parallel

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  1. 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...
  2. D

    Battery 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...
  3. 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
    • circuit lighting lighting circuit parallel pir switch
    • Replies: 8
    • Forum: Australia
  4. F

    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
    • isolation local mcb's parallel trying using
    • Replies: 22
    • Forum: Australia
  5. D

    Zs testing

    Hi I have just tested the Zs on my ring final circuit... i got the readings 0.25, 0.32, 0.47 and 0.52 there are more but the readings were basically between 0.25 and 0.52 Ze is 0.11 and r1+r2 is 0.35 i get the same readings either at the front or the back of the socket so with the test...
  6. D

    Battery batterys in series

    hi every one just a quick one if i connect 2 x 12v battery's in series to get a 24v supply what happens to the Ah of my batteries? thanks in advance Mike
  7. J

    method of finding R1+ R2 of circuit

    Why is Zs-Ze not a approved method of determing the R1/R2 of a circuit
  8. D

    RCD's in parallel

    Hi, Working at a house (TT system) and a new build office/garage is to be built. House has split load RCD board. 1. Should i use 1 of the spare ways and feed the office with a sub-main. or 2. Use henley blocks and take the supply from meter tails. Option 1, will mean if the house trips then...
    • dmc
    • Thread
    • parallel rcd rcd's
    • Replies: 17
    • Forum: Australia
  9. A

    excessive earth loop impedance on final circuit

    Hi. This seems like a newbie question but please help. Received the test results with an 'excessive earth loop impedance' on one final circuit. Circuit originates with a 32A MCB and serves 10 socket points. Wiring is 2x2.5mm live, 2x2.5mm cpc. Max Zs = 0.72 Ohm. r1 (line) = 1.68, rn (neutral) =...
    • AmeliePoulain
    • Thread
    • circuit connections earth final impedance loop loop impedance measured neutral parallel
    • Replies: 8
    • Forum: Australia
  10. J

    Pros & Cons of Wiring in Series & Parallel?

    Anyone care to take a stab at it?
  11. Jay Sparks

    Cables in parallel formula

    Hi Guys Quick one for you. A cable that is 25M long and has a resistance of 2.3 m ohms/M ( milli ohms per metre ). A second Identical cable is to installed in parallel with this conductor. What is the total resistance of the two conductors connected in parallel? 1st conductor: 25 x 2.3 =...
  12. R

    Final Circuit conductor sizes in OSG 8.2

    Referring to pages 158-159 in the OSG Table 8A Type, OPD(A) A1 Ring, 30 or 32 .......etc 8.2.3 Conductor size ....The as-installed current-carrying capacity Iz so calculated must not be less than: 20 A for ring circuit A1 Am I reading/interpreting this correctly when I say...
  13. N

    Help Please with Parallel connection affect on Resistance!

    Hi i have this question that i am not sure of the answer. Can you please Help? State the effect on measured resistance when cables are connected in parallel. Answer: The resistance value will be reduced. For example in resistance for Zs testing in ohms has a measured value that is...
  14. A

    Parallel feeder cable Question

    Hello All. Not been on here for a while, hoping you guys can help me with this one. We installed 185mm single copper core aluminium armoureds (2*185mm per line conductor each run 170m) to an MCC feeder. The intend was to use the aluminium armourings as the main CPC. My question is, how can i...
  15. G

    Pir sensors for flood lights, parallel wiring 2 sensors to one load

    Hi all, Is it possible to wire two PIR sensors in parallel in order to give two beams of coverage with just one flood light as the load. Have you done it? I am concerned that if one sensor activates, 230v would get onto the output of the other without the other having been activated. I have...
    • greeny
    • Thread
    • flood lighting lights load parallel pir sensors wiring
    • Replies: 5
    • Forum: Australia
  16. S

    Power Supply?- Installing 12v Dowlights (MR16) in Parallel

    Just a quick one to get a feel for what other sparks are doing when installing 12v downlights into kitchens etc (in existing properties, not newbuild). I have a customer who wants me to install their new (9x) downlights at the cheapest price (no suprise) so as this has an impact on the amount of...
    • shocksmith222
    • Thread
    • 12v installing lighting lights mr16 parallel power power supply supply
    • Replies: 4
    • Forum: Australia
  17. C

    Series and parallel

    Hi there, let's say I have two 24V DC powered appliances, and I would parallel them up and use a 24V DC power supply to power the appliances. However, what would happen if I series them up and use a 48V DC power supply instead? Both appliances are resistive load and has the same power...
  18. A

    help required!wiring motion sensors in parallel to lighting circuit?

    I am trying to wire some motion sensors in parallel at each end of a corridor at work.There are 6 lights that are connected to this circuit via small plugs. I have got one sensor which work's by connecting it to feed at IN terminal and connecting OUT terminal to closest light. Doing this makes...
  19. D

    Particulars of the installation at origin?

    I'm about to start some work on a detached garage. Sockets lights etc etc. From the supply head there is a 63A switch fuse, that takes a set of 25mm tails to the board which is situated about 4m away. From the board it goes in 16mm 3c SWA to the garage where it is terminated into a four way...
  20. C

    Temporary Paralleling of Transformer for Changing Over Supply

    I have two 415V busbars separated by a bus section which is normally open. Busbar 1 and busbar 2 are normally fed separately by transformer 1 and transformer 2 respectively. Both transformer's HV side are from the same 11kV board. Both transformers are of the same manufacturer, model, ratio, tap...
    • calvint
    • Thread
    • before canada changing fault parallel problem supply temporary transformer transformers
    • Replies: 4
    • Forum: Electrician Talk | All Countries

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