S
sjwkmje
Hi,
I recently wired a garage that is 4 meters from the house. I split the tailes and fed a seperate CU with a single RCBO (63a). This connects to 6mm twin and earth up and accross the loft and down the side of the house in galv ducting. This then goes to an IP66 diecast box which terminates the SWA at the side of the house. The SWA is 6mm. This runs under ground to the garage and comes up into a crabtree metal clad box.
I want to know if the garage can rely on the eath that is used with the house. When I split the tails I ran 16mm earth to the CU and connected the earth from the twin and earth there. The earth on the twin and earth connects to the earth in the SWA (3 core and earth) and also to the sheeth. The galv ducting as it runs high on the house has a dedicated earth spike with external clamp into the pipe work as a low resistance path if it gets hit by lighhting.
Now at the garage end do I need a earth spike? If I fit one do I connect the earths from the SWA with the one from the earth spike in side the CU on the earth bar. Does the earth spike then come suplementry bonding? Do I need the spike?
Been thinking about this for some time and nothing in the regs seem to help.
I know that the Circuit Earth Loop Impedance value (Zs) must conform to stated values within the Guidance Notes 3 IEE Inspection and Testing of Electrical Installations to ensure safe operation of protective devices within the correct disconnection times.
Adam
I recently wired a garage that is 4 meters from the house. I split the tailes and fed a seperate CU with a single RCBO (63a). This connects to 6mm twin and earth up and accross the loft and down the side of the house in galv ducting. This then goes to an IP66 diecast box which terminates the SWA at the side of the house. The SWA is 6mm. This runs under ground to the garage and comes up into a crabtree metal clad box.
I want to know if the garage can rely on the eath that is used with the house. When I split the tails I ran 16mm earth to the CU and connected the earth from the twin and earth there. The earth on the twin and earth connects to the earth in the SWA (3 core and earth) and also to the sheeth. The galv ducting as it runs high on the house has a dedicated earth spike with external clamp into the pipe work as a low resistance path if it gets hit by lighhting.
Now at the garage end do I need a earth spike? If I fit one do I connect the earths from the SWA with the one from the earth spike in side the CU on the earth bar. Does the earth spike then come suplementry bonding? Do I need the spike?
Been thinking about this for some time and nothing in the regs seem to help.
I know that the Circuit Earth Loop Impedance value (Zs) must conform to stated values within the Guidance Notes 3 IEE Inspection and Testing of Electrical Installations to ensure safe operation of protective devices within the correct disconnection times.
Adam