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Maureen, I need a hand down here....pint or a half
Margaret, Margaret, there's a fool down here calling you Maureen.
Discuss 1mm or 1.5mm T&E for standard lighting circuit in your average house. in the Lighting Forum area at ElectriciansForums.net
Maureen, I need a hand down here....pint or a half
No but go on......
Agree, sorry wasn't disagreeing with anyone, just trying to add somethingI don't think anyone is assuming that.
Agree, sorry wasn't disagreeing with anyone, just trying to add something
Another point is if you might want to repurpose some of the cables in future as "power" instead of "lighting"you'd be better with 1.5
I've often thought I'd be better off without lights and having sockets on the ceiling instead
Perhaps John is older than me (but younger than Tel), when we did just that, plugging the iron into the lighting point.
You couldn't totally assume 1.0 is ok in all circumstances you could invent. Never mind volt drop for now, but if there are 20 circuits bunched in 50c ambient under insulation you'd have to do a bit of redesign.
I used to mainly use 1.5mm, but due to LED lighting now mainly use 1mm
10-15 years ago everyone suddenly started wanting loads of GU10 down lights in each room. Even though 4 would be ample, customers wanted 6,9,12 down lights in each room. This was when you would use a 50W or 35W GU10. Added to that the wall lights the loading soon added up. As I said in my post when people started using LED the loading dropped dramatically.This kind of statement never makes sense to me, the average domestic lighting circuit is put on a 6A mcb with cable size calculated accordingly.
Lee,Out of interest what's most commonly used?
That def sounds like your average house doesn't it! Sorry I took so long to reply but my computer was in the pool house, 50 meters down the corridorLee,
Surely ... or is that 'Shirley' ... there is no 'standard' house and therefore the BS 7671 design rules need to be applied effectively! I am working in a large (?) Georgian property at the moment and the landing lighting circuit is > 50 m in length. Whilst nominal 230 V LED lamps may be fitted, and who would want to replace 8 lamps in each of 2 chandeliers with 100 W incandescents, it is theoretically possible even if the light fittings are not designed for 0.8 kW for someone to do so!
Lee,That def sounds like your average house doesn't it! Sorry I took so long to reply but my computer was in the pool house, 50 meters down the corridor
So you would walk in to your typical, average 3 bed semi to quote for a rewire....you would then apply the design rules as you put it of BS7671 or you would know without a shadow of doubt that a 1mm lighting circuit will be absolutely more than adequate because you are an experienced electrician without putting pen to paper?Lee,
I didn't for one moment imply that the house that I am working on is 'standard' or 'average' ... merely that effective application of BS 7671 design rules are required in every case!
This thread is about "standard lighting circuits in an average house", not about large Georgian properties. We're not talking 8 lamp chandeliers, more single white plastic pendants in the middle of each room, possibly 2 in the lounge.Lee,
I didn't for one moment imply that the house that I am working on is 'standard' or 'average' ... merely that effective application of BS 7671 design rules are required in every case!
... clearly ... as you put it like that ... 1.0 mm2 every time!So you would walk in to your typical, average 3 bed semi to quote for a rewire....you would then apply the design rules as you put it of BS7671 or you would know without a shadow of doubt that a 1mm lighting circuit will be absolutely more than adequate because you are an experienced electrician without putting pen to paper?
Reply to 1mm or 1.5mm T&E for standard lighting circuit in your average house. in the Lighting Forum area at ElectriciansForums.net
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