MEGA MC Cable Installation & Application Guide - Southwire
MEGA MC Cable Installation & Application Guide - Southwire
MEGA MC Cable Installation & Application Guide - Southwire
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page 10<br />
(C) hacksaw<br />
Use a sharp hacksaw blade with at least 32 teeth per inch to cut any size of armored cable. You<br />
will need a heavy-duty frame to hold the cable taut.<br />
(1) Secure the cable in a vise or support.<br />
(2) Cut two adjacent convolutions at approximately 60 degrees (illustration).<br />
(3) Remove the cable from the vise.<br />
(4) Grip the cable on each side of the cut, twist and slide off the armor.<br />
using hacksaw to cut two adjacent convolutions<br />
(4) pulling <strong>MC</strong> <strong>Cable</strong> C<br />
Removing mylar tape from condutors<br />
Caution<br />
Cutting <strong>MC</strong> cable armor may leave sharp edges. always protect your hands and arms with<br />
protective sleeves and work gloves.<br />
assessing the pull—Begin planning an <strong>MC</strong> cable pull by assessing the difficulty of the pull. The vast<br />
majority of <strong>MC</strong> cable pulls are less than 200 feet, with only a few bends. These installations generally<br />
require no calculations of pulling tension and sidewall pressure. This section will give some general<br />
guidelines and considerations for simple pulls. For more complex installations, refer to Annex A,<br />
“Calculating Roller Spacing and <strong>Cable</strong> Pulling Tensions,” in the back of this book.<br />
general caution about bending radius and sidewall pressure—The robust construction of <strong>MC</strong><br />
cable does not mean that it is indestructible. To protect the cable while pulling, you must configure<br />
sheave wheels, pulleys and rollers to prevent damage to the cable from bending or excessive sidewall<br />
pressure.<br />
bending radius for permanent training—Before the cable is pulled in, check the radius of each<br />
bend that will be in the cable after installation. The minimum allowable bending radius for cable with<br />
interlocked armor or corrugated continuous welded armor cable is seven times the overall diameter of<br />
the cable (per NEC ® 330.24). <strong>Cable</strong>s with smooth (non-corrugated) continuous welded armor require<br />
a minimum bend radius of 10 to 15 times the overall diameter of the cable. As long as you observe<br />
the limits on pulling tension and sidewall pressure, there is no restriction on the number of bends in<br />
an <strong>MC</strong> cable installation.<br />
<strong>Southwire</strong> <strong>MC</strong> inStallation <strong>Guide</strong> section 2. cAble riGGinG And instAllAtion
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