Trunking & Conduit capacities

[hoppy]

Hi, can some one help please.

When calculating conduit and trunking capacities using the amicuss table and the multiplying factors for cables, do you only multiply by the number of live conductors (i.e all the live and neutrals for every circuit), or do you also include the cpc for every circuit in the calculation.

Hope this makes sense.

Craig

 

[Evans Electric]

Yes , as far as I know, its about physical space . Leave 40% space so the next sparks can turn up and fill it up.

 

[matt.leung]

include the cpc in the calculation ...

 

[hoppy]

Cheers guys, thanks for the advice.

Craig

 

[green-hornet]

Cal;culations are always on the number of live cables, that includes nuetrals.

 

[Apache]

Cal;culations are always on the number of live cables, that includes nuetrals.

so exclude the cpc!

 

[green-hornet]

Yes

 

[ianmacd]

Leave 40% space so the next sparks can turn up and fill it up.

Or the plumber to put a few heating pipes in there.

 

[green-hornet]

Or the plumber to put a few heating pipes in there.

I did a pir on a school where the plumber had run a 15mm pipe in the 50mm trunking!

I had a right job explaining why I failed there electrical installation because of a plumberROTFWL

 

[hoppy]

So i only count the line and neutral conductors for each circuit and ignore all cpc's.

Is this correct?

 

[Andy™]

im sure you add all conductors. inc CPC's. after all, they do take up space!

 

[hoppy]

I'm confused, i thought you would add all, but then in a level 2 text book it says just use line and neutral. Had a quick look in the on-site guide and it doesn't mention what conductors to use!

I appreciate everyones reply's but does anyone know the deffinet answer as I have an exam coming up?

Thanks Guys!

 

[Andy™]

dont have regs/osg here to check, but can see why you would leave the earth out of spacing calcs

 

[Zeespark]

Count all 3, even if Neutral & CPC are smaller.

AndyGuiness Drink

 

[green-hornet]

dont have regs/osg here to check, but can see why you would leave the earth out of spacing calcs

You include all for spacing and can use rule of thumb, for carring capacity you only count the live cables. Neutral would be classed as a live.

 

[a1]

or the plumber to put a few heating pipes in there.

ROTFWL

 

[Andy™]

You include all for spacing and can use rule of thumb, for carring capacity you only count the live cables. Neutral would be classed as a live.

yes, but the question said trunking capacities... nothing about current capacity

 

[hoppy]

Sorry guys, my fault, i was asking with regard to spacing capacity!

 

[green-hornet]

Sorry guys, my fault, i was asking with regard to spacing capacity!

No problem you now have the answers to eitherROTFWL

 

[hoppy]

I know I learned more than i thought.

Thanks green-hornet.