parallel

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  1. 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:
  2. 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...
  3. R

    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...
  4. S

    3 phase metering

    Hi, Can anyone suggest why these meters appear to be wired in series please? Thanks
  5. 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.
  6. 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...
    • bilbo_88
    • Thread
    • aus calculations electrical work out parallel resistance resistor working
    • Replies: 7
    • Forum: Australia
  7. 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
  8. 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...
  9. 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...
    • Rampage
    • Thread
    • aus cable cables circuit conductors parallel using
    • Replies: 16
    • Forum: Australia
  10. 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...
    • georgeo5664
    • Thread
    • aus circuit electrical work out parallel resistance total work
    • Replies: 23
    • Forum: Australia
  11. 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...
    • james7777777
    • Thread
    • aus downlights lighting lights parallel wiring
    • Replies: 21
    • Forum: Australia
  12. R

    conecting panels series parallel

    shello everyone, im starting a pv course tuesday and was wondering about a few things. the mounting of panels isnt much concern as im a roofer by trade the boss wants me on the course , there will be a electrician with us during the installs but i wanted to go on the course aswell as my boss...
  13. 4

    Parallel paths headache.

    Hi guys, I've spent the last few weeks reading through the site and have got to say I'm very impressed with the patience and knowledge you all have. This topic has been discussed and i'm sorry for bringing it up again but I would still like your opinion on the way I test and record my Zs...
  14. M

    parallel swa submain

    Hi I am considering the possibility of using 2 unused and existing 95mm 4core aluminium cables in parallel to feed a new submain distribution board I wondered if any one else has done similar and may be able to reassure me on the practical and/or technical implications the length of run is 130m...
    • mbelec
    • Thread
    • cables canada distribution length parallel submain swa
    • Replies: 2
    • Forum: Canada
  15. M

    Balanced strings in parallel

    I am designing a 2.3kw on roof pv sytem at the moment but am having trouble sizing an inverter, for 15 modules in 3 parallel strings, so the easy option is to go for 14 mods in 2 strings. The question is could the strings be imbalanced? ie 1 string of 8 and 1 string of 7 in parallel, thus...
  16. E

    two inverters connected separate or parallel

    I have two inverters wired to two strings. Do I need two separate wires from each inverter to an individual mcb. Or can I dual up the supply so only using 1 isolator at the generation meter end. I will still have 2 isolators in the loft adjacent each inverter. Or is it best practice to run 2...
  17. V

    total resistance of a parallel circuit

    Hi, Question- Why is the total resistance of a parallel circuit always lower than the lowest resistor? I feel i have read lots on parallel circuits and googled it many times but still cant figure it out. The four answers i have to use are: A=The current is the same across each resistor B=the...
  18. D

    Parallel Battery Discharging.

    Does anyone know the best way to discharge 2x12v batteries at an equal pace? We are currently using 2 diodes, one for each battery to help them discharge equally but the diodes see to get extremely hot and also sometimes dont seem to work too well. Is there anybody who knows of a better method...
  19. G

    Lighting circuit with PIR in parallel with Switch

    Hi, my landing does not get much natural light and was thinking of adding 2 PIRs and also keeping the current light switches. One PIR in the hallway on the groung floor and one on the landing, can anyone see any problems with this? Thanks
    • geezza
    • Thread
    • aus circuit lighting lighting circuit parallel pir switch
    • Replies: 8
    • Forum: Australia
  20. FatBob

    Using MCB's in parallel to give local isolation

    This installation has a very old DNO metal fuse box with a hinged lid, which may or may not open in one piece. The DNO's meter feeds 2 x 63A MCB's in a 2 slot CU. Can I feed a Henley block with both line connections from the 2x63A MCB's, thus using it as a local isolation switch? The...
    • FatBob
    • Thread
    • aus isolation local mcb's parallel trying using
    • Replies: 22
    • Forum: Australia

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