250.92 EMT Connector

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augie47

augie47

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An 24" section of EMT is installed between a meter and service disconnect. The location is such that hubs are not needed.
Standard compression type EMT Connectors are used and no concentric or eccentric knockouts are used. A standard locknut and plastic bushing is installed inside the enclosures.
Is a grounding type locknut or bushing necessary since this conduit contains service conductors or do standard EMT fittings meet the requirement in 250.92(B)(3) ?
 
IMO the metallic service raceway needs to be bonded by a method other than a standard locknut.
 
That's my take..
but the wording:

"(3) Threadless couplings and connectors where made up tight for metal raceways and metal-clad cables "

vs

"Standard locknuts or bushings shall not be the sole means for the bonding required by this section."

has always given me problems. GRS and IMC made up with locknuts has always been a "no". but the wording of (3) (above) has made me question EMT Connectiors.
 
augie47 said:
That's my take..
but the wording:

"(3) Threadless couplings and connectors where made up tight for metal raceways and metal-clad cables "

vs

"Standard locknuts or bushings shall not be the sole means for the bonding required by this section."

has always given me problems. GRS and IMC made up with locknuts has always been a "no". but the wording of (3) (above) has made me question EMT Connectiors.
Click to expand...


How about this, the lock nut is not part of the threadless coupling or connector. You need a lock nut to install the fitting, but a standard one is not okay in this app.

It is like a copper plumbing fitting, you need solder to install it, but it is not part of the fitting.
 
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