Bonding Locknut in a 277-480 system

[DARUSA]

I had an inpection in nyc last week and the inspector is require me that all the 277/480 conduits need to have bonding locknuts.( the one that have the screw in)
I try to explain him that a bonding bushing is required when you connect your pipe in a concentric or exentric knockout in order to ensure the electrical continuity of the metal raceways.
He agree with it but no matter is you make you own hole a bonding locknut is require!!!
I use only 3/4 size pipe in order to not take any chance with any of my guys for use a 1/2 inch pipe in a 1/2 inch 3/4 knockout.
Also all knockouts for feeders were made by a knockout punch for a proper size.
All my pipes are EMT and if I don't understand wrong 250.97 3 is a clear article in refer to the EMT pipe.
What is your opinion?

 

[infinity]

He's incorrect it's that simple. As far as I know there's no extra requirement for this in the NYC code.

 

[DARUSA]

Please I will like to have more inputs in order to show the inspector this tread.

 

[augie47]

Your basic references would be Art 250.97 (bonding over 250 v to ground) which refers you back to 250.92 (bonding service), however, the exception takes care of most issues where concentric and eccentric k.o.s are not encountered.
Note though that 250.100 requires special consideration in Hazardous installs in case you have any.

 

[roger]

Maybe the following illustration will help clear it up.

Roger

 

[infinity]

One side note to Rogers graphic, if the ringed KO's are listed for bonding then the bonding jumper still isn't required.

 

[Ponchik]

Can the inspector use 90.4 in his defense?
The authority having jurisdiction for enforcement of the Code has the responsibility for making interpretations of the rules......

 

[infinity]

Can the inspector use 90.4 in his defense?
The authority having jurisdiction for enforcement of the Code has the responsibility for making interpretations of the rules......

He could but what in Article 250 would give him the opinion that it's required?

 

[petersonra]

Can the inspector use 90.4 in his defense?
The authority having jurisdiction for enforcement of the Code has the responsibility for making interpretations of the rules......

The AHJ can do that. The inspector is not the AHJ. He is either an employee of the AHJ or subcontractor of some sort acting on behalf of the AHJ. In any case, the inspector is NOT the AHJ.

 

[JDB3]

Can the inspector use 90.4 in his defense?
The authority having jurisdiction for enforcement of the Code has the responsibility for making interpretations of the rules......


I had been told by a former inspector (now a NEMA rep.) that If an inspector has to fall back on 90.4, their position on the issue is very weak!!!!!!!!!

 

[Hendrix]

The AHJ can do that. The inspector is not the AHJ. He is either an employee of the AHJ or subcontractor of some sort acting on behalf of the AHJ. In any case, the inspector is NOT the AHJ.

Yes but, his supervisor can designate him the AHJ. Often times the inspector knows more than his boss :happyyes:

 

[petersonra]

Yes but, his supervisor can designate him the AHJ. Often times the inspector knows more than his boss :happyyes:

The supervisor is not the AHJ either. the AHJ is the entity that has the authority, generally given by law for our purposes. It may be the state EC board, or a building dept, but is NEVER an individual.

In practice, it may seem like there is no difference becasue the individual is who you are dealing with.

 

[infinity]

There is no local amendment in the NYC electrical code to require this. Here are all of the local amendments to Article 250 in the NYC code:

NYC 2011 Electrical Code Technical Provisions

ARTICLE 250
Grounding and Bonding


SECTION 250.52
Subsection 250.52(A)(1) – Delete the Exception in its entirety.

 

[DARUSA]

I will like to thaks all for all your comments!!!

 

[Ponchik]

I will like to thaks all for all your comments!!!

You are welcome.

did you have to install teh grounding bushing or you won the argument?

 

[DARUSA]

You are welcome.

did you have to install teh grounding bushing or you won the argument?

I don't know yet because inspector come a little late and it was no way that he inspect the building in a short period of time!!!!!
But before he left I did show him the section , we read it and he says that he will talk to his boss in refer to it. I was pretty sure of my statement but you never know, he look as a very knolege guy. I like him because no matter that we argue on this he was doing what he thought was correct.