i need help

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please help me i need to find out some research for my science exsperiment i am doing this question: if you use an underground circut breaker amprage in a house circut will it make a difference or not????????? if so why? email me back please i could really use your help. i am in 7 th grade and was told to do something scientific. and this intrests me. and it seems u know alot. so please help me!:-)

Thanks alot,
Bethany Freeman