circuit


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  1. R

    Domestic Twin PIR on 1 lighting circuit with cut off switch

    Hi, Trying to plan for my single outside lighting circuit to be controlled by two PIR's. I've tried to draw it out (image below). My plan is that if the PIR switch is on and light switch is off, the lights will run with PIR. If the PIR switch is off, and the light switch is on, then lights...
  2. M

    Tapping into cigarette lighter circuit

    Just wondering how many times I can safely tap into a cig lighter circuit. I’m getting a dc to dc 5v converter and wiring in a USB port into my car using the cig lighter. Plus I wait about in my car a lot so often need a charger, but my battery was dead when charging my phone last time I had it...
  3. A

    Commercial Radial circuit help

    Hi, I went to look at job; it is a 2.5mm2 radial coming from the CU (from a 32A MCB) to two sockets and the sockets are using two appliances which are a 3.6 kW combi oven and a 2.5 kW 2 plate electric hob, what i've been told that it trips at the CU and sometimes it doesn't trip and the...
  4. N

    Domestic Outside PIR light circuit board fix.

    I have a set of six matching PIR outside lights. They are all the same style and are no longer available. On two of them the circuit board has developed a fault whereby the light level at which they become active works fine but once activated, the time for which they stay on has become infinite...
  5. S

    Lighting circuit contactor

    Hi all I am replacing a contactor in a communal block of flats I believe it for the external and internal lights. Am replacing like for like but it doesnt seem right to me. Looks like its been messed about with previously? The old contactor had an a2 terminal at the bottom aswell whereas the new...
  6. X

    Domestic Using an old 32A shower circuit for new sockets.

    Nearly fifteen years ago I moved a bathroom in our house, and repurposed the 32A electrical shower circuit to power a pair of double sockets - which then had multiway adaptors powering all my office hardware (i.e. low overall power). Not exactly complex or risky at the time, and the MCB has...
  7. J

    What tests for new radial circuit

    Job is to install one or two new sockets in a commercial premises. Possibly on a new radial circuit or an extension to ring. If extension on a ring them a Minor electrical certificate is required together with all relevant testing. However if a new radial circuit is the way a full EIC...
  8. T

    AM2 lighting circuit - confusion

    I know this has probably been asked a dozen times on this forum but I just want to make sure that I'm doing this the correct way before going into my exam. I got told that in the am2 I need to have neutrals at every switch in connecters. I have never done it this at work hence the confusion...
  9. Bobby34

    Circuit passing through Bathroom zone

    Hi guys and girls, So im fitting a new ring final circuit (I did advise a radial) in a newly built extension. the least disruptive way of feeding the cables to the extension is up into the ceiling void and along through the 1st floor bathroom floor (The client has had the common sense to not...
  10. D

    Altered ring main, now a DIFFERENT circuit is not working?

    I’ve just altered a ring main by taking 1 leg out of the board and taking it to a spur (then taking a leg back), to add a socket in. After doing so I’ve turned the board back on and everything is working as it should, other than cooker circuit (A radial feeding the cooker/hob, extractor fan and...
  11. K

    Wiring a switch in a light circuit

    Hi everyone, I hope someone here can shed some light on this for me please, I have come across two forms of wiring 2 way switches. I understand the basics behind these, first one with live coming from the light and switched live going back, second using same rule but in com instead of l1 and...
  12. C

    oven circuit but not what i normally expect

    a 20a RCBO supplies a 6mm twin and earth cable that supplies a dedicated socket mounted securely below the oven. The dedicated socket is controlled via a 40a double pole isolator above on the counter top. It appears at some point a juicy oven has been replaced by a much lower 2.2Kw oven on a...
  13. N

    Domestic where to switch a 12v LED circuit?

    Hi all. new to this and hoping someone can pity on me! I've bought a LED light tape kit which comes with a 3pin 12v transformer. I plan to put the LEDs to back-light a mirror on the wife's bedside table (she looks better in dim light!!!! :) The transformer will plug straight into a normal 3...
  14. N

    Domestic CAn I wire 12v downlighter transformer into dimmer circuit?

    Hi all. I've bought couple of LED tape kits which come with a 3pin 12v transformer. one of them is now wired into a simple circuit which is a single on/off switch and works great. the second set is to go into another room, again single switch but this time it's a dimmer not toggle. The kit is...
  15. G

    RCBO socket circuit tripping.

    I'm stuck here fellas. I have a radial with only one double socket outlet in 2.5mm T&E on a 20A RCBO running five meters in surface mounted trunking. TN-S, R1 and R2 good, 243V measured, Ze 0.12, Zdb 0.29, Zs 0.36, IR all +200MOhms. RCD trip tests all ok at 0 and 180 and ramp 24mA. Now these...
  16. chris83

    Adding to kitchen wiring does cooker circuit need RCD protection?

    Hello all, first post by a new member so apologies for any posting faux pas in advance. (Hopefully this is the correct place to ask this rather long question) I’m in the process of re fitting my kitchen and was planning on making a couple of minor changes to the wiring installation. All of the...
  17. D

    New circuit to detached shed/garage in garden.

    Hello I am new to this forum and need a little help from an experienced spark to help me design a circuit to wire a detached garage (two sockets and ceiling lights) from a house ring main to 18th edition standards. This will be notifiable so everything has to be pukka. Cable can be in steel...
  18. M

    Domestic No Earth in light circuit

    Hi, I have an looking to replace some plastic surface switches and I have noticed that there is no earth wire. So I don't think I am going to be able to any metal fixings. What are my options. Just leave it as it is. Look to get the circuit re-wired. Thanks
  19. Pretty Mouth

    Short circuit disconnection times

    Could someone shed some light on the following please? 411.3.2.1 implies that the 5s / 0.4s disconnection times only apply to earth faults. I've not found anything else in the regs that suggests they apply to short circuits. 435.5.2 says faults should be disconnected before the fault current...
  20. Ironbones

    Commercial DC circuit breakers VS semiconductor fuses high speed.

    Hi all. Just to start off still learning. Could any one help me with this and put me right if I am incorrect. I would like to understand the preference or reason for opting for DC breakers or semiconductor high speed fuses, when been used in low voltage DC circuit. I understand that...
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