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Fuses can't trip! They rupture.

ESP GuardCam Deco.

It's not always the line, but a logical explanation would of course be a loose connection between the fuse and carrier.

No need to apologise. I've done jobs in Sligo before, but like you I agree it's too far for most things. About a two hour drive to Sligo Town from here.

It would hardly align with their obligations in respect of IEC/CENELEC either, so couldn't actually be done anyway.

Now you'll be able to perform a proper manly loop impedance test where no RCDs are present.

I'm just looking out for you. I like you too much Andy From Sligo to see you doing hard labour.

Better than spending a few years in gaol. (Or even longer in the graveyard.)

It also can't be PVC insulation, bedding or sheath.

Indeed. Better yet, he could get his Electrician to source the proper cable.

You may be surprised to learn that they claim nowhere near the measurement accuracy which many seem to assume. They are more indicative.

Perhaps it's not Electricians that it's intended to protect.

It doesn't, because even the instrument manufacturers will state unequivocally that high current loop testing is the preferred means where possible.

Clearly it's a safety requirement, irrespective of individual views of the need for or wisdom of the Rule.

Brown & Earth from the luminaire. Twin brown between switches. Single brown from last switch to luminaire switched phase connection. Other methods are of course possible.

Well then I would dispute their logic. I wouldn't even entertain a low trip setting on non-RCD protected wiring.

No. Logic tells us that 2 wire high current testing is always the better measurement to utilise. Low current loop testing is simply a compromise due to the use of residual current devices.

The conversion method isn't common here. Conventional two-way (and intermediate) switching is generally employed.

No. The fan would require a neutral. You could use twin brown with an insulated and sheathed single blue, but that would be less logical than a brown & blue with insulated and sheathed single brown.

One option is a T&E alongside an insulated and sheathed single brown. (I won't use the term "PVC/PVC" as PVC cables are actually prohibited for the past few years. The minimum cable requirement is Dca, -s2, d2, a2.) For smoke/CO detectors we actually have a specialist cable now called "RD415".