phases

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  1. N

    Can we connect the 2 phases lines ( 110 V each ) to RCD breaker?

    Can we connect the 2 phases lines (110 V each) to RCD breaker? please advise ?
  2. M

    Hey guys, what does for example 300A rating on a 3 pole MCB means?

    Hey guys, what does for example 300A rating on a 3 pole MCB means? Does it mean each phase carries 300A i.e. (Current in R=300A, Y=300A, B=300A) or it represents total currents in all the 3 phases i.e.(Current in R+Y+B=300A)? Please assist, it is confusing me a lot with my calculations of...
  3. C

    Dual phase Solar install with Battery - Getting batteries to cross phases.

    Ok so I am an electrician but don't really do solar, my partners sister has a holiday let complex, due to her energy bills rising to £36k a year they are going to get a solar and battery storage system installed... They generally close over the winter so the load during the winter will be just...
  4. J

    2 out of 3 phases installed the wrong way round!

    Hello. I hope someone can help. I've just discovered that on a new build house built just over a year ago there is a problem with the wiring from the incoming mains fuses to the consumer unit. Phase 1 was wired correctly. But the cable from Phase 2 on the main fuse is connected to Phase 3 on the...
  5. J

    UK WHY? - When connecting 2 phases in 3p, we get 400v

    When we use 1 phase, L1 or L2 or L3 - we get 240V When we use 2 phases, L1 & L2, or L1 & L3, or L2 & L3 - we get 400v. When we use 3 phases, L1 & L2 & L3 - we get 240v?
  6. A

    I did a VLF and IR test on my 33kv cable and IR resulted between 80 to 100Mega Ohms

    I did a VLF and IR test on my 33kv cable and IR resulted between 80 to 100Mega Ohms on all the phases and VLF between 0.270 to 0.470mA is the cable ok
  7. mattg4321

    A storage heater on 2 phases.

    Just looked at a job and the storage heater has a peak and off peak supply to it. These are on different phases. There is a label on it to warn of this. Not something I’ve seen before though and feels wrong but probably almost inevitable in commercial buildings with storage heaters. Thoughts.
  8. timhoward

    13A sockets different phases

    Hi On Friday I found 2 x 13A double sockets about 30 cm apart in an office. One of them was on same circuit as all other sockets in same room. The 2nd one had been added, and drilled through from the adjacent office. The circuits are on different phases. Common sense dictates that a 400v...
  9. M

    Convert 3 phase into 3 single phases

    Hi there, I have currently started working on a farm and they are having a new 100a 3 phase supply installed. This is being terminated in an external enclosure. They then want to carry this 3 phase 150 meters to a barn and at this point split it into 3 single phase supplies. Is this even...
  10. L

    There is a one circuit (one voltage source), two phases and

    Hello Electricians, This is my first post and I'm glad to be one of this forum member. However, to clarify my question. I've a "Skin Effect Heating System", fed by 1240 V. The circuit is quit simple, Phase U, Neutral in the middle and Phase V. Phase U and Neutral feeding the heating cable#1...
  11. Mark42

    What colour panel lamps to indicate phases?

    I’m making breakout (‘Distro’) boxes to distribute power from three phase sockets in my workshop to clients’ temporarily-installed single phase equipment. My question, given that I want to have pilot lights on the boxes to both confirm supply and to indicate from across the room which sockets...
  12. D

    Single phase board use with 2 phases

    Hello guys new in this forum. In my 19 years as an electrician I've never seen this. Looking for any thoughts on this. Been asked to install a few new circuits In a domestic garage. There is a granny annex on top of this garage also. Supply is 3 phase in to a 3 phase isolator. From there...
  13. Mark42

    Timer and local thermostat control of 3 x heaters on 3 phases. Wiring logic help please!

    I'm fitting oil-filled panel heating into two rooms of a remote workshop, with (currently) a 20A x three phase supply. Control, for occasional use only, is needed as follows: 1. A wall-mounted and easily-adjustable mechanical timer to set all the heating to come on an hour or two before people...
    • Mark42
    • Thread
    • control heaters help please local logic phases please thermostat timer wiring
    • Replies: 24
    • Forum: UK Electrical Forum
  14. Mark42

    Three phases in single domestic kitchen grid box. OK or not?

    I'm fitting a small kitchen in my remote office/workshop with a limited, existing, supply (3 phase/20A MCB on a long 4 x 10mm SWA). I need to think carefully about diversity and load balancing. My proposed solution is to install individual final circuits for every appliance (Small hob, Small...
  15. G

    Neutral between phases

    I am trying to connect a smart light switch but there is not neutral. Next to the switch there is a socket with a neutral but it is under a different phase. I understand that it is the same neutral for the whole house on all phases, but when I use the other neutral, it short circuits. I checked...
  16. C

    3 phase supply to single phases only 2 phases used

    I went to some holiday cottages today, the main supply in was 3 phase however only 2 of the phases were used. The L1, L2 and Neutral cables were wired into a three phase meter, then coming out was L1 and Neutral, L2 and Neutral to create two single phase supplies which were divided off using...
  17. cliffed

    Different phases in offices

    Originally a Sp DB,now 3pDb 400v. The plans have not been altered to suit,so circuits are the same. Would you worry about the rings are on different phases & close to each other.
  18. D

    Three phases main supply

    Where i can find in the regulations that the always has to be L1 - brown L2 - black L3 - grey
  19. G

    Can you take 2 phases to a consumer unit?

    Hi, I am training to become and electrician, I have passed my C&G level 2 exams. I am working as an electrical improver. I came across a consumer unit today, which has two main switches and two phases L2 and L3 supplying it. Does this board comply with regs? Can you take 2 phases to a...
  20. R

    How do you measure 3 Phase Supply confirming it is correct as in 400V between phases etc.

    I have my AM2 exam and the question I have is how would you confirm supply polarity? Would you do the following tests:- L1-L2 L1-L3 L2-L3 L1-N L2 - N L3-N L1-E L2- E L3-E doing this you should expect 400V reading? Finally, test Neutral to Earth and expect to be 0 volts. Would the main...

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