So I've just been reading through the electricians guide to the building regulations for my own knowledge and have come across 2 regulations which I need help on clarifying...
page 80 5.5.2 (e) mentions cables should need to withstand a temperature of 170 degrees C.
Q. now why on earth would a cable need to withstand that temperature if a human cannot even with stand that temperature? Also what kind of cable would that be then? When I checked the specs / data sheet of fp200 it only comes up with operating temp which is 70.
page 82 5.7.3 supplies to outbuildings mentions if an armoured cables supplies an outbuilding such as a shed or garage, care must be taken to only connected the armouring is not connected to the outbuilding terminals, it must be connected to the MAIN buildings earthing terminal.
Q. so what do you do with the armouring of the swa when on the outbuilding side? it seams like bad practice not to earth it to the fuse board. Does that also mean you just run a 2 core swa rather than a 3 core swa for single phase? as surely they wont want the earthing from the main building to connect with the outbuilding? are you supposed to provide the earthing only by a TT earth rod ground installation only?
I am still learning so don't kane me lol
Thanks for any answers!
page 80 5.5.2 (e) mentions cables should need to withstand a temperature of 170 degrees C.
Q. now why on earth would a cable need to withstand that temperature if a human cannot even with stand that temperature? Also what kind of cable would that be then? When I checked the specs / data sheet of fp200 it only comes up with operating temp which is 70.
page 82 5.7.3 supplies to outbuildings mentions if an armoured cables supplies an outbuilding such as a shed or garage, care must be taken to only connected the armouring is not connected to the outbuilding terminals, it must be connected to the MAIN buildings earthing terminal.
Q. so what do you do with the armouring of the swa when on the outbuilding side? it seams like bad practice not to earth it to the fuse board. Does that also mean you just run a 2 core swa rather than a 3 core swa for single phase? as surely they wont want the earthing from the main building to connect with the outbuilding? are you supposed to provide the earthing only by a TT earth rod ground installation only?
I am still learning so don't kane me lol
Thanks for any answers!