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Not enough info.. Is it a motor or a hot tub sub panel?? But if it is a continuous load ( running 3 hrs or more at one time) it needs to be 125% of the load or in your case a 80A breaker rated for...

2*k*i*l/cmil that is the formula for Voltage Drop

2 Being the common
K Being the type wire you are using (12.9 Copper 22.4 AL)
I For ampacity (How many amps to deliver)
L Length of the wire...

Tk Russel wrote "This system is usually two eight foot ground rods , spaced 6 foot or more apart, and a wire going the water system. If you have a water meter, the #6 wire may need to connect to both...

According to the NEC the only thing it really refers to is the fact that it needs to be properly grounded, properly sized for ampereage and that it needs to be ground faulted to equpiment use...

All of these questions could be answered in the NEC 2011.

A Massachusetts Journeyman Electrician Class E is and older type of license. I am a Licensed Electrician with class B license... While my colleague that got his license is a class JR.. It is all the...