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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
    Yep. In a nutshell RCD protection will only afford earth leakage protection if the earth return is to the supply side of the of any RCD rather than load side ie load thru RCD current coils imbalance. That`s how I check my RCD tester from an RCD protecteded supply L & N to supply the test socket connects L supply to L socket, N to Socket N and N also to socket E. The socket being a BS7288 trips and is timed by the RCD function of my MFT but leaves the supply (Domestic RCD protected)  untripped.
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  • 0
    Yep. In a nutshell RCD protection will only afford earth leakage protection if the earth return is to the supply side of the of any RCD rather than load side ie load thru RCD current coils imbalance. That`s how I check my RCD tester from an RCD protecteded supply L & N to supply the test socket connects L supply to L socket, N to Socket N and N also to socket E. The socket being a BS7288 trips and is timed by the RCD function of my MFT but leaves the supply (Domestic RCD protected)  untripped.
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