ECN Forum Forums General Topics of the Trade General Discussion Area Grounding Electrode Conductor Connector?

It looks like an MC connector with a grounding locknut. I would guess armored ground is being used.

Curt

66WV:
"NMC" connector is a romex connector
(Non-Metalic Cable), sorry for the confusion,
some of us up here call them RX conn, for "Romex Connector" but, alas "Romex" is actually a registered trade name,

John

Oh, sorry, John, I thought I was missing something... I had no idea it was a typo!

I've called them NMC (non-metallic cable) connectors too!

Doh!

pg 39 nails it,
both my milbank & anchor catalogs show a 1/4~1/2 combo ko.......

(A clip from page 39)

Where do I find similar online info for a GE TM820RCUFL 200A 3R Feed-through disconnect?

314.17 Conductors Entering Conduit Boxes or Fittings sends me to 314.17(D) Conductors 4 AWG and Larger (I use #4 bare) which sends me to 300.4(F) Insulated Fittings which states "ungrounded conductors" so it's exempt there...

250.64 Grounding Electrode Conductor Installation doesn't seem to help much either...

Aye yi yi... (or however you spell that!)

heh! 250.64(E) was my first stop too....

Many years ago, I went on a service call where the customer was complaining of bright/dim lights in their home.

This, as we all know, usually means a bad neutral.

When I took the cover off of the panel I noticed an arcing between the GEC and the panel where it passed through this 1/4" (or 5/16") hole.

It must have been arcing for some time because the GEC (solid copper #6) was discolored due to heat as was the metal of the panel wall.

I did find out that the neutral was bad and ended up upgrading the SE.

Ever since then I've been using a 1/2" NMC cable connector. I believe that that arcing wire could have caused a fire if it had been near something combustible and that it would be better if the GEC was secured as it passed through the wall of the panel.

Well, safety implications are noted. However, the problem is the possible code loop where there are two solutions to a problem, and both may violate 110.3(B) for not being listed for the purpose.

3/8" NMC Connectors are not listed for a single, bare, solid, #4 AWG conductor.

If the connector Joe shows is indeed a BX connector, it would not be listed for my application, as I cannot aquire amoured #4 or #6 bare or insulated green conductors at my supplier.

The 1/4" hole in the enclosures (with the exception of Sq D) are apparently not listed for anything.

I guess I could use sched 80 PVC all the way down to 6" below grade, but that would end an interesting discussion!

Master,

It sounds like the Panelboard was not bonded properly.

Bill