Load and heat

[Gordon lees]

Hello. New to this forum stuff so hopefully this makes sense. I've recently installed a 10mm 3core cable (H07FN-R) to power a 12kw electric boiler. On full power the boiler is drawing 46Amps. I'm a bit concerned as the cable is omitting a slight heat when drawing this load, was just wondering if this is normal?

 

[DPG]

It's a considerable load. If no heat was generated then there would be no need to use such a big cable! Daz

 

[telectrix]

the cable will normally get a bit warm. most cable is rated up to 70deg.C. a slight warming is usual, considering the ccc of the cable. problems may arise if cable is covered in insulation. this reduces the ccc by up to 50%.

 

[Pete999]

Hello. New to this forum stuff so hopefully this makes sense. I've recently installed a 10mm 3core cable (H07FN-R) to power a 12kw electric boiler. On full power the boiler is drawing 46Amps. I'm a bit concerned as the cable is omitting a slight heat when drawing this load, was just wondering if this is normal?

Bit more info required:
How is the cable installed
How long is the run
Voltage
type of supply The list goes on

 

[DPG]

A bigger question is how much is 'slight heat'? Daz

 

[telectrix]

slight heat is warm, as opposed to much heat which is hot. not to be confused with the current sun's heat which is bloody cold at present.

 

[Gordon lees]

Bit more info required:
How is the cable installed
How long is the run
Voltage
type of supply The list goes on

The cable is installed in void above a small cupboard space housing the water tank and this new boiler, as well as the electricity meter etc.
Cable run 6m max
230V. Protective device 63A 30mA RCD.

 

[Gordon lees]

slight heat is warm, as opposed to much heat which is hot. not to be confused with the current sun's heat which is bloody cold at present.

I believe the sun is approx 5600 degrees Celsius most days lol

 

[Gordon lees]

Bit more info required:
How is the cable installed
How long is the run
Voltage
type of supply The list goes on

The cable itself has 3 layers of insulation, quite thick as well. Conductors single insulation and two outer layers, obviously to withstand high external temperatures.

 

[LeeH]

Which sparky school did you attend?

 

[Pete999]

The cable itself has 3 layers of insulation, quite thick as well. Conductors single insulation and two outer layers, obviously to withstand high external temperatures.

I googled this cable and max temp is 60deg

 

[Pete999]

Which sparky school did you attend?

The 17th Sparky School

 

[LeeH]

The 17th Sparky School

Sorry Pete, I was baiting you..

 

[Andy78]

I have to ask, does this circuit have any overcurrent protection ?

 

[Pete999]

Sorry Pete, I was baiting you..

Think nothing of it Lee, been baited by loads during my time, see my PM

 

[DPG]

Intrigued to see the answer to Andy's question about over current protection . Daz

 

[LeeH]

It will have, the OP is just a lttle muddled.

 

[Gordon lees]

Intrigued to see the answer to Andy's question about over current protection . Daz

Well it's been a learning curve finding out the RCD isn't offering over current protection. Will need to replace with an RCBO as soon as possible. Can't seem to find one rated at 63A though. Jesus....

 

[Andy78]

Wind up I'm guessing.

 

[LeeH]