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because diy dave has got his big shiny drill out on a sunday!

with the power off, and he just happens to be using a metal drill bit rather than a masonry or wood drill bit?

and is going to just keep drilling despite the drill not going in like it should and sounding like it's hit something metal?
 
because diy dave has got his big shiny drill out on a sunday!

Which is unlikely to operate once he's turned all of the power off. Or if he's using a cordless then I doubt a DIY level cordless drill will be man enough to injure galv pipe.
But either way how many diyers actually switch off their whole house before drilling holes? All that will happen if they do is that it won't go bang when they drill through a cable but probably will when they turn it back on.
 
with the power off, and he just happens to be using a metal drill bit rather than a masonry or wood drill bit?

and is going to just keep drilling despite the drill not going in like it should and sounding like it's hit something metal?

I have to say there are a fair few who do just keep going after they've hit a buried bit of metal, carpenters are quite good at that trick too, along with plumbers and kitchen fitters
 
Thinking about it I've been guilty of the 'get the SDS out and give it some proper welly' approach when encountering resistance whilst drilling a hole. I wouldn't be surprised if most of us are!
 
besides, with the inverter off, even transformerless inverter circuits become protected by dint of being electrically separated.

Switch it back on and the insulation resistance test on start up should detect a damaged cable and not start up, so the circuit stays electrically separated until the fault's repaired.

At the end of the day, it's allowed under BS7671, and it's allowed because it's considered to be safe.
 
besides, with the inverter off, even transformerless inverter circuits become protected by dint of being electrically separated.

Switch it back on and the insulation resistance test on start up should detect a damaged cable and not start up, so the circuit stays electrically separated until the fault's repaired.

At the end of the day, it's allowed under BS7671, and it's allowed because it's considered to be safe.

and that is why i said IMO
 
why would the customer need to go into the loft to isolate it anyway.

if the inverter is in the loft just isolating the ac side will turn the inverter off.

the dc cables will always have potential on them unless the customer covers them on the roof or works at night lol
 

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