three phase

  1. D

    Three phase circuit breaker - Utilising only one phase

    I have a scenario where there is a three phase DB in a commercial property where there are mixture of three phase and single phase washing machines. All the washing machines including those that are single phase have triple pole MCBs installed and wired in 5-core to 16A rotary isolator. from...
  2. A

    G100 Export Limitation - Multiple Single Phase Arrays - Three Phase Net / Vector Metering Limitation

    Hi I have three phase installed recently to increase generation. DNO approved the extra 2 solar arrays so we have 3.68KW FIT on one phase and 8KW on phase 2 with 6KW on phase 3 We are coming to the end of the install and my question is as the DNO have limited export to zero how do we share the...
  3. A

    Australia Three phase cable to wire single phase

    Can I use three phase cable to wire single phase
  4. Confusedsoconfused

    £7,000 electricity Standing Charges

    Hello, We are converting a former office into 10 self-contained flats with kitchens, showers, heaters all electric, no gas. We have been offered a three-phase connection from the National Grid, for 180 kVA, an LV Cut Out and CT Panel. We then approached EDF (large business team) for a supplier...
  5. R

    What diversity factor to be applied to a three phase food holding unit?

    Hi there currently doing some diversity calcs for college work and had a query about what diversity factor to apply to a 16A 3 phase commercial food holding unit. I'm thinking that this equipment will be only used in the day time(breakfast, Lunch and Tea (what we call the evening meal- dinner...
  6. Pastory

    WHY ISNT THERE A NEUTRAL WIRE IN THREE PHASE

    Why the main three phase doesnt have a neutral wire before reaching a stepdown transformer, how does electricity form a loop back to its source
  7. J

    UK Three phase dust extraction auto start

    Hello, I am currently working with 2 separate circuits, one for the dust extraction and another for a circular saw. Both circuits have an isolator with 3 phase and neutral then each goes off to its own dol starter. I was wondering if there is a way to make them both turn on at the same time...
  8. Confusedsoconfused

    Converting into 12 flats, KVA, phases etc. Help!

    Hello, I'm new to this forum, we are in the process of converting into 12 flats all electric, no gas incl. heating, showers etc. An electrician was hired to apply to the National Grid on our behalf for a three-phase connection. He then quoted us £1,800 plus VAT for civil works i.e. to dig...
  9. J

    Single or three phase? Whats popped?

    (Thought I'd already poost this Q, but I cant see it, so I'll try again) We have some work going on in one of our buildings atm. On of the chaps has drilled into a cable that was buried in a wall in a fairly random location, knocking out the power to one of the flats (and giving him a nasty...
  10. W

    What type of circuit breaker would be used for a three phase circuit?

    Hi , Currently doing a design project in college and I need to pick a circuit breaker ( In device rating and type) for a food holding equipment unit that requires a 16A 400V three phase and neutral supply that is supplied by 5 core SWA. I think I should pick a 16A 3P+N RCBO but wasn't completely...
  11. GeoffatMM

    Three Phase Cable Sizing

    I am an enthusiastic retired engineer rebuilding a barn in France from scratch and am having problems sizing my incoming electrical cables. I have had answers from 4mm to 50mm cross section from various pages on the internet so you can understand I am a bit confused. There are two main cables...
  12. H

    Testing PFC on a three phase board with 100 amp From the meters tails

    I’m currently doing some testing on some site temps I have a three phase trip system the tails from the head go into a 100 amp RCD which feeds a board I’m trying to do a pfc on the db but it comes up with 2 lead high which trips the RCD I tried on 2 lead low however came up with 20 amps which...
  13. E

    Three phase rcd protection

    Hi guys, I am rewiring a commercial launderette with 3 phase machinery. Does the machinery need to be RCD protected being in commando sockets. The sockets are not accessible to the public and each circuit is being used for a specific machine. With the price of three phase rcbos the...
  14. I

    Three phase equipment RCD protection on a TT system

    TT system, existing three phase fuse board recently installed by another spark which only has single phase circuits terminated into individual RCBOs Required to install three phase circuits for new equipment, is there a better way of doing this than fitting a 4pole RCD ahead of the main switch...
  15. jimbobbrad

    UK Old Three phase UPS wasting electricity?

    I'm hoping someone can sanity check or correct my thinking. I have a very old UPS, it's showing a power factor on the front display of 0.1 We put a clamp meter on the 3 incomers which all read 36 Amps. the 3 outgoing legs are showing 12, 6 and 4 Amps That's 108 Amps in and 22 Amps out, I'm...
  16. Z

    Three phase motor (two speed switch)

    Hi, I am trying to wire a two speed switch to a three phase motor. I have continuity checked the switch in both positions 1 - Low and 2 -High (See attached) Can someone confirm if this is correct and would this change the speed. Secondly i have a cable coming from what is I assume from the delta...
  17. Khanzada

    Load calculations on three phase board

    Costumer have 12 flats and need to feed for each flat a prepaid meter and consumer unit within the flat , the main supply to building is three phase , my question is how to distribute the load for 12 flats, each flat have a load of 63A. Main supply is three phase .
  18. Z

    Wiring diagram for 3 phase contactor start up

    Hi all, I have two three phase sanding machines that both have there own contactor start up. Both work fine. I have connected a dust extractor to them both. That also has its own contactor start up ad works fine. Its also 3 phase. How can I wire the the extractor to be triggered by either...
  19. M-B-Electrical-Services

    UK Client wants a battery back up

    Hi all, I have a regular client who has asked for a battery back up system to be installed at their home. They live in a rural location on a single phase PME supply with a 100A fuse and run a business (internet based) from there too. They suffer from regular power cuts which affect the day to...
  20. B

    220 volt, three phase element

    I have a 3 phase element for a steam generator but the element is a 220 volt element. the diagram is in Chinese which i cant read. on the diagram it shows three phase delta connection for 380v and three phase star connection for 220 volt with a neutral connected to the star point. My question is...

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