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parallel

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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
  8. 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...
  9. 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.
  10. 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 ?
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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
  21. 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
  22. 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...
  23. 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...
  24. 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...
  25. 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...
  26. 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...
  27. 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
  28. 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...
  29. 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
  30. 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...
  31. 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.
  32. 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...
  33. M

    Parallel cables

    Hi I was give this calculation to do! First have I done it right? And is this the same as calculating parallel circuits? In a 230V DB 7 different circuit give out an installation resistance test of 200, 200, 150,100,50, 25 and 2. I came up with RT= r1+r2+r3+r4+r5+r6+r7 RT = 1/200 + 1/200 +...
  34. M

    Parallel cables

    Help with calculation please. If separate cable measure : 10Ω, 5Ω, 5Ω, 4Ω and 2Ω what would it be in parallel? I get this so far 1 1 1 1 1 1 = What happens next? 10 + 5 + 5 + 5 + 4 + 2
  35. F

    Domestic Parallel wiring Fluorescent tubes basics.

    Hi all, I'm trying to build a wall of 6ft fluorescent tubes, creating an effect similar to this: http://herbertfoundation.org/media/img/xl/159_436rm.jpg I'm looking for a way of achieving this effect, spending as little as possible as I can't afford fabrication. I've been considering buying...
  36. M

    Resistors In Series-Parallel

    Me again folks After Sintra helping me out yesterday i've stumbled across another problem. I've attached the problem if anyone can help or guide me in the right direction i'll know how to work these out in the future. Thanks in advance folks. Mark
  37. M

    Resistors in Parallel Help

    Hi All first post. I'm currently doing a Pre Entry in Electrical Engineering and really enjoying it so far. My question is i'm finding the Resistors in Parallel a bit tricky see below. The question asks me to determine the values of V,I2,I3 and R Suppose i'm more confused in whats best to...
  38. S

    paralleling fuse boards

    First time post although avid reader. And first post is a question, sorry! What are people's thoughts about paralleling fuse boards. Been asked to install a new board by linking off the existing boards supply as the current board is full. They are lug and bolt terminals so can easily double the...
  39. E

    Dedicated 32a2.5mm rfc for underfloor heating

    Hello all, doing rewire at the moment and i have pit underfloor heating on dedicated ring to save cable. No reason why not right? Conductors in parallel and all that. Not using fcu's just using stat as DP isolator. 7 zones/stats. Design current ok with Ref method B. Am I doing the right...
  40. S

    Doorbell problem

    Hi, Any idea's, 1 doorbell, 4 chimes, 2 transformers, 1 of the chimes works from 1 transformer (now not working) & the other 3 works off another transformer. So one of the chimes have stopped working. I checked the voltage on the secondary side of transformer & this was o.k & voltage at the...
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