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parallel

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  1. 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
  2. F

    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...
  3. 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
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. G

    Parallel Supplies

    Is there amything wrong with having a parallel supply, that will consist of 2 different size cables? for examples say cable 1 = 25mm, cable 2 = 10mm. To give a 35mm
  9. D

    problems with Zs testing

    Hi! I was measuring Zs on a lighting circuit some time ago. First I did R1+R2 and it was around 1.60, pretty high but there were a few connections on the way and most of the cable was 1.0mm. Ze measured at the CU was low about 0.10 only, so Zs altogether around 1.70. When I measured it using...
  10. M

    Series and parallel

    Can someone just please clarify I have the correct understanding here. With a series circuit with two resistors in it the voltage from the source is dropped equally over the loads and reduced to mV on the outgoing side. Now if you tap into it before it hits those resistors you have created a...
  11. A

    Ring Final Circuit Problem

    Hi all hope you can help had a spur to fit on an old ring final circuit today that is made up of the old 3092 and old twin and earth were it has been extended in the past the readings i got end to end L 0.16 N 0.16 E 0.32 added together 0.16+0.32/4 = 0.12 but when i carried out a figure of 8 i...
  12. D Skelton

    Maths - Resistors in series and parallel: Beginner

    Maths - Resistors in series and parallel: Beginner
  13. D Skelton

    Maths - Resistors in series and parallel: Intermediate

    Maths - Resistors in series and parallel: Intermediate
  14. D Skelton

    Maths - Resistors in series and parallel: Advanced

    Maths - Resistors in series and parallel: Advanced
  15. H

    Cables in parallel

    A number of cables are tested for installation resistance. The highest individual value is 200M ohm and the lowest is 20Mohm. The measured value, when all cables are connected in parallel, will be? A. great than 200M B. 200M C. Less than 20M D. The sum of the individual values.
  16. J

    Parallel Feeds

    Doing an EICR on a building and a sub board has two 4mm twin and earths feeding it. Cables are connected into same breaker in main db but take different routes to get to sub board. Is there anything in the regs regarding as I cant find anything. Cheers for any information or advice.
  17. N

    Retractive switch for door entry

    Door entry system has a retractive switch marked press to exit. Can this be wired as a 2 way switch so door can be opened from 2 locations? Standard 2 way wiring? Thanks.
  18. K

    Please help me. i want to charge two batteries 12v7a+12v7a=12v14a parallel

    Please help me. i want to charge two batteries 12v7a+12v7a=12v14a parallel with PC power supply as i show you in picture on of my friend doing same like this...! but, i don't know how to do it this job. Please i require your help. Thank You so much all of you who help me. Please
  19. E

    2 way columbus press switch

    Evening all, I fitted 2 columbus press switches today to control 3 lights. I wired as it explained in the diagram and they worked fine. But I found that if you push the either of the switches to turn the lights on and press the other one whilst the lights are still on then it shuts the lights...
  20. P

    series & parallel

    I'm on second year of my 2330 at college on a night course but Im just wanting a bit of help understanding were these circuits would be used and why they would whats the benifits of either, I can do the calcs, I like to be able to visualise things in the real world not just be told about it in...

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