Cable Calcs

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kiwiNCFC

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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 :)

 
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

 
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!

 
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