Bonding Grounding Electrode Conductor to Transformer

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this has got me wondering....

how about everyone tell me if this picture represents a proper way to terminate a transformer as far as bonding, and GEC is considered
 
the way ive seen it done most is to take a full sized jumper from XO to a lug on the case (bolted thru one of the vent slots where no one ever removes the paint)

and then stack a couple lugs on top of that one and connect ALL GEC and EGC with one bolt.

usually a 1/4 toggle bolt.

which i think is total CRAP
 
weressl said:
Eaton:I.L. PG24836G-591H http://www.eaton.com/ecm/idcplg?IdcService=GET_FILE&dID=67087

Acme catalog also shows ground stud bolts that have both inside and outside threads available for connection.

I disagree that it is a violation.
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All I see in the Eaton document is the grounding bolt that would be used for the bonding of the transfomer frame to the enclosure and to the primary EGC.
Based on the following quote from that document, they really don't understand the NEC terms.
Grounding

As required by the National Electrical Code, connect a ground cable to the transformer enclosure. The transformer core is grounded to enclosure.​
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izak said:
this has got me wondering....

how about everyone tell me if this picture represents a proper way to terminate a transformer as far as bonding, and GEC is considered
Click to expand...

What is that on the conduit entry for the GEC? ...looks like a rigid coupling and a cable connector :eek:

Otherwise it's wired okay... but the GEC, and secondary EGC seems a little small. The size of the GEC may just be because of the connected electrode(s).
 
yes, i am sorry, but the contractor i was working for (as well as most in this state) considers a ROMEX connector to approximate a bond bushing...

(at least i tried)


the GEC was #2, which was sized according to the prints... actually, the prints called for #4 I think, but since the EGC on the secondary side to the low voltage panel was #2, and i had some extra left, i sorta sneaked it in as #2 instead of #4.

most of the guys i worked for would use #6 and consider it OK, even on a 112.5 kva transformer....
 
izak said:
yes, i am sorry, but the contractor i was working for (as well as most in this state) considers a ROMEX connector to approximate a bond bushing.......
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They can consider all they want but it is NOT designed, built and tested for that purpose. A hammer can serve as a screwdriver......but it is just wrong.:smile:


izak said:
the GEC was #2, which was sized according to the prints... actually, the prints called for #4 I think, but since the EGC on the secondary side to the low voltage panel was #2, and i had some extra left, i sorta sneaked it in as #2 instead of #4.

most of the guys i worked for would use #6 and consider it OK, even on a 112.5 kva transformer....
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#2 is often used as a standard minimum. Since EGC is often routed as exposed, without raceway protection, mechanical strength is a consideration.
 
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