parallel

  1. 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...
  2. 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
  3. 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...
  4. 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...
  5. 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...
  6. 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.
  7. 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.
  8. 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.
  9. 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
  10. 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...
  11. 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...
  12. S

    Mains Disconnected and parallel connected generation switchgear

    Hi, I am new so I need to get some posts going. I am not a registered spark I am more of a technical contracts engineer. I am looking at if it possible to have a generator which backs up the mains supply (auto change over) but also is connected in parallel so can export to the grid. I am not...
  13. S

    R1 and R2 parallel earth

    hi guys and girls, any ideas on why when cunducting an R1 and R2 and also polarity when it was a closed circuit i had 1.87 ohms but when opened circuit 238ohms. this was on a lighting circuit pme system all correctly main bonded and zs complied. thanks
  14. K

    solar cable

    Hi I am building a solar system and need advice on what cable to buy, I bought 6mm2 cable and found the inner wire was only 3mm. I have 4 12volt 80w 5amp panels to be wired in parallel, 2 110amp battery to be wired in parallel. The cable length between panel and batteries is 12m, I have...
  15. P

    MCB sizing for parallel cables

    Addition to old installation - routing through trunking to supply a sub-board with two 6mm SY cables. However, I can't find any info on sizing of MCB to maximum Zs for parallel cables - -? Seems to me the problem could be using calculated Zs for the two in parallel as in the event of a fault...
  16. S

    Relux software on Mac via Parallel sofware!

    Hi guys, been using Relux on my mac via parallel. It works fine until i compile the design data and then the charts show up messed up and non visible! Is anyone else having these issues?? Thanks
  17. S

    Fitting immersion controller in parallel with timer ?

    I recently bought one of these to switch on our immersion automatically when we generate enough solar power ... Water Heating with Surplus Solar PV - Solar Unfortunately, our electrician has failed to show up 3 times to fit it. So I'm thinking of having a stab at it myself as I have some basic...
  18. N

    Question regarding Continuity of Ring Final circuit.

    Can we carry out the continuity test for the ring final by connecting the line, neutral, and cpc end to end at any socket or do we have to identify and disconnect the conductors at the C/U? I am aksing as i think it is much easier to link the line, neutral, and cpc end to end at any socket...
  19. W

    Two parallel RCDs flick off at the same time - earth capacitance - any pointers?

    I need to rectify a fault where an outside SPA hot tub is supplied through a length of 3 or 4 meters of buried armoured (shielded) cable and – when the MCB is closed – after 10 seconds the 30mA type A RCD above this MCB opens – and so does another in parallel with this on a separate UK style CU...
  20. H

    Series and Parallel

    Hi everyone, first of all great site with some real great answers on here. I have a question which might sound silly but can't get my head around it. Series and parallel. Can anyone give me a practical real world example of the two? I've got my 2391 next month and I really don't understand what...

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