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V

vinny electric

is it ok to wire a heating system with .75 flex as it is protected by a three amp fuse all answers welcome
 
i would use 1.5mm, not just for the current capacity, but for the mechanical strength of the cable and getting good terminations in the FCU. even with 1.5mm flex, you have to double it over or ferrule it.
 
I usually use 0.75 flex for all loops from the main wiring centre to the cylinder stat, pump and boiler. All interlinking cables between the wiring centre - FCU, room stat - wiring centre and wiring centre - boiler isolator are done in 1mm T+E or 3 core.
 
I always use 7 core 0.75 from programmer to cylinder cupboard and use double back box with strip-connectors and blank plate,wiring centres are problematic, use a wireless stat (saves on decor damage & time) then 3 core/4core 0.75 flex to the rest of controls.
Don't forget 3pole isolator at the boiler (fan switch is OK), if your programmer is at the side of the boiler, 4core from
programmer ( 7core,core1 live,core2 neutral,core6 in connector switch wire) to isolator/to boiler, then make a brew.
PS.7core=core3 hot water, core4 heating,core5 hot water off,core7 ??????? scratches head?? EUREKA!! IT'S GREEN & YELLOW (must be earth!!!!) Hope this help you all.
 
i always have my wiring center next to the boiler then you can use a feeed to a fused spur this will then isolate the whole installation so that the boiler can be worked of safely ,even if the MV tank stat is in the airing cupboard easy toconnect up then with the use of an adaptable box etc
 
i always have my wiring center next to the boiler then you can use a feeed to a fused spur this will then isolate the whole installation so that the boiler can be worked of safely ,even if the MV tank stat is in the airing cupboard easy toconnect up then with the use of an adaptable box etc

All the boilers i have ever done have mostly been on a FCU which are mainly just single pole switches or the old time fav of plug top. But never have had to fit a 3 pole isolator, which is why I asked if it's now a manufacterers requirement.
 
Well I would say that most are double pole but you can get single pole.

The supply into a boiler is just L N and E isn't it?, isn't the S/L an internal part of the wiring loom, as I said I've not done a domestic heating system for years.

So if you were taking a dedicated supply from the CU to a boiler FCU you need a LINE S/LINE NEUTRAL and CPC
 

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