Re: O.T. Wiring help in SW MO

Posted by John T on March 16, 2006 at 15:49:24 from (66.244.90.98):

In Reply to: O.T. Wiring help in SW MO posted by Play farmer on March 16, 2006 at 15:27:08:

Farmer, In Mobile Home services where they require FOUR wires from the service to the panelboard located inside the Mobile Home, the 4 wires are made up of:

Two Hot Phase Conductors (L1 and L2)

One Neutral (a grounded conductor)

One Equipment Ground (a grounding conductor)

Then inside the Panel, the Neutral Buss (for the white branch circuit return conductors) and the Equipment Ground Buss (green safety wire grounds)
MUST BE ISOLATED AND NOTTTTTT TIED TOGETHER.

If it were a residential service entrance main panelboard like the ones inside the residence (NOT a pole or pad mount service used to feed Mobile Homes) the Neutral Buss and the Equipment Ground Buss WOULD BE BONDED TOGETHER AT THE MAIN PANEL but NOTTTTTTTTT in the 4 wire MH Panel.

Thats why panels for Mobile Homes or panels used as sub panels MUST HAVE SEPERABLE NEUTRAL AND GROUND BUSSES.

Soooooooooooo, run 4 wires (L1, L2, Neutral, Ground) from the pole to the main panel inside the Mobile Home and attach the L1 and L2 to the Main Circuit Breaker top, the Neutral (white) to the Neutral Buss and the Ground (Green) to the Ground Buss. The metallic panel enclosure would be bonded to the equipment ground buss, often via a svrew that goes from the bus to the metal enclosure.

The Neutral is earth grounded via connection to a made ground (a grounding electrode such as a driven ground rod) at the outside service, and from that point on the Neutral and Grounds are no longer bonded, thats why you need 4 not 3 wires from the service to the Mobile Home versus only 3 on residential services.

John T Nordhoff in Indiana, retired Electrical Engineer)

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