current

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  1. Jhon M

    Non-adiabatic short circuit current for cable screen/sheath BS 7454

    Hello all, I have a question please concerning the calculation of the non-adiabatic factor for screen/sheath with a case that is not mentioned clearly in BS 7454 If we have a cable with below construction: CU/SC/XLPE/SC/CU WIRES/LEAD/PE outer sheath As per BS 7454 paragraph 6, the formula...
  2. B

    Current transformer metering producing implausible readings

    Edited - please read right to the end! Grateful for any advice regarding CT metering which seems to be generating inaccurate/implausible readings. Our charity has a commercial building with 3-phase connection into a busbar chamber at one end - let’s call us ABC. The rest of the chamber...
  3. C

    Combining cables to increase current capacity?

    I have a problem and I think I have a solution but wanted to throw it out there to check it is acceptable.. First floor flat with two fuseboards - 1 24hr and 1 Night time economy. The boards are being supplied by two armoured cables coming from separate isolators/meters (60A) from the ground...
  4. D

    Current= voltage/resistance

    It is said that current equals voltage divided by resistance however in what instance is that true? A 9-volt battery gives off 2.7 amps I can make a generator that creates 27 volts but only gives off one amp in what way work? You can't tell me that 26 amps is being burnt off by 180 ft of 28...
  5. E

    Motor FLC, Rated current, running current and nominal current.

    Good evening, 1) Is the motor current on the nameplate always the full load current: the maximum current the motor can draw without there being damage to its winding insulation. 2) Often in motor books, I see the term nominal current? is this the current that the motor draws under normal...
  6. F

    what is tabulated Rating of current

    Dear friends, I am learning electrical design and during this process I have seen a new term "tabulted Rating" could you please guide me?
  7. C

    Opinion on current fusebox

    Hi, Moved into a property of late that has the following fuse box. Got advice telling me that it's safe, but doesn't meet current regulations, as well as that it could go in the next year, or last another 15. Want to get opinions on next steps. Ideally, I'd like to replace it with a consumer...
  8. diywarrios

    Cooker hood - connection but no current

    hi all, i recently bought a flat and got a years old cooker hood in it.. which i am trying to replace.. all done but the connection inside it does not have power... tried all the switches on and stuff but still no joy.. any place where is should check .. or how to find the fault or where the...
  9. T

    What household items need a 6mA DC leakage current detector?

    Hi, Electric car charge points need a 6mA DC leakage current detector. This is supposedly needed since the EV contains a high voltage DC battery....and the insulation between the high voltage battery and the mains line and neutral may fail. Document showing Why 6mA DC leakage detectors are...
  10. J

    Why is my power supply giving more than it says it should?

    Hi, I'm new to electronics and exploring the basics so please please forgive me. Currently I have a simple circuit with a 12V,1A PSU, bulb and mulitmeter. When using the multimeter to meaure the bulb's resistance I get 4.5 ohms and then 12V for the voltage across the bulb. According to Ohm's...
  11. lothian

    DMM Showing Current without Current Source

    I am attempting to use my DMM to identify a parasitic drain in my car's electrical system using a Chinaseum-brand DMM with an amp clamp. After I set the thing to DC amps and before I clamp it to the target conductor, it displays a range between 0.1A and .22A. This makes t'shooting with this...
  12. S

    PVC vs Galvanised Conduit: Current Capacity Enclosed In a Thermally Insulating Wall?

    Is there any advantage from the perspective of current ratings/de-ratings of using galvanised round conduit over same size PVC conduit? With both to be chased/buried in brick wall and plastered over? If so, where is this specified? Cheers
  13. C

    Time Current Curves of Various MCBs and MCCBs

    Does anyone have a link to various time current curves relevant to UK MCBs and MCCBs in the 16-1,200 amp range? Specifically, how many times the handle rating does it take for each to trip at 10, 5 and 1 second.
  14. L

    which is the current easiest T & E to work with ?

    I like Prysmian cables . But would like to know if there are better ?
  15. B

    SY cable current rating ??

    Hi All got a question regarding SY cable. I have tried to find the current rating for 6mm SY cable and have found a data sheet the GEM cables which states 33 amps in conduit thermal wall and 54amps when in free air. Also seen a few other manufactures state these ratings but a lot stating...
  16. R

    If all circuits are rcd or rcbo protected max current 150mA why do you still have to install 16mm earth

    THIS IS FOR ELECTRICAL NEWS ONLY
  17. L

    How do I determine the current needed for my truck's wiring harness?

    Howdy, y'all, new member here. I'm making a new engine harness from scratch and I'm a bit confused by how much current capacity I need my truck's wiring harness to have. Based on the fuse ratings, it needs to be able to handle 210A but that doesn't make sense to me because that would be about 7...
  18. S

    My MCB is ON but no current.

    Hello, In my kitchen, I make multiple sockets that are controlled by one MCB. For some weeks, I don't know why the MCB used to trip and I used to turn it back ON. One day the MCB didn't go to the off position but all those sockets stopped working. I pressed the test button on the particular MCB...
  19. Designmen90

    Current transformer - wiring

    Hello ?, is there any regulation of wire cross section for current transformers? Somewhere I read that wires from transformer to Amp meter (for example) should be minimum 2.5mm2, but on some other site I read that it must be minimum 4mm2 ?. I don't know where I read it, but I read it. What is...
  20. L

    Why does my current clamp meter show large current in gas pipe?

    Went to a house this morning to locate a fault causing the RCD in a split load board to trip. Going through the usual tests, I decided to put my earth leakage clamp meter on the earthing conductor. Here is where it gets weird: with the main switch in the off position, the meter was reading...
    • loz2754
    • Thread
    • clamp current gas large meter pipe
    • Replies: 22
    • Forum: UK Electrical Forum
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