Transformer GEC Bonding

[big john]

When bringing the GEC out of a transformer, does it have to be bonded at the point where it passes through the metal transformer enclosure? (I know it's a good idea, but not sure if it's required.)

250.64(E) says to bond each end of the enclosure... So do I count the point where the GEC is connected to the SDS as one "end" of the enclosure and then bond as it leaves the transformer through the other "end" of the enclosure?

Thanks a bunch.

-John

 

[M. D.]

Some say yea others nay , I say why not ? surely not going to put the job over budget is it ??

http://forums.mikeholt.com/showthread.php?t=105170

 

[A/A Fuel GTX]

When bringing the GEC out of a transformer, does it have to be bonded at the point where it passes through the metal transformer enclosure? (I know it's a good idea, but not sure if it's required.)

-John

I'd say, no since it's already bonded to the transformer frame via the mechanical lug the GEC is landed to. Also, most of the installs I've seen bring the GEC up through one of the vent slots at the bottom of the enclosure so bonding at that point would be hard to do. I don't think the same concerns regarding a GEC metallic raceway and bonding both ends of that would apply here.

 

[tom baker]

The intent of the NEC is that its bonded. There is a fitting made for this called a Kenny Clamp. By the way, Mike Holt shows this fitting in his graphics with no note on what it is.

 

[A/A Fuel GTX]

Here you go.......Seems like a romex connector would do the same thing in fact I use romex connectors when bringing in a GEC to a panelboard. I know.....it's a listing thing

 

[Pierre C Belarge]

I believe the designer of the Kenny Clamp sold his product to Arlington.

I was at the Eastern Section meeting of the IAEI this past October. We discussed this very issue. CMP #5 members and UL reps stated that the GEC entering the service enclosure and bonded to the bus that is directly bonded to the enclosure, is not required to be bonded to the enclosure where it enters the enclosure.

 

[infinity]

CMP #5 members and UL reps stated that the GEC entering the service enclosure and bonded to the bus that is directly bonded to the enclosure, is not required to be bonded to the enclosure where it enters the enclosure.

I would agree with that wholeheartedly. Using a bonding bushing on a raceway for attachment of the GEC to the raceway would just be redundant therefore it's not required.

 

[iwire]

I would agree with that wholeheartedly. Using a bonding bushing on a raceway for attachment of the GEC to the raceway would just be redundant therefore it's not required.

I agree as well, the NEC does not require us to bond it twice to the same enclosure.

 

[raider1]

I agree as well, the NEC does not require us to bond it twice to the same enclosure.

I will agree as well.

Chris

 

[brian john]

The kenny clamp designed by an inspector than man mandatory in his jurisdiction.

 

[benaround]

The kenny clamp designed by an inspector than man mandatory in his jurisdiction.

Still, It's not the kind of thing that just anyone can do.

 

[luckyshadow]

The kenny clamp designed by an inspector than man mandatory in his jurisdiction.

What jurisdiction would that be?

 

[George Stolz]

Check out this thread. According to this site, a fellow named Wayne Robinson invented it. Pierre Belarge claims to have met the inventor face-to-face, perhaps you could shoot him a PM to verify the claims in the thread I linked to.

 

[dcspector]

Check out this thread. According to this site, a fellow named Wayne Robinson invented it. Pierre Belarge claims to have met the inventor face-to-face, perhaps you could shoot him a PM to verify the claims in the thread I linked to.

I know Wayne very well "Chief Electrical Inspector Montgomery Co., Md."
Contact info: kennyclamp@comcast.net or phone 410-741-9551 or fax 410-741-1240

 

[dcspector]

correction.....Prince George County.....They all run together after awhile here in DC and Md.

 

[benaround]

What if 'big john' had stubed up the GEC in a RMC near the bottom of the transformer,

would a bond bushing or equal be needed for the RMC??

 

[dcspector]

What if 'big john' had stubed up the GEC in a RMC near the bottom of the transformer,

would a bond bushing or equal be needed for the RMC??

Yes, If I understand your post completely 250.64(E)

 

[billsnuff]

conversely.....

conversely.....

I agree as well, the NEC does not require us to bond it twice to the same enclosure.

can you just stop at the clamp?