W
walsall
Morning all,
I’ve had a ‘discussion’ with my local NIC rep about a particular scenario that I’d like others advice on please.
Property is TNS. There are two boards, one which does the house and a single switch fuse (BS1361) which feeds a 4mm SWA to garage/workshop. There are main protective bonds to the gas & water as expected from the MET. The 4mm terminated in a box with loads of flex out to lighting & power points in the garage (v. bad)
Customer requested that I rewire the garage with something more suitable and safe. I provided a 2way board with RCBO’s so that his lighting didn’t fail while using power tools and used plastic trunking. There is an incoming water pipe (plastic) which feeds the sink in the garage which then turns in to copper. I ran a 4mm G/Y from the board to the pipe (in the plastic trunking) to bond the copper pipe. NIC bloke said that should be 10mm as it’s a main protective bonding conductor. I said that if it was it should be run continuously from MET to that pipe but realistically that’s not really practical. As the pipe is plastic anyway there is no realistic prospect of there being different earth potential either like there could be if the garage water main was lead and the main install PME for instance. I chose 4mm as it matched the size of the line conductors.
Any thoughts on what’s correct?
I’ve had a ‘discussion’ with my local NIC rep about a particular scenario that I’d like others advice on please.
Property is TNS. There are two boards, one which does the house and a single switch fuse (BS1361) which feeds a 4mm SWA to garage/workshop. There are main protective bonds to the gas & water as expected from the MET. The 4mm terminated in a box with loads of flex out to lighting & power points in the garage (v. bad)
Customer requested that I rewire the garage with something more suitable and safe. I provided a 2way board with RCBO’s so that his lighting didn’t fail while using power tools and used plastic trunking. There is an incoming water pipe (plastic) which feeds the sink in the garage which then turns in to copper. I ran a 4mm G/Y from the board to the pipe (in the plastic trunking) to bond the copper pipe. NIC bloke said that should be 10mm as it’s a main protective bonding conductor. I said that if it was it should be run continuously from MET to that pipe but realistically that’s not really practical. As the pipe is plastic anyway there is no realistic prospect of there being different earth potential either like there could be if the garage water main was lead and the main install PME for instance. I chose 4mm as it matched the size of the line conductors.
Any thoughts on what’s correct?
