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Old 06-02-2010, 11:47 AM   #1
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Finer Points of Armored Cable


When running 3/8" AC into a box, do you end the armored cable and protective bushing at the clamp just outside the box? This is how I've seen some instructions do it, but I have been able to thread the armored cable (the metal part), by turning through the fitting so there is a length of metal cable in the box. The bushing then goes on it. This appears to be a much more secure way to do this, as the other approach looks like you could pull it out easily as the only thing holding it is the screw. Is this "into the box" approach acceptable?
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Old 06-02-2010, 03:16 PM   #2
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YOu should be able to fasten the cable in place with no more than a quarter inch protruding in past the box itself. (Not 1/4 inch past the rim of the clamp.)
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Old 06-02-2010, 03:30 PM   #3
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You have the wrong fittings. AC will not protrude into a box if you have the proper box connectors.
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Old 06-02-2010, 03:35 PM   #4
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Quote:
Originally Posted by brric View Post
You have the wrong fittings. AC will not protrude into a box if you have the proper box connectors.
agreed.


AC fittings have material across the front of them to prevent the sheath from intruding beyond the fitting.

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Old 06-02-2010, 05:20 PM   #5
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That is the fitting I'm using. This is the 3/8" cable and it can be rotated in past the hole and into the box. This is much more secure than pushing it into the clamp on the outside and securing with a screw. Either way, the bushing works, but perhaps it is held in place better when you don't put it through the hole.

This looks like it would work better than a set screw type, but I've not seen them at HD.
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Last edited by smata67; 06-02-2010 at 05:25 PM.
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Old 06-02-2010, 05:22 PM   #6
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there's a line of code in the CEC that states how much sheath your allowed to have in the box....i think with AC it's 0. Not sure what the NEC states although i'm sure there's a similar rule.
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Old 06-02-2010, 05:26 PM   #7
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You have a fitting that is too large for the AC you are using. Why ask for advice if you're going to argue about a proper installation?
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Old 06-02-2010, 06:09 PM   #8
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if you use the proper fitting, the sheath will not fit through the hole. AC comes in a variety of sizes due to the size and count of the conductors. The insulator will probable not simply stick into the end and stay.

You just simply need to get the proper fittings for the size of cable you have.


Simple test for the right fittings:

if the sheath can pass through the fitting, it's the wrong fitting.
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