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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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    broadgage:

    Contrary to a widely held belief, an RCD still gives some protection on systems with no CPC or on systems with neither of the supply wires earthed. (as with many inverters and small generators)

    Most dangerous electric shocks are a result of current passing through the body from a live conductor to the general mass of earth or to articles connected thereto. Any current through the body of the victim is not returning to the source via the other circuit conductor, and would therefore operate an RCD regardless of what if any earthing arrangements exist. 




    "systems with neither of the supply wires earthed" Have I misunderstood that bit? Yes without a cpc you`d still get an RCD to work for earth fault protection but if neither of the supply wires were earth referenced the RCD would not trip on earth fault, there would be no earth path therefore no danger , example bathroom shaver socket or isolating transformer

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  • 0

    broadgage:

    Contrary to a widely held belief, an RCD still gives some protection on systems with no CPC or on systems with neither of the supply wires earthed. (as with many inverters and small generators)

    Most dangerous electric shocks are a result of current passing through the body from a live conductor to the general mass of earth or to articles connected thereto. Any current through the body of the victim is not returning to the source via the other circuit conductor, and would therefore operate an RCD regardless of what if any earthing arrangements exist. 




    "systems with neither of the supply wires earthed" Have I misunderstood that bit? Yes without a cpc you`d still get an RCD to work for earth fault protection but if neither of the supply wires were earth referenced the RCD would not trip on earth fault, there would be no earth path therefore no danger , example bathroom shaver socket or isolating transformer

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