current

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  1. K

    Current Transducer Wiring

    Hi All, i'm new to the forum and looking for a solution to measure the operating current across the point machine. Hence selected the current transducer(to read in 4-20mA) as per attached schemtic. The required wiring terminal nos of the transducer is shown in the model diagram. i want to wire...
  2. S

    Low current device on lighting circuit

    I've had a new smart door lock fitted to the front door. In order to get best usage I need to run a small electronic device called a bridge which will link this lock to the internet via bluetooth and wifi. The bridge requires AC power and is deigned to be plugged in to a socket. It needs to be...
  3. D

    Current Clamp Question

    I have a Megger MFT1741 with current clamp, also a Fluke 117. As the MFT can't record min/max, I'm using the current clamp with the Fluke multimeter, following Megger's instructions and understanding the 1000:1 step down ratio. Just taking some basic readings on known values, the results are...
    • Deleted member 105166
    • Thread
    • clamp current question
    • Replies: 8
    • Forum: UK Electrical Forum
  4. T

    Flow of current in a neutral wire

    I am taking this HVAC class and have been studying up on the basics of electricity, magnetic induction, AC/DC, Ohms Law etc. I have a basic question concerning the flow of current in the neutral wire of a single phase 120v circuit. I ran a few questions by my instructor (Mr. Samuels). He was...
    • timberfinn
    • Thread
    • current neutral neutral wire wire
    • Replies: 16
    • Forum: USA Electrical Forum
  5. HappyHippyDad

    A question about how current travels through the real earth?

    When testing Ze on a TT the only connection between the line and the earth rod is the actual ground. When you do a Ze is it actually sending a small current through the actual ground from the earth rod at the house to the earth rod at the transformer? Also, related to the above, I have 2...
  6. Doomed

    current carrying capabilities

    So came across some old aluminium T&E yesterday, the smaller stuff with only 3 strands in the live, 3 in neutral and single strand for CPC. I cant remember its maximum current capability. Its been used for running an immersion tank on a B16 MCB, about 10m from the dis board, mostly under floor...
  7. F

    Measuring current using a Shunt Resistor & an Oscilloscope

    Hi people, I'm new using forums for this kind of purposes, so please forgive me if I can't explain myself well, also if this is the wrong sub-forum please tell me ¡. I have to measure the output current & voltage of a High Frecuency, High Voltage transformer, I can measure the Output Voltage...
  8. 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...
  9. Diver233

    - Prospective fault current test 2391

    Hello all, I’m now overthinking the - Prospective fault current test for the 2391 practical, the exam boards will be a 3 phase and a single phase board. Do I test the three phase board and double the highest and use that for both DB’s or do I do one for 3 phase db1 and sep one for single phase db2
  10. D

    ABB VSD Current Draw

    I have specced up a 18.5kw VSD to power a 15Kw pump. On the datasheet ABB ACS580 18.kw its current rating is 38A. Should i spec the MCB and circuit etc to 40A or just to the current draw of the motor (around 28A FLC).
  11. A

    Minimizing leakage current

    Hi everyone, I have a problem in a home. By night time his rcd is tripping for no reason. I made and insulation test between neutral and earth + live and earth and got 4 mega ohms. I made a leakage current test and found he have 20mA. Can somone tell me how i can minimize it please...
  12. HoverSPRX

    Max Demand/Diversity Query

    Hello All, Iv been asked to pick up the remedials on someone else's EICR that was done last year on a school for Deaf Children. One of the items listed on the report is the conductors leading to the sub mains from the main panel are undersized. I popped the cover off to have a look and sure...
  13. L

    RCD RCBO over current

    Hi, I know the basic differences between MCB, RCD and RCBO. I was wandering what happens to a RCD if the current reaches the RCD's limit? Why do RCDs have got ampere rating if they don't protect against over current? In case of RCBO, how do I know at how much ampere they shut down? Is it the...
  14. S

    Current sensing breaker 5A-16A - Caravan application

    Hi folks, there’s a thread running on a caravan forum I’m on so I thought I’d ask on here where the experts live! Caravan EHU supplies vary between 6A, 10A and 16A. So one of the chaps who regularly goes abroad where there are 6A supplies gets ticked off with the wife tripping the bollard -...
  15. R

    Zs reading does not meet current regs

    Doing some prior tests befor installing a fused spur from a radial circuit, and have found the Zs reading higher then the current regs, obviously it complys with a past reg, but as I’ll be doing a minor works for the job, when filling out their cert would I just put it down as an observation in...
  16. C

    Current demand & load per phase Q

    Hi all, This is my first post on this forum. I'm currently doing my C&G 2365 and I've found myself completely stumped on a problem that's probably quite simple, but which I've had a lot of conflicting answers for from various people, which has left me a little confused. I'm working on a design...
  17. K

    NVQ provider. Been let down by current provider

    Hi Can anyone recommend a company that I can take my NVQ with? I have been working on site the last 3 years and need to get it done asap. Thanks
  18. rustynails

    Current generation under control

    You've all seen people on YouTube overloading twin and earth cables, JW etc... How are they generating current and how are they able to control that generation?
  19. l4urence

    Leakage current meter - recommendations?

    I'm looking at buying something for measuring leakage current - The Megger DCM305e (I think). Not specifically for nuisance tripping but more for DC leakage current - type A vs AC RCD (type AC flooding with DC and not tripping). Not a lot of info on the DC side - except DC units for PV, I...
  20. sam400

    Current Regs book for sale

    Blue one for sale in the celophane, purchased from Denmans so genuine book. £50
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