Ground Lug rated for 2-600kcmil

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Gategator37

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I am working on a project where the electricians installed a dry type transformer and put 3 #8 EGC and a #2 SBJumper under one lug. The lug is rated for 2-600kcmil conductors. Since the lug only states it's rated for 2-600kcmil conductors does this violate code? It appears that several of the conductors could come loose.
 
It definitely violates the listing and hence the code. Generally a lug listed for more than one wire must have the conductors all the same size.

A split bolt is another issue similar to this- I have not seen a slplit bolt that would take more than 2 wires.
 
I agree with Dennis and I would also wonder why there are 3-#8's and a #2 in this installation.
 
What we miss is why the rule "one wire per lug" exists. UL has a very rigiorous test for lugs. the current (think heat) is cycled many times. I suspect they test all the listed sizes, but not multiples. It would be interested if someone knew what the test actually was. Then we would have more respect for this UL requirement.
I have seen lugs listed for more than one wire but that info is in the catalog or carton.
 
tom baker said:
What we miss is why the rule "one wire per lug" exists. UL has a very rigiorous test for lugs. the current (think heat) is cycled many times. I suspect they test all the listed sizes, but not multiples. It would be interested if someone knew what the test actually was. Then we would have more respect for this UL requirement.
I have seen lugs listed for more than one wire but that info is in the catalog or carton.
Click to expand...

UL also tests for conductor 'pull out', especially during fault conditions.

I am amazed at the number of electricians that insist on pre-twisting conductors before they are inserted into a wirenut, but think nothing of cramming 'a bunch' of untwisted ones into a single set screw type lug.
 
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