three phase

three phase

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  1. M

    UK Three phase supply into single phase board

    Hi I popped round to quote for ‘ finishing ‘ a solar install started by a company rhyming with Bird of Polar . The house has a three phase supply, but it looks like someone has taken the three live tails into board not designed for three phase (albeit with a three pole switch). They’ve only...
  2. F

    Single phase spur from Three phase isolator.

    Morning all, Little advice regarding whether spuring from a Three phase isolator to a single phase FCU is allowed? I need to wire a Single phase FCU which is located right next to a 16A TP isolator to a high speed door. Obviously, It would be a lot less pain to wire straight from the TP...
  3. bugraekuklu

    Switching between phases depending on live health

    Hello, I'm pretty new to the forum. Hopefully, this is the best place to post it somehow. Currently, I have a setup of a distribution box, which is able to supply 63A three-phase load to an EV charger, running two-phase load of 16A. It demands 3.7kW from each phase, making it a 7.4kW charger...
  4. Brownie91

    Is SPD mandatory for a new circuit?

    Hi all I am after some advice on an installation I have coming up. Its a new TP+N circuit in SWA (13m run clipped direct) for a 22kW Tesla wall charger. I will be installing a Matt:e unit upstream to provide regs compliant RCD protection & Open Pen protection. My main question is do I need...
  5. 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...
  6. 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...
  7. A

    Three phase cable to wire single phase

    Can I use three phase cable to wire single phase
  8. 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...
  9. 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...
  10. 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
  11. 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...
  12. 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...
  13. T

    Mounting height for residential three phase dis board

    Hi everyone, this ones a first for me but weve been asked install and use a three phase supply in a large new build house. The 16 way dis board is going to go in a ground floor store / plant room and will give us either 48 single phase ways or a few less if we use some three phase 22kw EV's...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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