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Code requires an interlock(transfer switch) that prevents the main feed from being switched on while the generator feed is on or the generator feed switched on while the main feed is energized(works both ways) When you turn off the main you do prevent feeding back into the grid but the interlock...

Yikes, let me get my electrical blinders off. Great point, during our latest storm we've had several folks taken to the hospital hereabouts for running the generator in the garage and gassing themselves.

Good point, we had an AHJ issue come up here having to do with utility provider and it was determined in court that the State is the AHJ and had the final say since the utility provider is a corporation and not responsible for code enforcement. It may differ where you live. So , if we can get...

If the NEC is more stringent then local codes then it has to be followed(provided your state has adopted it, not all have) If local codes are more stringent than the NEC then they need to be followed in addition to the NEC. Depending on who you talk to from your utility provider you can get...

I've seen quite a bit of traffic on this so as an electrical inspector I have to weigh in, When connecting a generator as a means of backup power make sure to follow the National Electric Code and all applicable local codes !!!! If you don't have a transfer switch(manual of automatic)do not...