3 phase | Page 2

3 phase

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  1. T

    Lost Neutral on 3 Phase system - how do you calculate the effect on line voltage

    I know the effect of a lost neutral (floating neutral) on a 3 phase system, and the theory of why the line voltages can vary. However, I have been attempting to show this by calculating the line voltages of a phase system at given loads on each phase. Lets say:- Red 296 Amps, Yellow 279 Amps...
  2. S

    1ph to 3 phase inverter

    I have been asked if I can wire a motor for a car lifter in a domestic garage, however the motor is 3 phase and only single phase is available in the property. Is it possible to use a single phase to 3 phase inverter to power this motor? I will attach photos of the motor and its output.
  3. R

    3 phase heater & Economy 7 wiring diagram question

    I've a 3 phase storage heater currently wired to the main fuse box in an office I have. The heater has 2 supplies/isolators, 1 for charging at night and 1 for the fan (this is live 24 hrs a day). The charging supply only comes live at night due to a dedicated timer installed on that circuit for...
  4. will_505

    3 phase motor running backwards wire colours

    Hi all. Yesterday I wired in my 3 phase compressor to run off our 53kva generator. I just need to know which colour cable is for which phase as I'm not sure. Cables I've got are: brown, blue, black and green/yellow. I've currently got brown wired into live 1, blue into live 2, black into live 3...
  5. O

    Best 3 phase board and a question

    What are people fitting in the 3 phase range just lately, I've had a scan at various makes and it seems to be a ---- up between Hager and Wylex at the minute, both are / were decent makes and the RCBO's are reasonably price, things like Merlin are way too dear for the RCBO's. Also am I right in...
  6. puntloos

    3 phase, Automatic Transfer Switch for Solar/Generator - EPS

    For power outages, my solar inverter (+battery) is able to take on the entire house load - as long as I unplug my collection of vintage kettles. ;) - this is called EPS mode - Emergency Power Supply. Needs to carry grid (3 phase, 69A/phase) or solar inverter (3ph, only 7000W max) TL;DR: Can...
  7. S

    Single phase and 3 phase supply to same equipment

    I have a single phase stainless steel pasteuriser that has two control boxes attached to it. One box houses the control for the electronics and motor for the mixing paddle. The other box houses the supply to the water jacket immersion heater. The immersion heater is 1.5kw single phase and is...
  8. Shaun-

    3 Phase Metering Question

    Good morning, So I’m working on an existing 3 phase solar system and the customer wants a way to use the huge mass of exported solar on their pool. So currently looking at possibly using MyEnergi Eddi’s or something similar to power a 3 phase heater element (probably split into 3 single...
  9. H

    3 phase 400v supply to 2 phase supply

    Hi I have a question hoping I can get some help. I wanted to know if there is a 400V 3 phase supply (A/A/A) terminated on the primary side of a TMD breaker can you take 2 phases from the secondary side of the breaker (A/A) to create a 400V supply only excluding E/N and use to power up your...
  10. O

    Strange box attached to 3 phase meter

    I didn't get a picture so will have to wait until I go back again but I've done a crude drawing of what was there. Its in a commercial set up with a poly-phase meter, the distribution board and switchgear were all quite old but the meter looked fairly new, it was the usualll 3 phase in and 3...
  11. happysteve

    3 phase cooker - idiot check

    I'd appreciate a quick sanity check, thanks in advance: New circuit for a 3 phase cooker, in a community centre (run by a charity). Total load 16.5kW: L1 27A, L2 27A, L3 15A. (6kW oven, 6 hotplates: 3x 2kW, 3x 1.5kW). Commercial setting so no diversity: 3x 32A OCPD. (?) TN-C-S, so Zs...
  12. P

    3 phase 380V welder to run on a 3-phase 220V power

    I have an old Migatronic Automig X 200 welder configured as 380V 3-phase unit. Migatronic for spec. I have a 220V 3-phase point in my garage, but that does not work well, obviously. What would be the best option to get this welder to work? Would it be possible to rewire it so it can work on my...
  13. bigspark17

    3 phase surge on reenergising panel board

    Hi all.. Bit of a nightmare afternoon,, testing a caravan park TP&N panel board IR testing while board isolated before returning power (merlin gerin panel board) over the next 30 mins customers on park are reporting loud bangs inside some of there vans, boilers and electric fireplaces (with...
  14. D

    3 Phase requirements

    Hi all i have asked a electrician about the mic level i would need to power the following machines a 45kva cnc mill, a 32kva cnc mill and a 60 kva cnc lathe but have been unable to get an answer. I would like to get the 45kva mill and the 32kva mill sorted first it will be 6-12 months before i...
  15. R

    3 phase (220 volt) pizza oven to 1 phase (220)?

    How can I convert a 3-phase (220 volt 5.6 kw) pizza oven to 1-phase (220) 2 heating elements, no motor.
  16. D

    UK 3 phase sub board addition

    Hi Looking at a job currently adding a 3 phase solar installation but the distribution board is full obviously a new board is the best option but if the customer isn't interested in this what do people usually do? Add a small 3 phase board and use Henley blocks, I've never seen this done but I...
  17. will_505

    Will 4 pin phase converter work with a 4 pin 3 phase compressor

    Hi, leading on from my question the other day about running the 3 phase compressor off my 8.5kW generator I have since got my hands on a 240v to 3 phase converter. My question being the 3 phase output from the converter has only 4 wires/ seperatly cores coming out where as my compressor...
  18. O

    4 pole 3 phase breaker

    I have above mentioned breaker which does not have any markings to show which is the neutral pathway, I wish to fit it directly above a 3 phase 4 way surge protector which has its neutral on the right hand side and so would ideally want to connect the neutral above it on the right hand side of...
  19. 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 =...
  20. C

    3 phase shed feed in NSW

    Gday lads. Have a question about a 3 phase shed feed. I have a roll on 16mm2, 3 core and earth orange circular. Can I run a 16mm2 SDI neutral in the same conduit. And anything I need to comply with in SNWR. 3 phase Will be for shed and mainly to run welder

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