Quick question

[BlueIce]

What would be the maximum safe load for a single 5 Meter run of 2.5mm2 T&E PVC cable clipped direct to an internal brick wall?

 

[andy]

What would be the maximum safe load for a single 5 Meter run of 2.5mm2 T&E PVC cable clipped direct to an internal brick wall?

2.5MM has a max capacity of 27A. altho it would have to be on a 20A MCB

 

[Lectrician]

Although some manufacturers do produce 25amp MCB's. These could be used for a fixed appliance.

What are you trying to achieve??

 

[BlueIce]

Thanks to you both for the information!

2.5MM has a max capacity of 27A. altho it would have to be on a 20A MCB

Would that be 27A CONTINUOUS max load at 240V?

 

[andy]

Thanks to you both for the information!

2.5MM has a max capacity of 27A. altho it would have to be on a 20A MCB

Would that be 27A CONTINUOUS max load at 240V?

yes, and technically, its 230V. and running at 27A, it will be hot and possibly as high as 70 deg C

 

[Spark123]

Thanks to you both for the information!

2.5MM has a max capacity of 27A. altho it would have to be on a 20A MCB

Would that be 27A CONTINUOUS max load at 240V?

27A continuous clipped direct to a non metalic surface (or embedded in building material in line with method 1) with a 30 deg centigrade ambient temperature, not grouped with other cables and not run through thermal insulation. 240v does not have a bearing on the current carrying capacity of a cable, it is 27A wether it is 240v, 110v or 12v.

 

[Adam_151]

Thanks to you both for the information!
Would that be 27A CONTINUOUS max load at 240V?

Yes, but thats clipped direct rating without any correction factors applied, unlikely to occur in a house, best to assume 20A as a rough guide*in the average way its installed in a house, any more than this I'd use 4mm²

*Rough guide only, exact installtion method, derating factors, volt drop, disconnect time, etc need to be all calculated and taken into account when selecting a cable

Useul table here: http://www.tlc-direct.co.uk/Figures/Tab4.7.htm

 

[Nijinski001]

Adam
Could you explain the calculation for voltage drop on the table please.
e.g. 2 core 1.0mm cable voltage drop 44.0 amps/metre?

 

[ban-all-sheds]

It's 44mV per amp per metre.

This explains it fully.