Re: John T,,

Posted by Gerald J. on September 22, 2006 at 07:28:00 from (67.0.102.134):

In Reply to: John T,, posted by ChadS on September 22, 2006 at 06:50:36:

If the breaker on the pole trips at 45 amps, its damaged.

Whether a marginally larger breaker can be put in the box depends on the maker and part number for the box. Some makes can, some can't. Often the lowest bid box is compact and doesn't have room for bending larger conductors into place. And that problem is made worse by using aluminum wire since copper is probably not affordable these days.

Electrically, running a separate line from the pole (with its own breaker) for the furnace would work but I don't think its NEC approved because it would be safer for the house to have only one disconnect. And at the pole the power company needs to have 200 amp meter loop and enough transformer to support that load.

Having larger wires will get more of the energy you pay for to the house instead of warming outdoors with power lost in the wires and for thermostatically controlled loads like furnace, oven, and water heater may reduce the energy costs a couple percent. But not enough that you can prove it in the noise of variations in use brought about by weather.

The minimum wire size needed depends on the length of the service run, but there's nothing wrong with going a size larger if it will fit the conduit and the lugs on the breakers and you can afford it.

Gerald J, electrical engineer

Replies:

• Re: John T,, ChadS 10:18:57 09/22/06 (2)
  • Re: John T,, John M 14:15:33 09/22/06 (0)
  • Re: John T,, Gerald J. 10:45:59 09/22/06 (0)
• Re: John T,, John T 08:15:27 09/22/06 (0)

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