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electrical supplies and boiler control wiring

Discussion in 'Plumbing and Central Heating' started by mspark, 25 Sep 2008.

  1. mspark

    mspark

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    i have recently questioned a corgi registered plumber who fitted a combi boiler in a loft,his heating engineer (so called spark) has installed the supply to the boiler via the programmer which is downstairs, i have already disconnected this supply as it was a 1.0mm cable protected by a 32a mcb!,i always take a supply to the boilers terminations first (via a sw/f spur or 3 pin plug) then away from the boilers pcb if i fit any external controls ie thermostat,programmer. can anyone confirm to me that by doubling up the supply at the programmer then to the boiler is wrong as i think it is because of the length of flex being over 2 meters?
    thanks
     
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  3. Would the real spark stand up please.
     
  4. twgas

    twgas

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    dont think it matters whether it goes from mains to prog to boiler or main to boiler to prog.

    dont see how it will be more than 2m one way and not the other
     
  5. namsag

    namsag

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    Most sparks have not got a clue how to wire heating,not slagging just talking from experience. Minute you go to a fault and they say i have had an electrician look at it your first thought is fek fek fek here goes what has he done.
    There is nothing up with taking the boiler LNE from the LNE that supplies the clock as oppossed to taking both from the fused spur outlet ,rarely would the clock LNE be taken fom the boiler due to the size of the terminal strip within the boiler. Talking combi`s here
    A spark would know the regs on using flex or cable and whether it needs to be heat resisistant on final connection to boiler

    What sort of socket would you use if you used 3 pin plug
     
  6. i agree with namsag, i have met electricians on site who are confused by a honeywell room stat. Also, i was pulled up over using flex, without trunking, the flex was clipped to the wall out of harms way, and was clearly visible, the flex will never ,er, flex. Yet my missus sits with wet hair, 240 volt hairdryer in hand, on 13 amp fuse, with chinese flex, and survives :(
     
  7. simond

    simond

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    Nothing wrong with using flex if suitably supported, protected where necessary, and dimensioned suitably for earth loop resistance etc.

    Surely mspark cannot be one?

    Or is she Ms Park??
     
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  9. mspark

    mspark

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    yeah i can see why your name is stumpy dick just wondering if its visible on ur head
     
  10. calm down dear :D The gag was refering to your name/ so called spark
     
  11. mspark

    mspark

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    firstly reason for plug top is some plumbers cannot figure out how to disconnect from a sw fused spur, secondly i do believe that the terminations and cable entry points are smaller within the programmer also most combi boilers instruction manuals all show supply to the boiler first then all other control wiring from the pcb within the boiler as u normally have to remove the factory fitted link due to it causing a permanent supply onto the calling for heat termination ie switch line,
    surely its good practice to supply the main boiler first.all i can say is i have seen a lot of combi boilers installed in the last 10 yrs and this is the first time i have seen a supply wired via a programmers terminations
    thanks for the reply anyway
     
  12. mspark. you are correct. mains voltage needs to be supplied to the combi LNE terminals. reading the manufacturers instructions will tell you if the controls are volt free, or 2 amp protected via pcb fuse. the rest you should know already.
     
  13. namsag

    namsag

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    Mspark you are forgetting that the two sides of the external clock are completly seperate it still has to have a LNE for the clock function.
    Then the switching circuit power of the clock comes from the combi .
    Best way would be 2 separate LNE from fused spur 1 to clock 1 to boiler, but if for whatever reason this is not done the connections within most clocks are better than boiler connections and less fiddly.

    As for plug socket it must be one without a switch so that to isolate plug must be removed. As a switched socket would prob not be double pole
     
  14. mspark

    mspark

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    why thank you mate i was sure but didnt want to have a go without knowing the facts.thanks for the info
     
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