currents

currents

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  1. C

    3 phase dB and eddy currents

    Recently started a retrofit where the 3 phase dB has been fitted with bushes through the galv trunking. The single phase supplies outgoing have been separated and lines pulled through one, neutrals another and the CPCs through the last one. My supervisor says this is ok, as it is a 3 phase db, I...
  2. T

    Eddi currents and conduit

    On a domestic Cu 60 amp would live and nuetral tails cause eddi currents of any significants if the tails were run in sperate metal conduit but then run through the same tails gland at the cu? IM sure the answer is yes
  3. M

    Hey guys, what does for example 300A rating on a 3 pole MCB means?

    Hey guys, what does for example 300A rating on a 3 pole MCB means? Does it mean each phase carries 300A i.e. (Current in R=300A, Y=300A, B=300A) or it represents total currents in all the 3 phases i.e.(Current in R+Y+B=300A)? Please assist, it is confusing me a lot with my calculations of...
  4. L

    UK Eddy currents??

    After a bit of advice. Have a 630A MCCB feeding a DB, it's fed with 4 x 300mm single core, non armoured HO7 cables and a 185mm earth. The DB is GRP and plastic compression glands have been used. The main panel has an aluminium gland plate and brass A2 glands have been used, however, the lock...
  5. 0

    Designing with LED driver inrush currents

    Hi, I am just trying to get my head around designing circuits with high bays, in particular the inrush current from these lights. So say I've got 10 (for ease) 150watt high bays (6.5Amp load @ 230v) with an inrush current of 40amp fitting (400amp) . The instaneous trip current for a 10 B...
  6. S

    Question regarding eddies currents 3 phase

    I have to supply a 3 phase + neutral circuit but I have to run it through a contactor. The contactor is 3 phase no neutral and will be bushed onto the left side of the board with 2 bushes (one for feed, one for load). The other side of the board is bushed onto some trunking where the load will...
  7. marconi

    THE BATTLE OF THE CURRENTS - THE FILM

    https://www.empireonline.com/movies/reviews/the-current-war/ fyi :) M ps: Don't tell Duncan Norman
  8. James

    Lets Talk about Large Earth Currents

    I have a customer who called me in to look at a small electrical fire. They are a welding and fabrication company and have several welders operating on site. The circuit pointed out to me that had been on fire was a 3 phase 16A supply for a floor mounted crane. the crane is able to rotate on a...
  9. marconi

    CAPACITIVE LEAKAGE CURRENTS AND TRANSFORMERLESS PV INVERTERS

    I have spent some time reading into PV panels and inverters while trying to help with a current post on nuisance RCD tripping at a PV installation on a farm. I happened upon this technical paper which explains capacitive leakage currents from PV arrays and the trouble they could cause...
  10. Dobes_88

    Inrush currents and solutions......

    Good evening! Wanting to pick the brains of people more experienced in this field, approaching 2nd fix stage of an ongoing rewire where the client wants a shed load of lights throughout. What particularly worries me is the hallway and kitchen grid switches where there’s around 10-12 lights...
  11. M

    High Peak Currents

    Hi Had a data logger installed on the mains supply of one of remote buildings on the site to see if their is enough capacity in the supply to allow for the addition of 103 additional double sockets. The data logger was installed on the mains incoming to the building for 3 days and the logger...
  12. D

    LED inrush

    I'm going to look at a job this week at a warehouse which requires replacing all the existing 6 foot twin fluorescent fittings with LED versions. They've requested the fittings are kept as they're relatively new so will look to bypass ballast etc. Not sure on the number but it'll be a few dozen...
  13. NDG Elecs

    Measuring inrush currents.

    Hi, Apart from spending £300 on another clamp meter (although I am tempted!) is there a cheaper way to measure inrush currents? Can't seem to find anywhere to hire one either for less than £100.00. Oscilliscope either. This is a one off job and am curious about the actual inrush on some LEDs...
  14. Pete999

    Eddy Currents

    Just a thought I would appreciate some comments on. I was at a loose end the other day and ended up watching some guy on you tube talking about Eddy Currents with regards to metal enclosures especially domestic Consumers units. On no I hear you say not amendment 3 again, but stay with me...
  15. S

    Inrush currents

    I need a bit of advice with inrush current on lighting. I have been reading through the IET circuit design guide & i cannot seem to find any answers to my questions. 1. Should the cable be rated at the running current or the inrush current? I was taught at college that the cable should be...
  16. E

    PV field irrigation system using a 3 phase pump...

    Hi to all you solar chappies, Need a little advice on a 11KW stand alone PV irrigation pump installation. Not done much at all with PV installations and trying to get some of the information i need off the internet is proving difficult especially as it all takes loads of time going through...
  17. B

    Calculate 3 phase amperage

    How do you calculate your amps for a 3 phase motor starter
  18. B

    Inrush currents for a three phase induction motor

    Hi all, was wondering if anyone could help me with this. I have had a three phase induction motor rated at 85.8amps full load and voltage is 480volts connected in delta. My question is that when I was first starting up the motor it kept on tripping the main switch due to the inrush currents. The...
  19. S

    Eddy currents

    A 3 phase DB has been wired with 3 X 25mm lock nut and bush into steel trunking, The ballbag has taken earths in one, neutrals in another, and phase conductors in the 3rd. As im missing this bit of technical information, Do you get eddy currents if you have 3 phases going in one hole, or just...
  20. W

    Testing 110v/ac and Filling in EIC forms and max fault currents

    Hi all I am currently testing a lot of 110v/ac circuits. These are fed from a db which is supplied by a 110v transformer. the MCB's are double pole 6a 60947 schnieder. My questions are: 1. What is the max zs for the device? 2. do I need to put anything special on the eic forms Thanks

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