Sounds like a poor design boiler. It should be redesigned to provide 1A fused terminals on PCB (like a gas boiler does) for external controls.
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Electric Boiler
- Thread starter sbelec
- Start date
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- boiler electric electrical
What did he do exactly?
S
sbelec
Have seen this before, terminals will take 16mm cable and personally, never happy trying to pin small cables with large cables borne out of seeing the insulation burnt on the smaller cable.
Again many thanks to all, but in my mind the best way is local CU and accept that whilst different local MCB's the supply is common.
D
davesparks
I have probably dealt with roughly the same number of electric boilers and similar but probably 17/18 different makes/models.
Gas and oil systems can be identical apart from the heat being created electrically instead of through combustion. The control system and it's supply can be exactly the same with a completely seperate supply for the heater.
D
davesparks
Can you post a link to the manual for this electric boiler.
Leesparkykent
Nearly Esteemed
what about 45amp switch, load side to a dual connection plate and pattress, one side of connection plate connects to electric boiler, other side of connection plate connects to a FCU.
S
sbelec
Sorry about this power cuts every few minutes! and I have been out to 9 faulty electric boilers in the last 16 weeks plus 2 installs.
The electrician effectively linked the neutral of the control wiring to the neutral of the boiler through the PCB, he did not follow the manual wiring diagram. The pump is external but fed from a dedicated supply from the boiler, on most gas boilers the pump does not need wiring as it is built in.
His diagram or experience said the pump was fed from control wiring so he linked boiler pump neutral to control neutral. When the main isolator neutral came loose (not tightened) the elements had a 1.5mm neutral through the pump PCB outlet in reverse. And it melted along with the neutral wiring in the control box.
But who wires up a boiler nowadays, my 10 year old combi has a plug on it and 2 terminals for the mechanical thermostat as installed by BG. My mate the gas fitter rarely ever gets me involved and then it's normally a new FCU for him to wire into.
The boiler which had the problem of incorrect wiring is a Trianco Aztec, lovely piece of kit and extremely reliable. I replace PCB's on 10 year old pls machines but rarely anything else, the rest of the kit always tests out perfectly. The issue is more prevalent on fitting new PCB's into old units where the RCD issue comes to light due to the mods on pump over run. Especially where an RCD board has been fitted after the original unit installed.
The boiler that I am to fit is client supply and haven't seen it, I am being naughty and asking for general opinions on the main switch / controls supply just in case. But I will plan for my standard install which has been accepted as appropriate by both manufacturers.
As a very last comment I went out last year after a main fuse went, the electician installed a 9kW or 40amp unit in a property and new tenants moved in and blew the fuse. Ran a few tests whilst waiting for ENW and found the main fuse was 60 amps. Before anyone starts going on about 60 amps not being common thats all I have and I live in house built in 1968. They are not uncommon in the north west.
Do not propose electric heating without checking and not assuming, 9kW is 40 amps for about 60 minutes to heat up a small system and a further 30 minutes or so to heat a small tanks. There is no discrimination so boiler, shower and a couple of appliances and you are above the 100 amp rating of the main switch and I have one in front of me which has melted.
And PS regardless what you read you cannot have a direct water heating supply off these boilers you have to have a hot water tank.
Sorry if this is preaching but look at some of the posts on this website, makes me cringe.
The electrician effectively linked the neutral of the control wiring to the neutral of the boiler through the PCB, he did not follow the manual wiring diagram. The pump is external but fed from a dedicated supply from the boiler, on most gas boilers the pump does not need wiring as it is built in.
His diagram or experience said the pump was fed from control wiring so he linked boiler pump neutral to control neutral. When the main isolator neutral came loose (not tightened) the elements had a 1.5mm neutral through the pump PCB outlet in reverse. And it melted along with the neutral wiring in the control box.
But who wires up a boiler nowadays, my 10 year old combi has a plug on it and 2 terminals for the mechanical thermostat as installed by BG. My mate the gas fitter rarely ever gets me involved and then it's normally a new FCU for him to wire into.
The boiler which had the problem of incorrect wiring is a Trianco Aztec, lovely piece of kit and extremely reliable. I replace PCB's on 10 year old pls machines but rarely anything else, the rest of the kit always tests out perfectly. The issue is more prevalent on fitting new PCB's into old units where the RCD issue comes to light due to the mods on pump over run. Especially where an RCD board has been fitted after the original unit installed.
The boiler that I am to fit is client supply and haven't seen it, I am being naughty and asking for general opinions on the main switch / controls supply just in case. But I will plan for my standard install which has been accepted as appropriate by both manufacturers.
As a very last comment I went out last year after a main fuse went, the electician installed a 9kW or 40amp unit in a property and new tenants moved in and blew the fuse. Ran a few tests whilst waiting for ENW and found the main fuse was 60 amps. Before anyone starts going on about 60 amps not being common thats all I have and I live in house built in 1968. They are not uncommon in the north west.
Do not propose electric heating without checking and not assuming, 9kW is 40 amps for about 60 minutes to heat up a small system and a further 30 minutes or so to heat a small tanks. There is no discrimination so boiler, shower and a couple of appliances and you are above the 100 amp rating of the main switch and I have one in front of me which has melted.
And PS regardless what you read you cannot have a direct water heating supply off these boilers you have to have a hot water tank.
Sorry if this is preaching but look at some of the posts on this website, makes me cringe.
S
sbelec
I am a spark but from history prefer control system design, installation and commissioning from industrial control systems hence boilers. Am getting too old for rewires, roof and under floors!
I do. Loads of them for the local heating engineers, even combi's often zoned now, S Plans, Y Plans, Thermal Stores etc.
Leesparkykent
Nearly Esteemed
Same over here. What do you think about #21? This achieves what he wants IMO
I love doing the heating controls. Quite interesting with the different configurations, good money (as a lot of sparks not interested) and most of the time the plumbers have taken over the house, loads of the floors up so makes the wiring easy. Love it!! 
Yeah, that would work and the 45A switch would isolate the whole lot. It is either that or the 2 Way DB as he is doing.
Leesparkykent
Nearly Esteemed
I love doing the heating controls. Quite interesting with the different configurations, good money (as a lot of sparks not interested) and most of the time the plumbers have taken over the house, loads of the floors up so makes the wiring easy. Love it!!
A lot of sparks wouldn't know where to start let alone be interested in them lol.
Hi everyone,
If...
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