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DC LV Battery Power Supply for Motorhome

TrigPoint
Hi everyone!


I've been asked to install some wiring in a van conversion and I need a bit of advice. The plan is a 110Ah 12V leisure battery, a SELV system and TT earthing (earth electrode from the body of the van.) 


I'm trying to work out the PSCC and PFC so I can choose the overcurrent and fault protection.


So,


a) Is measuring the impedance of the battery and using Uo Cmax / Zs 2R1 (with the measured battery impedance as Zs) acceptable to calculate PSCC


and,


b) Is Uo/Ze (with measured the battery impedance as Ze) acceptable to calculate PFC?


Many thanks in advance for your answers.


Trig


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    one side of the supply is inadvertently earthed, perhaps by cumulative leakage currents, or by a pre-existing earth fault. In this case a dangerous current could pass through the victim, perhaps with fatal results. A working RCD will trip and avoid this danger.




    No. Cumulative leakage currents will earth the supply on the load side of the rcd. A fault on the other Load conductor will not be seen by it, as there is no imbalance. For an rcd to be of any use, it needs one of its supply conductors earthing, not a load conductor. 


    Regards,


    Alan. 

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  • 0

    one side of the supply is inadvertently earthed, perhaps by cumulative leakage currents, or by a pre-existing earth fault. In this case a dangerous current could pass through the victim, perhaps with fatal results. A working RCD will trip and avoid this danger.




    No. Cumulative leakage currents will earth the supply on the load side of the rcd. A fault on the other Load conductor will not be seen by it, as there is no imbalance. For an rcd to be of any use, it needs one of its supply conductors earthing, not a load conductor. 


    Regards,


    Alan. 

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