Cable Calcs

[kiwiNCFC]

I am practising my cable calculations (In,It,Ib stuff) and just wondered if anyone would be able to give me some examples? i.e. 230v supply, 3.5kw?

If not, dont worry

 

[armbands0]

Hi here are a couple my tutor gave me last year.

A

Installation is a shower rated at 8.5Kw, it is to be installed using 70

 

[kiwiNCFC]

Thanks for that, havent got round to doing it until now so here is my answer! Hope it is right!

Question A

IB = 8500/230 = 36.95A

IN = 45A (BS3036)

IT = Ca = N/A

Cg = 0.75

Cc= 0.725

Ci = N/A

45A / (0.75x0.725) = 82.75A

So far its 16mm @ 85A in table 4 something

Volt Drop = m/v/a x IB x L

1000

2.8 x 36.95 x 50

1000 = 5.17 v Which is within 5% of 230v

Is this right?

Thanks!