M
Michael Bloomfield
Hi
Most gas systems are 3 amp , but where i live the boilers are run on oil as there is no gas and they usually require a 5 amp fuse in the switched fuse connection unit(fused spur) hope this helps.
The supply cable may be protected by a 16amp mcb, as its a radial 2.5/1.5mm normally if its a boiler which is being wired on a s plan system or y plan system the boiler manufacturer will specify the correct fuse size to use.You would think so, wouldn't you?
Most gas systems are 3 amp , but where i live the boilers are run on oil as there is no gas and they usually require a 5 amp fuse in the switched fuse connection unit(fused spur) hope this helps.