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circuit

  1. M

    Powerline adapter on lighting circuit.

    Hi. I am a diyer and very new to anything electrical. I was hoping to put a new outdoor ip camera up outside the house. At the side of my house I have a boiler room that has a light and switch inside it. This light is fed off the light ring at the breaker as I tested it before hand. My plan...
  2. haptism

    Lighting circuit what to do

    This is a new one on me and not so sure how to tackle it. The customer is extending 3 bedrooms, ive quoted to install new lighting circuit for these rooms. The existing circuit for the upstairs lighting does not have an earth and due to its routing it will need extending to fit round the shape...
  3. G

    4mm & 6mm one circuit

    needed a 10.0mm for a air source heat pump at a property, one of the lads run a 6mm in for it, then plumber said he needed a 10.mm so he ran a 4mm in aswell,lol, is this acceptable and whats the best way to terminate if i can use both, a bit miffed cheers grand
  4. B

    Broken CPC on Lighting Circuit

    First time posting so hope this is correct place? Been checking out a Customers Premises and all is good apart from 1 lighting circuit that feeds a bedroom and office. A CPC has been run but has been damaged/broken/cut somewhere en route to first light switch. (proved by using wander lead)...
  5. M

    Secondary Transformer Circuit Breaker

    Hi, I'm just curious about what will happen if I use an MCB lower than the calculated current rating. I have a 1kVA 220v stepdown to 110V transformer, calculated downstream MCB current rating would be 11.3625 if i'm right I multiplied the secondary current to 125%? what will happen if I use a...
  6. M

    Do I need over current protection?

    Hi guys, i'm working on some project, do i still need over current protection if i'm using a soft starter and do I still need circuit breaker for that motor???
  7. H

    USA Low voltage reading on OFF circuit

    On standard residential house wiring (USA). Working on a single circuit with the circuit breaker in OFF position at the wall. When connecting a decent (Klein) multi-meter to black and neutral (white) wires I see a low voltage reading of .4260 (POINT four two six zero) showing on the multi-meter...
  8. N

    Circuit Advice

    I'm starting an electrical course next week and would really appreciate a heads up on some of the circuits on the wall if anyone could help? Thank you in advance
  9. marconi

    MARCONI'S FINAL RING CIRCUIT LIVE CONDUCTOR BREAK DETECTOR IDEA

    Over the last few days I have been stuck indoors because of the rainy weather. To pass the time I cobbled together my simple idea for a FRC live conductor break detector, ie break in L or N. I also have a working demonstrator for detecting a break in the cpc but I will/may post that another...
  10. B

    Radial circuit split 2 ways

    Hi all, working with a spark today, basically dodgy wiring in kitchen junction boxes everywhere, all ripped out, now all we’re doing is a new 6mm cooker feed and radial socket circuit, basically new 2.5mm radial circuit from CU to one side of kitchen where spark I’m with has decided to put a...
  11. KeenPensioner

    De-rating a ring circuit

    Hi, I'm not an electrician but have worked as a mate and I'm studying in my own time - I know my limitations. I watch a lot of videos (John Ward and others) and have come across an issue I don't understand. An 80A 30mA RCCD has 4 Type B 32A MCBs hanging off it and the sparky () talks about...
  12. S

    Low current device on lighting circuit

    I've had a new smart door lock fitted to the front door. In order to get best usage I need to run a small electronic device called a bridge which will link this lock to the internet via bluetooth and wifi. The bridge requires AC power and is deigned to be plugged in to a socket. It needs to be...
  13. S

    DOL Starter / automatic dust extraction system

    Could I use a DOL Starter circuit to create an automatic extraction system? I was thinking that I could replace the start button and simply wire in a socket instead. So hypothetically if I plugged in and switched on an electric palm sander, it would start up my dust extraction systems (via the...
  14. F

    System fault on panel 001 short/ circuit

    Please how do i start to check for system fault on panel short circuit. I was able to solve this problem before but now it's taking like forever and am getting frustrated please help. I am working on a Esser IQ 8000 control FACP.
  15. Gavin John Hyde

    Different sized csa cables on same circuit

    Got a house I am working in at moment, customer wants extra sockets downstairs, apart from kitchen the whole ground floor has just 3 double sockets. The current sockets in the lounge/diner are fed by a 6mm twin and earth( from old cooker circuit that was rerouted when a gas cooker went in) and...
  16. rolyberkin

    Fault on MI cables on outside ligting circuit

    I may be being a numpty but here goes, I had three hours today to sort this out and had to leave it disconnected in the end as had other urgent committments. Client has an outside light which is tripping RCD, this is fed via a fused switch from a rfc this circuit also feeds an adjacent fuse...
  17. Zdb

    Expected circuit length (R1+R2)

    Came across this table from on old thread: Is there a table of expected R1+R2 results in BS7671? - https://www.electriciansforums.net/threads/is-there-a-table-of-expected-r1-r2-results-in-bs7671.103412/ I'm just wondering if anyone has the original or a more detailed version that they...
  18. 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...
  19. 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...
  20. 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...
  21. 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...
  22. 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...
  23. 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...
  24. 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...
  25. 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...
  26. 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...
  27. 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...
  28. 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...
  29. 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...
  30. 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...
  31. 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...
  32. 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...
  33. 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...
  34. 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...
  35. 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
  36. 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...
  37. 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...
  38. D

    Radial final circuit

    Hi guys, just started rewiring my house, and noticed the sockets in the attic wired in radial instead of ring. Can I leave it in radial? There are only 2 sockets up there, unlikely there will ever be much load on it. I was thinking of wiring it 2,5mm2, (as it is now) on a 16A beaker. Any...
  39. A

    Domestic Unable to separate wires on ring circuit

    Hi folks, I'm in the process of adding some more sockets into my "Socket" ring circuit. My plan was to open up the existing socket, cut 1 twin and earth higher up and add a socket there, leave the other twin and earth where it is then do a small ring of 4 sockets, starting at the existing socket...
  40. L

    Light fitting trips one RCD, but not if connected to a different RCD

    Hi, I have a lighting circuit which trips the RCD, I’ve got pared back so that if I take one brand new light fitting and wire it directly into the consumer unit with a brand new cable - and still the RCD trips. If I remove that wire from the consumer unit and put a 3 pin plug on it, and plug...
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