I have a residential customer with a 400 amp service that has a 43KW backup natural gas powered generator installed at his home. this generator is housed in a detached garage which also houses, a pair of riding lawnmowers, 4 four wheelers, 4 snowmobiles, and the biggest longest motorhome I've ever seen, as well as numerous gas containers, kerosine containers, and kerosine space heaters. Over the last few years he has also added to the detached garage another 1900 sq feet which includes a living space, bathroom, gameroom and attic storage. This addition has its own 200 amp service. Now for the questions, what code problems are we looking at in this application, what safety concerns, what about the possible negative pressure effects, not to mention no panel labling to indicate more than one service supply to this building. Also the owner would like to add several circuits from the detached garage addition to the generator via another tranfer switch. Can this be legally done? Thats about it for now, what do you think??

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