oakridge2002
Member
I have a 480V MCC on a project site and I'm concerned about the service installation. The electrical contractor in charge of the installation claims that it is OK based on some information he read about 3 phase transformer configurations.
Here are the service voltage readings: (I can't imagine which configuration produces these results.)
A-B=480V
B-C=480V
A-C=480V
A-GROUND=480V
B-GROUND=15V
C-GROUND=15V
We will be on site for startup in a few weeks and I have major safety concerns with what I have found. I'm not sure how these readings are possible unless the equipment is not bonded properly which I already told the electrical contractor and he has denied that there is a problem.
We are only supplying equipment and startup services, we are not the local electrical authority; however I feel that our company is risking serious safety hazards to startup under these conditions.
I am looking for input on this.... Am I correct in seeing a safety issue here? How do you suggest I get the electrical contractors attention short of bringing the local inspector in which will not be pleasant for me from a customer relations point of view?
This place is full of NEC violations and I will refuse to put my companies personel at risk on this job while this condition exists unless someone can prove support for the electrical contractor and the safety of the installation.
Thanks
Here are the service voltage readings: (I can't imagine which configuration produces these results.)
A-B=480V
B-C=480V
A-C=480V
A-GROUND=480V
B-GROUND=15V
C-GROUND=15V
We will be on site for startup in a few weeks and I have major safety concerns with what I have found. I'm not sure how these readings are possible unless the equipment is not bonded properly which I already told the electrical contractor and he has denied that there is a problem.
We are only supplying equipment and startup services, we are not the local electrical authority; however I feel that our company is risking serious safety hazards to startup under these conditions.
I am looking for input on this.... Am I correct in seeing a safety issue here? How do you suggest I get the electrical contractors attention short of bringing the local inspector in which will not be pleasant for me from a customer relations point of view?
This place is full of NEC violations and I will refuse to put my companies personel at risk on this job while this condition exists unless someone can prove support for the electrical contractor and the safety of the installation.
Thanks