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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

    short circuit test and resistance to earth test on combi

    hi all if i do a short circuit test on combi boiler between live and neutral when isolated, if i find a short circuit then i believe that i am supposed to disconnect wires from pcb to each component and test wires and component for short circuit, but how do i test for short circuit on wires and...
  2. N

    pump query

    hi all, A very simple question for most of you but want to check first - not seen the job yet. The pump is a wilo pump on a gravity fed system with a potterton boiler that keeps locking out. This pump is making a gurgling noise when the hot water is boosted, not when the CH is run. Is this...
  3. I

    Vaillant combi with underfloor heating?

    Hi there, Im trying to see if is possible to run a wet underfloor heating system and conventional rad circuit from a Vaillant 937 combi boiler, with a 430 weather compensator. I have rung Vaillant and they recomend using the vr61, vr81, with other pipe sensors, a low loss header and a...
    • ian_black
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    • boiler central heating system circuit combi header ufh under floor heating underfloor underfloor heating vaillant weather
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  4. H

    Honeywell dual programmer recommendation

    Hi, I've got a CWSC / Hot water cylinder, run on oil and my programmer has 2 on/off settings. Trouble is that controls both hot water and heating. Don't want to leave heating on constant as not there daytimes and not all rads have trv's The thermostat is wireless and is a pain in the r5e...
  5. J

    Back boiler plumbing circuit

    Plumbed this up last week an having a problem with it, the gravity flow from the stove works fine, its just when the pump for the stove kicks in the return from the rads seems to go up through the coil instead of back to the stove, put a gate valve on the return link which helped but still not...
    • Japnut04
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    • Forum: Plumbing Jobs | The Job-board
  6. J

    Ideal Mexico Gravity DHW

    Hi All, My First post and new to plumbing and heating. I’m looking for some technical advice regarding an Ideal Mexico Slimline RS 3/50. I have an installation which currently uses a Gravity DHW and Pumped CH with all 4 tapping being used in the boiler. All pipework is 22mm and not...
  7. D

    spur or own elec supply to boiler

    can anyone clear this matter up for me,i was told of an electrician friend that all heating systems should have there own independent supply from consumer unit,i have and i'm sure many others have got the elec supply from a spur or even in some case put a 3 point plug 3amp fuse and away you go...
  8. K

    airlock on combi boiler primary circuit?

    right ive got a problem after draining and filling a combi heating circuit to change a faulty rad valve. ive never had an airlock before on combi systems, but anyway the problem is that after all rads bled, all work as normal apart from one on the ground floor which only gets luke warm...
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    • Forum: Plumbing Jobs | The Job-board
  9. C

    Ideal miniHE - DHW excessive temp on primary circuit (lights) after plumbing work....

    Hi all Can anyone help? My boiler: Ideal C24/C28 mini HE. 3 years old. Draining the system down to add the rad, the water was nice and clear though we are in a hard water area. 3/4 days ago a gas safe plumber extended my gas feed to my kitchen for a new range and extended the central...
    • capitanpugwash
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    • Forum: Plumbing Jobs | The Job-board
  10. E

    Gravity Circuit Issue. Advice Appreciated

    Hello, I've just replaced an oil-fired range with a wood burning range. I have installed a gravity circuit in accordance with the maker's spec. I have water flowing very nicely around the circuit, however, it is returning through the cold water feed rather than the gravity return as the heated...
    • Edgy
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    • Forum: Plumbing Jobs | The Job-board
  11. I

    Circulating pump problems on primary circuit

    I have been plumbing mainly on bathrooms for sometime, and lack experience in heating systems. I am hoping someone can help me out. I am working on a boilermate 2 thermal storage cylinder. There was a leak from the vent pipe between the top of the cylinder and the header tank. I drained...
    • IST
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    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  12. J

    wood burning stove problem with hot water circuit

    Recently installed wood burning stove - gravity fed indirect cylinder and pumped radiator circuit. Once the flow pipe from the boiler gets too hot to touch on most occasions the stove boiler starts hissing and the return pipe is always luke warm. To get around this problem we activate the pump...
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    • Forum: Plumbing Jobs | The Job-board
  13. M

    worcester printed circuit card for fault finding

    anyone seen these? we went on a course for fault finding and commissioning and were given a card that you insert into the block connector for pcb, instead of using the pins off your multi meter on the block you then use it on little holes on the card which is labelled for the different...
    • moony
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    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  14. S

    Underfloor heating from radiator circuit

    Friend of mine wants to install wet underfloor heating in an extension. He has a "normal" boiler and radiators. Can this be done? Is it economic? He's been told that he can have a separate zone and thermostat. Will the boiler cycle a lot if this is the only zone active? I'm assuming...
    • SmogLee
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    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  15. G

    air and gas circuit default at the same time

    Hi there. I've got Saunier Duval boiler. It shows that the falt with the air and gas circuits have been detected. I've checked the fan (OK), air switch (OK), also replaced ignition P.C.B, still nothing Any ideas? Help!
  16. B

    Primary circuit water boiling over

    One of my customers has a standard vented hot water and heating system. The boiler is oil fired, the pump is on the return to the bolier and it has a 3 way diverter valve with normal controller, room stat, cylinder stat etc. When the hot water or the central heating or both are called for the...
    • Brooksie
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    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  17. B

    Bathroom radiator / heated towel rail plumbed into hot water circuit

    People talk about how their bathroom radiator or heated towel rail is plumbed into the hot water rather than the central heating circuit. This means when the central heating is off the radiator can still get hot (to dry towels etc). How is this achieved? Does the radiator have to be plumbed...
    • Brooksie
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    • Forum: Plumbing Jobs | The Job-board
  18. M

    Function of Bypass Circuit

    I have what appears to be a conventional central heating system, heated through a Potterton Prima Gas Boiler. The pump feeds into a 3 port divert valve feeding rads and hot water tank. There is a bypass between the pump and the valve. The system is vented on the feed from the boiler and the...
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    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
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