central

  1. K

    SELV and 230V circuit separation

    It is planned to install a central 24V SELV supply in a domestic residence, e.g. to power LEDs. According to my reading, BS 7671:2008 chapter 414.4.1 (ii) requirements for protective separation between a SELV and 230V circuits offer the following options a) double insulation -or- b) reinforced...
  2. B

    central heating fed from spur

    bit of advice please guys. when doing a pir or cu change do you test the central heating wiring which is fed from a fcu off a ring or radial circuit. thanks neil.
  3. S

    Central Heating courses

    Can anyone recommend a good central heating course ideally covering s and y plan, underfloor heating systems and maybe ground source??? By the way, has anyone done the NIC PV course? The lad I work for has just done it and said it was a total waste of time and money with roofers and kitchen...
  4. S

    Central Heating courses

    Can anyone recommend a good central heating course ideally covering s and y plan, underfloor heating systems and maybe ground source??? By the way, has anyone done the NIC PV course? The lad I work for has just done it and said it was a total waste of time and money with roofers and kitchen...
  5. K

    PIR required central Notts

    Anyone in the Nottingham area interested in doing a commercial PIR in central NG1 area. I can’t do it so I said I’d try and find someone to do it for them, they have a fire inspection due at the end of August. Please PM me if interested.
  6. S

    1 central or multiple string inverters for 50kW system

    Does anyone have an opinion on the route to go for a 50kW system that either has 1 large central inverter or many smaller string inverters? My immediate thoughts are: 1. If some of the panels or inverters drop out then at least remaining parts of array will produce energy for a system that uses...
  7. A

    Bonding central heating pipes

    Cross bonding central heating pipes, good practice to wire in 4mm2 ? any thoughts...
  8. B

    Central Heating Controls

    Hi, Does the wiring runs and wiring up of central heating controls come under BS7671. Would a cert be required for this type of work. Thanks in advance
  9. D

    Domestic central heating need help.

    Hi im new to this board so sorry if this is in the wrong place. Currently there is work going on in my house and the boiler is moving from one room to another along with time clock and thermostat. Now there was a 3 core from time clock and a 3 core from stat going to boiler spur with 5 core flex...
  10. R

    Main earth bonding on plastic water mains and pipe?

    Can anyone tell me if you still require main earth bond to the incoming mains water. All the pipework and central heating is plastic (except 1m of copper from combi on water and central heating). The boiler is about 5m away from incomming mains. Also the mains is a minimum of 5m of plastic MDPE...
  11. Worcester

    Central Networks no longer e-on

    Just seen this on the e-on site: Anyone noticed any differences yet?
  12. L

    Electric Underfloor Heating Vs Water Pipe Underfloor Vs Central Heating

    hi guys In two minds about underfloor heating, am wondering what the advantages and disadvantes are with these types of heating. I´ve installed a few electric underfloor heating systems but only on a small scale. Never come across the water pipe underfloor heating, what do you guys think is...
  13. M

    G59 Relays???

    Does anyone know if G59 relays are absolutely mandatory for every system above 16A/phase? Someone has said that if you install a sunny tripower 10000TL you don't need to install a relay as it has the adequate G59 protection incorporated? I know this is a bit of a grey area but I'm hoping someone...
  14. S

    Central heating price work

    Hi all Just wondering what kind of rates you guys would expect if doing price work on installing central hearing systems. Bonding has to be upgraded if not there and all main earths 16mm regardless of supply due to the contract. Combi, y and s plan prices please. Also please add for the need...
  15. B

    help central heating programmer

    Been called to a job where the client tried to change a central heating programmer. He took the wires out the backplate and forgot to note down where they went! Monkey! So I have the brown and blue from spur which go to L and N of the back plate but then I also have a brown and blue from...
  16. I

    central heating pipe over capped cables

    common sense tells me that over time a hot central heating pipe over my capping for socket is bad news,an is there a minimum distance a socket should be from radiator?i av put my points were builder asked then plumber has come along an done this ready to be plastered over.way i see it 1st in...
  17. S

    My first central heating job

    My first ever central heating job. Simple combi replacement. Timeclock and receiver wired in for wireless stat. Happy days.
  18. K

    Fire Rated SP&N Distribution Boards

    Does anyone know of any manufactures that produce fire rated boards? Its for 110v DC emergency lighting. Cheers
  19. D

    Wireless control of Valves in a Y Plan Central Heating system

    Does anyone know if any companies do wireless control of the valves in a Y plan system? I have looked at the Honeywell solution using ST9420C as the controller but this is WIRED. The room stats (DT92E) are wireless to the controller though which is a start. What I ideally want is a system...
  20. C

    Central network checklist.

    Im abit confused. Hope some1 can help. We've just finished wiring 8 small office units. Each one has a sub-mains, fed with a 3c 16mm swa cable. All are ran back to a central point in the metre building. I am going to run all the SWA's on cable tray into a 3 phase consumer unit with seperate...
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