I want to add a sub- panel in my garage from my main panel in the house, the garage is unattached and it must run over head. I want to put in a 60 amp panel, my question is do I run a neutral and ground from the house panel like a 6666 se cable or put in a separate ground rod off the sub-panel and run a 666 se cable
First off, this applies to all new posters. Put something more than "Electrical" in the title. This is the "Electrical" forum, I sure hope it is an electrical question.
OK, first off, WHY do you have to go overhead? I hope you realize this is much more difficult than underground.
Second, there is almost 100% change that you MUST run a "4-wire" feeder to the detached garage simply to meet code. In any case it is definitely a good idea.
No matter what, a detached structure supplied with a feeder MUST have a grounding electrode installed. Typically this is a ground rod (or two). If there is a metallic water pipe feeding the building that must be used as an electrode.
With the exception of the 4-wire feeder a detached structure get's treated basically the same as the supplying main building.
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