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  1. S

    IR test @ 250V across N & E bars?

    If I test as in my title on an old board, what reading should i get that will not start tripping an new Rcd board Steve
  2. E

    Need Explanation of Voltage Drop Please...

    The calculations for Voltage drop as described in the IEE Regulations book is shown below: The actual voltage drop is given by: mV x Ib x l 1000 = 7.3 x 37.4 x 24.5 1000 = 6.7 V (well below the maximum of 11.5V) This voltage drop, whilst not causing the kiln to work unsafely...
  3. S

    Evil c50 board, kA rating

    Can any one help? Iv been sent to do some test and inspections and have come across our arch enemy the c50 board!!! It's due to be replaced but it's got to be condemned first. Dose any one know the kA rating of the c50 breakers bs no: 3871, I ask because the customer is requesting all breakers...
  4. J

    Across the line and y-delta connections

    hi, i just want to ask at what Hp rating should i start to use the y-delta connection instead of the across the line connection. the main would be a 3Ph, 50Hz. thanks in advance.
  5. G

    Voltage reading between Line- Earth. Neutral-Earth 240 V AC

    I have been following a thread on another forum in which a guy reported that the neutral bar on a fused board was at times "glowing hot" At other times, when a neutral was disconnected there was a spark. This was on a 240 volt single phase AC supply. He also reported that when measuring...
  6. C

    Volt drop across 24awg cable

    this cable is 7 strand 0.203mm diam for each strand, metal braided screened. What would be the volt drop across 250 foot? Great site!!
  7. A

    Calculating the voltage drop across a PVC insulated cable- 35mm copper conductor

    I am adding a new Air handler panel to a building and its load is 5421KVA. How do I go about getting the the start up current when the phase voltage is 240V? On obtaining the Start up current, now how do I calculate the voltage drop when the cable that I am thinking about using is the 35mm sq...
  8. B

    Can anyone tell me the size of the MEM fuse box

    HI everyone I have a picture of a old MEM fuse box,which i need to know the size of, it is a job I am pricing for and dont know what size consumer unit i can fit in the small space vailable. The job is a long way from me and i dont want to waste half a day just to measure a space
  9. B

    Zs reading across RCD

    Hi all with a heathy ZE ..22 on a TN-s system i had a R1+R2 of .40 oh my suprise to find that the Zs was 1.01at the furthest socketrechecked my ZE.22?? rechecked ZE from out going terminals of RCD .60 has any one else found this ps i realise that this reading is fine as RCD protected just...
  10. G

    Sensor, Relay and back EMF - 24VDC??

    Hi, I am using an ifm sensor to detect a product coming down the line in our factory. I have connected this sensor in such a way as to energise a 24VDC Relay. No PLC involved here. It does the job perfectly and I am happy with it. Anyhow, I was just wondering if I should be using a surge...
  11. sythai

    Anyone come across this before....?

    Cement board !! Right pain in the ...... Went to go and first fix kitchen today, thinking it would be nice and easy plasterboard, should have looked a bit harder on my survey.. did give it a tap and sounded ok/plasterboard'ish:rolleyes: Right nightmare to cut out, think the only easy way...
  12. D

    RCBO tripping out

    Had a call from a client RCBO feeding socket outlets would not stay made live Even with no appliances plugged in. Arrived and tested the circuit to find a phase/cpc short Broke the circuit down to find that both legs of the ring from the board Showed the fault Disconnected the RCBO tested the...
  13. I

    no Fly lead on RCBO

    Have done this thread with pics this time Has anyone come across an RCBO with no earth fly lead? It was in a new commercial installation and installed on a merlin gerin pan assembly How long have these been out, any ideas? Check out the photos and can anyone say what make it is ...
  14. G

    AC table saw motor only seeing 90V across the inputs?

    I bought an old Craftsman table saw (circa 1982) a couple months back and today the motor stopped turning, instead it started just sitting there making an electrical buzz. I've got it apart and all the connections and stuff looked good, so I broke out the multimeter and measured the input...
  15. flukey

    annual assessment

    annual assessment over and done with :p back to work to pay for it now :eek:
  16. B

    Bad Workmanship

    After numerous jobs having to go along and rectify very sub standard work its started to get me thinking. The more common things i come across is poor labelling at dist boards, Cables not sized right, inadequate protection jobs half finished. I recently came across a 13amp double socket wired in...
  17. jibjob

    Intermittent Fault Headache

    Visited a property today that has an intermittent earth fault. RCD trips sometimes 3 times a week sometimes once a month but it's been going on for some time now and owner wants it sorted. IR'ed across N/E and L/E and all ok until the boiler is switched into circuit. Then the L/E values dip to...
  18. A

    Anyone come across this before?

    I'm on a job - full rewire - where the cooker control switch unit it mounted on the side of a window opening. (On the side of the opening at 90 degrees to the window pane and wall beside it, if you see what i mean). The thing is ... I can't see any way of keeping the control switch there and...
  19. O

    Two way two wire switching

    We have come across an installation with only two core cable supplying both switches, the earth is not used and only common and l1 are used on both switches. Can anybody supply a diagram of the wiring of such a system?
  20. H

    using voltmeter

    What will happen if we use a voltmeter to measure current in a circuit. I mean if we connect our voltmeter leads at different points on current carraying wire/coil?

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