OK, I have been asked the question again and confused myself yet again.
First, I always bond neutral and ground at the main service disconnect. Running back out to the utility transformer is the phase conductors, neutral and ground. My utility company says don't run both neutral and ground to their service transformer. Both of these will be connected to the same point (ground) and so one is not needed since it is connected to same point and therefore just an extra wire. The utility bonds neutral to ground at the transformer.
OK, now I'm working on a large site where we are running 13.2KV around the site and serving many buildings from this. So essentially, I am the utility. Should I bond the each buildings transformer neutral to ground and of course also bond the neutral and ground inside the buildings at the main disconnect? Do I need both the neutral and ground between the transformer and main? If I only run the one neutral/ground between the transformer and the main instead of both a neutral and a ground - what do you call this wire - a neutral or a ground?
First, I always bond neutral and ground at the main service disconnect. Running back out to the utility transformer is the phase conductors, neutral and ground. My utility company says don't run both neutral and ground to their service transformer. Both of these will be connected to the same point (ground) and so one is not needed since it is connected to same point and therefore just an extra wire. The utility bonds neutral to ground at the transformer.
OK, now I'm working on a large site where we are running 13.2KV around the site and serving many buildings from this. So essentially, I am the utility. Should I bond the each buildings transformer neutral to ground and of course also bond the neutral and ground inside the buildings at the main disconnect? Do I need both the neutral and ground between the transformer and main? If I only run the one neutral/ground between the transformer and the main instead of both a neutral and a ground - what do you call this wire - a neutral or a ground?