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  1. D

    Three Phase Flex - two black cores?

    Hi chaps, Spent today repairing a load of 63A and 125A three phase flexes. When taking the damaged plugs off I was somewhat surprised to find that two of the cores were the same colour... Can anyone explain why I've got two black cores and one brown? I was expecting to find black, brown and...
  2. shakerbess

    un-balanced three phase system

    hi i was hoping to get some help with a question please. why does the current flow in the neutral when the three phase system is un-balanced? is it to do with the fact when you have an unbalance between the phases the difference of current between the phases that causes excess current will...
  3. E

    Three Phase Load Calculations

    Evening Chaps, I need some assistance with regard to a three phase load calculation. Back story here is im fitting a new supply cable for an industrial three phase oven and need to know what the max load will be per phase to ensure adequatley sized cable is is fitted. The cable run will be 80...
  4. J

    three phase switch fuse location

    I am after some advice/help. Im currently on a new build home which has a new 3 phase supply put in by uk power networks. The consumer unit is well in excess of 3 meters away from the meter but the problem I have is that it is an external meter box and I cant put the switch fuse back to back...
  5. K

    Pls advice . 3x 2kw single phase 220v heater element to 6 kw three phase

    Hi to all So this is the question I have heater system in my basement, it has 3x heater elements all rated 6kw, so i have 3x6kw. Each of them is connected through kontaktor with three phases and neutral wire, so correct me if im wrong, each heater element works 3x2kw 220v right? That means every...
  6. I

    6 x 1 bed flats two Three Phase supplies?

    Hi Guys, I'm currently tendering on two separate projects which are two blocks of 6x 1 bed flats I am fully redesigning due to all of them eventually being sold separately sold and metered ill give you an overview of the two projects and my thoughts of the distribution aspects any thoughts in...
  7. B

    Three phase motor mcbs and rating

    Hi all a bit confused and need some advice on what size of mcbs I require for wiring a three phase motor just wanted to get some some info on it. So if I have a three phase induction motor with full load current at say 30amps on the nameplate at voltage 415volts. What size of breaker will I...
  8. R

    three phase supply Maximum demand and Diversity Quick questiion

    Hello All, Just wondered if you have time to answer a quick question. For maximum demand on a three phase final circuit i.e A 20 A TP-N supply. Do I have to allow 20 Amps for each phase without further calculation.
  9. B

    Setting thermal overloads three phase direct on line motor

    Hi all can anyone give me there thoughts on setting of thermal overloads. I have heard all types such as set them at 110% of FLA. Set them 125% of FLA. Set them at 100% of FLA. Get running current and set them 10% above this. But I have heard a lot set them at 110% to avoid nuse tripping...
  10. W

    Three phase in to UK 3 pin plug

    Hi all Hoping someone might be able to give me steer.. I have purchased a commercial convection oven with a three phase plug. I'd like to switch the plug out to a regular household UK 3 pin plug. Is this possible and how would I go about it? Cheers! :grin:
  11. T

    three phase industrial washing machine off ship

    Customer has two industrial washing machines three phase he wants to install in hotel faceplate indicates three phase 60hz supply needed. Says they came off a ship. Would our 50 hz supply work they are roughly 16 and 18 kamps each.
  12. B

    Inrush currents for a three phase induction motor

    Hi all, was wondering if anyone could help me with this. I have had a three phase induction motor rated at 85.8amps full load and voltage is 480volts connected in delta. My question is that when I was first starting up the motor it kept on tripping the main switch due to the inrush currents. The...
  13. S

    3 phase metering

    Evening Gents, I have been tasked at work to install a 3 phase meter measuring power usage in a commercial kitchen area.My question is - Is there are a product out there which can be permanently clamped around a three phase cable which provides a digital display and will...
  14. B

    Setting overloads for three phase motors

    Hi just a question on setting the thermal overloads of a three phase motor. I have heard a few electricians state a few things regarding what it should be set at 1. Get operational current of motor and set it just above that reading 2. Set it at full load current of the motor 3.set it at 110% of...
  15. A

    Smoke alarm problem - AICO Ei141

    Hi, Our house has three of these alarms, interlinked so if one goes off then it sets the others off a couple of seconds later. For reasons I needn't go into I had one of them disconnected last night by removing the main unit from the base plate, and removing its battery. Also the lighting...
  16. markythesparky

    three phase extension lead

    Guys What cable would you guys use to make up a three phase extension lead for use with a jet washer? I was thinking SY cable but I can't earth the sheath in commando sockets. Someone suggested a heavy duty rubber type flex. What do you think? The supply would be 32a per phase.
  17. T

    3 phase immersion

    here's one for all you time served electricians out there.......we have a client who has a three phase immersion heater installed in to a bulk tank 1000 litres! that has never been wired up, as he only has a single phase supply, he want us to fit an immerSUN to dump the excess power from his 4kw...

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