Meyer's Hub

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I dont think you can legally put a bond bushing on most meyers hubs.

you would have to remove the 'lock nut' to gain enough threads.

we all know you cannot use a bushing as a lock nut.

leave well enough alone

meyers hubs do include something more substantial than 'a standard locknut', and as so, meet the requirements for bonding at the service
 
izak said:
...
we all know you cannot use a bushing as a lock nut. ...
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The code only says you can't use a bushing made wholly of insulating material can't be used in place of a locknut. 300.4(G) A grounding bushing is a metallic bushing and like any metallic bushing can be used in place of the interior locknut. Having said that you can't really use a grounding bushing in place of the locknut on a hub. The hub locknut has to be made up tight to make the seal against the hub's O ring. It is unlikely that the bushing would be able to do that.
 
don_resqcapt19 said:
The code only says you can't use a bushing made wholly of insulating material can't be used in place of a locknut. 300.4(G) A grounding bushing is a metallic bushing and like any metallic bushing can be used in place of the interior locknut. Having said that you can't really use a grounding bushing in place of the locknut on a hub. The hub locknut has to be made up tight to make the seal against the hub's O ring. It is unlikely that the bushing would be able to do that.
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Plus, using a bonding bushing as a fitting locknut is probably not the use it was intended or listed for. ;)
 
don_resqcapt19 said:
Are you saying we can't use it in place of a standard locknut on conduit, or just that we can't use it on a hub?
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If it is a standard bonding bushing, it should not solely be used as a fitting locknut because it is probably not listed for that use. Bonding bushings have different specification requirements (UL467) than fitting locknuts (UL514B) and would not be tested for use as a locknut function.

As for using it on a myers-style hub with the wider locknut, there will not be enough threads left on the hub body to adequately secure an additional bonding bushing. 344.46 intends for a bushing to protect the conductors but not support the conduit. In 300.4(F), it specifically prohibits NM bushings from being used to secure a raceway or fitting, but does not mention anything about metallic bushings being used for such purpose.

This being said, there are a few bonding bushings out there that can be used to support Rigid conduit like a locknut and provide a bonding point (i.e. T&B "BlackJack). However, I do not believe that bushing is listed for use with any fitting. I looked at the listing and there is no mention of being used with fittings in place of a locknut - like a hub or standard connector.

There are other manufacturers that make insulated, bonded, hubs (i.e. T&B).
 
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