outside wiring

philkissMay 16, 2010

A house inspector looked at our wiring coming into the house and noted that 200 amps comes into the house from the street. The feed from the electric service off the street is 200 amps. The feed line into the electric circuit box is 100 amps. Could this set up cause a fire? If this is a problem, what steps should be taken? The electrical company found no problem with the #4 aluminum triplex wire to the house.

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spencer_electrician

As long as your main breaker panel is sized at 100 amps, it is fine. Check the main breaker. The power company may of just ran larger wire in-case your house is upgraded to 200 amps.

    Bookmark   May 16, 2010 at 7:41PM
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Billl

Just to clarify, all the wiring in your house should be protected by a breaker. The breaker should be sized so that it trips if the current goes above what the wiring can handle. In your case, if you have a wire that can handle 100 amp and a breaker that trips at 100 amp, then it is perfectly safe. If you have wiring that can handle 100 amp and the breaker isn't going to trip until 200 amp, then it would be dangerous.

A slightly larger concern for a home buyer is that the service is only 100 amp. That is undersized by modern standards. If the house is older, it was probably perfectly reasonable at the time, but people have so many more electric appliances and electronics then they used to - microwave, toaster over, blender, coffee makers, toaster, dishwasher, disposal etc - and that is just in the kitchen. Depending on how your family lives, you may or may not need to upgrade the electrical.

    Bookmark   May 17, 2010 at 9:52AM
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kappstan

All good points. My new a/c needed an additional 60amps. so, 100amps [total] kind of tells me that you a>don't have an a/c or b> you have a very old a/c.

    Bookmark   May 22, 2010 at 9:57AM
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