3 phase

  1. The apprentice

    Testing 3 phase (r1+r2)

    Hi there thanks for helping if you do, but was wondering on testing r1+r2 on a 3 phase distribution board could I link out L1,L2,L3 to earth and there for take all my reading that way ?
  2. E

    Any good resources/videos for 3 phase or industrial stuff?

    I've been watching Residual Current on youtube (great vids and great bloke btw) and really love watching the more industrial/commercial side of things. Are there any resources that teach how 3 phase works? Even college syllabuses seem to be very light on 3 phase stuff. How do people learn this...
  3. P

    Sizing and renting a 3 phase generator in Wales (in the UK)

    Hello everyone, I really hope this isn't an idiot question but boy, I'm out of my depth! I've spent about 3 weeks (not solid mind) trying to work out how to size a generator to power a lathe for a test. Situation is, I'm buying a house in Wales (UK) with a restored lathe in it. It's 3 phase...
  4. G

    3 Phase Advice

    Hi All I haven't done any 3 Phase work for some time but I have just been asked to wire up a new woodworking workshop. There will be 6 - 7, 3 pahse machines all ballanced load machines (4 pin plugs, 3 ph & e) 3 - 4 single phase machines, 2 x 32A ring socket cicuits and a couple of lighting...
  5. G

    New 3 phase supply

    I am in the middle of installing a new 3 phase system for a small bakery production area, new building, 200 KVA supply in total. 200 TP for workshop plus 4 separate 60 amp single phase supplies for new flats above new workshop building. Checking with UK Power Networks they inform me that the...
  6. F

    3 phase compressor DOL wiring

    Hello. I bought an old three phase compressor but it has come without a starter switch. Just five cables, two for the pressure switch and three for the three phases. I have a DOL starter switch, but I don't know how to wire it to make the compressor come on and off with the pressure switch...
  7. J

    3 Phase Socket in Refrigerated Area

    I have been asked to fit a 3 Phase 32 amp socket in a refrigerated area thats under construction. The cables will be on the walls and then a lining company is to come in and install 100mm thick panels 30mm from the wall all over to create a insulated box. inside the unit. The panel guys will...
  8. timhoward

    Practical question about 3 phase IR testing

    Regarding 3 phase IR tests for initial verification, I'm wondering how people actually do it efficiently. GN3 says to IR test between all phase permutations, then: L1+L2+L3 connected together to N L1+L2+L3 connected together to E N to E The OSG further comments that if the group test to earth...
  9. L

    Modification of 3 phase board

    Hello, wanting to install a new (old) MCCB in an Dorman Smith Loadline board, found a couple online, however, the client ordering the works is not keen on installing old breakers, so they would rather us connect tails onto the busbar stubs where the breaker would usually be, fashion some kind of...
  10. J

    UK 3 Phase RCD?

    I have recently started on a site where there is a 16A 3 phase Atex socket which is supplied by a 16A 3 phase MCB. It was picked up on a recent inspection that it needs an RCD. For the life of me I cannot find a 16A 3 phase RCD. I started to think does it really need an RCD? The socket is only...
  11. P

    3 phase supply cost

    Does anyone have an idea how much UKPN would charge for a 3 phase 100A supply. There is an overhead transformer less than 100m away from the property & the poles go right pass feeding the building next door.
  12. A

    Help with 3 phase pump wiring to sprinkler controller.

    Question on wiring? Sprinkler controller to 3 phase Goulds water pump. Sprinkler controller: "open sprinkler" uses 5vdc for master pump start circuit Goulds irrigator GT153 480v Eton contractor with 24Vdc control circuit and over load. Relay for sprinkler controller master pump on/off control...
  13. P

    Can I power 2 x 3kw immersion heaters from a single 3 phase contactor?

    Is it ok/advisable/legal to power 2 immersion heaters (both in the same cylinder) from a single 3-phase contactor? I need to connec
  14. C

    3 phase USA 3/60/220 to UK 3 phase is it doable thanks

    Hi 3 phase USA 3/60/220 to UK 3phase is it doable thanks oh and how?
  15. R

    New radial circuit to supply 2 double sockets on a 3 phase board

    So I'm back to work after the bank holiday and I've been asked to install a couple of sockets so they can plug this big beast of a ups system into it. Currently they have about 5 extension leads all linked to gather supplying it ? I've never worked on a three phase board before but I will...
  16. S

    Coffee machine wiring 3 phase on single phase circuit

    This coffee machine is three phase model number sm 105e It’s three phase with 3 brown cables one neutral and earth What is the cheapest way to wire it in? thanks
  17. S

    4.8kw electrical combi oven/steamer 3 phase

    In a small restaurant theres a single phase supply just wondering what size converter i would need to convert 3 phase to single phase and what size mcb to install into the ccu thanks
  18. G

    Roller Door Feed 3 phase (RCD?)

    HI all, changing a board in a commercial warehouse and they need a 16amp feed to a new roller door, there is an armored there that will do it and I'm fitting a new shnieder board with RCBO's, am i best fitting a 3 phase MCB in the board or a RCD commando by the door? Cheers Grand
  19. D

    Calculate 3 Phase MCB size

    Hi..I should probably know this but don't do too much 3 Phase stuff!! Can anyone give the formula for working out the size of a 3 phase MCB? I have a 12kw 3 Phase fryer to install. Cheers
  20. D

    3 consumer units off one 3 phase meter.

    Evening..Just wondering if it's acceptable to run 3 separate consumer units off one 3 phase meter, I have seen 3 consumer units off 3 meters on a 3 phase supply many times but never off 1 meter? Cheers
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