I had the house rewired about 18 years ago the electrician used 1 mm twin and earth from a 6 amp breaker in the consumer unit to a fused spur with 3 amp fuse for the combi boiler, I am about to have a new boiler installed and want to know if this cable is actually the correct size it has caused no problem but I would have thought 1.5 was more suitable.
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Are you replacing a boiler or installing a large kettle? 1.0mm is more than sufficient to supply the new boiler!
Where is this mentioned please ?
Discuss Size or Cable for Combi Boiler in the UK Electrical Forum area at ElectriciansForums.net
S
Sparkii
Why 1.5?
D
Deleted member 26818
The current Regulations now prohibit the use of 1mm² cables for power.
The minimum CSA is now 1.5mm².
However that not withstanding, 1mm² should be more than adequate for your combi boiler, especially if the rating of the fuse is still at 3A.
The minimum CSA is now 1.5mm².
However that not withstanding, 1mm² should be more than adequate for your combi boiler, especially if the rating of the fuse is still at 3A.
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not what i would have done but 1mm can take 16a and its fused down anyway to 3a relax its ok
O
Octopus
Are you replacing a boiler or installing a large kettle? 1.0mm is more than sufficient to supply the new boiler!
Where is this mentioned please ?
D
Deleted member 26818
BS7671 Regulation 524.1, Table 52.3, pages 129 and 130.
S
Silly Sausage
re 524.1...
Depends on how you interpret that reg (a bit like any other!).
A spur to a combi is hardly a power circuit.
Serious anorak time, this discussion!
Depends on how you interpret that reg (a bit like any other!).
A spur to a combi is hardly a power circuit.
Serious anorak time, this discussion!
D
Deleted member 26818
I suppose you can interpret the Reg. however you wish.
How do you interpret the table to mean anything other than what it states?
Lighting 1mm².
Power1.5mm².
Is a combi, some new form of lighting, should I re-lable all the CUs from boiler to lighting?
How do you interpret the table to mean anything other than what it states?
Lighting 1mm².
Power1.5mm².
Is a combi, some new form of lighting, should I re-lable all the CUs from boiler to lighting?
B
Badged01
Have to agree, that would be my interpretation. Min of 1.5mm for basically any circuit other than lighting (or control!)
Reply to Size or Cable for Combi Boiler in the UK Electrical Forum area at ElectriciansForums.net
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