three phase

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  1. C

    Three phase - serial connection

    I have two FCU's in the same room. Can these two FCU's (3 phase) be fed from same cable from the panel located in the another room? Is it acceptable as per codes? or do I need to run separate cables?
  2. S

    Three Phase Power Supplies

    Hi I'm new to the forum & currently still learning the trade, would someone please be able to clear this up for me as I keep getting conflicting information, my understanding of three phase power supplies is, if you have a standard system in place say TPN supply & 3 x main cut out's, fused at...
    • Spark2019
    • Thread
    • phase power supplies three three phase
    • Replies: 6
    • Forum: The Welcome Forum
  3. A

    Noob Three Phase Help

    Hi Everyone, I'm hoping someone might be able to help answer a question which i have long pondered over. Firstly i am not an electrician, please dont hold it against me, i'm just interested to seek answers when there is something i dont quite understand. I work in the event production...
  4. Paul Williamson

    Old and New three phase board wiring

    Hi All Can I get some advise please. Is it OK to install a new lighting DB with all new lighting circuits wired in all new colours, Brown, Blue and Green/Yellow, all the other boards are in the older colours. Black, Red and Green/Yellow. The question is, the DB is a 3PH & N and the tails have...
  5. S

    For Sale Single Phase & (some) Three Phase Boards & Devices

    Afternoon all, I've had another clear out. I thought I'd offer it up to you guys before I whack it on eBay. I'm ideally looking for an offer on the lot, however i'm happy to take offers to suit what you need. Here's what's available: 1 x Single phase 11 way consumer unit 100 amp incomer -...
  6. Amnesh Singh

    Connections of a Three phase Motor STAR and DELTA.

    Amnesh Singh submitted a new resource: Connections of a Three phase Motor STAR and DELTA. - THREE PHASE 400/600 Volt AC Motor STAR and DELTA Connection DIAGRAM Read more about this resource...
  7. J

    Electrician Jobs Three Phase Rotary Converter Install with Sockets

    Not a 'commercial' job as such but given that three phase is involved I feel it belongs in this section. In my semi-professional cabinet making workshop I have a 32A consumer unit. For a range of three phase machinery I have acquired a Transwave Rotary Converter (RT4) which requires a 25A...
  8. R

    Lower the voltage of a three phase 220v delta wiring system with auto transformers

    Hi all, I have a three phase 220v delta wiring system but the real voltage is about 240-245V by measuring between the pairs RS, RT, TS. I want to lower it to about 220V so I was thinking to use three auto-transformers 240-220V wired like this: I expect to find 220V between the transformer...
  9. Michael J

    Three Phase overhead supply is it TN C

    While carrying out a EICR I found on first inspection that there were no RCDs installed . When I checked at the Pole Mounted Transformer the Earth & Neutral were connected at the Neutral point. So am I right in concluding it's a TN-C System? The 17th Edition states that RCDs should not be...
  10. G

    Rear entry three phase board

    Hi, Is it OK to create a rear entry in an eight way three phase BD. A technician friend of mine says he has never seen this done before?
  11. polo1

    Three phase sub metering advice

    Hi all, been asked to install sub meters in an office building which is being sub divided and let out as smaller units. The owner/landlord intends to recover power costs fro tenants in each unit. Haven’t been to site yet, but understand the following: - Each smaller unit has its own sub board (...
  12. L

    63A three phase socket

    Good morning, We have a load of approximately 18.5kw ( compressor skid). There is a plan to install a dedicated socket for this machine, the cable route is yet to be finalised and One of the contractors says 16mm2 cable 100A fuse is adequate but this comes from a rule of thumb as opposed to...
  13. D

    Amtech/trimble single phase three phase headache?

    Amtech will not let me record a single phase D.B from a 3 phase D.B for a sub-mains. It keeps saying in a warning message that the installation is 3 phase and it cannot be recorded as single phase even though it will let me record single phase D.B's individually on the board schedules...
  14. L

    Three phase socket query

    Hi, We have a three phase 400v socket rated at 63A. It is proposed to use this for a mobile skid. There is an 18.5kw motor and an approximate estimate of current is 34A, the supplier is saying that the socket is not rated high enough as the skid has dual redundancy ( two 18.5kw motors) and as...
  15. D

    Single to three phase converters

    Has anyone had any experience of using these?? Any good?? Got a customer who wants to put a 3 phase 11kw chicken rotisserie into a shop with only a single phase consumer unit and doesn't want to spend 10 grand on getting a new supply.
  16. R

    How to carry out PEFC and PSCC on a three phase db with a rcd as the supply?

    Ive got my am2 resit tommorow for my live testing and I ran out of time and failed as well as I carried out the ze test on 2 lead high thus tripping the rcd. So now I know for next time to complete this on a 3 lead LOW test and measure ze with earth disconnected etc.. then connect main earth...
    • RyanF
    • Thread
    • carry out pefc phase pscc rcd supply three three phase
    • Replies: 9
    • Forum: UK Electrical Forum
  17. C

    Calculating three phase power usage.

    I’ve been asked to calculate power usage of a machine to works out how much it costs to run. Current draw is: L1: 9.71 L2: 9.61 L3: 11.14 N: 7.78 Obviously when designing a circuit you would base it in the highest phase ampage. But is power usage worked out the same way? Or are three...
  18. L

    Single Phase Load Estimate to Three Phase Power Supply

    Hi Everyone I would be glad if you could clarify this for me: For a Load Estimate Survey whereby 95% is single phase, the Load Estimate is 90 KVA (Single Phase). However, the power supply is three phase 4 wire system. To calculate the current per phase, the 90 kVA is divided by three i.e. 30...
  19. G

    Single Phase Charger on Three Phase Supply

    Hi all, been a bit of a lurker of the forums here for a while and so far they have saved me more times than I can say, but now I have a question that I am hoping you can help me with. I have a single phase forklift charger and it currently has a 2p+e plug and connects to the corresponding...
  20. J

    Domestic three phase? advice

    Hi I have recently moved into a small newly renovated (inc electrics) cottage and noticed appliances going really slow. Kettle taking an age to boil, toaster taking a long time, hair clippers going slow... you get the picture. UK power networks sent an engineer that changed the overhead power...

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