OSG = On Site Guide
house rewire
- Thread starter davedasave
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cheers mate
am i also right in thinking that i will have to run a seperate earth to the shower and cooker?
am i also right in thinking that i will have to run a seperate earth to the shower and cooker?
The initial surge from halogen lamps is a lot higher than normal ones, which is why dimmers need de-rating if they have not been designed with halogens in mind, but it's of such short duration that it won't trouble the cable. 1.5mm² is good for 14-20A, and lighting circuits are usually on 6A breakers.davedasave said:
If you are planning to use ELV lighting then you do have to watch out for the cable sizes you use on the 12V side, particularly if runs are long, as volt-drop can catch you unawares long before you get to the cable capacity limit - for example 100W of 12V lighting only needs 1mm² cable to carry the load, but once you get much beyond 3m you need 4mm² cable to avoid excessive volt drop.
There's a handy calculator here: http://www.tlc-direct.co.uk/Technical/Lighting/VoltageDrop.html
How do you mean 'separate'
The cpc in the supply cable should be adequate.
You should have bonding to water/gas/oil pipes, size depends upon type of supply.
Shower cpc should be bonded to lighting in the vicinity of the bath/shower room. The reason for this is that although they are both connected to the Main Earthing Terminal, the resistance of the 1mm cpc will allow exposed conductive parts on the lighting circuit to be at >50v momentarily under fault conditions.
(I anticipate an augument from some sparkies over my last comment)
The cpc in the supply cable should be adequate.
You should have bonding to water/gas/oil pipes, size depends upon type of supply.
Shower cpc should be bonded to lighting in the vicinity of the bath/shower room. The reason for this is that although they are both connected to the Main Earthing Terminal, the resistance of the 1mm cpc will allow exposed conductive parts on the lighting circuit to be at >50v momentarily under fault conditions.
(I anticipate an augument from some sparkies over my last comment)
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No, but you will need supplementary equipotential bonding in the bathroom.davedasave said:
Info is in, you've guessed it, the OSG. And Whitfield's Electrician's Guide.
If you have plastic pipes supplying your bathroom you should read this:
http://www.iee.org/Publish/WireRegs...tumn_plastic_pipes_to_bond_or_not_to_bond.pdf
These also have useful info regarding bathrooms:
http://www.niceic.org.uk/downloads/NL139supp.pdf
http://www.niceic.org.uk/downloads/E169-9.pdf
and whilst you're on their site you might as well get these:
http://www.niceic.org.uk/downloads/C5-43.pdf
http://www.niceic.org.uk/downloads/concealedcables.pdf
which explain the rules for concealing cables in walls.
that is a handy little tool!! cheers mate
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And I just came across this post. I am wondering:
a) If the original poster finally called in a contractor or was successful in his ambition?
b) If the property is still standing, or has burned to the ground?
c) If the original poster would call in a contractor if he had the decision to make again?
d) If any of the circuits have tripped in the last two years?
e) If he got any or all of those books from Amazon?
Peace,
Jeff
a) If the original poster finally called in a contractor or was successful in his ambition?
b) If the property is still standing, or has burned to the ground?
c) If the original poster would call in a contractor if he had the decision to make again?
d) If any of the circuits have tripped in the last two years?
e) If he got any or all of those books from Amazon?
Peace,
Jeff
Hi moderatorperson. Just a thought, there's been quite a few resurrected old posts recently.
I wonder if there's a way that you guys can lock a thread once the last post is more than, say, 6 months. that way it can be searched an viewed as reference but not continued.??
I wonder if there's a way that you guys can lock a thread once the last post is more than, say, 6 months. that way it can be searched an viewed as reference but not continued.??
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You don't live here anymore!
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