Power to outbuilding- Consequences of extraneous-conductive-parts on choice of SWA size

[PEG]

If it is urgent,and you have not involved anyone who could specify a suitable cable on site,i would put a duct in. It will be considerably cheaper than the wrong choice of cable.

Your installation needs assessing properly,as the description has two different earthling arrangements,in one paragraph.

 

[Sparkingmad]

I would definitely seek expert advice from an electrician. You want to run swa 25mtrs in the garden how far is the mains from point of termination of swa? I would run a 50mm duct and make sure it’s smooth bore inside with a nylon drawstring. Then I would attach a draw rope and pull that through so you can pull what ever cable your sparks calculates and designs. Also consider if you need phone, internet, cctv or alarm cables taken up to the workshop? If you do it might be wise to lay a separate smaller duct in at the same time.

 

[Daniel Pooley]

Hello everyone, thank you for all the replies. I am running a duct in anyway as (like you guys) I think it a good idea for the future. Annoyingly this duct will have several tight bends in it so I really want to get the SWA in. This is due to the nature of my property, which is terraced into a hill.

@spinlondon - price aside, I want to conform to regs, and I guess another ~40quid to go from 6mm to 10mm is okay.


Thank you everyone for the advice. I wish someone had of adressed the questions but okay, you have my safety at heat.

I am going to push ahead and put in 10mm, 3-core, SWA from the house CU to the workshop. I *think* this way I coverall bases as a future sparky could:

1. Bond all extraneous-conductive-part
2. Make a TT system with earth rod
3. Or, if the metallic items are not considered extraneous-conductive-part, just have a very nice fat earth from the house CU.

Advice (constructive if possible) still appreciated

dan

 

[Octopus]

Apart from the fact you should get a spark involved, I would say the bigger cable 3 core then you have flexibility.

And sea can't go round tight corners so you may need to reconsider your route

 

[Daniel Pooley]

@Murdoch - thank you for the advice. I think my cable route is okay, laying it in the trench, I just wouldn't fancy pulling it through a duct.

Where I go into the building I need a junction box anyway.

 

[aesmith]

Advice (constructive if possible) still appreciated

Make sure you leave enough cable sticking out at both ends, particularly if you don't know the exact route the electrician will take at the house end.

 

[Octopus]

Where I go into the building [B]I need a junction box [/B]anyway.

Err no

Disagree 100%

 

[Daniel Pooley]

@Murdoch is there any way you can advise me. I understand talking to someone like me is frustrating so at the same time, please do not feel obliged.

best

dan

 

[Octopus]

Err no

Disagree 100%

@Murdoch is there any way you can advise me. I understand talking to someone like me is frustrating so at the same time, please do not feel obliged.

best

dan

Consult a local spark is my advice ........................

 

[Amp David]

spark?

No way, just an earthling