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sub-DB reading higher than feeder DB

Former Community Member
Former Community Member

Hi,  I have a main distribution board which feeds into a sub-distribution board.  This sub board then feeds into two buildings.  Via a cable into the one building and also via a cable into another distribution board in the second building. What is puzzling me is that the distribution board in the second building shows a higher consumption than the main board which supplies it.  Does anyone have an idea how this could be possible? Thanks very much, Nick

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  • Former Community Member
    0 Former Community Member
    Thank you for your reply.  I will answer what questions I can.  I am not an electrician - I am staying in a house with an outbuilding - the main house supplying the outbuilding. 


    The main house DB feeds into a sub-DB and both are housed together in one box.  The sub-DB then feeds into another DB housed in the outbuilding about 4m away.


    All DBs measure in kilowatts but I don't know which type or phases they are.  I am not sure what "true consumption" is so I can't tell you that, I'm afraid.  The interval between readings is very short so that can't be a factor.


    It is really odd because the main DB feeds another building as well - if I took this in to account the discrepancy would be even greater.  Also the consumption calculated for the main DB was for one day less than that for the outbuilding board.  All in all, the main DB reading should be significantly higher than the outbuilding DB.


    Thanks again,

    Nick
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  • Former Community Member
    0 Former Community Member
    Thank you for your reply.  I will answer what questions I can.  I am not an electrician - I am staying in a house with an outbuilding - the main house supplying the outbuilding. 


    The main house DB feeds into a sub-DB and both are housed together in one box.  The sub-DB then feeds into another DB housed in the outbuilding about 4m away.


    All DBs measure in kilowatts but I don't know which type or phases they are.  I am not sure what "true consumption" is so I can't tell you that, I'm afraid.  The interval between readings is very short so that can't be a factor.


    It is really odd because the main DB feeds another building as well - if I took this in to account the discrepancy would be even greater.  Also the consumption calculated for the main DB was for one day less than that for the outbuilding board.  All in all, the main DB reading should be significantly higher than the outbuilding DB.


    Thanks again,

    Nick
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