• Welcome to PlumbersForums.net - The international free plumbing advice forum. Professional plumbers sharing advice with fellow plumbers and DIY alike. Register for free today! - Checkout the Plumbing Advice forum and then our Plumbing Videos area which still needs populating.


Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets, and light fittings in a structure.
Wiring is subject to safety standards for design and installation. Allowable wire and cable types and sizes are specified according to the circuit operating voltage and electric current capability, with further restrictions on the environmental conditions, such as ambient temperature range, moisture levels, and exposure to sunlight and chemicals.
Associated circuit protection, control and distribution devices within a building's wiring system are subject to voltage, current and functional specification. Wiring safety codes vary by locality, country or region. The International Electrotechnical Commission (IEC) is attempting to harmonise wiring standards amongst member countries, but significant variations in design and installation requirements still exist.

View More On Wikipedia.org
  1. bunkotungus

    Boiler receiver wiring - Danfoss RX1

    It used to work. But the wire got tugged and pulled all the connectors out (except the grey one, that's still in the correct place). I tried to wire it up again in the below pic but the hot water isn't coming on. Boiler is a Grant Vortex Pro External 26kW oil combi. Since the below pics have...
  2. J

    Wiring a horseman 425 tiara

    Hi,I wish to change a 600 switchmaster heating timer with a horseman 425 tiara.i have connected all the wiring as per instructions.i have however noticed a loose yellow wire on the switchmaster,it looks like it should be connected to term 3 . Is this correct. And when I get round to changing...
  3. M

    Wiring centre for 1UHF and 2Rad zones

    Hoping someone knows a wiring centre that fits this requirement. I have 1 UFH zone (3 circuits) and 2 Radiator zones. Was looking at the Heatmiser UH4 wiring centre schematic, it shows that I can only use zone-4 for a single radiator zone. By selecting the dip switch to not engage the UFH...
  4. J

    Wiring Help Needed replacing a Horstmann C27 with Flomasta 7635

    Hello - I'm a relatively new owner of an old house here in France that was updated by the previous owner who lives in the UK. He used one channel of a two channel Horstmann C27 to control turning on and off the electric water heater. Given that I'm from the states, I'm not all that familiar with...
  5. T

    Additional Wiring for New Boiler?

    I’m in the process of getting quotes from heating engineers to replace an old Ideal Classic LX boiler. My dilemma I have is not so much the difference in prices quoted - I expected that - but the advice being given regards: what to replace it with the need for additional wiring or not My...
  6. D

    Thermal Actuator wiring

    Hi i am not a plumber, nor am I an electrician. Just recently purchased an underfloor heating thermal Actuator. The wiring is as follows, brown, blue, black, grey. The old actuator is red, red, yellow, yellow. can any one tell me what colour matches with what colour? Thanks
  7. J

    Vaillant system set-up help

    Hello, I’m hoping someone can help as I’m getting differing advice every time I speak to Vaillant; We are refurbishing a property and installing a Vaillant Ecotec Plus 630 system boiler with a Megaflo cylinder. We are creating 4-zones: Downstairs rads Upstairs rads Bathroom underfloor heating...
  8. kris

    Danfoss Randall Set2 wiring

    Hi there, I've a Danfoss Randal set2 to replace next week, I'm simply looking to obtain the installation manual for the old timeclock, I haven't attended the job yet I've only had a picture sent from the Tennant so I've not checked the wiring, so today I scoured the Internet to try and...
  9. D

    Single Zone UFH addition to main system wiring

    Advice needed please: I have an UFH installation as part of my main CH system. The UFH will never be required in isolation to HW or main CH, therefore keen to wire it completely independently of boiler and main wiring. All I want to achieve is the following: A new Room stat (in the location...
  10. H

    Advice on a JG UH3 Wiring Zone and how to stop the UF pump running when the HW timer kicks in

    Hi all. First post. I have a JG UH3 wiring zone and I've noticed that the UFH pump always comes on when the HW 'circuit/thermo' is triggered. Hence - rather than just heat the water in the tank - I also heat the UF circuits. I can't see a way to avoid this - it may be the way the circuits...
  11. IanHoll

    External Controller Wiring

    I recently had a Worcestershire Bosch 8000 Lifestyle installed but they also installed the inferior ESI control panel and wireless thermostat. I've just purchased Worcestershire Bosch's CT-200 EasyControl with the RF key. The app is paired with both the RF key and the thermostat and I can see...
  12. D

    Thermostat change wiring

    Hello I'm wanting to replace an old danfoss thermostat with a newer RTSI the danfoss has a live wire link to com. Can I just take that out with the new thermostat? See pics. First two pics are the old danfoss last pic is the new Drayton.
  13. R

    3 wires from cylinder stat to programmer wiring help with pics

    Hi Just had a new boiler system and smart programmer fitted (salus IT500) Plumber wasn't to sure if the stat was wired correctly as he wasn't clued up on smart programmers . Everything works fine on the new system apart from when it calls for heat it don't like it and I have to put it on...
  14. H


    Replacing an Ideal Mexico on a Y plan, fitting a Vaillant pure 425 with VRT 350f. normally have someone else do the wiring but can't attend. Does anyone have any experience having wired up something similar and have diagram please?
  15. P

    Hive wiring advice.

    I recently purchased a hive active heating. I currently have a Honeywell cm900 thermostat wired to my Worcester boiler. I'm just looking for advice as to how to wire the hive receiver which has the live, neutral, earth and 1,2,3,4. Please see pic of the Honeywell receiver. Just to add, there is...
  16. C

    UFH wiring

    Hi guys can someone explain to me how the wiring of UFH with the use of actuators is wired into an S plan please? its a 3 zone valve set up, Rads upstairs, HW, UFH downstairs. I'm okay with s plan wiring on a simple 2 channel etc but first time doing UFH with actuators and separate room stats. I...
  17. M

    Wiring open therm stat

    When wiring in an open therm stat. Swapping a boiler and swapping the wired stat on the wall, Honeywell one. For an open therm one. I know you take two wires I believe from the supply to the boiler to the open therm connections in the boiler. Ideal instinct. Am I right in saying open therm is...
  18. M

    Programmer/Thermostat wiring CH problem?

    Hi Guys, Hoping someone can help me, we have a 2-zone heating system that consists of 3 honeywell 2-port valves on a system/hot water tank gas boiler. Recently the HW motorised valve broke - so I replaced it (motor/housing only) and problem solved. However when diagnosing this, I also noticed...
  19. M

    little wiring help 🙏❤

    pricing up a heat only swap here just want to know what's involved. Baxi solo2 customer wants the main compact (no pump over run I believe). Haven't looked for the compact wiring diagram yet but is this going to be straight forward for me? Thanks in advance 🙏
  20. F

    Boiler Wiring

    Afetrnoon, I have had a new boiler fitted and the plumber didn't connect up the controller, the boiler only works by the on - off switch. I an an electrician but don't normally deal with central heating and need some advice on how to connect up the controller. The boiler only has a L and N...