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In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type of switch is an electromechanical device consisting of one or more sets of movable electrical contacts connected to external circuits. When a pair of contacts is touching current can pass between them, while when the contacts are separated no current can flow.
Switches are made in many different configurations; they may have multiple sets of contacts controlled by the same knob or actuator, and the contacts may operate simultaneously, sequentially, or alternately. A switch may be operated manually, for example, a light switch or a keyboard button, or may function as a sensing element to sense the position of a machine part, liquid level, pressure, or temperature, such as a thermostat. Many specialized forms exist, such as the toggle switch, rotary switch, mercury switch, push-button switch, reversing switch, relay, and circuit breaker. A common use is control of lighting, where multiple switches may be wired into one circuit to allow convenient control of light fixtures. Switches in high-powered circuits must have special construction to prevent destructive arcing when they are opened.

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  1. B

    Surestop water switch.

    Hi all. Due to current location of the existing stop tap, I was thinking about installing a sure stop water switch as part of an upcoming kitchen refurb. Anyhoo, have come across a post where several people have suggested ripping them out. Are they really that bad? A sure stop would definitely...
  2. J

    Hyco Electric Boiler - switch off for occasional use?

    Do I switch off Electric Hot Heater Cylinder over Winter? I have a 30 litre Hyco Electric Boiler Powerflow for hot water. Only used for domestic hot water (not general heating as have electric underfloor matts) It is for an annex, gets occasional use in winter. Product literature says...
  3. S

    does the power switch to the cylinder need to be left on ?

    Hello i have a 300l centre store unvented indirect cylinder. does the power need to be left on for this ? is it left on to keep water at temperature all day ? for a previous system i had a power switch for the immerison heater that was only turned on in an emergency thanks
  4. B

    Unable to switch off external stop valve

    I need to switch off my water at the external stop valve to do a permanent fix on a pipe between that valve and my internal stop valve. There is no tap to turn on the external valve, just a round nozzle with no obvious way of twisting it. Thames Water is not responding. Any advice on how I...
  5. P


    I currently live in a 4 bed end of terrace victorian house, with 11 radiators and two towel rails. Currently have installed a 6kw potterton gold electric boiler, which heats a hot water cylinder and provides heating to the radiators. My electricity usage is extremely high and killing me...
  6. T

    Drain Central Heating System- when is it safe to switch Boiler back on

    Drain central heating system (water tank in loft) in a two storey house - ground and first floor when is it safe to switch the boiler back on - is it only when the tank in the loft has stopped making a noise - implying that the system is back to where it was before the system was drained. The...
  7. H

    Switch off Alpha weather prod sensor.

    I have a Alpha weather prod I wish to install. Can you put an on off switch in between the sensor pod and Alpha boiler. If yes what type of switch do I need. Thankyou
  8. M

    Immersion Heated Switch

    Hello, We have a water tank and with all the Energy talk at the moment, we’ve been told to check that the immersion isn’t on all the time! We have constant hot water so my assumption is that it has been left on. This may sound like a stupid question but is the the correct switch to keep...
  9. W

    Oil Central Heating Switch

    I have an oil heating system, and also I have an open coal fire , the coal fire also heats the water through a back boiler and a neutralising tank , when the coal fire is on the water starts boiling, the only way i can stop it is to put the oil central heating on to circulate the water, is their...
  10. C

    Set fan operation switch

    Hi, here is my question: my house 's central air conditioner has gas Heater and electric A/C, which fan operation I should switch in the thermostat? gas or electric? here are the manual instructions: Set Fan Operation Switch, Move the switch to the proper setting: - Gas or Oil: For gas or oil...
  11. taffyinhighlands

    parallel hot water tanks - can switch to single as well as dual use?

    I've got a DHW system with 2 storage tanks run in parallel - everything is well set up for the 2 tank operation, but other than completely removing one tank, and draining it to avoid legionella risk, is there a way I can keep both hooked up but only run the single tank (system was installed for...
  12. R

    Swapping a Danfoss valve for a Honeywell

    Kingo. Did you resolve your 3 port valveswop re wiring.
  13. J

    Plumber or electrician to replace new timer switch Unvented cylinder

    Replace the current E7 Newlec Economy control to a mechanical 24 hour timer switch for unvented cylinder water heater, may I know if I ask plumber or electrician to do this job. Because Newlec Economy controller can heat up water once a day in midnight .I would require constant hot water in...
  14. D

    After new rad fitted boiler doesn't want to switch on

    Hi Could you give me some advice based on the following points below? System background (small cottage) it has ---------------------------------------------- System Gas boiler ground floor Greenstar Ri think its a 15; Two gravity fed header tanks in the loft one small one for the radiators...
  15. W

    heatmiser RF switch not enabling boiler

    Boiler is a Viessmann 100-w (2021 version) heatmiser uh8-rf heatmiser rf switch (intended for boiler enable only) Heatmiser neoair thermostats I live so far north that there isn't a Viessmann installer local to me, however after speaking to Viessmann my local heating engineer was placed on a...
  16. K

    Cant switch off Hot Water

    Trying to switch off the hot water so I can change the Bathroom taps. Never 100% sure of what we actually have but its a cold water tank in the loft, feeding a cold water tank in an airing cupboard. Theres three Red Valves in the airing cupboard, I've tried each one in turn to close it off, then...
  17. M

    How To Fix Spout To Shower Head Switch?

    Hi All, Been doing a bit of self-fixing recently and got stuck on this repair. What should I be expecting and how do I go about fixing the switch? As you can see in the pictures the pull handle just came out completely. Thanks.
  18. C

    URGENT Oil Rayburn - float switch flips off before oil reaches wick

    Hello all, we just moved into a house with a oil Rayburn range as the primary source of heating, but it has been off for about 10 years. We havent had any luck finding an engineer or knowledgeable person due to our extremely remote location and covid 19. the problem seems to be that as oil...
  19. T

    Boiler power cable on hot pipe and water pipe pressed on isolator switch

    hi, I’m wondering, is this cable safe to be going around the very hot copper pipe as it is and is the white pipe okay pressed against the isolator switch? Gas engineer came to do it today. Just seems a bit risky to me so wanted to check I’m not going die if something leaks or gets too hot.
  20. Stanios

    Promax/ Performa hot water switch

    I am sure everyone is familiar with these and the common diaphragm replacement cure for drips and no hot water fix. Just the other week replaced a diaphragm it looked pretty good I put new one in anyway. The pin did come out but only when the tap was half way on at least. Pressure in the house...
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