Suppose I am designing a building with the service entrance electrical equipment on the top floor of a four story building. And suppose that the utility transformer is located outside at ground level.
The utility will necessarily make an N-G bond at the transformer secondary. And there will also be a N-G bond in the service gear on the fourth floor.
The building structural steel and concrete reinforcing are all bonded and made electrically continuous. In other words, the N-G bond at the utility transformer and the N-G bond in the service gear have two purposely made parallel paths. The first being the grounded conductor (neutral) pulled with the service conductors and the second being the structural steel.
I am curous to obtain opinions about the code implications of this situation and what alternatives are available.
The utility will necessarily make an N-G bond at the transformer secondary. And there will also be a N-G bond in the service gear on the fourth floor.
The building structural steel and concrete reinforcing are all bonded and made electrically continuous. In other words, the N-G bond at the utility transformer and the N-G bond in the service gear have two purposely made parallel paths. The first being the grounded conductor (neutral) pulled with the service conductors and the second being the structural steel.
I am curous to obtain opinions about the code implications of this situation and what alternatives are available.