standby genset grounding and bonding

[mclain]

Re: standby genset grounding and bonding

As per your diagram and post you are already running an ungrounded service from the utility. If your generator neutral is not grounded to the generator frame or you can disconnect it from the frame just operate the generator as an ungrounded system as well.
You will already have to ground fault indicators for your utility service since it is ungrounded.

[ September 22, 2003, 11:44 AM: Message edited by: mclain ]

 

[daniej2]

Re: standby genset grounding and bonding

Thanks for touching on this subject. I have got a 408 volt generator with a 2 Meawatt output that is wired in a WYE configeration. My Power Distribution system is 3 Wire Delta transformer. Would it be best to float the neutral or like the drawng shows add a ground plane and bond tis to the facility.
Thanks for All input
Jim

 

[daniej2]

Re: standby genset grounding and bonding

Thanks for touching on this subject. I have got a 408 volt generator with a 2 Meawatt output that is wired in a WYE configeration. My Power Distribution system is 3 Wire Delta transformer. Would it be best to float the neutral or like the drawng shows add a ground plane and bond tis to the facility.
Thanks for All input
Jim

 

[bennie]

Re: standby genset grounding and bonding

A two megawatt generator is a substantial sized machine. I suggest this installation be reviewed by a power engineer, for possibly impedance grounding.

 

[daniej2]

Re: standby genset grounding and bonding

Bennie,
Thanks for the reply but I meant a 1 Mega Watt generator. Our power distribution transformer is Delta and the generator is a WYE. It had a Neutral to Ground bond which correct me is for a four wire system. The bond has been removed to let the neutral float. Was this correct or should I install a gound plane for the neutral and bond it to ground. I really appreciate this web site.
Thanks
Jim

 

[bennie]

Re: standby genset grounding and bonding

Reconnect the neutral to the generator frame and core. Install a four wire feeder including a ground/neutral conductor from the generator to the transfer switch.

 

[Guest]

Re: standby genset grounding and bonding

Originally posted by awwt: For a permanent install you need to remove the bonding jumper if the transfer switch does not switch the neutral 250.24(A)(5)
<snip>../Wayne C.

Originally posted by bennie:
Wayne: What does the section quoted have to do with this issue?

Would it be more relevant to the issue if I reversed my language and said: For a permanent install you need to maintain the bonding jumper if the transfer switch switches the neutral?