Electrical (domestic) problem
15 March 2013, 10:17 PM
#32
some electricians have pride in their work (like me) and others don't give a **** what it looks like, especially in a garage, so if you know roughly what you are doing, you will save money and have nice tidy wiring
why should a shower be on a 40A mcb?
also, with a 40A mcb, what cable size would you recommend?
Last edited by BoozyDave; 15 March 2013 at 10:18 PM.
19 March 2013, 04:06 PM
#33
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are you having a laugh?
a shower should have it's own mcb with rcd protection or rcbo. it should be 32a and 10mm cable
CharlySkunkWeed
its fusewire , not a flippin bomb !
i agree, if there is still a direct short, all that will happen when the fuse is inserted is it will blow and go bang
i also agree with little knowledge can be dangerous, if you haven't been trained, get someone that has
Les
19 March 2013, 09:24 PM
#34
I am actually highly amused by this thread.
With people telling what sizes should and should not be used.
It all comes down to your specific installation and requirementsn.
Sometimes a 10mm on a 32a is required. Sometimes 10mm on a 40a is acceptable. There is no hard and fast rule a shower has to be on a 32 or 40a rcbo etc. You have to design and calculate to your specific installation.
Jeez
With people telling what sizes should and should not be used.
It all comes down to your specific installation and requirementsn.
Sometimes a 10mm on a 32a is required. Sometimes 10mm on a 40a is acceptable. There is no hard and fast rule a shower has to be on a 32 or 40a rcbo etc. You have to design and calculate to your specific installation.
Jeez
19 March 2013, 09:38 PM
#35
what was my 'extremely rude comment'?
you stated that a shower would almost certainly be on the ring main, when, in most cases of a shower in a house, most are electric and need their own supply.
if my rude comment was 'are you having a laugh', then provide some info that backs up your statement of 'a shower would almost certainly be on the ring main' and if i am wrong i will apologise
electric is more dangerous than a lot of people think, incompetent people just join wires onto something and if it works they think they have done it right. also, you get the word of mouth stuff too, 'my mate used to know a sparky and he said it would be ok'.
i'm not trying to prove anything, just stating facts. if fitting an electric shower rated at 8.5/9.0kw- downstairs wet room or flat = 6mm and 32a MCB (10mm and 40a if 10.5kw), bungalow or house with loft insullation = 10mm and 32a MCB. the only way you can fit 10mm with a 40a MCB in a house is if the cable travels vertical through the loft insullation, clipped onto wooden battens across/around the loft and then vertical through the loft insullation to the pull switch and back up the same and then down to the shower. but, the maximum total for being in contact with insullation is 300mm, so maximum 75mm thick insullation.i have been a sparky for 19 years and only ever seen this done once. all other times, cable is either clipped to the joists and covered by the insullation or thrown over/under insullation, so in contact for more than 300mm
you stated that a shower would almost certainly be on the ring main, when, in most cases of a shower in a house, most are electric and need their own supply.
if my rude comment was 'are you having a laugh', then provide some info that backs up your statement of 'a shower would almost certainly be on the ring main' and if i am wrong i will apologise
electric is more dangerous than a lot of people think, incompetent people just join wires onto something and if it works they think they have done it right. also, you get the word of mouth stuff too, 'my mate used to know a sparky and he said it would be ok'.
i'm not trying to prove anything, just stating facts. if fitting an electric shower rated at 8.5/9.0kw- downstairs wet room or flat = 6mm and 32a MCB (10mm and 40a if 10.5kw), bungalow or house with loft insullation = 10mm and 32a MCB. the only way you can fit 10mm with a 40a MCB in a house is if the cable travels vertical through the loft insullation, clipped onto wooden battens across/around the loft and then vertical through the loft insullation to the pull switch and back up the same and then down to the shower. but, the maximum total for being in contact with insullation is 300mm, so maximum 75mm thick insullation.i have been a sparky for 19 years and only ever seen this done once. all other times, cable is either clipped to the joists and covered by the insullation or thrown over/under insullation, so in contact for more than 300mm
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