circuit

A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by an overcurrent or short circuit. Its basic function is to interrupt current flow to protect equipment and to prevent the risk of fire. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
Circuit breakers are made in varying sizes, from small devices that protect low-current circuits or individual household appliances, to large switchgear designed to protect high voltage circuits feeding an entire city. The generic function of a circuit breaker, or fuse, as an automatic means of removing power from a faulty system, is often abbreviated as OCPD (Over Current Protection Device).

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  1. C

    Vaillant circuit board / diverter valve query... Vaillant experts needed!

    Hi, Noticing that the heating wasn't working I've changed the diverter valve on my vaillant turbomax (installed 2006ish and only ever used for hot water... Until now) The diverter valve can be set manually (frigged) to make the boiler deliver hot water or CH, but won't switch...
    • Crusty
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    • board boiler circuit connector diverter diverter valve engineer experts needed query vaillant valve water
    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
  2. C

    Secondary Circuit Pump Selection

    Hi, Currently have 1.5" BSP isolation valves either side of bronze Wilo SB30 with upstream double check valve - ball and spring type. Question is what should I replace it with? Considerations: 1) Disappointed Wilo failed after 10 years - perhaps unfair but bearings went and impeller...
  3. D

    Towel Warmer on domestic circuit.

    Hi All, Any of you fitted a towel warmer to a hot water secondary circuit? I'd imagine they'd have to be specifically made for the purpose, not all towel warmers will be suitable because of the corrosive effect of the 'fresh' water yeh? I'm considering this for my own place but, to be honest...
  4. T

    2 hot water cylinders on a solid fuel primary circuit

    I'm wanting to run 2 hot water cylinders from my solid fuel boiler , instead of buying a very expensive large one . I already have the copper cylinders. I would like to give one priority over the other, and rely on gravity only , if possible . Is it ok to run a 28mm hot feed up , which is teed...
  5. C

    Megaflo with secondary circuit issue

    Hi. We have a Megaflow 250CL pre 2010 with a secondary circuit returning into the cold water feed. Unfortunately, the cylinder is pre-2010 which is when they introduced the separate return 3/4 way up. Anyway, the bronze pump is on a timer that is currently turned off. Last night we used the...
  6. P

    Issue with zoning a central heating circuit

    Hi there, I have recently fitted a heat only boiler in a premesis that has just been halfed into two different sections. Central heating only (no hot water circuit as it was not needed) The first section is to be used as a office and the second section is to be used as a living area...
  7. P

    Issue with zoning a central heating circuit

    Hi there, I have recently fitted a heat only boiler in a premesis that has just been halfed into two different sections. Central heating only (no hot water circuit as it was not needed) The first section is to be used as a office and the second section is to be used as a living area...
  8. B

    Worcester Bosch 40CDI - Bypass Circuit help required

    Hello, We've had this 40CDI boiler fitted in place of a Potterton boiler that failed after 16 years of service. The system is configured as an S plan as I would understand. We've got a fairly large house with 3 bed's and loft office. Total radiator count is 13, all have thermostatic valves...
  9. D

    Gas boiler: correct layout of bypass circuit

    Folks, I'm new to the forum and a DIY chap. This is by far the best source of help I've found on the Web. System: 10-year-old installation Fully pumped S-plan 2 x 2-port zone valves (HW and CH) Potterton Suprima 80 Honeywell 2-zone programmer Manual room thermostat I am moving the HW vessel...
  10. T

    Gravity heating circuit

    Hi all. Looking to fit addition all rad in each room of house so will have one off of combi & one of solid fuel fire, 4 rads tops going on. Want to have gravity rather than pumped so uses no electricity. House is a 30`s chalet bungalow, any idea on sys design (already thinking 28mm tube with...
  11. M

    1930's stopcock seized on central heating circuit

    Hi, We have a cracked nut on a stopcock that is also in a tight space (two bricks high by two bricks wide). We can't close the stopcock even though we've liberally applied WD40 to it. So we are now looking for advice on how to resolve the situation. The cracked nut is under the epoxy...
    • mike_london
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    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
  12. Robert Tyrrell

    Air lock in heating circuit?

    I swapped out a radiator for a guy last week and now two radiators that are next to each other and running off the same pipework are only getting warm not hot while the radiator on the other side of the room stays stone cold. I've checked the system pressure at the boiler and made sure that it's...
  13. A

    Bathroom radiator on hot water circuit (combi system)

    Hi. Working on a 3 bedroom house and looking for some advice... Went to view a job yesterday that needs 6 rads installing and system re-piping. Came across a bathroom radiator that was heated by the hot water circuit. It's a combi system and they have teed of the HW circuit to feed the rad...
    • Andy Plumber
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    • bathroom bathroom radiator circuit heated hot hot water radiator system towel water
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  14. F

    Random radiators/towel rail not turning off

    Hi I have had a complete bathroom refurb done and have an issue with the towel rail that has been fitted as well as three radiators (on three different floors - we have a townhouse) - since the rail was connected by the fitters, they don't turn off when the heating is switched off. The only way...
  15. D

    Multifuel Stove - New Install

    Hi guys, Can i install a multi fuel stove with a back boiler to rads with no hot water cylinder & just use a pump to circulate the water? There will be no hot water for taps or anything, this is just for rads.
  16. J

    Potterton EP2002 - C/H Timer Not Working after short circuit

    I developed a fault on my Potterton system as a direct result of trying to change the in room stat (Potterton PRT2) with a new Honeywell DT90e whilst decorating my living room. I wired the new stat incorrectly which blew the 3amp fuse on the fuse spur next to the Potterton EP2002 programmer. I...
  17. M

    2 engineers 1 must be lying?

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  18. B

    Central Heating water circuit volume

    Could anyone advise on the volume of water that circulates through a GCH circuit in a 3 bedroom house?
  19. A

    Underfloor Heating - Two rooms with one circuit?

    Hello all, I am currently renovating my first home and as its just a shell now I thought it would be a good idea to install a wet underfloor heating system. The house is very small and the downstairs is completely open plan, some 25m2 and the bathroom is less than 10m2. Would there be any...
    • aia0202
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    • circuit heating rooms ufh under floor heating underfloor underfloor heating
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  20. S

    HELP! water quantity in an average 2 bedroom heating circuit

    hello guys, I hope you guys might be able to help me here. I want to size an expansion vessel for a HIU im designing. for that i have all the calculations but i have absolutely no idea that "how much water is there (approx.) in average 2 bed flats. plumbers may know the answer to this question...

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