#151173  by SimonAKL
 Tue May 07, 2019 12:50 pm
Do I need to get 12V electrics certified?
Trying to decide if a hookup is worth the cost and hassle of certification. My choice (and understanding of the implications) is:
(1) I forget hookup entirely and use solar 12V only - no certification needed I think?
(2) If I want to use a battery charger to keep my 12V Aux battery topped up I need to get a 240V hookup connection on the van, and a 240v plug on the other side for the ctek to plug into - and those are the only bits that need certification (not the whole 12V system, although it is now 'conencted' to the 240V system)?
Is that right?
 #151178  by mattn
 Tue May 07, 2019 1:55 pm
Covered here.... viewtopic.php?t=18115

The question about the connection of the 12V to the mains though the charger is a bit trickier to answer legally. Practically no one I know has every taken that approach in the RV segment (Although I have read reports about EWoF covering boats 12V systems). If the charger is connected to the mains by a plug, it becomes and appliance, not a part of the fixed wiring, how is it different to a lap top charger outputing 20V to a laptop and charging the laptop battery. In this case its would not be covered by the EWoF, so the 12V system it connects to is not either. If the battery charger is permanently wired to both the 12V system and the mains system, that could (I have no idea if it does or not) make the 12V PEW.

A simple solution if you are worried is install a plug for the charger to plug into on one or both the 12V and 240V cicuits.
 #151181  by SimonAKL
 Tue May 07, 2019 2:30 pm
Thanks Matt, will check out that thread (it didnt come up with the search terms I could think of before!)

To clarify, the charger just takes power from the mains and sends it to the 12v battery. So you might be right about the laptop analogy - the difference would be that the 12v system is wired into the van permanently whereas the laptop is not, but that doesnt seem to matter anyway accordint to that thread. It says the only requirement of the 12v circuit is that 'It needs to pass a 500vdc resistance test between the active and each unearthed ELV circuit, so resistance is not less than 1ohm' ... In other words, 12v circuits earthed to the chassis don't require this.

Which begs the question - why would you NOT earth a 12V circuit to the chassis?
 #151182  by mattn
 Tue May 07, 2019 2:42 pm
You presume you have a chassis to earth to - Many caravans and house bodies of many motor homes don't have a metal chassis to speak of so require twin wires to fittings.
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