3 phase

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  1. udud22

    3 Phase Control Relay

    Hi, I am new to HV Electrical Stuff. I am trying to use a emergency stop button to kill power to BOX A remotely. The wall socket has 3 phase 380V supply without neutral. I want to introduce a control relay between BOX A and Wall socket. The remotely operated cable (20 metres) with Emergency...
  2. G

    3 phase sub meter running backwards

    Hi Have a client who has a 3 phase sub meter running backwards, Has anybody got any ideas how to resolve this please?
  3. S

    Workshop Q light gauge 220v can a 3 phase 415v connection be made up?

    Hello again and Happy NY all. I have decided to take a small piece of family land and erect a house ( live for a few years) As part of this, i have to do a lot myself, joinery carpentry etc. I have access to a rural farm workshop to conduct all, its dry but the electrical connection is run...
  4. T

    3 phase design process

    Hi folks, I'm installing a 3-ph 32A 60309 socket and just wanted to double check my design calcs are right... The circuit will be part of a 3-ph sub-board (200A main switch) supplied by our main 3-ph distribution board. The final circuit length is approx 30m. The sub board comprises just...
  5. T

    3 phase swa sub

    Just a quick one does a three phase 25mm sub main in swa 4 meters long have to be fused even thou it comes from a bs1361 100amp services fuse then from a standard three phase isolation switch fitted from electricity company? Being swa and 25mm in size would this be acceptable?
  6. J

    I'm considering having 3 phase installed

    Hi I currently have a 100A single phase supply ( forgive the pun ) & I am considering asking for 3 phases to be installed. I have some workshop equipment that I want to install which are 3 phase and total about 30kW. My property is fed by 2 cables overground on 7 telegraph type poles. My...
  7. B

    I have a motor supplied by 2 hot legs from 3 phase 480v. One line to motor is interrupted by a pressure switch.

    I have a motor supplied by 2 hot legs from 3 phase 480v. One line to motor is interrupted by a pressure switch. With one line to the motor hot at all times. Why does the motor not burn up?
    • Bassman
    • Thread
    • 3 phase legs motor phase pressure supplied switch
    • Replies: 14
    • Forum: USA
  8. D

    UK 3 Phase PME to domestic building?

    Good evening all.. I have recently installed a new 100amp 3 phase supply for a domestic premises with outhouses. The incoming 100 amp supply is PME and approx 30 metres from the main dwelling, a new metering cupboard was built for the new head and meter. I installed a small sub board and two...
    • deckie
    • Thread
    • 3 phase building domestic incoming installed new phase pme question supply
    • Replies: 4
    • Forum: UK Electrical Forum
  9. T

    Help me with inverter vfd to 3 phase motor

    Ac power supply 440V Inverter - Input 380-480V 50/60hz 11.2A Output 0-480V 8.5A 6.8kva 3.7Kw 3 phase motor- 2.2kW 50Hz Should i use delta or star connection? newguytoelectricity
  10. J

    Single Phase or 3 Phase

    I´m about to renovate a market stand into a snack bar and need to know if I´ll need Single-phase or 3 phase power supply. The stand is very small 11m2 and will have an electric 4 hob, extractor fan, a couple of small fridges, 1 small freezer, coffee machine, microwave and toaster plus lights...
  11. A

    3 phase socket

    Hi I have a 3 phase socket to change like for like does anyone know what tests have to be carried out after
  12. F

    how to wire a start button using a 3 phase contactor

    Hi Guys, any help is really appreciated! Want to wire a start button while using a three phase contactor. Contactor has A1 and A2 for coil and is 220 volts (contactor ). I tried wiring A1 to 1 on contact block and A2 to 2 on contact block of start push button. No power to machine. Does the...
  13. G

    3 phase shared supply

    Hi all, Im looking for advice about a 3 phase supply. I have such a supply on my property but 2 of those phases are used by adjoining properties that are not mine. Firstly is this "normal"? Secondly is it possible for an increased power load supply in this case? I have contacted northern power...
  14. M

    3 phase furnace

    Hi guys, we have a 3 phase 415V 36kw furnace. Just wanted to know the fuse needed for each phase. we put a 40A fuse for each phase and 1 phase just blew when started firing it up. I tried to calculate the right fuse and I come up with 65A per phase? Is that right?
  15. J

    3 phase supply

    Next month i will be working on a farm putting a new 3phase board in to supply welders, plasma cutters etc. 3 phase comes into electric shed (Tnc-s) and then supply into barn comes from 80A 3ph MCB with a 300 ma trip upfront. Supply enters barn and goes into an existing board with the earth path...
  16. D

    3 phase power

    I work in Broadcast television as a broadcast systems designer. I have seen in recent months a trend that is worrying (not sure if it is legal) that in a 19" rack there could be several phases wired to power distribution outlets (normally via IEC connectors) This means it is imperative that...
  17. Midwest

    Supply to 3 phase DB tripped

    As above, place I work at as maintenance, had supply tripped off at the weekend. Not some stuff I’m fully conversant with, so just seeking views here. 3 phase DB supplying power and lighting for rooms, using RCBO’s. Panel has this as main switch; The supply panel is this; From what I can...
  18. Pete999

    3 phase info for trainee electricians

  19. polo1

    BS number MK 3 phase main switch

    Anyone advise the BS number of this main switch...
  20. A

    3 Phase heating coil

    Hi. I'm making a 3 phase furnace with heating coils. Total power rating is 5 KW. I have to make one heating element for each phase. How do I split the KW rating? Will it be a straight 5/3? Also when calculating the resistance for each heater, should I calculate based on 220V(single phase voltage...

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