I have question regarding article all of 250.30, 250.50 and 250.58.
Background:
I also have pictures of the installation that I could send if needed.
I have the contractor and his engineer telling me this is OK. I am not convinced of this.
I have a 500KW, 3 phase, 480v generator that is the stand-by power for a new building. The generator is clearly a separately derived system due to the 4 pole auto transfer switch. The grounding electrode system for the bldg. consists of the water pipe, foundation, and bldg. steel which are properly bonded and a GEC is properly terminated to the 800 amp utility disconnect main bonding jumper.
The contractor installed 2 ground rods local to the generator and did not bond to the grounding electrode system for the bldg. My opinion is that the separately derived system (the 500 kw generator) shall be connected to the same grounding electrode system for the bldg. served.
Questions.
1. Are the rod electrodes at the generator adequate to perform their intended function?
2. Does the generator need to be connected to the building's grounding electrode system?
3. In your opinion, should I pursue this further with the contractor?
Background:
I also have pictures of the installation that I could send if needed.
I have the contractor and his engineer telling me this is OK. I am not convinced of this.
I have a 500KW, 3 phase, 480v generator that is the stand-by power for a new building. The generator is clearly a separately derived system due to the 4 pole auto transfer switch. The grounding electrode system for the bldg. consists of the water pipe, foundation, and bldg. steel which are properly bonded and a GEC is properly terminated to the 800 amp utility disconnect main bonding jumper.
The contractor installed 2 ground rods local to the generator and did not bond to the grounding electrode system for the bldg. My opinion is that the separately derived system (the 500 kw generator) shall be connected to the same grounding electrode system for the bldg. served.
Questions.
1. Are the rod electrodes at the generator adequate to perform their intended function?
2. Does the generator need to be connected to the building's grounding electrode system?
3. In your opinion, should I pursue this further with the contractor?