current

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  1. S

    Please solve this SCR Current rating confusion!

    If SCR has 9000amps at 50hz non-repetitive current rating. What will be it's non-repetitive current rating for 35uS ?? Or Can we use this SCR for 3600amps / uS for 35uS ?
  2. M

    5v 2.5 amp adapter (IN 230v ac 0.2 amp max) damaging when connecting to a high power line which is carrying 50 amp current

    Hi, I have a product in which 5v 2.5 amp adapter (input 230vac 0.2 amp max) used. The adapter is burning out sometimes usually when I connect it to the one of the phase (in 3 phase line where ac >30 hp motor is connected) carrying upto 50 amp current. Now my question is why the adapters are...
  3. N

    Type B rcbos and inrush current

    Does any one have a rough idea how many 24w led panel 600x600 could go on a 10 amp type b rcbo with out tripping or a 6 amp type B rcbo I found a long circuit that complies with zs when a direct measurement is taken at its furthest point , but on length alone im sure it does not comply by...
  4. davesparks

    Calculating inrush current for magnetic ballasts

    I need to, as accurately as possible, establish what the inrush current is for some large metal halide floodlights with magnetic ballasts and I'm drawing a blank. This is for a switchgear/DB replacement I am in the planning stages of and need to know whether these circuits can be fed from MCBs...
  5. J

    Advice on fatal current (research project)

    Hello, This question is purely for research purposes. In the event that an appliance (hairdryer) was dropped into a bath with a person on it, and a circuit breaker was tripped in the consumer unit, could this shock still prove fatal or would the breaker save their life? I know that this is...
  6. F

    Can workers share a van in Covid restrictions?

    I’m taking two guys back from furlough tomorrow. In Scotland. Does anyone know if they can share a van or is it still one can each due to current restrictions
    • fraz
    • Thread
    • anyone current scotland share still taking tomorrow van
    • Replies: 10
    • Forum: UK Electrical Forum
  7. N

    Design current?

    Hey new to the forum And learning to be an electrician. I have a few questions about voltage drop. I understand the formula and all that for example if I had 25 led lights at 24w each spaced evenly over a distance of 65m fed off a type c 10 amp mcb would the design current (lb) used in...
  8. C

    Is this true? BS1363 current rating.

    I thought both sides could each handle 13 amps? View: https://www.reddit.com/r/electricians/comments/hpywd5/reminder_to_my_uk_sparky_friends_that_a_double/
  9. T

    UK 12 volts light, unknown in current watts and volts?

    Can someone help me, I have a Christmas tree light that plug into a car 12 volts cigarette socket. Last Christmas one of those bulb was fused, today I am prepare to find a new bulb but the bulbs doesn't show what volts and watts so that is the difficult part. I have 10 bulbs on a tree so is that...
  10. Pretty Mouth

    Max circuit length for LEDs powered by constant current driver.

    Hi all. Constant current LED lighting is a new concept to me. Not that difficult to get the head around, but I cannot find an answer to the following question: How do I determine the maximum length of a ELV LED lighting circuit powered by a constant current driver? For a constant voltage ELV...
  11. D

    What happens when current flows through the earth? Does it trip?

    Supposing I fit a metal light fitting, and I do a terrible job - and the live comes out from the terminal screw and hits the fitting, but it's well earthed - current will flow through the earth cable (hopefully) providing a circuit with less resistance than if I touch it. When this is happens...
  12. 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.
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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
  19. 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.
  20. 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...

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