new light circuit garage

georges · May 25, 2012

looked at ajob to fit 2 new flouresents on a new circuit in a garage db has 3036 fuses fitted and already has sockets in garage. the feed is from a 17th edition twin rcd board on a 40a mcb on tt earthing at the house end only. main earth bonding to water is 6mm. was going to fit new circuit with 6a 3036 fuse in garage and upgrade main bonding in house to 10mm any thoughts

telectrix · May 25, 2012

no need to upgrade bonding on a TT if it's 6mm. a 2nd rod at the garage end would help to bring the Ze down . are there extraneous conductive parts in garage ( water etc.) ?

Octopus · May 25, 2012

Can't see how fitting lights in a seperate garage would need any change to the house.

Tin hat on.

georges · May 25, 2012

thanks for kwik reply theres is not any extaneous conductive parts ze on house is 110 ohms

telectrix · May 25, 2012

so , with a Ze of 110 ohms, your pefc is just over 2A. i'm sure the earthing and bonding in the house can take that! bang a decent ( 2 screwed together, 5/8") rod in near the garage. combine with existing TT, then see how low you can go with your Ze.