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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
    If the extractor fan is 12 volts, then no RCD is needed.

    Mains voltage switches etc are generally fine on 12 or 24 volt nominal circuits. DC is indeed much more destructive of contacts than AC, but a general "rule of thumb" is that contacts in switches, relays, contactors and the like if intended for AC may be safely used on DC provided that the voltage is limited to about 10% of the AC rating.

    Would I use a standard light switch on 12 or 24 volts DC ? yes I would. But on 110 volt DC, no way.


    I would not normally use 13 amp sockets on 12 or 24 volt circuits, there is nothing directly electrically unsafe in so doing, but dangerous confusion might be spread. USA type mains plugs/sockets have become a de facto standard for 12 volts DC at up to about 15 amps.

    For 24 volts, BS 543 types are popular.
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  • 0
    If the extractor fan is 12 volts, then no RCD is needed.

    Mains voltage switches etc are generally fine on 12 or 24 volt nominal circuits. DC is indeed much more destructive of contacts than AC, but a general "rule of thumb" is that contacts in switches, relays, contactors and the like if intended for AC may be safely used on DC provided that the voltage is limited to about 10% of the AC rating.

    Would I use a standard light switch on 12 or 24 volts DC ? yes I would. But on 110 volt DC, no way.


    I would not normally use 13 amp sockets on 12 or 24 volt circuits, there is nothing directly electrically unsafe in so doing, but dangerous confusion might be spread. USA type mains plugs/sockets have become a de facto standard for 12 volts DC at up to about 15 amps.

    For 24 volts, BS 543 types are popular.
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