Attended a Worcester Ri which has been 'At Risked' by the service contractor due to boiler wiring. Boiler has been in operation for over 5 years.
Cylinder and all controls and fused spur located inside the property, boiler located in garage. The boiler only has SL N E supplying it, installer has connected the SL to the boiler L and bridged to boiler SL meaning the boiler is powered down until a demand is made and when the demand is satisfied comes to a very quick shut off too, no fan over run to clear flue, no pump over run to dissipate heat so will require wiring correctly to get a permanent live and pump live as per manufactures instructions.
There is a double socket available in the garage, the option of running a 5 core from boiler back to control centre is not possible. I'm going to supply the boiler with L N E from the garage double socket, either with a 3A plug or fused spur.
The existing cable feeding the boiler I will keep the SL as SL and use the N for the Pump Live.
So I will now have 2 cables going into the boiler - L N E (from garage) & SL PL (from and to the control centre). I have ordered electrical warning labels to inform service engineers there are 2 separate electric supplies/isolators to the boiler, one in the garage and one from the control centre in the house.
Recommendations Please!!
I would like one isolator at the boiler to cut off both cable feeds, the usual 3 pole fan switches will not work as I need to isolate L N SL PL.
The only isolator I can see that may do the job is the 16A BG 4 Pole Rotary Isolator Screwfix part number 874XF which appears excessive but can't find anything else.
Appropriate warning labels will clearly giving locations of both electrical isolation points will hopefully keep future engineers safe but I feel the service contractor they have here will likely flag up 'no isolation point' directly at the boiler when they return, interestingly they offered no solutions to this issue, just 'at risked' it and left...
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Cylinder and all controls and fused spur located inside the property, boiler located in garage. The boiler only has SL N E supplying it, installer has connected the SL to the boiler L and bridged to boiler SL meaning the boiler is powered down until a demand is made and when the demand is satisfied comes to a very quick shut off too, no fan over run to clear flue, no pump over run to dissipate heat so will require wiring correctly to get a permanent live and pump live as per manufactures instructions.
There is a double socket available in the garage, the option of running a 5 core from boiler back to control centre is not possible. I'm going to supply the boiler with L N E from the garage double socket, either with a 3A plug or fused spur.
The existing cable feeding the boiler I will keep the SL as SL and use the N for the Pump Live.
So I will now have 2 cables going into the boiler - L N E (from garage) & SL PL (from and to the control centre). I have ordered electrical warning labels to inform service engineers there are 2 separate electric supplies/isolators to the boiler, one in the garage and one from the control centre in the house.
Recommendations Please!!
I would like one isolator at the boiler to cut off both cable feeds, the usual 3 pole fan switches will not work as I need to isolate L N SL PL.
The only isolator I can see that may do the job is the 16A BG 4 Pole Rotary Isolator Screwfix part number 874XF which appears excessive but can't find anything else.
Appropriate warning labels will clearly giving locations of both electrical isolation points will hopefully keep future engineers safe but I feel the service contractor they have here will likely flag up 'no isolation point' directly at the boiler when they return, interestingly they offered no solutions to this issue, just 'at risked' it and left...
Read more
Continue reading...
