Ground to Neutral Bond

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bwyllie

Senior Member
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MA
An existing facility is served from a exterior 2500KVA transformer with 480Y/277V on the secondary. The present neutral to ground bond is at the main switchboard. The client would like to install a Manual transfer switch outside that would get its normal power from the transformer and back up from a portable generator. A couple of questions:

1) Would the Transfer switch require a OCPD w/ gfi protection on the normal power side since this is the first termination of the transformers secondary conductors?

2) If yes to #1, then wouln't the neutral to ground bond need to occur at the transfer switch?

thanks
 
Re: Ground to Neutral Bond

NEC 230.82 lists equipment ahead of the service disconnecting means and a standby power transfer switch is not listed. Check to see if the board manufacturer can remove the bus between the main and distribution and get cable landings.
 
Re: Ground to Neutral Bond

thans for the response nvcape, could you elaborate on the suggestion of removing the bus between the main and distribution, I am not quit sure of what that does?
 
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