Swa size

[gazdkw82]

Friend of mine is having a feed to his shed.

Wants 5 sockets and some basic lighting. I think 40A would be sufficient.

its 20ft away max.

what size swa would you recommend?

Would 16mm be ok?

 

[Simonslimline]

What do your calculations say?

Based on actual Ib and not In.

 

[micknew]

35mm 4c core to be on the safe side.

 

[Dan the spark]

Have you checked the regs to see what the maximum current carrying capacity of 16mm SWA is?

 

[Wonderwall]

35mm 4c core to be on the safe side.

At the very least.
plus a separate 25 mm Earth wire just to be on the safe side.

 

[Dave OCD]

Come on the OP is a trainee, the posts above are hardly productive ?

 

[Deleted member 72666]

It's not a job you should be considering.

 

[Dan the spark]

The regs are there to help you out in this situation. Have a look at the current carrying capacities of SWA, installation method comes into play and also volt drop. I'd say that if its 20feet max then your not going to notice much volt drop but just to 'cross the Ts and dot the i's'.

 

[micknew]

Come on the OP is a trainee, the posts above are hardly productive ?

Perhaps it should be in the trainee or DIY section?

 

[davesparks]

Friend of mine is having a feed to his shed.

Wants 5 sockets and some basic lighting. I think 40A would be sufficient.

its 20ft away max.

what size swa would you recommend?

Would 16mm be ok?

Could you tell us what calculations you did to get arrive at 40A and 16mm, then we will be able to help you understand where your calculations may be going a bit wonky.

If you are a trainee as mentioned above then it would be best to ask your questions in the trainee section where you won't get any of the **** taking which has occurred in this thread.

To be honest you would be better off ask the electrician Ho is mentoring you through your apprenticeship for help, and also to advise you on when you are ready to start doing little jobs like this on your own.

 

[davesparks]

Is their not a forum trainee or DIY section?

There is, and hopefully the OP will now post there in the future

 

[davesparks]

The regs are there to help you out in this situation. Have a look at the current carrying capacities of SWA, installation method comes into play and also volt drop. I'd say that if its 20feet max then your not going to notice much volt drop but just to 'cross the Ts and dot the i's'.

The current carrying capacity tables are no use until a figure of In which has been adjusted according to correction factors has Ben established

 

[Dan the spark]

The current carrying capacity tables are no use until a figure of In which has been adjusted according to correction factors has Ben established

I thought op had already worked out In as they stated the value of 40amps

 

[gazdkw82]

Sorry for late reply. Battery died

I should have explained. i was given this information from a friend of mine who is doing the job, I'm just helping and watching really. I was just thinking out loud and wanted to know what size swa would be needed. He probably knows already but I wanted to see if I could figure it out myself.

i guess I would need more information to really work it out

 

[micknew]

Sorry for late reply. Battery died

I should have explained. i was given this information from a friend of mine who is doing the job, I'm just helping and watching really. I was just thinking out loud and wanted to know what size swa would be needed. He probably knows already but I wanted to see if I could figure it out myself.

i guess I would need more information to really work it out

If he only 'probably knows' he shouldn't be doing the job.