On 10 Mar 2006 08:47:24 -0800, eto wrote:

1) should I go to 10mm cable ?

No, 6mm is fine if it's in air, see:

http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

2) I have purchased a 30mA RCD - but after reading about 'nuisance
trips' etc should I go for bigger ?

No, 30mA is right for power. You can split your consumer unit and put
100mA on the lights, but I think nuisance tripping is only a problem
if you could fall down the stairs. Much better to put an emergency
light in the hall, a rechargeable fluorescent is fine.

3) bathroom bonding is all ok, but one article recommends 'thickish'
cable for the secondary bonding line back to the board. Do I then
assume that the cable built-in earth wire ain't enough ?

IMO, bonding is a load of ******** if you have an RCD. Someone else
will come along and disagree with me in a moment.

--
Nigel M