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    jjdd11's Avatar
    jjdd11 Posts: 3, Reputation: 1
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    #1

    Jul 10, 2012, 02:27 PM
    Electrical
    In an electrical installation should the circuit breaker automatically trip when hot and neutral touch or only when hot and ground touch?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Jul 10, 2012, 02:46 PM
    100% current flow between hot and neutral or ground will trip a breaker. That's because the current flow will exceed the ampacity of the breaker. You always need something in between-lights, motor, heater etc. In older panels, ground and neutral were conneced to the same bar so it didn't make any difference, any contact would trip the breaker.
    jjdd11's Avatar
    jjdd11 Posts: 3, Reputation: 1
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    #3

    Jul 10, 2012, 03:03 PM
    Quote Originally Posted by ma0641 View Post
    100% current flow between hot and neutral or ground will trip a breaker. Thats because the current flow will exceed the ampacity of the breaker. You always need something in between-lights, motor, heater etc. In older panels, ground and neutral were conneced to the same bar so it didn't make any difference, any contact would trip the breaker.
    Thank you for your help
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