Help with Basic Electrical Hook up Wiring (1 Viewer)

[ChrisA1]

I'm new here, so hi everyone!

I'm looking for some advice. I've just taken on a van to motorhome conversion and need some advice on the electrics.

It's on the very basics, and I'm sure it's bread and butter to everyone else, but what goes where in the consumer unit on a hook up? I've got the wire direct from the hook up and then 2 from 2 plug sockets and that's it.

I've tried searching on Google but can't find anything that's clear enough.

Photos in link attached. https://photos.app.goo.gl/eoe86rHPGPQ3muRx8

Thanks in advance!

 

[autorouter]

The present consumer unit is neither suitable, without electrical knowledge, or large enough for double pole MCBs.

Some double pole MCBs are double the width of single pole ones, but it's just as easy to buy ones with the same width, so the size of the consumer unit is not a problem. It's a British one, with a neutral busbar that can be just ignored.

 

[pappajohn]

if you have an EHU supply which is reverse polarity. This is not uncommon to find.

It will be in this country.
If something happened the campsite had better have very good insurance.

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[pappajohn]

Some double pole MCBs are double the width of single pole ones, but it's just as easy to buy ones with the same width, so the size of the consumer unit is not a problem

It's not the width I was referring to.... The double pole are deeper back to front to accommodate the extra circuit so the cover would have to be left off.

 

[autorouter]

RCD = Residual Current Device. Senses the difference between the outgoing and returning current flow, and trips if it exceeds 30mA. Protects against electric shock. Does not protect against excessive current flow. It needs two poles, live and neutral, to work. The RCD is the one with the 'test' button.

MCB = Miniature Circuit Breaker. Protects against excessive current flow (amps). It has two protection mechanisms: magnetic for sudden large current surges and thermal for slow current buildup. Does not protect against electric shock. Single Pole (SP) protects just one pole. Single Pole and Neutral (SP+N) protects one pole but switches both poles off. Double Pole (DP) protects both poles.

RCBO = Residual Current Breaker with Overload. Combines the functions of an RCD and an MCB. More expensive than the two separately.

RCB = a typing error

Edit. An RCBO is sometimes called an RCCB (Residual Current Circuit Breaker)

 

[autorouter]

t's not the width I was referring to.... The double pole are deeper back to front to accommodate the extra circuit so the cover would have to be left off.

The ones I have, bought in a standard German DIY store, are the same size as single pole ones.

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[Spriddler]

Double pole MCBs seem to be difficult to find in the UK. You may have to go to a specialist electrical supplier, or buy online. I've never seen them in any DIY store in the UK.

Perhaps that's because there's no risk of reverse polarity when inserting 'our' 3 pin 13A plugs, unlike the two pin (reversible) continental plugs......

 

[Spriddler]

If you look at the RCD in question you will see that it has two connections (poles) shown arrowed red (live and neutral), whereas the MCBs only one each (arrowed white).

 

[autorouter]

The RCD will protect against electric shock, so fishing inside the toaster with a metal knife will not kill anyone, even if the polarity is reversed.

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[DBK]

All RCDs are double pole. It's the MCBs that are single pole in the pictures, and I think should be double pole. Sorry to pick you up on terminology, but in this case it's the central issue.

My apologies, I thought at first glance they were RCDs but I see there is no press to test button which I guess is the easiest way to spot them.

 

[hilldweller]

Just for the record, our Swift Sargent unit has 40A RCD plus 3 10A breakers.

 

[autorouter]

There are no single-pole RCDs. They are all double pole. They protect against electric shock. The RCD is the one with the 'test' button.

MCBs are a different matter. You have a choice of MCB types: Single Pole, Single Pole and Neutral and Double Pole. A single pole MCB will not cut off the live if the polarity is reversed. Some people, me included, think that is a risk. That's why I have double pole MCBs. Others just rely on the RCD to protect you whether the MCBs are single or double pole. I must admit the risk is quite small if you have a proper RCD fitted.

The reverse polarity issue was much more important in the days before RCDs. There are still many older motorhomes without an RCD, but for modern properly wired motorhomes the risk is extremely small.

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[SurferBuzz]

I'm now fitting the consumer unit for my self-build.

I’ve searched a number of self-build forums and the whole single pole v’s double pole topic is a hotly debated one.
I’m falling on the side of caution, more protection is better than less, but I'm struggling to find MK double poled MCBs at a reasonable price (under £20)

Although, common sense dictates to me that regardless of where I am in the world, should I encounter an electrical issue the first thing I would do would be to remove the hookup, DP MCBs or not.