current

  1. M

    checking dc current in ac installation

    how do you check if you have DC current in CU for the purposes of saturating a type AC RCD causing it to malfunction.Thanks Mack.
  2. J

    Time / current characteristic curves...

    Just trying to clear something up for myself, hoping someone can put it into layman terms for me. I'm looking at the time / characteristic curves in 7671. For example, 60890 Type B curve, p. 370. Taking the example of a 32a breaker, the line flattens off vertically at 160amps. All understood...
  3. Electrokids

    Accidentally measuring voltage with probe attached in current channels

    Hi How you doing? So i was accidentally measuring voltage with probes attached to current channel on my multimeters, and then suddenly "BOOOM!!!!!!!!" there's a blast at the end of my probes and the socket. Blackout are happen in my house after my mistake, thankful that the current of 220 v...
  4. S

    Earth current

    Hi Everyone! We build a 3 phase electric grill at my company.The grill has 6 elements.The elements are connected in delta, but.. 4 elements work with a thermostat and 2 element work with an energy regulator. So thermostat 4 elements connected: L1-L2 L1-L3 L1-L2 L1-L3 Energy regulator 2 elements...
  5. J

    Calculating Fault Current...

    Hi all, quick question, hoping an easy one to answer. Just need to clarify this up in my own head. When calculating fault current from Zs, do I take Cmin into account? For example. Zs is 0.54 ohms So to find fault current I would calculate nominal voltage / Zs So 230 / 0.54 But, should I...
  6. H

    Maximum Current Draw

    Hi I am looking at buying 2 NEC PA653UL projectors to stack them to create 1 projection image, but when looking at the input current specification I am in doubt if this is going to work. The input current specification states that it can draw from 4.5A to 10.2A, which seems unnaturally high...
  7. Y

    How do you choose the Rccb Rated Current

    Hi everyone, How do you choose Rccb Rated Current at the your country? Do you have an official document about it? What do you reference for nominal current coordination with mcb before it? How to calculate the rcd rated current and mcb rated current coordination, is there a document about...
  8. G

    Electrical system design 615 level 3 help!!!

    Hello everyone I am doing my level 3 electrical system design project 615 and I need some help with design current etc. at the moment all the colleges are closed so i am unable to find any help from teachers. i would really appreciate if someone show me the right path how to calculate it.
    • Garry0256
    • Thread
    • current design doing electrical electrical system everyone level level 3 project system
    • Replies: 21
    • Forum: UK Electrical Forum
  9. J

    Voltage Drop Design Current?

    When calculating voltage drop and using the formula mV/A/m x Design Current x length / 1000 = v Do I use the design current value after rating factors have been applied? Thanks again for any help.
  10. HVManiac

    How much current does car starter motor draw without any load?

    Hello everyone, Does anyone have any information on how much current does a car starter motor draw at no load? The motor specs: Power max: 1.4kW Voltage: 12VDC Armature resistance: 0.7 ohm Brand: Bosch Model No.: 1740374 The starter was removed from the engine when tested. A little history...
  11. M

    How to measure current in multimeter without series connection

    View: https://youtu.be/AVrwvGMcM-Q
  12. K

    Citroen C5 2003 , Extra lights pulling current from trailerplug with ignition and lights off

    Hi, I have encountered a weird problem on my Citroen C5 2003. I have installed two reversing lights on my car which is connected to the Rear foglights on the trailer contact. I have recently been experiencing that when the car is left for 3-4 days without driving it that the battery is too low...
  13. C

    Additional fused spur

    As a rank amateur at electrics I had hoped to have an electrician complete the mains connection to my low voltage garden lighting. Owing to the lockdown this isn’t possible so I’m going to have a go. Question - I already have a fused spur, fed from a double socket, to feed an outdoor garden...
    • Caldy999
    • Thread
    • additional current electrician electrics finish fused fused spur garden going spur unable wiring
    • Replies: 4
    • Forum: DIY Electrical Advice
  14. J

    What is the path current takes in an electric shock.

    Hi I am currently doing my electrical NVQ and have asked a few electricians this question and wanted to clear things up. If we touch an electrical conductor and are standing on the mass of earth will the current flow through us and back to the transformer or just dissipate into the ground. I’m...
  15. Mark Wright

    Short Circuit Line to Neutral where does the current go after the consumer unit?

    Short Circuit Line to Neutral where does the Current go after the consumer Unit? I assume it goes back to the Sub-Station where it is earthed but i'm trying to find this written in a official book etc but finding nothing. Thanks
  16. A

    Why current sensing resistor is so tricky ?

    Hi I didn't understand why when i short the current sensing resistor , the psu/adapter become unstable (voltage dropping and noise) and forever, even if i restore the original resistor !!
  17. A

    how battery current flow

    Hi I know that batteries get constant voltage and variable current , but why (for ex. cell battery) has 5v rating as standard but not 1a std , i mean why the amp change (500mA , 1A , 2A ...) if voltage is always the same ?? (I didn't get that in simulation !)
  18. M

    delta transfomer current

    Hi All, anybody know the formula to find current on delta transformer?
  19. D

    What happen to laptop if run in AC current instead of DC and what are the effects

    Im just asking for curiosity,what happen if plug 240VAC directly to laptop charger port without DC adapter. What are the effect for laptop if plug in 240VAC into laptop???
  20. Jay 1987

    Harmonic current / distortion

    Hi guys I have a question, when we consider the assessment of general characteristics for any installation, who Measures /considers/ enquires about harmonics. is that the job of a normal Installation spark ? If it’s not who does it and how do they test for it? if it is the job of the normal...
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