T
The General
Morning all.
I'm after some suggestions please - I'm at the very early stages of a new build for a customer and just planning ahead for getting cables in the ground before the foundations go down.
There's a new PME supply cut-out which has been brought into a (very small) shed, and the plan is to run a cable underground for about 10 metres across to the C/U in the new house.
I'm thinking that I will put a Type S 100mA RCD in a small (metal) enclosure in the shed, and then run cables buried direct in the ground. Although, if it makes life easier, the client is happy to run a length of soil pipe or something similar to run cables inside.
So,
Do I run a length of SWA 25mm 2-core and also a length of 16mm earth, or is it going to be easier to run some SWA 3-core 25mm?
I'm concerned about working space for terminations inside the small enclosure at the supply end, so I was thinking that using the 2-core would allow me to run the earth straight to the MET rather than attempting to terminate a 25mm earth inside the enclosure which will probably only have 16mm holes in the earth bar.
Or, could I even just run some 25mm tails inside the soil pipe (or does it have to be armoured because it's buried?)
Does that make sense? Have I missed anything obvious? Would I also need to put in a 80A switch fuse at the supply end or am I covered by having the RCD?
If I go with the 2-core and separate earth, is the earth okay direct in the ground or does it need to go inside some conduit?
Sorry, just realised that's quite a few questions, but hopefully that all makes sense!
Thanks for your input and advice.
I'm after some suggestions please - I'm at the very early stages of a new build for a customer and just planning ahead for getting cables in the ground before the foundations go down.
There's a new PME supply cut-out which has been brought into a (very small) shed, and the plan is to run a cable underground for about 10 metres across to the C/U in the new house.
I'm thinking that I will put a Type S 100mA RCD in a small (metal) enclosure in the shed, and then run cables buried direct in the ground. Although, if it makes life easier, the client is happy to run a length of soil pipe or something similar to run cables inside.
So,
Do I run a length of SWA 25mm 2-core and also a length of 16mm earth, or is it going to be easier to run some SWA 3-core 25mm?
I'm concerned about working space for terminations inside the small enclosure at the supply end, so I was thinking that using the 2-core would allow me to run the earth straight to the MET rather than attempting to terminate a 25mm earth inside the enclosure which will probably only have 16mm holes in the earth bar.
Or, could I even just run some 25mm tails inside the soil pipe (or does it have to be armoured because it's buried?)
Does that make sense? Have I missed anything obvious? Would I also need to put in a 80A switch fuse at the supply end or am I covered by having the RCD?
If I go with the 2-core and separate earth, is the earth okay direct in the ground or does it need to go inside some conduit?
Sorry, just realised that's quite a few questions, but hopefully that all makes sense!
Thanks for your input and advice.