1gary.....Who told you backfeeding is illegal....Maybe where you are but here it is done all the time... I had the state electrical inspector look at mine and he told me more people should do it that way instead of runing small cords to power more than they can handle. I worked as an electrician in several factories for more years than I can count. Never burnt down a factory. I'm not saying your wrong, just if you know what your doing and do it right whats the problem.