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  1. KennyKen

    Help Regarding JK Flip Flop Question

    Hi Guys, Undertaking a PLC Course and cant seem to get my head around the pulse diagram. Which activates Q and Qbar on the Negative trailing edge. Pointers in the right direction fully appreciated i'll show you my attempt which was wrong... The Question is - Complete the timing diagram for a...
  2. B

    Basic PAT Testing question

    Hi there, Excuse if a daft question but should PAT testing include all spare cable and chargers ? ie we have several boxes of unused spares (laptop chargers etc) which are likely to never be used but kept just in case. I presume they should be tested as they could be used at any point or...
  3. T

    Bonding question

    Alright folks, Looking for a bit of advice with supplementary bonding - pictures attached for context. Bit of background - I'm in the process of repairing some metal bollards: I decided the best option was to rip out the old guts which comprised of some old fluorescents complete with all the...
  4. S

    Wiring question re new outside light

    Hi I'm replacing a PIR outside light with a new Dusk till Dawn light but have wiring questions. The new light has 2 connections, i.e. blue(neutral) and brown(live) but no earth. As can be seen in my image, for the existing light, there are 3 wires so I think the wires go: 1) black(old) goes to...
  5. A

    12v wiring question

    Was just wondering is there any reason I can’t wire 4 18w led lights onto a trailer, it will be running off the lights that’s already on it off a 12v battery through the 7 pin light cable.Anything stopping me wiring them into the side lights? planing on putting a switch in so that i can turn...
  6. B

    Fused spur question

    Hi guys, I’m running some power outside. There is a socket inside the lounge and I want to switch a supply from this out. I was thinking of a 13A FCU Next to the socket. Then out the back to an outside 2 gang socket (IP66) My main question is do I NEED to fuse down again for some lights if...
  7. S

    Extension cord usage for inflatable hot tub?

    Hello. I live in MA, in case it has any bearing. My daughters gave me an inflatable hot tub, and my question is re: using an extension cord to plug it in. I had one several yrs ago plugged into one of my outside outlets but they're not working at present (only 1 is attached to the house so I...
  8. M

    Solar panel fuse/breaker question :)

    A question/advice requested re: solar panels (the context is a van/motorhome conversion)... I've got a question re: fusing/breaker for a solar panel setup I'm installing on a van conversion - just want to sense-check my thoughts against someone else's brains, maybe someone with more experience...
  9. R

    Question about clamp meters

    Well, I say that because I don't think there is a problem other than perhaps my meter reading. Then again, it might not be a problem at all. So I had an oil heater that was tripping the RCD. Element was leaking so replaced it. Also did a complete check of all switches, terminal blocks and...
  10. Baddegg

    Coding question...

    Got a consumer unit fitted touching a gas pipe on an upcoming eicr,old rewire-able unit, no idea what came first, unit or pipe, but it’s obviously less than the 150 mm mentioned in the on site guide, I know regs are not retrospective but would that come into it in this instance?.....and how...
  11. S

    Today's Legible Dafty Question

    Formatting messed up my previous post so reposting with descriptions rather than links: <I couldn't see how to delete my previous messed up post> So I lost a brass grub screw from a BG double pole cooker control unit wit single socket and power indicator 45A. I'm reasonably sure its a brass M6...
  12. Ruairi Hansen

    Gas bonding

    Hi guys just wondering what peoples thought is on this. I was out looking at a job today and noticed the main gas pipe is not bonded at the meter but has a 10mm earth at the boiler is this a code c2, c3 or nothing?
  13. S

    Nest voltage question on Transformer

    Hello all, I'm in the UK and I'm looking to fit a 'Hello Nest' Doorbell. In the setup instructions it includes the attached screen shot (nest-screenshot.png), asking what the Voltage and Power rating are on your transformer. My current doorbell is mains powered, (see other attached file...
  14. A

    Apprenticeship question

    I've been working for a non union company for about 7 months now and still my boss hasn't signed me on as a apprentice?? Is that normal
  15. T

    3 way switch with black and white wires connected

    I have a fair amount of basic electrical experience but have never dealt with 3 way switches. I am upgrading the 1970's wiring in my attic and came across a light fixture controlled by a 3 way switch. If the 3 way switch is in the off position, the switch on the other end does not function. The...
  16. John Matrix

    The Working Away question

    Hi lads. Just wanted to talk about working away. Today we have been asked how we feel about it. Where I work don’t really work away and I haven’t had to yet. But up until I joined 2 years ago I spent 17 years on and off, on more than off away from home. It has been suggested that we may be layed...
  17. V

    Noob Question - Car Wiring

    Hello forum! First post here and electrical noob, please bear with me! Im looking into making a new fuse box in my car just to power accessories like dash cam, parking sensors, a tablet etc. My idea is to run a wire directly from the battery of the car to the custom fuse box, protected by a...
  18. T

    Main bonding to water question

    Hi folks, Just wanted to check and see if bonding is required in this situation: There's no bond to water pipework, bond to gas all present and correct There is a piece of plastic pipe at the point where the water enters the building, probably around 100mm in length There is then a mix of...
  19. R

    Electric Towel rail in Bathroom connection question

    Hi. I am fitting an electric towel rail in Zone 2 - it is IP55 rated so fine there. The flex coming out of it I have a few options - There is currently a cable going from the consumer unit into the bathroom making its own circuit (used to be for boiler but not used now) I have a couple of...
  20. L

    Contactor question

    I need to replace a standard contactor 25a That is used to pull in a 3 phase extraction fan. I called a wholesaler who said just put a 63a one in it will be fine. Surely I would be in danger of over current with this ? I've not used many contactors so want to make sure it's installed correctly...
  21. A

    Charge controller question...

    Hi all. I'm after some help and probably a quote. I posted a while ago but no response so hopefully this time I might get an answer or two. I have a 4kw solar system running through a solax hybrid inverter into the house and I have a 48v lead acid battery bank (8×6v leisure batteries) giving...
  22. A

    How do I ask a question in the DIY forum?

    That's the question.
  23. Matt

    TT and Isolated power supply question

    Hello, This might be a daft one, but hell. I recently spoke with one of the qualified sparks on my site. He was installing an ISP (isolated power supply) cabinet for a bunch of circuits. As I never seen one of these before I became interrested and asked him about what it was and how it works...
  24. W

    Selectively question

    Hi I was just wondering an irons flex had been twisted until the line and cpc is visible there was said to be a bang and I can see it’s burnt between the two. my question is the 13amp fuse is fine but the rcd tripped and the mcbfor the circuit was down also. i understand there was a earth fault...
  25. P

    duplicate protective conductor question

    Is there a requirement stipulating a final circuit supplying only one socket outlet should incorporate a duplicate protective conductor?
  26. B

    Replacing switch on a domestic heater - DIY question

    Hi. I want to replace a faulty switch on a heater circuit but need some advice - photo of circuit attached. Heater has 2 simple on/off switches - one turns a 1Kw circuit of heaters on, the other a 1.5kw circuit of heaters on, both can be on separately or together to give a possible 3 levels of...
  27. S

    Smart meter question

    Is this a smart meter? Just bought a house with it already in, and I don’t want a smart meter! We’ve changed suppliers and have to provide them with readings so not really sure? Any advice appreciated
  28. D

    UK 3 Phase PME to domestic building?

    Good evening all.. I have recently installed a new 100amp 3 phase supply for a domestic premises with outhouses. The incoming 100 amp supply is PME and approx 30 metres from the main dwelling, a new metering cupboard was built for the new head and meter. I installed a small sub board and two...
  29. Bear

    A Question from the 2392/52

    Morning all, Am studying for my multiple choice questions next month, and my brain does not seem to get these type of questions? Want to now if am doing it right and understanding the theory correctly. The question below and then the way i got my answer. A radial socket outlet circuit is...
  30. J

    Outdoor TV antenna grounding question

    Ok Hello all and thanks for having me. I need some advice and joined this forum hoping to be pointed in the right direction. First off I am not an electrician and dont know the first thing about grounding or wiring. I will try to explain it the best I can. I recently moved to Middle Tennessee...
  31. M

    Cooker question

    I am rewiring a house I recently bought and have a couple of questions; I have a lead water pipe coming into the kitchen and it is not bonded back to the MET. The supply looks like an old 16mm2 cable. I take it a 10mm2 earth is sufficient. Is there any requirement to bond anything else in the...
  32. S

    UK Fitting an spd random question

    Morning all, I’m hoping someone could give me some advice on what’s the correct way or the done thing when fitting an spd. I’ll be fitting a new Hager 40 way consumer unit to my house following an extension and I’ve been out the loop a bit with the domestic side of things over the past few years...
  33. T

    PFC measurement question

    Hi folks, I'm carrying out an EICR on a 3-Ph board which cannot be isolated fully - only certain circuits at certain times. Supply protected by 3x 88-2 fuses. When carrying out PSCC/PFC, I'm getting a small spark at the probe on the neutral bar/MET intermittently. Can anyone explain this? The...
  34. S

    UK Spur in kitchen question

    Hi, I have a question about a kitchen spur. Currently fitting a kitchen for my brother, he is having a built in microwave in a wall unit and I took a spur from a double socket off the ring and ran it to a single socket in the wall behind the cupboard above the microwave. Now he tells me he also...
  35. C

    PV roof tile fixing question.

    I have a system to fit to a cement fiber slate roof. The problem is, the roof tiles have been fitted on 19mm battens (instead of 25mm) for some reason. To make matters worse, they've used over large galvanised nails. Any attempt to rip the nails out with a slate ripper tends to split the batten...
  36. M

    Hello everyone:) quick self introduction and question.

    Hi, I've come across this forum, started reading it and couldnt resist to not share my point of view and ask the question. About me: I was always interested in electricians trade. I've worked 3 years as an electricians mate in Poland, 3 years in France, then I come to UK. And I've...
  37. A

    3-Phase question - industrial unit

    Hi Hoping someone knowledgeable can give me an idiots guide to power for an industrial unit we are leasing. Please bear in mind I have close to zero electrical knowledge. We need 3-Phase power 400V connections for around 6 drilling systems we run on an intermittent basis, no more than 2...
  38. S

    PV Immersion heater question

    Hi I have fitted a PV Immersion heater to heat a single element in my tank when there is daylight. The installation seemed very simple and it appeared to generate some energy when I first fired it up, but a very small amount, since, it has not switched on the heater. The control box is...
  39. Z

    PFC test theory question

    Hi all! I'm at the start of a long road to become a sparky's mate, and I'm tryina wrap my head around something that might seem really basic. It's to do with the prospective fault current test. Let's say I get a reading of 1.2ka, and the main cutout fuse is BS 1361 type 1 which is 16.5ka. This...
  40. B

    solar pannel nickel-iron system question!?

    Ok, so I am a little stuck on one thing for a while now. For a nickel-iron battery bank of 24 volts, each cell is 1.2 volts and has a charging voltage of 1.65, so 33 volts is needed when for optimum charge. The 24 volt, 100Ah battery bank requires a optimal charge rate at c/4 (25 amps for a 100...
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