current

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  1. L

    Type B MCB tripping at higher current rate than cable capacity

    Can someone please explain me how type B MCB can protect a cable if it only trips when current is 3-5 times maximum load? Let's say, 2.5mm radial circuit is protected by 16A type B MCB. Prysmian 2.5mm T&E current rating is 27A. How will 16A MCB protect the cable from overheating and burning if...
    • Luka
    • Thread
    • cable capacity current higher mcb tripping type type b
    • Replies: 9
    • Forum: UK Electrical Forum
  2. A

    3ph Parallel Thyristor Rectifier Not Sharing Current

    Good afternoon all, I have a problem which has really melted my brain this afternoon and I am hoping someone can offer some insight. My company had recently designed and built a three phase thyristor bridge rectifier for our customer. One of our customers requests was that each thyristor had...
  3. B

    Info on device to control high DC current

    I’m looking for information to buy your build an affordable device to monitor and control 1000a DC current from an automotive battery or other sources for electroplating.
  4. N

    UK NAPIT - improvement action - current waste regulation

    Hi all, I was wondering if you could help with this matter. I had a Napit assesment recently and I have an improvement action "To provide evidence of compliance with the above standard" Napit replied to me: "there is a form on the site to complete and send to us to state you comply with...
  5. ManPhan

    02 cable install in 01 MCT: please help me explain it

    • ManPhan
    • Thread
    • cable current explain help install mct measurement please
    • Replies: 1
    • Forum: The Welcome Forum
  6. I

    Can anyone give me the answer and source for this question on current carrying capacity

    Hello I just need to know the correct order and a source which shows me that it is that order please When calculating the current carrying capacity Is the correct order Ib ≤ In ≤ It ≤ Iz Or Ib ≤ In ≤ Iz ≤ It Niceone
  7. J

    Metrel Earth Electrode test - current injector clamp and measure clamp - can i use on domestics TTs?

    Hi Have to say Meterel not been very helpful here. Has anyone any experience of using the current clamps on domestics where you cannot get your current and voltage stakes in the ground near the property? I have a project where it is TNCS, in very rural area prone to loss of Neutral. I have...
  8. newfutile

    Test the (RCD) Residual Current Device or die

    Just seen this label on a consumer unit im testing. As far am im aware no one ever pressed the test button.
  9. K

    IEC 61439-1 - Relationship between prospective fault current and diameter of copper wire

    Hi, I am currently reading through the standard IEC 61439-1 - Low-voltage swtichgear and controlgear assemblies - Part 1: General rules, and on Table 14 it is stated the "Relationship between prospective fault current and diameter of copper wire" (see picture attached). I don't understand why...
  10. S

    Rated Current and Current in mini split AC

    Hello, I am seeing two mini split ACs with the same cooling capacity in two different company. Both 24000 BTU and Inverter. The first one said Rated Current is 9.56 A and didn't write Max current or current. The second one said the Current is 9.9 A and the Rated Current is 16 A. Does it mean...
  11. T

    UK Change in current capacity along run

    Hi, I have a book on domestic wiring which says that everywhere there is a change in current carrying capacity along a circuit there must be some kind of protection (fused spur etc). Suppose I need to run above an insulated ceiling (reference method 101) and then down a wall (reference method...
  12. T

    UK Level 3 Design Project - Design Current

    Hi, I'm doing my Level 3 Electrical Install course, and I'm doing distance learning so most of the work is being done by myself with no guidance. I'm doing the design project, and just had a couple quick questions. Question 4 asks about circuit details for the cafe/pool block, with the first...
  13. C

    Best method to calculate 4 core SWA current rating for two pairs of 1PH line conductors

    Hi, I have a Victron Multiplus-II 5kVA inverter/charger with Pylontech US5000 batteries installed in my house along with a 6.8kWp PV array and associated charge controllers. This installation has full DNO G99 approval and was installed to BS7671 and has been running great for about 18 months...
  14. J

    AC vs DC, live vs neutral

    Hi. I've read much about ac vs dc but can't find a 'simple' answer. If current alternates 50 times per second in a uk mains circuit, why do live and neutral not swap 50 time per second? On these forums, I've read that it does, so that copper does not migrate as it would in a dc circuit. I've...
  15. D

    What do I search for on Amazon: WIFI continuity Switch No current, no load

    I have a bathroom fan with a moisture detector that turns it on and off. It also has a control circuit to turn it on/off when moisture is not connected. This is a no voltage/no current circuit. I want to add a parallel control circuit that would of course be no load no current that I can turn...
  16. D

    Eddy current clarification

    hi all, What are your thoughts on how the 6231 cables been terminated? Will aluminium cause eddy currents? Thanks
  17. S

    Why I get only one phase reading current while rest are zero

    Hi I have UPS 50KVA and the inverter output AC voltage is feeding a distribution panel 120/208 V 4 wires when I check UPS display it shows me that output current which is the distribution panel phases as followings phase one = 30A while Phase 2 = 0A and phase 3 = 0A is this a problem !? Shall...
  18. FS-Ivan

    UK What does the current landscape for mobile apps look like?

    Hi All I'm a professional mobile app developer. Around 12-13 years ago I created a couple of apps for the fire protection / safety industry that a few people found useful. I put those to one side as I found myself switching careers to be a full time developer and skilling up required the whole...
  19. D

    Eddy currents in metal trunking

    Hi all. I am installing some metal trunking vertically in a meter cupboard to contain all the meter tails for an apartment block. I have 5 sets of tails entering one “row” of meters, and about 300mm further down the trunking I have another 4 sets of tails entering the other row of meters. Due...
  20. R

    Current flow in neutral but no voltage ?

    Having a challenge understanding the concept behind why when you measure across line and neutral (live circuit) using voltage indicators we have voltage reading of 230V single phase. If there is current flow in the neutral why is it termed as 0V ? On that basis, second question - If I tested...
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