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Old 08-24-2012, 04:31 PM   #16
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stranded wire gauge 2 in neutral/ground bus


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Originally Posted by jbfan View Post
Thats only rated for 70 amps!
OK, i understand that would apply for the neutral. however, thinking alongside the logic that allows for the ground to be thinner than the rest of the wires rated for a certain amperage, can i use a lug rated for 70A for the ground in a circuit rated for 100A?

in other words, if the ground wire in this cable is AWG 6 and the rest are 2 and if that ground had insulation and you used it for hot or neutral you could go up to 60A or so, i believe, can you also apply the same discount to the lug?

i am just trying to think logically here

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Old 08-24-2012, 05:32 PM   #17
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stranded wire gauge 2 in neutral/ground bus


Quote:
Originally Posted by amakarevic View Post
OK, i understand that would apply for the neutral. however, thinking alongside the logic that allows for the ground to be thinner than the rest of the wires rated for a certain amperage, can i use a lug rated for 70A for the ground in a circuit rated for 100A?

in other words, if the ground wire in this cable is AWG 6 and the rest are 2 and if that ground had insulation and you used it for hot or neutral you could go up to 60A or so, i believe, can you also apply the same discount to the lug?

i am just trying to think logically here
As long as the calculated load on the neutral doesn't exceed 90A. And since #2 SER cable has #2-#2-#2 and #4 awg conductors, a #2 AL grounded conductor is rated for 90A. The lug should be fine.
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Last edited by electures; 08-24-2012 at 05:35 PM.
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Old 08-24-2012, 05:38 PM   #18
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stranded wire gauge 2 in neutral/ground bus


It is the GROUND i am referring to. Not the neutral. The rated amperage for the neutral is the same as for the hots, as the wire is the same thickness also. But the ground wire is thinner, hence my idea of using a smaller lug too (but how much smaller, i.e. is 70A rating going too much?)

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Old 08-24-2012, 07:00 PM   #19
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stranded wire gauge 2 in neutral/ground bus


Quote:
Originally Posted by amakarevic
It is the GROUND i am referring to. Not the neutral. The rated amperage for the neutral is the same as for the hots, as the wire is the same thickness also. But the ground wire is thinner, hence my idea of using a smaller lug too (but how much smaller, i.e. is 70A rating going too much?)

Thanks
The terminal is listed for certain wire sizes. Since it is a ground wire the ampacity of the terminal is irrelevant.

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