1mm or 1.5mm T&E for standard lighting circuit in your average house.

[johnduffell]

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.

 

[Midwest]

Maureen, I need a hand down here....pint or a half

 

[Midwest]

We are talking about an average house.

 

[Andy78]

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 don't think anyone is assuming that.

 

[johnduffell]

We are talking about an average house.

Agree hence the caveat about"circumstances you could invent" as it's not realistic to encounter that!

 

[snowhead]

Maureen, I need a hand down here....pint or a half

Margaret, Margaret, there's a fool down here calling you Maureen.

 

[Octopus]

No but go on......

ignore me .............

 

[johnduffell]

I 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

 

[Andy78]

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

 

[Midwest]

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.

 

[Midwest]

Perhaps John is older than me (but younger than Tel), when we did just that, plugging the iron into the lighting point.

Well me Mum did, did the ironing!

 

[Deleted account]

I used to mainly use 1.5mm, but due to LED lighting now mainly use 1mm

 

[davesparks]

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.

If you’ve got an ambient temperature of 50C then it’s clearly not the UK.

 

[davesparks]

I used to mainly use 1.5mm, but due to LED lighting now mainly use 1mm

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.

 

[Deleted account]

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.

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.