Sparky,
Unless there is some kind of mechanical interconnect between the main breaker and the back fed breaker at your neighbor's house, his installation is in violation of 702-6. If there is an interlock then both systems are OK, except that the grounded conductor to the generator frame must be removed in his and must be inplace in yours. You must also have a grounding electrode system connected to the grounded conductor at your generator.
Don(resqcapt19)
