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volt drop

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  1. J

    Volt drop and load

    Hi. I am new to the forum and most of my experience is in 12/24v systems. I have a bit of a basic question really and was hoping to clear it up. If I had one PSU with an output voltage of exactly 12 volts and 4 loads of 1 amp each and a 5th load of 2 amps all ran in 1 mm cable and each cable run...
  2. S

    Volt drop question

    Hi guys could do with a little advise on a rather large job re-wiring lamp posts in a car park. The supply will need to cover a distance of around 120M from mains to sub board where floods are already wired in 2.5mm SWA on 2 circuits the furthest travelling another 123M the other travelling...
  3. M

    mixed 1.5 and 2.5 mm lighting - volt drop calcs

    ok.. so any help appreciated..i want to add some Klik lighting management boxes to the end of a circuit to control 10 lights. The circuit up to the ceiling rose I wish to utilise to feed my first klik is wired in conduit using 2.5mm cable. I want to add a two way lighting switch to control the...
  4. jackhammerJIM

    volt drop calcs and 230 v

    why do we have to do the calcs to 230v when the supply never is 230v measured voltage at source is 248 volts at the site i am on at the moment , can somebody shed some logic on the idea before i start engineering an 18 volt drop into my cable sizes ( a joke of course but why not ? ) :ihih:
  5. G

    volt drop on elv LED wiring

    Hi. I'm new to LED wiring and am wondering how to work out volt drop when using 24 volt drivers and 2mm elv cable. The length of run is about 20 metres. I've read that the 4% stays the same as 230v but what would be the maximum length of cable that could be used?
  6. P

    Volt drop calculation

    Hi, Thanks in advance for any advice! I was called out to a client’s swimming pool, as there was a fault on the pool lights. I found that someone had installed 2 x 12 volt 300 watt lamps, recessed underwater into the pool walls, using 10mm cable in parallel so that there are 2 neutrals and 2...
  7. A

    all this rubbish about "volt drop"

    the little boys on here worry about a bit of volt drop a few volts it happens all over the world children what the heck wrong with with a bit of volt drop? things still work thats all that counts
  8. M

    New Zealand Volt drop cont.

    Ok I have another VD question. I'm installing 9 LED floods around my friends garden which totals at just over 100m in length. Obviously for each branch the VD varies so for argument sake I worked It out as if all the cable would be taking all the load (rather than dropping relevant current after...
  9. E

    Volt Drop

    Hi all, Just wanting to clarify regarding volt drop. Client is looking to add lighting to garden, to be supplied from 13a FCU, load on FCU will be less than 1A due to LED lighting. The FCU will be an addition to a final ring circuit which serves dining room and lounge, protected by 32A MCB...
  10. M

    Over current vs volt drop.

    I'm having another one of my crazy thought processes that I'd like help clearing up please. This example is completely hyperthetical so please give some consideration for that. If for example a circuit was designed very badly and a length of 1.5mm t+e was used for supplying a 8kw shower and the...
  11. M

    Volt drop for entire installations

    It states that you are allowed a permissible volt drop of 3% for lighting circuits and 5% for power circuits in domestic use. Now is the limits for the entire electrical installation? I was under the impression that it was per circuit. For example 3% of every lighting circuit and 5% for every...
  12. M

    Volt drop from radial spurred from ring main.

    I'm installing a gate supply at the end of a customers garden. My plan is to spur off internal ring main and run a radial roughly 100m to end of garden. Providing the long run cable is of adequate size to sustain 230v to the end of the garden am I right in thinking that I can tee off again at...
  13. S

    Volt drop cable calculator

    Hi guys I was having trouble working out volt drop. Type in google (Doncaster cable calculator) only a guide not exact but though it may help!
  14. T

    volt drop

    How do u calculate the design current on circuit.?My old Qs always used to just put the mcb rating into the equation... And he once made us wire a 6mm radial for some sockets because it was a long run and he took the design current as 32 a?? It's too difficult to even get the conductors in the...
  15. Jackflash

    volt drop outbuilding supply

    Hi, Looking to supply power to two outbuilding/sheds to be used as offices (no electric heating required). one is 60m from supply source and another is 10m further on. I'm currently debating what size supply / cable to install taking volt drop into account. Ideally in unit 1 i'd have...
  16. A

    whats with all this volt drop crap?

    posters on here often worry about volt drop, whats the prob with a few less volts @ the other end of the cable? will a few volts less end in disaster? will the suppy cable catch fire? be nice i,m mellowed out at the moment:mickey:
  17. Jackflash

    volt drop outbuilding

    Hi, Looking to supply power to two outbuilding sheds to be used as an office (no electric heating required). one is 60m from supply source and another is 10m further on. I'm currently debating what size supply / cable to install taking volt drop into account. Ideally in unit 1 i'd have -16a...
  18. C

    Volt drop on wind turbines?

    Is there a noticeable volt drop on the output of wind turbines that would prevent them being situated too far from a dwelling? Reason I ask is that my my parents declined a wind turbine ( to part supply a 3 bed detached house) as they were told that it would have to be located adjacent to the...
  19. J

    little help with volt drop calc

    Hi everyone just a little confused,when calculating volt drop using table 4Ab do you measure the voltage of the installation and use that value to calculate or do you just use the 230 volt value
  20. C

    12V Volt Drop

    Hello, I seem to be getting a bit confused here and wonder if anyone out there could give me a bit of help. I am wiring a new build in North London. The Architect is also the client and he is putting some pretty funky and complex kit in the build. The house has large shutter over the windows...

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