anti-shorts

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tommyrice

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couldn't someone argue anti-shorts should be used because they. were attached to the roll of mc by the manufacturer.If the manufacturer includes them with the roll someone might assume they should be used per manufacturer's instructions
 
I agree with Bob, just because they're supplied you don't need to use them. The same argument could be used to say that you must use the small wirenuts that come with a fixture.
 
cpal said:
this argument is geting pretty old if someone wants to mandate red heads for MC, I suggest they submitt a proposal.

The NECdoes not REQUIRE red heads on MC and neither does the mfg.
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A proposal was sent in for the 2005 code.
7-77 Log #314 NEC-P07
(330-40)
Final Action: Reject
Submitter: Rene Loubet, Rene? Loubet Electric
Recommendation:
Add additional wording to read as follows:
"Fittings used for connecting type MC cable to boxes, cabinets, or other equipment shall be listed and identified for such use. An
insulating bushing or its equivalent shall be provided between the conductors and the armor as to afford adequate protection for the
conductors. The fittings used to connect type MC cable to boxes, cabinets or other equipment shall be of such design that the insulating
bushing or its equivalent will be visible for inspection."
Substantiation:
As the armor of type MC cable is cut, a sharp edge is incurred on the inner part of the jacket subjecting the insulation of the conductors
to be cut and exposing the conductor. With the use of an insulating bushing or its equivalent, this damage would be eliminated. A
problem that I have encountered is when a clamp style connector is used on aluminum jacketed MC cable, overtightening of the screws
can cause the cable to collapse inward damaging the insulation on the conductors.
Panel Meeting Action: Reject
Panel Statement:
Anti-short bushings are not required for Type MC cable in accordance with the listing of the product. The termination fittings approved
for use with Type MC cable are designed such that the wires will not come in contact with the cut edge of the armor since the throat of the
fitting is small enough to prevent contact with the armor. Type MC termination fittings perform the same function for Type MC cable as
Type AC terminations, plus the anti-short bushing does for Type AC cable.
Number Eligible to Vote: 15
Ballot Results: Affirmative: 15
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