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volt drop

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  1. G

    2365 Level 3 Design Project. Volt Drop feed to Summer House and earthing

    Afternoon Gents, just a query regarding volt drop and extending the equipotential zone on a PME in the level 3 design project. In my design I used a 16mm armoured and the associated volt drop was 5v, this left 1.9 volts for the lighting ring in the summer house. Tutor said not to worry about...
  2. T

    Calculating volt drop

    When doing volt drop calcs, should you use the rating of the mcb/rcbo for the design current or the realistic current the circuit is going to use? Just doing a calc for 40m or 4.0mm 3core swa feeding 6 sockets. Im going to wire them in a radial via b32 rcbo
  3. T

    volt drop percentages

    Please can someone give me the correct percentages for volt drop please
  4. T

    Volt drop in the real world

    Has anyone ever had a volt drop issue? Just for fun.......... yes i said fun, i cant believe i would be saying that in my mid 20s But i did a calc for a radial circuit in in swa B32 mcb 4.0mm 3core swa 35m run (mV/A/m) So...... 11X32X30/1000 = 10.56 Way over the 5% in table 4Ab Am i...
  5. EricMark

    Volt drop, does it matter?

    There are two items where volt drop can have a large impact, magnetic ballast fluorescent lamps, and refrigeration units, there are some other odd items like shrink rap machines, but most items today use switch mode power supplies so volt drop would need to be rather large before it becomes a...
  6. The apprentice

    max volt drop to sub board

    max volt drop to sub board 3 core swa 137 meters ?
  7. G

    Volt drop Question SWA

    Hello All, I’ve been asked to install a cable 170m in SWA, this is to be pulled through ducting. The cable is straight from the meter to an isolator in a beach hut. As the property is so small with little electrical appliances, I have accounted for 45A max current and deduced a 35mm2 SWA. Is...
  8. drzsta

    Volt drop..................................................

    hi all, I have a situation where I would need to supply a 40kW installation from a Generator situated 300 meters away (not ideal). As this is a private LV supply up to 8% VD is permissible as per App. 4 Sect 6.4 in the BYB. However it then goes on to state that final circuits should not exceed...
  9. Steve93

    Formulae help please!cable size and volt drop

    Got to that time my boss wants me to ‘prove myself’. We have a job coming up and it’s a solar there’s a 40kw inverter that is 3 phase. He wants to know what cable size will it need to be and how much current per phase? Am I right in thinking it is power/voltage? 40kw/415=96.3A? Will that be the...
  10. M

    volt drop questions 20 characters

    A recent post made reference to the vd figures for a lightly loaded cable could be adjusted to reflect the fact that the cable was running nowhere near it's maximum ccc. Is there any basis for this in 7671? I think it may have been Ian 1981 who posted this in reply to a question. If it is known...
  11. Jamie'

    Calculating volt drop finding ib

    I'm an apprentice and I was going through my college work to do with volt drop and everything I needed to know about the design current was in the question. What I'm confused about is in the real world how you would know this? Am I right in thinking for arguments sake if I'm supplying an out...
  12. Andy

    Large Volt Drop in ring circuit

    Hi Folks This is my first post, but I've been reading many posts over the last few months and have found this forum very informative and some times very humorous, Thank you all. I have recently come across a problem whilst doing some PAT testing for a customer that has left me confused...
  13. Pete999

    Pete's Videos Volt drop prank a classic

  14. Midwest

    Supply to Summerhouse - volt drop

    I've been asked to quote for a supply to a 'Summer House', clients words not mine. Due to the lay out of the property, it's not practical to supply direct from the CU. There is a socket on a RFC, that can provide a supply via FCU. Although their garden is quite small, the route for the swa will...
  15. snipersmith87

    LED volt drop- maximum LEDS on 6amp??

    First post all so go easy lads.... What's people's views on maximum amount of LEDS on a 6amp mcb lighting circuits?? 6w LED GU10s throughout. Wired in 1mm twin and earth. Maximum cable runs??? Nearly every spark I speak to has a different verdict. Should we still be considering if 50w halogens...
  16. J

    flats supply volt drop

    afternoon chaps estimating for a job for a communal area and 3 flats (3stories) only been emailed the drawings by the contractor so far so no site visit yet -assume there is a 3ph supply was thinking to have 1x single phase DB local to the income- to cover the communal lighting and small...
  17. S

    Volt Drop table help

    Hi, I was calculating volt drop today using xlpe armoured cable, 3 core, single phase. Table 4E4A pg 373. I am using 3 core cable but on single phase, so i would assume column 3 for single phase. I was told by the tech helpline although the cable is being used for single phase that column 4...
  18. HappyHippyDad

    Honest Views On Volt Drop?

    I have just been asked to provide power to a large garage/workshop for a friend. The workshop is approx 55m away from the main CU and there will be a further run of approx 15m for the lights from sub board to end point of lighting circuit. It will be on a 32A MCB in the main CU. measured voltage...
  19. juice

    do you use the multipliers from tab 13 in OSG when calulating volt drop?

    I've recently done a C&G 2396 Electrical Design Course and unfortunately the tutor who taught the course did so for the first time and in my opinion didn't do a good job of teaching the material. I'm now doing my revision for an exam this Thursday and trying to make sure all the formula I use...
  20. soms

    Volt drop calculations - a couple of questions

    Hi, I currently am working on some cable sizing calculations for an exercise in which we apply our knowledge and use of the OSG. We have a ficticious single-phase, light commercial installation for which we have designed the circuits to supply a range of requirements and loads. We have selected...

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