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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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.
  6. 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.
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. M

    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
  12. 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 !!
  13. 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 !)
  14. M

    delta transfomer current

    Hi All, anybody know the formula to find current on delta transformer?
  15. 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???
  16. 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...
  17. S

    RCD types and DC current

    So, this article...
  18. R

    Advice on current path

    Morning gentlemen I am looking for some solid advice from fellow sparks on best route to go. I have been an electrician for 13 years. I started off in the domestic and commercial installations side of the industry. Completed my apprenticeship etc etc. 2009 hit and I was made redundant so I...
  19. R

    what do the current values mean in this meter?

    In the picture can be read 10(40)A. What is the capacity of the meter 10 A or 40 A, why are there two values?
  20. Basiluk

    Current monitoring display

    I am after a LCD/LED display that can be wired into a circuit (240v < 15a) and display the wattage/amperage being drawn on that current. I am not after a meter, but a continual real time display of the load on that circuit - This is for permanent installation. I cannot find anything that meets...
  21. dave_JL

    Which Oven To Buy With Current Wiring Set Up?

    Hi guys, Looking for some advice. We have this induction hob from IKEA SMAKLIG Induction hob - black - IKEA - and a hotpoint single oven which has given up the ghost and needs replacing. I'd like to buy a replacement oven I can...
  22. R

    Ordered new breaker and want to make sure it matches the current breaker in the breaker box that needs replacing.

    I ordered the exact breaker that is in the breaker box and they sent me this one. I want to verify that it is compatible with one in the breaker box. I took a picture of each. Thanks in advanced the company won't answer their phone so I'm kind of stuck until I find out!
  23. G

    Regulation 434.5.2 - Time a conductor can withstand fault current

    Can anyone help me clarify the formula in regulation 434.5.2, the time a conductor can withstand a fault current without sustaining damage. t=k2 x S2 / I2 The regulation states I is the effective fault current. Does effective fault current mean the prospective short circuit current/...
  24. Video Explaining Kirchhoffs Current Law | Electrical Theory Videos

    Video Explaining Kirchhoffs Current Law | Electrical Theory Videos

    This electrical theory video introduces and explains Kirchhoffs Current Law to electricians and electrical students and trainees.
  25. A Basic Understanding of Voltage, Current and Resistance.

    A Basic Understanding of Voltage, Current and Resistance.

    An easy to understand lesson in Voltage, Current and Resistance for electricians. Learn about the basics of voltage, current and resistance in this video tutorial.
  26. O

    Current limited charge relay

    Hi there, I am looking to charge an auxiliary windlass battery (130Ah lithium) that is located 35 feet away from my main bank (1030Ah lithium). My charging input will range from to 40 to 100 Amps, but I need to keep the wire size to a maximum of 6AWG. Do you know of any current limited charging...
  27. Megawatt

    Will isolation transformer absorb in rush current and not the generator

    I have a 10,000 watt surge and 7000 watt running capacity on a 240/120 vac generator. Now this is a theory I have electric heat with 10,000 watt heating elements. When the heating elements kick on it bogs down the generator to the point I have to kill the heat. The question is if I bought a 15...
  28. D

    Megger 1552 (Hi current test not tripping 30ma rcd)

    Hi guys, I own 2 megger mft 1552 testers. I recently found that loop readings on both testers give me high Zs readings on final circuits protected by 30ma rcds on low current. If I select the hi current setting I get a reading I expect to achieve, but the hi current test never trips the rcd...
  29. M

    Do I need over current protection?

    Hi guys, i'm working on some project, do i still need over current protection if i'm using a soft starter and do I still need circuit breaker for that motor???
  30. D

    High Earth current flowing

    I have measured high currents in the CPCs of four circuits as shown in the table below. This is the case both with the circuits energised and isolated. Removing the CPCs for these four circuits brings the current in the MET to DNO cut-out, back to genuine L+N measured leakage levels. However...
  31. 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...
  32. 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...
  33. 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...
  34. T

    USA 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...
  35. 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...
  36. 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...
  37. F

    Industrial 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...
  38. 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...
  39. 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
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