inrush | Page 2

inrush

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  1. 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...
  2. J

    LED ceiling tiles startup current

    I have been asked to quote a shop fit out that will have 52x 45w LED ceiling tiles overall. they would like 12 switched at a time if possible, but on a previous job I only had 6 on one switch and had to use a 10A C-type MCB just to sto pthem tripping out on startup. I was thinking of wiring...
  3. 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...
  4. J

    confused

    Testing existing installation, notice one circuit that supplies 10 * 30 watt LED lights has a 16 amp mcb protecting it. Change the mcb to 6 amp and it instantly trips, thought maybe I'm missing more light fitting on circuit. Used my clip on ammeter and it reads 1.7 amps, all dead tests and live...
  5. carl9254

    LED Floodlight

    Hello. Just a quick question. Got 8 140w led floodlights running on a B20 mcb. The lights come on through a mechanical timer but the customer says everytime the timer switches it trips the mcb. But they work fine when the manual switch on the timer is pressed. Can you run LEDs of a manual...
  6. G

    100m switch line

    I have to put 25 led down lights in a garage , customer wants them all on one switch line which will be 100 metres long. I'm going to use 1mm. Should I break them down into two lots of 14 ?
  7. i=p/u

    Switching

    COULD ANYONE SEE A PROBLEM WITH SWITCHEN 50 X7 WATT LEDS AT ONCE http://www.websparky.co.uk/acatalog/WS-inceptor.pdf
  8. S

    Led tubes help

    Took down a 6 ft light fitting and replaced it with a 5ft LED twin fitting, I had to change the MCB from a 6a to a 10a MCB because the 6a keeps tripping off, Is there a big start up current on LED tubes?
  9. Z

    Type D 40A MCB upstream of BS88 63A Fuse

    Can anyone help with the time current characteristics of which will operate first? Essentially a 40A type D crabtree pole star fed from a BS 88 g 63A fuse. Looking at the time current characteristics I reckon that the BS88 would operate at a fault current of 500A for a 0.4s disconnection whereas...
  10. F

    Inrush current

    Can anyone give me a simple example of inrush current
  11. R

    Isolating transformer to deal with inrush currents?

    I have a problem at a remote site in Africa where we are running a couple of prime power generator sets (FG Wilson 220/380, 50 Hz (1500 rpm) 450 kVA (409 kVA prime power) single set operation, no synchronization, controlled by a transfer switch. The alternator is connected star, and earth...
  12. M

    Type c RCBO

    Hi all I have recently obtained some type c RCBOs, can anyone tell me if these would be ok to use in a domestic consumer unit, they are wylex and MK. Not sure if they would fit. Thanks in advance.
  13. J

    Inrush Current

    Can anybody tell how to mathematically calculate 'inrush current'? Im talking of the current that rushes into lets say a light bulb on start up. Any info would be appreciated... Ta very much...

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