Does that not mean that concealed (mechanical) joints in conduit are also not allowed, if that conduit is being used as a CPC?
No, they're permitted
Max load on a 1mm T&E cable
- Thread starter iep
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No, they're permitted
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If you say soNo, they're permittedDoes that not mean that concealed (mechanical) joints in conduit are also not allowed, if that conduit is being used as a CPC?
Kind Regards, John
As per question about RCBO. Yes, it's a dedicated 2.5mm cable going back to a dedicated 16A RCBO (only feeds UFH). No real room for confusion.
Conduit is al indoors (in kitchen) so no real likelyhood of corrosion. That said, I like belt and braces so might well see about squeezing in a dedicated earth cable too.
Cheers,
iep
Conduit is al indoors (in kitchen) so no real likelyhood of corrosion. That said, I like belt and braces so might well see about squeezing in a dedicated earth cable too.
Cheers,
iep
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Possibly, I have not thought about that. But IME, a cpc is run inside metal conduit anyway, to avoid the problem of high-resistance joints causing poor cpc continuity.
.."have not thought about" what? (the lack of a quote leaves me guessing
). You seem to be saying exactly the same as me.Kind Regards, John
Had to get the green regs out when I got to the office this morning
You didn't trust what I told you yesterday? - at least you presumably now believe me!Had to get the green regs out when I got to the office this morning
It remains very difficult to understand why on earth they made this change, particularly given the lack of definitions and confusion caused by 'mixed circuits'. As I wrote yesterday, it seems irrational that (I presume) a dedicated circuit for a bell transformer needs 1.5mm², whereas (all other thinkg being equal) a 2kW 'lighting circuit' could be wired in 1mm²
Kind Regards, John
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.."have not thought about" what? (the lack of a quote leaves me guessing
Kind Regards, John
Don't know where the quote wented (
) but you can guess from the content wot I'm on about.
Why the massive difference in CSA between copper and aluminium
16 to 1 in sheathed cable but only 1.6 to 1 in bare cables.
I assume it is to do with the sheathing providing thermal insulation and aluminium's higher resistance creating more heating than copper would for the same current density. ( amps per mm ² )
16 to 1 in sheathed cable but only 1.6 to 1 in bare cables.
I assume it is to do with the sheathing providing thermal insulation and aluminium's higher resistance creating more heating than copper would for the same current density. ( amps per mm ² )
I've often wondered that. I am inclined to suspect that, rather than having a 'reasoned' basis such as you suggest, it may well just be that the different ratios arise from the fact that, for whatever reason, they have decided that the minimum permitted CSA of aluminium conductors in any situation is 16mm². Having said that, to be talking about circuits with bare live conductors of any size, these Tables must have at least partially in mind installations very different from standard domestic or commercial ones - so I'm probably out of my depth!
Kind Regards, John
You didn't trust what I told you yesterday? - at least you presumably now believe me!Had to get the green regs out when I got to the office this morning
Kind Regards, John
No, I just wanted to see it in black and white, and thought others might too
Fair enough - as you say, others might be interested. As for myself, I obviously did see it (both versions) 'in black and white' yesterday, since I was quoting from them for you!No, I just wanted to see it in black and white, and thought others might tooYou didn't trust what I told you yesterday? - at least you presumably now believe me!
Kind Regards, John
Edit: format corrected
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