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Unbonded neutral question

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Posted by Chuck on October 18, 2003, 4:59 pm
My aux panel has a placard that reads (generator must have a unbounded
neutral).what are they saying? does this mean the generators neutral must be
connected thru the power company?

Posted by William P.N. Smith on October 18, 2003, 6:51 pm

This means that the generator should not bond neutral and ground
together at the generator, but should use the one true bonding
location in your breaker box to tie the two of them together.

William Smith    w<underscore>smith@compusmiths.com
ComputerSmiths Consulting, Inc.    www.compusmiths.com

Posted by Chuck on October 23, 2003, 2:41 am
 Another question,does a unbounded generator need a 3 wire connection cable
or a 4 wire cable,I notice some generators use a 12/3 cable and some use a
12/4 cable.What is the 4 wire used for?

Posted by Dale Farmer on October 23, 2003, 6:18 pm

Chuck wrote:

    Commonly in the US, the three wire cable provides 120VAC service.  ( Hot,
neutral, and ground. )  The four wire cable provides 120/240VAC service. (
hot-b, neutral, and ground. )  Other arrangements are possible, read the


Posted by Bruce in Alaska on October 23, 2003, 6:34 pm

If the unbonded generator has a 4 wire hookup, then there should be:

1. Hot 120Vac Leg 1
2. Hot 120Vac Leg 2
3. Neutral
4. Ground

The neutral and ground leads should then be connected together
at the Breaker Panel and the ground should be connected to a
Ground Rod at that same point.

If there are three wires, then either this is a 120Vac connection,
or if a 240Vac connection there is no ground connection.  Most gensets
will have a 4 wire 240Vac with a pair of 3 wire 120Vac connections. One
120Vac connection for each 120Vac Leg.

Bruce in alaska
add a <2> before @

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