Hello folks.
Please don't shoot me down if this has been covered before, just point me in the right direction.
We recently ran a power supply from a house with PME supply down a very long garden (200ft), via SWA to a large shed.
The 'run' went as follows;
From CU MCB in T & E to junct box, convert to SWA, burried SWA in garden to JB in shed, back to T & E in shed to sub board.
SWA was 3 core 10mm. Used 2 cores as Phase/Neutral and third core as earth. Metal braiding of SWA connected to earth cable in both JBs.
Got respectable Zs, not much volts drop, everything ticketyboo.
Here's the shocker.........
We (the company) have been told this installation is not complient with regs!
What we should do is SEVER the 3rd core we have used as an earth (10mm)at the sub-board and put in an earth rod in to make it a TT sub-system.
The only way to stop us having to do this is to run a seperate 10mm 'bonding cable' (yellow/green) directly from CU earth bar to sub-board.
My boss phoned NICEIC tech desk and they agreed, the installation we have put in does not comply with regs.
Am I being a spaz here, do we seriously have to get rid of a perfecly good 10mm copper earth conductor and use tera firma as the earth return?
Has anyone else heard of this?
Bigs
Please don't shoot me down if this has been covered before, just point me in the right direction.
We recently ran a power supply from a house with PME supply down a very long garden (200ft), via SWA to a large shed.
The 'run' went as follows;
From CU MCB in T & E to junct box, convert to SWA, burried SWA in garden to JB in shed, back to T & E in shed to sub board.
SWA was 3 core 10mm. Used 2 cores as Phase/Neutral and third core as earth. Metal braiding of SWA connected to earth cable in both JBs.
Got respectable Zs, not much volts drop, everything ticketyboo.
Here's the shocker.........
We (the company) have been told this installation is not complient with regs!
What we should do is SEVER the 3rd core we have used as an earth (10mm)at the sub-board and put in an earth rod in to make it a TT sub-system.
The only way to stop us having to do this is to run a seperate 10mm 'bonding cable' (yellow/green) directly from CU earth bar to sub-board.
My boss phoned NICEIC tech desk and they agreed, the installation we have put in does not comply with regs.
Am I being a spaz here, do we seriously have to get rid of a perfecly good 10mm copper earth conductor and use tera firma as the earth return?
Has anyone else heard of this?
Bigs