Cable Calcs

Steve D · May 1, 2009

Hi All,

I'm rewiring a garage. There is SWA into the garage and I intend to fit a new RCD protected garage CU with 16A & 6A breakers.
Would you recommend putting a 25A or 32A breaker in the main CU ?

I haven't inspected site properly yet but I just had a thought with respect to the existing SWA cable sizing which is currently buried. Am I right to assume that the cable needs to be sized in accordance with the size of the CU fuse? Therefore a 32A breaker at the CU demands that the cable is capable of carrying minimum 32A ?

Excuse my ignorance but I'm never really worked with SWA in the real world before, so what is the difference between tables 4D4A 70C armoured thermoplastic and 4E4A 90C armoured thermosetting? I've got a note in my regs to generally use table 4E4A but naively, I don't really know have to identify what type of SWA exists.
Will there be some sort of code on the external of the cable for me to identify ?

Cheers
Steve

kung · May 3, 2009

Jason.S said:
earth tags...

Thats it Jason deliverance dueling earth tags !

scotsparky · May 3, 2009

The origional

When you want genuine music - music that will come right home to you like a bad quarter, suffuse your system like strychnine whiskey, go right through you like Brandreth's pills, ramify your whole constitution like the measles, and break out on your hide like the pinfeather pimples on a picked goose - when you want all this, just smash your piano, and invoke the glory-beaming banjo! - Mark Twain

The PC

When you want genuine music - music that will come right home to you like a bad quarter, suffuse your system like strychnine whiskey, go right through you like Brandreth's pills, ramify your whole constitution like the measles, and break out on your hide like the pinfeather pimples on a picked goose - when you want all this, just smash your piano, and invoke the glory-beaming earth tag! - Mark Twain

Not got the same ring to it has it?

Guest123 · May 3, 2009

bonjovi · May 3, 2009

on the site im on alot of the people are from sheffield and they call the banjos monacles as in the single eye glass a bit strange but thats what they grew up calling em

Spudnik · May 3, 2009

bonjovi said:
on the site im on alot of the people are from sheffield and they call the banjos monacles as in the single eye glass a bit strange but thats what they grew up calling em

Sounds good to me, however, im sure the slightly sight impaired may take a dim view.

Anyway, how the hell did we get onto "earth tags" from cable calcs??