3 phase

  1. A

    3 phase socket

    Hi I have a 3 phase socket to change like for like does anyone know what tests have to be carried out after
  2. F

    how to wire a start button using a 3 phase contactor

    Hi Guys, any help is really appreciated! Want to wire a start button while using a three phase contactor. Contactor has A1 and A2 for coil and is 220 volts (contactor ). I tried wiring A1 to 1 on contact block and A2 to 2 on contact block of start push button. No power to machine. Does the...
    • freddiemac
    • Thread
    • 3 phase button contactor how to phase start using wire
    • Replies: 18
    • Forum: Talk Electrician Forum
  3. G

    3 phase shared supply

    Hi all, Im looking for advice about a 3 phase supply. I have such a supply on my property but 2 of those phases are used by adjoining properties that are not mine. Firstly is this "normal"? Secondly is it possible for an increased power load supply in this case? I have contacted northern power...
  4. M

    3 phase furnace

    Hi guys, we have a 3 phase 415V 36kw furnace. Just wanted to know the fuse needed for each phase. we put a 40A fuse for each phase and 1 phase just blew when started firing it up. I tried to calculate the right fuse and I come up with 65A per phase? Is that right?
  5. J

    3 phase supply

    Next month i will be working on a farm putting a new 3phase board in to supply welders, plasma cutters etc. 3 phase comes into electric shed (Tnc-s) and then supply into barn comes from 80A 3ph MCB with a 300 ma trip upfront. Supply enters barn and goes into an existing board with the earth path...
  6. D

    3 phase power

    I work in Broadcast television as a broadcast systems designer. I have seen in recent months a trend that is worrying (not sure if it is legal) that in a 19" rack there could be several phases wired to power distribution outlets (normally via IEC connectors) This means it is imperative that...
  7. Midwest

    Supply to 3 phase DB tripped

    As above, place I work at as maintenance, had supply tripped off at the weekend. Not some stuff I’m fully conversant with, so just seeking views here. 3 phase DB supplying power and lighting for rooms, using RCBO’s. Panel has this as main switch; The supply panel is this; From what I can...
  8. Pete999

    3 phase info for trainee electricians

  9. polo1

    BS number MK 3 phase main switch

    Anyone advise the BS number of this main switch...
  10. A

    3 Phase heating coil

    Hi. I'm making a 3 phase furnace with heating coils. Total power rating is 5 KW. I have to make one heating element for each phase. How do I split the KW rating? Will it be a straight 5/3? Also when calculating the resistance for each heater, should I calculate based on 220V(single phase voltage...
  11. G

    Single phase circuit on 3 phase system calc

    Hi, I have a query about calculating current in a 3 phase system. So a 22kw load in 3 phase assuming a power factor of 0.8 would be 22000/(1.732x400x0.8) = 39.69A and say a 7.2kw load on a single phase supply would be 31.30A if you simply use ohms law. But what happens when you calculate the...
  12. S

    Sleeving 3 phase cable to single phase cable

    Could someone help me understand what is cable sleeving? Can we sleeve a 3 phase cable to single phase cable? Is this as per any regs? BS 7671? Could you send me some pictures of the same if you have..
  13. V

    consumption meter for 3 phase

    hi does anyone know if there is a product please that i can use to meter a 3 phase supply (not current drawn at the time, but one which will continue to add up the current used on each phase). I am after one which will just simply clamp onto the tails rather than hard wire one in. Even if i get...
  14. S

    Electrical test on 3 phase control panel

    Hi i need some advise on writing out a electrical cert for a control panel,i have only tested distribution boards has anyone done certs for control panels?. My query is the panel has overloads for motors,ive done my R1 R2 tests etc how do i record these on the schedule as there not circuit 1-12...
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