voltage drop

  1. W

    Voltage Drop Calculation vs OSG

    Hi All, Hoping to get opinions on Vd calculations for a 1.5mm2 downstairs lighting circuit with an estimated length of 128m! Length is due to loops at switches (neutrals required) and switched lives feeding various strings of lights. Parameters: Mv/A/m - 29 ib - 2.38 L - 128 Method 1...
  2. S

    exceeding voltage drop

    hey guys we have done an EICR on a 2 bedroom bungalow, the supply is a 25mm 4 core 3 phase SWA to the property, it is supplied from 80amp fuse. although it is speculative as the cable is underground we reckon the distance is around 600m :fearscream:. it has being installed around 10 years and no...
  3. S

    Do the voltage drop and fluctuation occur?

    Hello, We have a mini split AC Inverter. We need electrical wire for the second mini split AC inverter. Can we get a wire branch from the first AC terminal? Do the voltage drop/sag and fluctuation occur?
  4. AngelLaHash

    Random Voltage Drop from 236v to 120v

    BIG place OK lots of electrical bits. but one on a 3 phase Radial is tripping its RCCB so i check the wiring making sure its tight and it has continuity even trust the RCCB that it trips. All ok but i noticed on phase for a short while it dropped to 120v on my meter.. just Random comes and...
  5. H

    Voltage drop help please

    all currently working towards my 2391 c&g I&T . I know how to calculate v.d. but the mock test I found online seems a bit out of date or I'm potentially doing something wrong. Here comes de Q. Voltage drop of a single-phase distribution circuit supplying a power distribution board in a remote...
  6. D

    Measuring Voltage Drop - With or without Load?

    I am sending power to some 5v led lights about 50ft from the transformer. I was going to use some CAT6 direct Burial cable that I kept after a contractor accidently cut it (I replaced the wire as I did not want to do an underground splice). So I plan to use 1.5 pairs (three conductors) for Pos...
  7. B

    3 phase voltage drop calculation?

    Hi! Once you've calculated the voltage drop in Volts - you divide by 400V for three phase right? For example: three phase 30kW appliance, 10mm 90 degree SWA, 45 meter run. 30,000/sqrt3/400 = 43.3A = Ib from the table 4E4B, a 10mm cable gives 4.7 So then 43.3 x 4.7 x the 45 meter run gives =...
  8. B

    Single and three phase current capacity and voltage drop differences.

    Hi All, From what I understand, working out the design current - Ib for single phase is quite easy (max appliance power/voltage). For three phase, do I take the max power, divide by 3 then divide by 230 to get the Ib? (We definitely use 230V for everything right?) Now for voltage drop, We...
  9. M

    Voltage drop sin phi

    Hi chaps, Been working though the electrical design guide and I'm stumped on reactive power. volt drop and the equations are easy enough but I have no idea where sin phi has come from or how they have calculated it at 0.6. Any help would be greatly appreciated
  10. P

    voltage drop running 50 amps 350 feet from service pole.

    hello. i need to run power to a cabin that is 350 feet from the service pole in our driveway. the problem is voltage drop. the service pole is 150 feet from the transformer so total run is 500 feet. is it possible for a diy'er to purchase a small transformer that would bring the voltage up? (i...
  11. Y

    12V voltage drop dual battery camper installation

    Hi there I can't wrap my head around a problem I have when trying to connect my dual 12v battery system in a camper. When I plugged in my VSR ( Orion from the brand Victron) i measured the + input was 3 volts although engine running (and app saying 14v input...). I thought the wire were too...
  12. Daniel DD

    Surge Arrester Installation and External Short Circuit Protection Device

    BACKGROUND I live in a small town where it is difficult to find ceritified electricians. In fact, electrician certification is not common for residential installations. I did find some experienced electricians but I don't think they are certified and know best practices in the installation. I...
    • Daniel DD
    • Thread
    • circuit circuit protection device external installation protection short short circuit surge surge protection voltage drop
    • Replies: 1
    • Forum: DIY Electrical Advice
  13. M

    Circuit length and voltage drop

    Hi, I'm currently doing my assignment for 2357 and was just making sure I'm calculating the cable length for the lighting circuits right. As depending which way you do it, it alters the voltage drop a bit. On the drawings I've looped in and out at the switches all the way to the final light...
  14. G

    complex voltage drop question

    The project: Install 12VDC 3 Watt Low voltage LED pathway lights, one every 20', along a 420' boardwalk through a mangrove forest. There are 24 lights and to minimize taps in the main line they will be installed in groups of 3 with one light at the tap, one light 20 feet behind and one 20 feet...
  15. E

    DC Wiring help

    Im looking for some advice on some dc wiring i have in place. Currently i have some monitoring equipment that wont run when connected to a run of wire about 40m long (1.5mm diameter) it is connected to a 12v 100ah battery and what i think is happening is the voltage drop over that distance is...
  16. P

    Excessive voltage drop, HELP

    So, I have encountered strange problem. Thing is when I connect load with power about 30w my voltage goes from 227v to 170v it is single phase system. Wires are brand new and thick enough. Is it maybe a problem in power company transformer voltage stabilizer or something else. Im also curious if...
  17. P

    Voltage Drop at an RV Park

    First, I really appreciate any feedback you can provide. Its awesome to have a group of people that have a passion for this! Our RV Park has a transformer dropping service down into three 200-amp meters (single-phase 240V service X 3). From each of these three meters, we have an emergency...
  18. N

    Voltage drop calc

    can anyone tell me if this is a correct way of thinking i have 6 Cleaners outlets off a !6a rcd, total run length is 55m 6mm feed to first point is 30m would give me voltage drop of .78% (using half the breaker load according to exception 1 on page 163 of as 3000:2018) then run a 2.5mm for...
  19. J

    Voltage drop on rgb LED strip

    Hi! I’ve installed an rgb strip light to a friends house with a dropped ceiling and I did expect some voltage drop but not as bad as it is, the problem I have is 1. I have ran 2X 2 core 0.75mm2 cable from the carcass unit where all the sockets and less driver is in, into the wall and comes up...
  20. D

    need to solve voltage drop over long run

    Ok so at some point I'm going to need to run another leg, until then. I have a main panel, 230v 80ft run to a we'll & pump, then a 900 ft run up to water tank and a pressure pump with another panel. Then a 120v leg off that that I want to plug an RV to. All 10 gauge 30 amps. With such a long run...
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