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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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  • 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. "


    Yes indeed but you did say neither side was earthed, whereas it would in fact have an earth reference allbeit unintentional. Was my point
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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. "


    Yes indeed but you did say neither side was earthed, whereas it would in fact have an earth reference allbeit unintentional. Was my point
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