Gen disconnect

Old 10-17-02, 09:57 AM
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Gen disconnect

When you use a disconect switch to isolate the system for hooking generater on to premisis wiring (single phase) do they use a 2 pole switch or a 3 pole and disconnect the neutral also. Seems to me I saw one and it look like a double pole double thro. Just curious, was thinking abut it from the generator post.

Last edited by sberry27; 10-17-02 at 10:17 AM.
Old 10-17-02, 10:50 AM
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Grounded Conductor / To transfer or not

That will depend on the type of generator that is to be installed. If the generator is to be permanently installed then the answer is governed by the bonding of the neutral at the generator.

If the neutral is bonded at the generator then you transfer the neutral in the transfer switch. This is done to avoid having two connections to ground on the neutral at both the service equipment and the frame of the generator.

If the neutral is not bonded to the frame of the generator then you do not transfer the neutral so that the generator's neutral will be grounded by the main bonding jumper in the home's service disconnecting means.

A power inlet for a portable generator is done the same way in that a four wire with ground inlet, such as the L14-XX 120/240, is wired to a two pole transfer mechanism. A three wire without ground inlet, such as a L11-XX is wired to a three pole transfer device. In general three pole transfer devices are only available as switches.

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