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  1. M

    Conductors in parallel

    "433.4 Overload protection of conductors in parallel Where a single protective device protects two or more conductors in parallel there shall be no branch circuits or devices for isolation or switching in the parallel conductors " I am in debate with another spark. I have installed 2x2.5mm...
  2. M

    How do i calculate missing resistance readings in a parallel circuit using R1 and Rt

    Hi I am a current student studying to become an electrician and a question has thrown me. I'm wondering if someone could help, there is a question on one of my home work books. "complete the following table assuming the resistors are connected in parallel?" the example I will give is R1 is 120...
  3. D

    UK Terminating parallel supply

    Need to use a pair of 6mm T&E in parallel to run an 10.8kW electric shower. Both same length and same route, will be joined to a single 10mm at the load end, and protected accordingly. Can anyone recommend a terminal box which I can use for this? I don't fancy putting a pair of 6mm into one...
  4. O

    USA Wiring Mishap - Wondering How Much I Destroyed…

    I'm a DIY kind of guy, and was never really fond of household 120V/240V power before, until I had a friend who used to be a journeyman help me understand enough to wire up my house we are completely renovating. So, after putting some walls and trusses in place, and running conduit all day...
  5. C

    LED Lighting

    Hi,Im just a fresher as design engineer. While browsing, I read that 330ohms resistor has to be placed parallel across an LED light, can someone tell me if it is necessary and why?
  6. V

    Series parallel motor starter with auto off proximity sensor

    Hi All A while ago a customer asked us to move a 1970s single phase corn mill and return it to use. It had an old series parallel starter with a lever on it ..which we replaced with a crompton controls series 3000 starter...all good and running. Now they had another ip rated box attached to...
  7. E

    Hooking two 120V hot lines in parallel?

    We are trying to use a 5000 watt generator to run a ULT cascade freezer in the event of a power outage utilizing an extension cord. The generator has two 5-20 duplex receptacles, rated at 2500 watts each, and one L14-30 receptacle rated at 5000 watts. The freezer runs at 120V/16A according to...
  8. C

    Parallel RCD Testing

    I've got to test a bunch of temporary electrical distribution boxes (see photo example) for an events company I work with. I've done this many times before and have no issue with the actual testing. However, normally I would do it on the bench with a non-RCD'd supply so as I can test and record...
  9. H

    Problem with contactors wired in parallel

    OK I've got 2 contactors where the coils are wired in parallel. They are sitting right next to each other, One pulls in and holds perfectly well. The other pulls in and drops out. Pulls in again drops out. Ect. Ect. For as long as you are trying to keep the contacts closed. I've tried...
  10. J

    Zs and parallel paths...

    Hi all, easy question I’m sure, so hope someone can clear up for me. If there are parallel paths on a circuit upon which Zs is being measured, will the parallel path cause the Zs to go up or down, and could someone explain why this would be so at all? I just need a clear understanding of this...
  11. P

    LED Strip RGBW - How to split for parallel wiring?

    I'm looking to install some LED lighting strips to light some display shelving. It will consist of one driver going to a controller which will then be split into 8 x 1m length strips. I was wondering if anyone can give me an idea on how to split the power from the controller to each strip i.e...
  12. C

    PIR parallel to Switch makes short circuit

    Hi, I have lighting in the bathroom plus an extractor fan. There is one switch for the lights and one switch higher up for the fan. I installed a PIR in the bathroom and wnated it to turn both lighting and the fan in parallel to the switch. I fed the PIR from the fan's permanent F and took the...
  13. J

    Domestic 24v Garden fence lights - series or parallel??

    Hi everyone, I was wondering if I could get a little advice on a small project I plan to carry out over the next few weeks. I plan to install 10x 6w GU10 LED bulbs (fitted inside some suitable outdoor light boxes) on each fence post along a 30 metre garden fence, the lights will be powered...
  14. C

    Parallel generator, earthing and bonding

    Hello, can anyone advise on bonding of extraneous conductive parts when supply is from a generator run parallel with distribution network? There'll b a 200kva generator supplying spray booths that have a gas supply to them. The metal pipes aren't underground but connect to tanks outside sitting...
  15. R

    Rheostats in parallel. Load sharing??

    Hi all. Hyperthetical scenario. Simple loop. 36V supply. 10 amps. So whatever resistor I place in the circuit to produce the 10 amps has to be capable of taking 360W. If I only have access to 200W capacity rheostats can I use two of them in parallell to share the load? Thanks
  16. D

    Parallel paths on R1 + R2 test

    Hi there Doing some testing at moment. R1 + R2 readings coming in lower than R1 + Rn. Cpc neutral and live all disconnected. There is alot of containment on job and adaptable boxes are all fly leaded to earth. My thoughts are they are parallel earth paths but guy working with seems to think...
  17. jonnyb

    PIR manufacturers parallel etc etc etc

    Anyone currently able to tell me which pir sensors are able to be wired in parallel and which aren't ( usual factors and suppliers) as I need to have two controlling one light and don't want to have to return them and get alternatives.
  18. R

    Wiring series parallel battery bank ?

    Just checking if this is correct wiring for series parallel on four 6 v batteries to get 12 v output. I have maximum of 30 amps of solar going in, what size cable is right for the battery bank connections ?
  19. Gavin John Hyde

    Parallel earth path between 2 circuits

    I have a ring circuit (circuit 1) and a light circuit (circuit2) in a flat im working on and i have somewhere in the walls or ceiling a joined earth path. From what i have seen there is no obvious metal conduit, so it seems its either the ventilation system that is fed by the same ring and goes...
  20. kingeri

    Conductors in parallel......

    I was at a job on Friday in a big 4 storey house. One of the jobs I was there to do was to add sockets to a bedroom which actually didn't have any at all. The top floor sockets were on there own breaker, a 32A RCBO actually. There were two 4mm^2 T&Es at the RCBO so I initially thought it was...
  21. D

    wiring led household bulbs - parallel of series

    Hi, looking for some advice. I'm doing a DIY project for a vanity mirror, with bulbs along the top of it. Each bulb is 7w. I've got some 5 port wago connectors, and have wired it with the live, neutral and earth from the plug connecting into individual Wagos. Then each bulb holder has a wire...
  22. M

    Connect 25 AA batteries in parallel and series

    Hello, I have 25 batteries that are AA using 1.5 volts each, that is total = 37. 5 volts for 25 batteries. I want to know please the right way to wire all the batteries together to make a parallel and series battery pack. Please tell how to wire each battery together to connect all 25 AA...
  23. B

    Cables In Parallel, Max Load?

    Hi Just wondering if someone could help me out with this one Basically I'd like to know what's the maximum load (single phase) a 4 core 6mm SWA could deliver if cores were connected in parallel SWA in buried under ground and the length is three hundred meters The cable used to supply a 3...
  24. T

    Led lights wired in parallel, should be series. How to resolve?

    Hi Have little issue Some Led lights have been wired incorrectly, instead of series the connection, it's connected in parallel. The supplied transformer/driver is 350ma constant and connected in series the lights are pulling 3v each. There are 9 lights in total and are set and can not be...
  25. S

    3 pirs in series

    Hi guys advice needed i am on a job where there are going to be 3 pirs controlling around 12 lights the 3 pirs are just because of the layout of the room,these have to be wired through greggs this is a method I have never used before as have been doing heavy industry for past few years can...
  26. O

    Paralleling conductors

    Just bouncing something off people here.. Got a job on, customer currently has a single phase 230v 16Amp commando socket he wants changed for a 32A ( Seemingly has a few machines in mind with a larger than 16A draw but below the full 32 that he's considering buying in...hasn't decided which yet...
  27. uksparks

    Charging Leisure Batteries in Parallel

    Hi, This is a question for anyone who can help with DC etc and Leisure Batteries. I have a 500w load at 12v, made up of. 75w car stereo which includes 15w per Chanel, and 425w of LED lights. I have 5x 100Ah Leisure Batteries all connected in Parallel, total of approx 500Ah. My load is 500w...
  28. M

    2394/2395 Question

    Question is : - The insulation resistance of two circuits is of 40M? an 36? respectively. When tested together what is the total insulation resistance: answer is 19 ohms but how? can some one explain
  29. D

    Domestic Shower Cable

    With shower say 10mm is dam hard to move, would 2x6mm or 6mm+2x2.5mm as being more manageable Still the same cross sectional area
  30. G

    Electronic time lag switch

    Hi all. Got another query regarding time lag switches. One of my lads has fitted some led lights which are switched from multiple points via time lag type. Normal switches were in use before and all worked ok. Now the time lag switches are in place all lights are on constantly. (They work with...
  31. M

    TT systems parallel earth paths

    Good Morning Gentleman i have recently been testing house all of which are overhead supplies fed and the bog standard earth rod installation however we had some serious earth path issues with a39 ohm earth rod when combined with the bonding taking it down to 0.27 ohms almost tncs then the...
  32. A

    series and parallel combinations

    Hi all I am carrying out my assignment and a little stuck on this i have to work out the Total inductance and total capacitance now I'm aware of the formulas for series and parallel inductors and capacitors but as you can see from the picture i have a series/parallel combination and I'm...
  33. C

    parallel conductors and neutral switching of through contactors in lighting circuits

    Hi guys, I have come across two problems today well acutely three so I will list them first.. 1st Testing a 4mm radial circuit today or so I thought! I asked the young lad to go to the end of line and take an r1+r2 reading. When he opened up the last point he said that there were four 2.5...
  34. B

    Parallel circuit

    Hi, I am training to be an electrician. I am stuck on a question and wandering if someone could help me please the question is; two heating elements of 700 ohms and 300 ohms are connected in parallel. The total resistance of this circuit would be? Now I think I might be looking into this too...
  35. S

    Indicators in parallel with contactor coils

    Am I right in thinking it is bad practice to wire indicators in parallel with contactor coils? If so, why? Thanks
  36. A

    LED lighting strips

    I am looking at producing a production light for filming using natural white light led strips. I will be using 3 5m reels rated at 12v and 2A/5m. I am looking at using 100cm length (therefore there will be 15 100cm lengths) and was wondering whether it is best to have them in series or parallel...
  37. B

    Metal conduit

    Am I correct in saying that you cannot accurately measure R1+R2 on a ring main where the metal conduit is used a cpc. Would R2 be the best method
  38. B

    LED downlight connection

    Hi all. Noob forum member here. Can I ask what is considered to be the correct method/s of connecting the tails from several LED downlights to the driver. Specifically I have just found a constant current LED driver in a cupboard of my new house. It supplies power to 8 x 1W downlights in the...
  39. R

    push to break switch

    Hi all. Does any one know where I can get a double push to break switch for a cupboard with 2 doors? Basically so it works if either door is opened.
  40. sjhall

    360 PIR 2way

    Alright Chaps, I've a long corridor in an office block that I'm fitting some 360 PIR sensors to the lighting, I need the lights to come on all at once for all locations of the corridor but there is a blind spot so I'll need to fit 2 sensors... Is there a sensor out there that you can link...
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