Cross sectional area current capacity

[Gardner]

How would you go about figuring the current carry capacity of 2.08mm2 copper conductor? In so far no reg tables have none standard size.

 

[Gardner]

Also to note here is that the cables may be required a derating factor if connected to equipment rated at 70c, through experience that is most switchgear etc out there.

Would de-rating cable for equipment allow for higher current? Ie the cable temperature is lower at the equipment as apposed to in contact with thermal insulation?

It seems those CCC tables by the cable maker take into account all installation methods.

 

[Darkwood]

Would de-rating cable for equipment allow for higher current? Ie the cable temperature is lower at the equipment as apposed to in contact with thermal insulation?

It seems those CCC tables by the cable maker take into account all installation methods.

When you have a 90c cable it has a higher current rating but if it connects to standard 70c rated equipment then you need to apply a derating factor to the cables CCC which will reduce the load it can handle. This is a point often overlooked.

 

[Gardner]

When you have a 90c cable it has a higher current rating but if it connects to standard 70c rated equipment then you need to apply a derating factor to the cables CCC which will reduce the load it can handle. This is a point often overlooked.

Good point. That is something overlooked.

 

[GB.Kayak]

Or you could just just my super scientific graph (please dont!)

View attachment 29361

... hhd; is that really 'your' graph ... ? I seem to remember that it was posted in response to a thread that you started; possibly by a 'dearly beloved' and 'departed' friend! You may correct me if I am wrong. Funnily enough, if the conditions of installation and design of the cable were sufficiently 'similar' to a particular 'case' recorded in a table in BS 7671 then that is the approach that I would take ... so long as the organisation that you work for has plenty of professional indemnity insurance and you or your boss has a big pair of 'cahunas' then I imagine that there shouldn't be too much of a problem. Unless the proverbial hits the fan and someone from that infamously litigious society across 'the pond' takes you to court!

 

[HappyHippyDad]

... hhd; is that really 'your' graph ... ? I seem to remember that it was posted in response to a thread that you started; possibly by a 'dearly beloved' and 'departed' friend! You may correct me if I am wrong. Funnily enough, if the conditions of installation and design of the cable were sufficiently 'similar' to a particular 'case' recorded in a table in BS 7671 then that is the approach that I would take ... so long as the organisation that you work for has plenty of professional indemnity insurance and you or your boss has a big pair of 'cahunas' then I imagine that there shouldn't be too much of a problem. Unless the proverbial hits the fan and someone from that infamously litigious society across 'the pond' takes you to court!

In that case GB consider yourself corrected :smile5:

http://www.electriciansforums.co.uk...lations/101420-lollipop-circuit-40a-rcbo.html see post 19.

 

[GB.Kayak]

In that case GB consider yourself corrected :smile5:

http://www.electriciansforums.co.uk...lations/101420-lollipop-circuit-40a-rcbo.html see post 19.

... it's not my fault ... its what's left of my little grey cells ... ;-P. Pass the D hat; I'll assume 'the position' facing the corner with my nose touching the wall! I am sorry hhd ;-(.