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ProGrade, Certified Electrical Contractor
Category: Electrical
Satisfied Customers: 547
Experience:  28+ years exp. - installation, troubleshooting, & repair of commercial, & residential electrical systems.
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What can cause a reading of 75 volts on the neutral of a

Customer Question

what can cause a reading of 75 volts on the neutral of a 3-phase 480 volt generator
Submitted: 1 year ago.
Category: Electrical
Expert:  ProGrade replied 1 year ago.

Hi Gerald, welcome to

Is this an existing installation or was it recently installed? Is there a transfer switch? Is so, is the neutral switched in the transfer switch? Is the Neutral Bonded at the service? Thanks

Customer: replied 1 year ago.
Recently installed, no transfer switch, neutral is bonded at the service.
Customer: replied 1 year ago.
User even getting shocked when touching frame.
Expert:  ProGrade replied 1 year ago.

That is the frame of the generator. The generator frame should be grounded to the service ground. The neutral on the generator end should not be bonded to the ground. This should resolve the problem.

Expert:  ProGrade replied 1 year ago.

Just checking in to make sure you got my response and to see if you have any questions. Please let me know if you do and I would appreciate the courtesy of a reply. Thank you very much.

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