moorekeith99
Member
- Location
- Austin Texas
I was told in a different forum this was where I need to post my question.
I have a 4000 amp 277/480 Y service. The superintendent who energized this service is no longer with the company. He did so without making sure the factory bond between the neutral and ground bus was installed. I found this at a later date. Now I am fighting the mechanical contractor who has two 3 phase 3 wire motors with equipment grounds saying his motors were damaged due to the service not being bonded. I could possibly understand this, if it was a 3 phase 4 wire set up. I do not think this should have any affect on 3 phase motors such as a chiller or condenser. I also confirmed all the transformers behind the service were bonded and grounded as a separately derived system and have not had any issues there. Please let me know if there are any opinions on this issue. I had always heard a floating neutral would create spikes in voltages and in looking into this I am hearing that it only affects your meter reading because there is no reference to ground for your meter to use. Therefore the voltage readings would be fine phase to phase but wild reading phase to neutral.
I have a 4000 amp 277/480 Y service. The superintendent who energized this service is no longer with the company. He did so without making sure the factory bond between the neutral and ground bus was installed. I found this at a later date. Now I am fighting the mechanical contractor who has two 3 phase 3 wire motors with equipment grounds saying his motors were damaged due to the service not being bonded. I could possibly understand this, if it was a 3 phase 4 wire set up. I do not think this should have any affect on 3 phase motors such as a chiller or condenser. I also confirmed all the transformers behind the service were bonded and grounded as a separately derived system and have not had any issues there. Please let me know if there are any opinions on this issue. I had always heard a floating neutral would create spikes in voltages and in looking into this I am hearing that it only affects your meter reading because there is no reference to ground for your meter to use. Therefore the voltage readings would be fine phase to phase but wild reading phase to neutral.