add cable diameter x 2 ( for both sides) + the diameter
Examples of support beams
Staple, hangers, zip ties, strapes
330.40 - Fittings
The NEC does not require anti short bushings at the termination.
330.108 - Equipment Grounding Conductor
Traditional interlocked type MC cable is not permitted to serve as an equipment grounding conductor
UL
Underwriters Lavatories
What ground wire is used 4 Grounding method on MC Cable
Use green ground wire
How far to secure / support the cable from the box
Within 12' the first support and within 6ft after that.