swa cable workout

[citybluesmith]

please help.i am doing my electrics course and need help on working out cable size for swa cable.for example if i had a shed with a con unit in it with a 32amp mcb and a 6 amp mcb.how would i workout what swa to use ? cheers

 

[Sintra]

1. Find design current (ib)
2.Find protective device rating (in). (in) is equal to or greater than (ib)
3.Apply any relevant correction factors
4.Select cable size from BS 7671 app 4 (iz)
5.Calculate voltage drop.

 

[scotsparky]

scecify a 3 core makes working out the CPC and Zs a lot easier