Self Grounding Locknuts

[mdshunk]

I have only recently heard the term "self-grounding locknuts". I thought all locknuts were self grounding. No? On my truck I have bins of various locknuts, some brand new, some of the bigger sizes are nicer ones saved from tear-outs. When I need a locknut, I grab whatever. How can I tell (visually) whether the locknut can be used on a metal conduit system, where it will be required to provide the ground? Maybe someone can post some pics of self-grounding and non-self-grounding locknuts? I do know, sort of instinctively, that some styles seem like they 'should' ground better, but all seem to have angled teeth. I can't say I've seen a modern locknut that has flat teeth. I know that the electricians of another generation used to use "square" type locknuts that were flat. Is this the non grounding type? I don't even know where I'd buy one of those, even if I wanted one. Thanks.

[rlfrazee]

mdshunk I may be wrong but pretty sure self-grounding is the locknut that has the ears of the locknut turned in so that they bite into the enclosure to penetrate the paint if needed. I have a pic (one on the left) but not sure it has turned in ears(cant tell) Anyway it would be of this type only with ears angled. The pic on the right is non-grounding type....RL

http://www.grainger.com/images/products/5XC30.JPGhttp://www.grainger.com/images/products/3LR09.JPG
Grainger Catalog

[mdshunk]

Thanks... that clears it up. I didn't even know the non-self-grounding (pic on right) locknuts were even available. I'm sure everything I have is self-grounding.

[6pack]

The self grouding locknuts that I referred to,(no picture)are locknuts that have a srew in them. After tightening locknut itself you then tighten set screw, which now seets into panel metal, j Box what ever your entering and need "BONDING". They are not accepted when used in concentric ko's though.Much easier than a bonding bush and wire.
The pictured locknuts are not as such, both are standard locknuts.

[rlfrazee]

Hey Mdshunk I think I found a pick of the type locknut wannabee is refering to below. Grainger in the pic above describes the eared locknut as self grounding so go figure.....RL

http://www.aifittings.com/images/g3_gl50.gif

[6pack]

thats the one! RL would suppose this style is looked upon as not loosening up loosing bond. A bushing is still needed(plastic or metal) 1" or larger. Also free's up that one bus hole you may be looking for downroad.