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G

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?
 
It's a considerable load. If no heat was generated then there would be no need to use such a big cable! Daz
 
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%.
 
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
 
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. :eek:
 
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.
 
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.
 
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
 
Intrigued to see the answer to Andy's question about over current protection . Daz
 
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....
 

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