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Good Morning Fleeting, I did think this, hence my original thought to isolate the circuit for now, but when doubting my Friday afternoon clarity of thought a discussion with some other wiser (?) colleagues lead to advice to treat the heater as a fixed resistive load....but as you say, if there...

Thanks binky....the 13A fused switch had definite signs of overheating (running at close to 13A for close to 10 hours a day) but had not melted as I've often seen when an immersion heater has been wired through a FS, so I would definitely want to swap out for a 20A switch. If we are saying that...

Good Morning All. Emergency call to local charity shop yesterday due to "no heating". 3 x 3kW "curtain heaters" on site, 4 of these on individual 16a MCB with 2.5mm T+E to 20A control switch...happy days, replace damaged control switch for 2 of these which had been damaged by being knocked...

Thank you all for your swift replies....landing it is to start with then...I have the ferret cam on standby! I'll let you know how it goes!

Good morning all. Would appreciate your thoughts on the following. Call out yesterday to 1970's domestic property with 50% of ground floor lights not working, no MCB trip (lights not RCD protected). I was hoping for a relatively straightforward binary search, checking at ceiling roses for a...

Thanks Fleeting.....and that's why I come on the site....sometimes the answer is staring you right in the face but you're so close you can't see it without someone else pointing it out!

I believe the 0.05Ω figure comes from GN8. I take your point regarding the isolation / parallel paths. Question remains whether my continuity measurement of 0.22Ω is sufficiently low to consider it "evidence" of a hidden MPB to the structural steel, or whether I should indeed be recommending...

EICR on commercial premises approx 8 yrs old. Structural steel is confirmed by test as extraneous conductive part. No EIC / paperwork available. MPB to gas / water services confirmed visually and by measurement - 1 continuous conductor serves both. Unable to visually locate MPB to structural...