2 supplys to one radial

[25067315]

HI

I am having a new kitchen installed and they have put all the lights (Ceiling, Plinths and pelmets) in the kitchen and utility room on to one radial. When I turn on them all on at once the trip go ( 6amp breaker ). They have said they will run a second Live to the radial on a separate 6 amp breaker. Is this allowed? When I had trouble with this happening in my work shop the sparks put in a type c breaker I think which sorted the problem should they not just do that? Is he trying it on for more money?

Thanks for your help People

Simon

 

[Spark123]

No, they must not connect two breakers to the same circuit. They may split the circuit into two and run a new feed in to supply the new reduced circuit. They can fit type C breakers although type C refers to the magnetic setting which overcomes surges i.e. starting currents, lamps failing etc. They have the same thermal setting as a type B. The other option which may be available is to fit a 10A breaker, which will depend on cable size, run, volt drop, efli, lamp holders etc.

 

[25067315]

Thanks Sparks123

Cable Size = looks to be 1mm
Cable Run = max 10 meters
Volt Drop and efli = I dont know what these are or mean
Lamp = I think he said selv or somthing to that effect there are about 10 65w transformers and then the lamps come off them.

Change to a 10amp

 

[Spark123]

1mm² flat twin and earth has a maximum clipped direct current rating of 16A. This rating is dependant on the ambient temperature, if it is grouped with other cables and wether it is run through/on thermal insulation.
1mm² has a volt drop of 44mV/A/m, so (44mVx10Ax10m)/1000=4.4v which is acceptable. The earth fault loop impedance will need to be low enough to operate the circuit breaker quickly enough in the event of a fault. As this work is notifiable under part p of the building regs (England/Wales) is the installer is a member of a competent person scheme? If so they will have the an earth fault loop impedance tester as part of their test kit.

 

[Adam_151]

If so they will have the an earth fault loop impedance tester as part of their test kit.

Or their qualified superviser back at the office will, which the tester very rarely leaves....

(if you don't see a tester come out, report them to their registration organisation)