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.