voltage drop

[macloon]

I am about to instal a new lighting circuit in an extension with vaulted ceilings. I have calculated the length to be about 100m, and have worked the voltage drop with 1.5mm cable to be 12.18 using the calculation of: 29(from table 6e2) x 4.2(design current) x 100(length) all divided by 1000. Is this acceptable if not has anyone got any suggestions on what to do? thanks.

 

[i=p/u]

nice one..

 

[vaughant]

i did what Tony said on my kitchen lights and 2.5mm'd it due to me putting 20 x 50watt gu10's in it,I felt the load would be a bit heavy @ 1000watts,I'm afraid more rule of thumb than checking my regs.

I've never had any issues with tripping out or bulbs blowing,I'd say I'm still on 18 of the original 20 b&q specials,not bad!!!!