Once I completed the basic electrical installation detailed in my previous post I began to look into the other elements of installing mains electricity in a vehicle. I figured there had to be a reason for consumer units, RCDs and all the other stuff - otherwise everyone would just wire a socket to a cable and call it an installation.So I have spent the remainder of today researching consumer units and associated technology and I learned a lot.
Doesn't look complicated at all!
I had been working on the basis that any electrical outlet, including the one in my garage and those on campsites, would be fused and protected and that this protection would be sufficient. However, unless I inspect the electrical installation of every location I connect to I have no way of knowing how 'protected' they are. Also the protection needs to be appropriate to the device connected. This is why circuit breakers in consumer units have different ratings.
What I don't want to happen.
Having worked out that I absolutely have to have some additional protection, I had to work out what I need. So the first place I looked was on camping supply websites. The most popular unit being sold was a unit containing an RCD, a 16Amp MCB and a 6Amp MCB. A little research on various other sites taught me that the RCD detects differences in the current passing through the device in each direction and breaks the circuit if the difference is over a specified amount (30mA seemed a popular amount).
MCBs are miniature circuit breakers which break the circuit either if too much current is being drawn or the switch is thrown manually. The 16A MCB is designed to protect the mains sockets, the 6Amp protects the lighting circuit. This very informative video explains how an MCB works.
So there is little point me relying on a 16A MCB to protect a 6A lighting circuit which would clearly fry before the current reached anywhere near blowing the MCB.
It took me a while to find an accurate wiring diagram - it seems that the experts are hesitant to provide this kind of information, perhaps understandably - but after looking at a few images and watching a few videos, I am now completely confident that I can safely and accurately wire up a consumer unit.
The prices I have seen range from £5.00 for a used one (that looks like it might have been on fire at some point) up to £47.00. These have all been the same type, with an RCD and two MCBs. I have settled on £16.00 which gets me a new unit with the right MCBs.
This is what I have ordered, £16.28 including two MCBs of my choosing.
This means that I should have a fully operational and safely protected electrical installation in time for my camping trip in June - only 5 weeks until the Speedway World Cup in Kings Lynn.
Note: Again this isn't a 'how-to', it's a 'how-I'm-going-to'. If I get it wrong, it's my fault. If you copy anything here and get it wrong then it's yours. #justsaying
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