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parallel

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  1. 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...
  2. 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
  3. 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...
  4. 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...
  5. 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
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. rustynails

    SOLVED: 2392 Question Parallel Insulation Resistance

    The insulation resistance of two circuits is of 40M and 36M respectively. When tested together what would be approximately the total insulation resistance: A: 1440M B: 76M C: 19M D: 4M I don't know the answer, so how do you figure this out? :rolleyes2:
  11. N

    Cables in parallel

    Hi all, brilliant forum and loads of useful and interesting information. An example question wrt cables in parallel: If you happened across an installation with a 10mm earth cable and wanted to uprate it to 16mm; what is to stop you placing another 10mm in parallel, all marked up with 'safety...
  12. ringer

    Continuity of ring final circuit conductors

    Why is it when you cross connect the conductors at each leg and then test continuity, the result is one quarter of the combined resistances of the legs? I am usually pretty good at seeing how/why calculations work out, but just cannot in this case get my head around why the value measured is a...
  13. S

    3 phase metering

    Hi, Can anyone suggest why these meters appear to be wired in series please? Thanks
  14. I

    Battery bank question

    Hi there, my local solar installer tells me that I should not have more than 3 strings connected in parallel for my 24v battery bank.... is this correct? what could be the problem if I have series of 2 batteries x 6 strings in parallel? thanks.
  15. B

    Working out resistor calculations...

    Late at night....tearing my hair out....need help with working out resistor calcs. 230V supply....R1=70...R2=90 What is the value of a resistor which when connected in parallel with 70 ohm resistor will cause a total current of 2.4 amps to flow in the circuit? any guidence to push me in the...
  16. T

    2 feeder cables in parallel VD calc

    anyone able to help with this? I understand mVxInxLofRxtemp/1000 but it's surly not applicable so what calc is to be used? thanks
  17. J

    Help please - 2 parallel South South East facing roofs

    Semi ignorant member of the public here looking for advice from an expert not trying to sell to me. I am in NE Scotland. Looking to purchase 16 X 250 W panels but too tight for space on largest SSE facing roof. I have 2 parallel SSE facing roofs about 8 feet apart. The smalIer roof will have...
  18. R

    Parallel Conductors.

    Going slightly off piste on my D&V Project again. I'm thinking of running parallel conductors for an electric gate supply 'just to learn about it'. After reading the BGB it seems quite simple, in that the sum of two smaller cables will be the Iz of the circuit as long as the cables are roughly...
  19. G

    how to work out total resistance of a parallel circuit

    hi i am new to learning about electrics i have just started an electricians course and have a question. The question is : Two heating elements of 70 ohms & 30 ohms are connected in parallel the total resistance of this circuit would be...... i have tryed all differnt web sites i have worked it...
  20. J

    Wiring in downlights - do they have to be in parallel??

    Hi I have 9 downlights to wire up. They are positioned around an exisiting celing rose lamp at the centre. They are double earthed so I assume I dont need an earth for them. next question is can i wire them up as below where 0 is the downlights and the rest is 1mm cable. The red downlight is...

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