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Letting the builder run the cable is stupid, and I certainly wouldn't entertain that.

Can't be too thorough at that price. You should be looking at £350 for the inspection, testing and Report (NOT certificate).

It has always been known as Type B, Type C and Type D for circuit breakers.

That's entirely a matter for the inspecting Electrician, although what is connected to it may be a major factor in that judgement.

You would need to change a module to an intermediate for what you want to work. Frankly it would be a daft thing to do.

The fact they refer to "diameter" of cable instantly brings the advice into question.

Which manufacturer?

RCD or RCCB is technically incorrect. An RCCB is a type of RCD. An RCBO is also a type of RCD.

There is still a cost. It's not simply the extra cable length, but also the extra labour this involves which is charged. (Excuse the pun.) And as pointed out, no reputable contractor will utilise cable which you have supplied.

I certainly wouldn't entertain using cable supplied by a customer. They are always told "no chance" when they ask, as I cannot possibly guarantee its quality or even whether it is a legitimate product, let alone specs e.g. reactance to fire. (Dca, -s2, d2, a2 being the minimum permissible grade...

The superior National Rules for Electrical Installations in the south of Ireland actually do have an explicit requirement for it, and rightly so.

"Rock solid" yet fluctuates... But you can't seriously be claiming that it only ever fluctuates within 2V. Complete horseshit if I'm honest.

Far rmore usually near the 230V mark here. Can be down towards 220V in some places; up towards 250V in others. Also fluctuates at different times. It's a nominal voltage for a reason. It's never constant.

230V for quite a number of years now.

Assuming it's not a 2-way switch then it will make no difference to whether it's switched "on" or "off" which terminals the conductors are connected into.

No - you must remove the erroneous connections between the circuits. Putting them on the same RCCB doesn't remove the danger.

In fairness very, very few existing DBs would be suitable, and they would also be unlikely to stock all different types/makes of protective device. Many brands don't have double pole switching RCBOs in a single module, which will rule many boards out.

No, but they can refuse to install unless it meets their own particular requirements.

Wrong way round. PME is one type of TN-C-S system.

RCCB for £10? £80 all in? That's no Electrician. Even a handyman would be dearer. And no-one can find an RCCB for a tenner.