Metallic vs. non metallic SO connectors [RE-wrenches]

[William Miller]

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As most of you know by now, we use only conduit to connect Shell modules, 
specifically 1/2" non-metallic flex.  We install Arlington connectors which 
are entirely plastic except for a metal lock nut.  There does not appear to 
be any question about compliance with these connectors.

We tighten the lock nuts with the Klein D333-8 lock nut/reaming 
pliers.  They work great, but the joints can get stiff and can be a bear to 
loosen up.  Keep them lubricated.

William Miller




At 06:48 PM 2/21/2005, you wrote:

>We use a UL listed plastic strain relief from Del City Wire. Its a little 
>heavier duty than the ones that come with some modules, and since they 
>don't have lock nuts, we supply our own metal ones. I work on a lot of old 
>modules here, and I see about 15% to30% failure of those old plastic 
>locknuts. If working with a tracking system, the locknut failure can 
>loosen the electrical connection in the module J box, which (with other 
>factors) can lead to a nasty terminal block meltdown. I'll send some 
>pictures if anyone wants. Considering the cost of 1/2" steel lock nuts, 
>why keep using the inferior plastic ones?
>What are other wrenches using to tighten those pesky strain reliefs 
>without digging into the back of the module, twisting up the wire, or 
>straining the sometimes wimpy j box? I use a small 7" channel locks.
>
>Ray

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