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Lost Neutral

Former Community Member
Former Community Member
What would be the expected result of a disconnected neutral on a TN-S mains supply into a building?
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  • 0
    Sub-circuit protection did not operate. Can anyone advise why not?

    Most circuit protection is based on overcurrent rather than overvoltage. While an increased voltage will often result in an increased current current being drawn - the increased current would typically be in proportion to the increase in voltage - i.e. a factor of probably less than 2 - i.e. it would appear to the protective device to be at worst a moderate overload rather than a fault - so even where the protective device's rating is close to the normal rating of the load disconnection time would likely be many minutes or hours rather than seconds. In the more likely case where there's a decent margin between the rating of the circuit and the connected load, chances are the current will never reach a level to trigger overcurrent protection.

       - Andy.
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  • 0
    Sub-circuit protection did not operate. Can anyone advise why not?

    Most circuit protection is based on overcurrent rather than overvoltage. While an increased voltage will often result in an increased current current being drawn - the increased current would typically be in proportion to the increase in voltage - i.e. a factor of probably less than 2 - i.e. it would appear to the protective device to be at worst a moderate overload rather than a fault - so even where the protective device's rating is close to the normal rating of the load disconnection time would likely be many minutes or hours rather than seconds. In the more likely case where there's a decent margin between the rating of the circuit and the connected load, chances are the current will never reach a level to trigger overcurrent protection.

       - Andy.
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