Originally posted by resqcapt19:
[B]There is no requirement to break the grounded conductor (neutral) at the transfer switch, but if you don't transfer the neutral, you must disconnect the internal neutral to frame or ground connection at the generator. In most small residential use generators this connection is not easily removed.
In the manufactured generator transfer switches with the 4, 6, 10 etc.. circuit capabilities that are commonly used in residential applications, I do not believe the Neutral wire is switched. There is 1 neutral wire that gets connected to the Neutral bar in the Panelboard and that is shared by all when the generator is in use.
If the Neutral is not bonded to the Generator frame you will get voltage fluctuations on 120v circuits being fed by the generator unless both legs are perfectly Balanced. The first time I saw this I called the Generator manufacturer and was told to open the Generator and bond the Neutral to the frame.