Tri-Rated Cable de-rating factors.

[disinfo]

Hello,

Tri-Rated cable has a derating factor of 0.80 for two cores.

Does anyone know if this refers to two cores of different circuits or two cores of the same circuit?

Basically, I am wanting to run 10mm tri-rated (in conduit) for my new shower installation and am trying to de-rate it accordingly.

Many thanks

 

[RexT]

Hi disinfo,

I know one of the guys here will be able to help.

Sorry cant think at the moment with an answer, but could ask you whether you could run it in a different method to get the highest allowance re rating purposes?

Hope this helps,

Rex

 

[disinfo]

Hi disinfo,

I know one of the guys here will be able to help.

Sorry cant think at the moment with an answer, but could ask you whether you could run it in a different method to get the highest allowance re rating purposes?

Hope this helps,

Rex

Hi Rex,

Its got to be run in conduit really to give it some mechanical protection.

Also, its quite a difficult path and going to be in a mixture of flexible and rigid PVC conduit.

Cheers

 

[Notsosmart]

It will apply to different circuits, but why are you using tri-rated? Contrary to the Urban myth It doesn't have a higher current rating for the same size T&E and must be harder to install (also you will have to ferrule the terminations)

 

[disinfo]

It will apply to different circuits, but why are you using tri-rated? Contrary to the Urban myth It doesn't have a higher current rating for the same size T&E and must be harder to install (also you will have to ferrule the terminations)

Thanks for that.

I'm using tri-rated because I build Machine control panels for a living. I have a 100m roll of 10mm Tri Rated that I can use for this purpose.

Also, i'm using tri-rated because I already have a conduit run installed behind the plasterboard walls, so it would seem daft to use T&E.

As far as the CCC is concerned in comparison to T&E, i'm not really that bothered for the reasons stated above as long as its >=. What is the CCC of 10mm T&E in free air anyway, the tri-rated is listed as 75A in free air (at 35 ambient temp)

And as far as putting on bootlace ferrules, 12 presses of a ratchet crimper is hardly something to worry about is it?

PS I realise that a conduit installation is not "in free air" but in the absence of derating factors for tri-rated in conduit, i'm just using it for comparison