08:24PM | 09/27/07
Member Since: 09/27/07
1 lifetime posts
Last fall I had my oil furnace replaced with a new electric forced air furnace in my 1985 manufactured double wide home. There is a 200 amp service box inside the home that was built with the home. New wiring was installed from the breaker box to the new furnace when it was installed.

Durring the winter when the furnace was running and the electric dryer at the same time, the breaker OUTSIDE on the pole would trip. I believe it is a 100 amp breaker in that box. I was told by the electric company that the wire from the meter up to the top of the pole needs to be replaced with 200 amp wire. The electrician says that the wires from the meter that go down underground and then into the house also need replaced because the wire may not be heavy enough and may get hot. Is this true? even though the breaker box in the house says on the tag that it is a 200 amp service box and there are two rows of breakers.


09:18PM | 09/27/07
Member Since: 01/09/07
198 lifetime posts
Just because they installed a 200A breaker box, does NOT mean they actually provided wires for a 200A feed to it.

In your case, it appears they did not. The breaker on the pole is 100A, so presumably the wires from there to the meter are sized for only 100A. And probably the underground wires from the meter to the breaker box are also 100A; there would be no sense making them bigger when the pole only supplies 100A.

Presumably, when it was built (without an electric furnace), they felt 100A was enough for the house. That's no longer true, so you need to upgrade the service.

Probably, the electrician is right. You will need to upgrade the wires all the way from the pole to the breaker box inside the house. (But you are lucky in already having a 200A breaker box; you will save a lot of money by not needing to do any upgrading there.) Note that in many cases, the electric company may have to pay for the work up to the meter; you pay for the work beyond it.

If you can post here the wire sizes (marked on the wires) of the wires coming into the meter for the pole, and those of the wires going from the meter into the breaker box, we can tell you the maximum load they can carry. We'll also need to know the approximate distances involved.
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