Trunking cable capacity

[Ducksy]

Agreed mate, I'm totally bewildered by this thread! How long is the bloody run to need a 4mm CPC?!

How does running in conduit change CPC size anyway?

Sorry DN21 i worked the adiabatic out like this

I²=1400²

t = 0.01

k= 115.....so

S= √(1400²×0.1)/115=3.8mm²

i think you read it wrong no one said running in conduit would change CPC's CSA

 

[D Skelton]

Sorry DN21 i worked the adiabatic out like this

I²=1400²

t = 0.01

k= 115.....so

S= √(1400²×0.1)/115=3.8mm²

i think you read it wrong no one said running in conduit would change CPC's CSA

S= √(1400²×0.01)/115=1.22mm²

Double check the 0.01 value with the manufacturer but I'm 99.99% sure you'd be fine with a 1.5mm CPC

 

[Guest55]

If it was singles I would run a 6mm2 haha, I would like to run a 10mm2, but it would be a complete nightmare to connect into the pull cord switch, so 6mm2 would just have to do, but everyone to their own, in a T&E I am aware it is only 4mm2, another silly decision by the cable manufacturers.

Wtf is this lol??
so you'd like to use a 10mm cpc for a 10mm shower circuit given the choice ? why ?
a silly decision by the cable makers to use 4mm ?? how ?

theres a whole heap of wrong in that post.
;-)

 

[MDJ]

If running singles in a non metal cable containment system Biff we industrial sparks tend to use the same sized CPCs as phase conductors, 2.5 phase with 2.5 cpc, 6mm2 phase with 6mms cpc etc, hence my comment about a 10mm2 which did have a bit of jest in the post, as for the 4mm2 in a 10mm2 Twin and Cpc, I have always concidered a 4mm2 small in comparison, I would much prefer a 6mm2 cable, I don't like the CPC less than half the size of the phase conductors, unless metal containment is used, it's all wrong IMO, and to add to it, I would like to see the CPC actually sleaved in twin and CPC cables too, it is just lazy and money pinching to have the CPC bare, Now be a good boy and pick the daylights out of that comment

 

[Ducksy]

(null)

Thanks D I missed a 0 was rushing and tired........well that's my excuse

 

[D Skelton]

If running singles in a non metal cable containment system Biff we industrial sparks tend to use the same sized CPCs as phase conductors

By 'We' you are including myself in this category and I don't and never will unless calculation warrants a CPC the same size or larger than the live conductors. If I caught any of my lads running a 10mm CPC with 10mm live conductors I would be asking questions! When designing we only use cable that is neccessary, every ounce of wasted and unneccessary copper is paid for out of my pocket at the end of the day!

 

[MDJ]

I wouldn't run one for a shower fella, I was actually jesting about that.

 

[D Skelton]

I wouldn't run one for a shower fella, I was actually jesting about that.

I guessed that, although I still detected a worrying sincerety about your post lol

 

[MDJ]

Just trying to get Biff to bite, you have probably ruined it now, and I thought we were in for a Friday night boxing match, ah well were done now, I give in he was right, I will have to start something else going now.

 

[Jay Sparks]

Just trying to get Biff to bite, you have probably ruined it now, and I thought we were in for a Friday night boxing match, ah well were done now, I give in he was right, I will have to start something else going now.

I like a good fight me.....lol

 

[Guest55]

If running singles in a non metal cable containment system Biff we industrial sparks tend to use the same sized CPCs as phase conductors, 2.5 phase with 2.5 cpc, 6mm2 phase with 6mms cpc etc, hence my comment about a 10mm2 which did have a bit of jest in the post, as for the 4mm2 in a 10mm2 Twin and Cpc, I have always concidered a 4mm2 small in comparison, I would much prefer a 6mm2 cable, I don't like the CPC less than half the size of the phase conductors, unless metal containment is used, it's all wrong IMO, and to add to it, I would like to see the CPC actually sleaved in twin and CPC cables too, it is just lazy and money pinching to have the CPC bare, Now be a good boy and pick the daylights out of that comment

not much of a challenge old bean , as everthing you just said is at complete odds with using the adiabatic to properly size a cpc with regards to evaluating thermal constraints.
and whats with all this "we industrial sparks" bullcrap ? you must think you're the only non domestic spark or something else grand and deluded.

 

[Guest55]

Just trying to get Biff to bite, you have probably ruined it now, and I thought we were in for a Friday night boxing match, ah well were done now, I give in he was right, I will have to start something else going now.

beer + popcorn ready
ding ding round 1.

 

[MDJ]

to add to my first post though, although I was Jesting about the 10mm2, I was serious about the 6mm2, I really don't like CPCs less than half the size of the phase conductors, and do believe Twin and Earth cables should have the earths sleaved not bare, okay lets go round one, put them up :dita:

 

[D Skelton]

Nah, you need to be more subtle if you want ol' biffidus to bite

 

[MDJ]

and whats with all this "we industrial sparks" bullcrap ? you must think you're the only non domestic spark or something else grand and deluded.

Right outside the roxy nightclub at midnight, gloves on

 

[Guest55]

it looks like MDJ's corner have thrown the towel in already.
;-)

 

[MDJ]

I'm still trying to get up off the chair in the corner at the moment, the gloves are so heavy I can't stand up