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calculate

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  1. 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...
  2. J

    Calculate the appropriate size of the protective conductor exam question

    fault = 400 A Operating time of protective conductor = 0.15 s Constant k, for the material of the conductor = 134 a 1.5mm b 2.5mm c 4.0mm d 6.0mm Just want to make sure I've got this right,
  3. JanaWick

    How to calculate the effect of ground Enhansing material (GEM) in Earthing

    Can anyone advice me on how to take in the effect of Ground Enhansing Material (GEM) used in Electrical Earthing to reduse the earth resistance? in all the suppliers specification they only mension the GEM reduse the soil resistance drastically? so should i consider 1/5th,ro 1/10th or 1/100th...
  4. T

    Lost Neutral on 3 Phase system - how do you calculate the effect on line voltage

    I know the effect of a lost neutral (floating neutral) on a 3 phase system, and the theory of why the line voltages can vary. However, I have been attempting to show this by calculating the line voltages of a phase system at given loads on each phase. Lets say:- Red 296 Amps, Yellow 279 Amps...
  5. M

    How to calculate the current used by a BLDC motor under load?

    I'm working on a robotics project and currently we are designing a battery. This battery is dedicated to the motor driver and two BLDC motors. I want to know how much current the battery will draw if we drive the robot at a certain speed. More specifically, how to calculate the speed of a BLDC...
  6. K

    How do you calculate the tollerances from a 3 phase winding measurement

    Assuming that you measure the windings for a power transformer, for example: A-B: 2,258 ohms B-C: 2,262 ohms A-C: 2,250 ohms, how do you calculate the tolerances for these? What formula do you use? You consider as reference the highest or the lowest value from every 2 readings? I just wanna...
  7. sakurakey13

    Level 3 Design Project - How to calculate Zs?

    So I’m doing my level 3 design project at the moment, and I’m on the question where you do all the calculations on each circuit, I’ve taken the max earth impedance from the regs, but it’s asking me for the earth fault loop impedance of the circuit. I think it’s asking me to calculate it, and I...
  8. D

    How to calculate an MCB size

    I am doing a campervan conversion and have a 16A/250V shore power connection coming into a consumer unit which has two breakers - one for the AC input into a Victron Multiplus inverter and the other to go to a plug socket for non inverter loads. I would like to know how to size the MCB for the...
  9. E

    How to calculate site load and availability for expansion?

    I have been tasked with seeing if a site is capable of accommodating a large new installation. I have done some working out but I'm not sure if I am going down the right lines, as this is not my area of expertise. The site has a main fused switch disconnector on the main incoming supply...
  10. B

    Calculate bonding sizes TT

    Hi, searched but still niggling problem need help on... Installation: - 4mm earth to earthing electrode (rod) Ra 42ohm Zdb 33ohm 1361 60A main fuse 16mm tails cant get acceptable result for using adiabatic as disconnection time too high (higher than 5 secs with that Zs reading) no frontline RCD...
  11. B

    Can’t measure R1+R2, can I calculate it instead?

    Hi forum, A question about R1+R2 testing. I’m testing a lighting circuit. It’s an old circuit with old colours. In the control panel feeding the circuit there is no earth cable feeding the lighting circuit, only an earth cable bonding the control panel to the strands of the armoured cable...
  12. S

    Calculate panel loads

    I am currently working on a 400 square ft. ADU for a client. He originally designed it for to use propane for hot water and cooking. He ran 1 1/2" conduit from main panel planning on 100 amp panel. He now wants to eliminate propane and go all electric. Loads are: mini split-19A, water...
  13. W

    Calculate the needed power rating and knowing compatible driver specifics?

    how to calculate the needed power rating to light up 6 cool white and 6 white HPL chip like this ? what is the compatible driver specific to light up 6 cool white and 6 white HPL chip like this ? the 2nd image is the circuit assembly the order is even row is 5 watts cool white HPL LED chip and...
  14. F

    Calculate current draw on unenergised circuit

    Hi, I’ve got a 24v 10A power supply, fed from a 240v 6A breaker, that is breaking, it feeds three 6A type b circuit breakers, the first one I replaced was clearly struggling like it was overloaded and the second just gave up, before I fit the third I was wondering if I was to measure the...
  15. D

    Calculate 3 Phase MCB size

    Hi..I should probably know this but don't do too much 3 Phase stuff!! Can anyone give the formula for working out the size of a 3 phase MCB? I have a 12kw 3 Phase fryer to install. Cheers
  16. H

    how would i calculate the approximate frequency of the sinewave? see parameters below

    so suppose i have a single-pole (first-order) low-pass RC filter that gives me a unity gain upto the corner frequency of 1536Hz and i apply a 12V amplitude sinewave to the input of the filter and i am getting a sinewave with the amplitude of 4.1V from the output of the filter
  17. H

    how would i calculate resistance using Vcc, input impedance and logic-high threshold?

  18. NoMessCharley

    How to Calculate Size of Cut to Set Cable Tray

    I worked with cable tray about 40 years ago and remember I created a couple of simple formulae to work out how much triangular section of the cable tray to cut out to do various sets. I have tried to explain them below. The first one is when you know the angle you want to create and the second...
  19. U

    Calculate Heat dissipation of string inverters

    Hello!! I am using 2 ABB 100kw string Inverters (ABB PVS 100-TL) in a single room. Can anyone assist me in calculating the Heat dissipation from these string inverters. following are the Input voltage information for both the inverters Inverter 1: Vin=720V DC at STC (for max string size of 18...
  20. P

    What do I need to know to calculate size of single phase motor?

    About 20 years ago I bought an old table saw from a local school. I only had single phase at the time so I changed the motor and switchgear as it was 450V. I'm thinking of buying a 3 phase 50s bandsaw and have the same problem, but I can't remember how to work out the size of the replacement...

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