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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. 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...
  2. 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...
  3. 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...
  4. R

    Swapping a Danfoss valve for a Honeywell

    Kingo. Did you resolve your 3 port valveswop re wiring.
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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.
  10. 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...
  11. 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.
  12. 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...
  13. N

    Vokera 29HE air pressure switch issues

    Hi Guys was wondering if someone could help me out with a Vokera compact 29HE. Had been called out it last year and boiler was only firing up with cover off so replaced fan venturis. Called back today and venturis are clean. Heat exchanger is spotless with no debris between fins causing flow...
  14. B

    Gas supply and automatic interior switc

    Gas heating is set to come on 2hours per day via interior automatic switch. I would like a neighbour to go and turn gas supply off at mains as she has no key. I am away. Is this safe? but i but I want a neighbour to
  15. E

    Air switch leaking on whirlpool bath

    Hi, I have a Spa/Whirlpool bath and the on/off switch is letting water in from the top of the chrome switch. There is only a slight gap as can be seen in the first picture, but when showering, water gets into the switch and then comes out of the two small holes in the bottom of the switch, as...
  16. P

    Diverter switch replacement advice

    Hi just seeing if someone can offer some advice before I go and order the diverter switch. I have a glowworm 100e boiler Over the last few months the boiler on on occasion been making a funny noise every now and then at night, like a clicking. Now the boiler is blowing the pcb fuse, I've put...
  17. B

    by passing a float switch

    Hi there, i am trying to by-pass the floating switch in a well water tank, in order to use the water directly from the well. currently, i can only use water post tank unless i disconnect the float and have the tank overflow ! I remember there is a way to do this, Hurricane Irma destroyed the...
  18. D

    Advice on suitable thermostat and switch

    I've an old (50yrs) oil boiler that is manually switched on and off using a light switch outside the boiler room. The only thermostat is the one built into the boiler. This is usually set fairly high and never touched. The light switch is use to switch on and off the boiler as heat is needed...
  19. siricosm

    Is a flow switch really necessary?

    I am contemplating installing a heat bank type thermal store, with an external plate exchanger for DHW. The pump on the primary (tank) side of the plate exchanger is usually controlled by a flow switch on the DHW side. I am thinking to use a modulating pump (Grunfos apha2) and a thermal...
  20. B

    Orkli VZ-2V valve.I can't find info. on this.(normally closed?-Wiring?)

    Fault seems to be an Orkli VZ-2V in a log burner/buffer tank system.The valve is difficult to access & I can't find info.Is this a 'normally closed'valve(open when powered)?Does switch send 230v from grey wire to orange at end of run?