NM Screw-in Connection to metal box (inside or outside)

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  #1  
Old 12-13-06, 10:52 AM
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NM Screw-in Connection to metal box (inside or outside)

In running NM to a metal box. I am using a screw in connection (metal). I have been leaving the screws on the outside and the connection on the inside.

Does it matter if the screw-in connection is on the inside or outside?

If it is on the outside the pro would be more room on the box. Then maybe the pro for inside would be when the screws are difficult to reach on the outside.

Thanks
 
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Old 12-13-06, 11:47 AM
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> Does it matter if the screw-in connection is on the inside or outside?

Outside the box is typical, because the clamp doesn't contribute to box fill. However, if you're fishing wire or otherwise can't get access to the outside of the box, inside is okay.
 
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Old 12-13-06, 04:05 PM
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Sounds good. thanks for the fast reply.
 
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Old 12-13-06, 06:38 PM
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Pete just a few tips. First when you say "screw in" Are you refering to this type clamp?
http://www.hammerzone.com/archives/elect/wkbench/wiringclamps.html

Sorry best image I could find in a hurry.

Dont tighten the thing too much or you will cut the insulation and may get a short to ground as a result. Hand snug with a driver is good.... be careful using the cordless screwdrivers.

Remember to ground the metal box to the wiring equipment ground wire with a bonding pigtail from the wirenut to green screw in threaded hole in the back of the box. Also ground to the green screw of the receptacle or light switch if installed.

Roger
 
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Old 12-13-06, 06:53 PM
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Good pic of the connector...Bad way to tighten it.

Tighten the locknut not the clamp. keep the crimp screws outside of the box if possable.
 
  #6  
Old 12-13-06, 09:26 PM
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Yeah, I wasnt to keen on the channel locks either.

Roger
 
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