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short circuit

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  1. J

    BS 1361 main fuse short circuit capacity/overload at ka ratings explained.

    Hi. I am an apprentice electrician, and was wondering if anyone could help me as I'm getting confused with something that's probably quite simple. If I am correct to work out the amps running though an appliance you do w/voltage. So 10kw/240v = approx 42amps. Of I'm correct in this? My boss...
  2. R

    Mind the short circuit!

    Anybody ever taken note of the risk in trying to change the direction of run of a motor running in star-delta mode?
  3. H

    New Zealand "live" short circuit

    Hi all, I'm a translator, translating a Portuguese text into English that includes a list of electrical faults. One of those is described as a fault that occurs when you connect two positive poles in a circuit. What is that called in English? The literal translation of the Portuguese term is...
  4. J

    Short circuit capacity & max zs

    Hi all. I tested a building last week where they had used bs 3871 and also bs 4293 rcbos/mcb's. I can't seem to find the ka of these and also the max zs permitted.
  5. J

    MCB short circuit capacity

    6 amp BS EN 60898 .....6ka being the maximum fault current the device can handle, although the device may no longer work after that. The 3 underneath this being the fault current (ka) the device can handle without damaging it and then being able to be reset. I have been told 2 different...
  6. i=p/u

    Short circuit current

    3.6v, 4 ah , em batt pack shorted in my pocket and burnt a hole in jumper, what current was flowing or was it the discharge , smokey, thx wise one
  7. A

    how do I khow what is short circuit capacity (KA) on DEIC

    HI Can anyone help me understand how I work out the "short circuit capacity(KA)" for Domestic Electrical Installation Certificate. Sorry struggling with this one.:blush5:
  8. B

    Circuit breakers short circuit ratings

    Hi im looking for a list of Circuit Breaker short circuit capacity ratings, that i can stick into my BGB. list required would be for all fuse types, from BS 3036 to BS88. old and new types protective devices. Also is there such a thing as fuse wire sizes gauge card? if so can some one point me...
  9. rustynails

    2392 Question - Balanced prospective short circuit current between lines

    The prospective short-circuit current between line and neutral is measured at 900A. The maximum balanced prospective short-circuit current level between lines, as a rule of thumb, can be assumed to be approximately: A: 0.9 kA B: 9 kA C: 90 kA D: 1.8 kA :banghead:
  10. B

    200A OPD 3 phase short circuit capacity

    Hi all Any of you know whether there is a table or other source (other than waiting on hold for ages or opening the fuse covers)to find the short circuit capacity for a 200A main fuse in a 3 phase 40 year old supply? Also is it going to be BS88 or 1361?
  11. H

    Four core Power Cable Short Circuit

    Hello Everyone! Refer to the subject, please guide me in a situation, there is a power cable 25sq. mm, 4 core pvc/pvc non swa buried directly in ground and in some ducts.The cable has damaged anywhere and it shows short circuit between every conductor.I have tested with a uni-T multimeter, it...
  12. I

    How To Track A Short Circuit In A Lighting Circuit

    I am a DIY amateur electrician who has a problem with my kitchen lights. The fuse continually pops about 5 minutes after switching on the kitchen lights (a chandelier and 2 wall lights). The bulbs are low energy so total load is <100w and the problem occurs even when all of the bulbs are...
  13. C

    Short Circuit Capacity 3036 fuses

    can anyone tell me the short circuit capacity for BS.3036 rewireable fuses please.
  14. P

    Peak Short Circuit Current value on the SSEG form.

    I've looked at the easy MCS guide on here, and it's not clear, (in my eye's) to what value you place in the part where it asks for this. I've done a pscc test at the AC isolator with my fluke, and it's giving me a reading of 600A. Is this what they want? There's no mention of it on the SMA...
  15. L

    Impedance of short circuit path??

    Hi, Probably fairly simple but I'm learning. Have an example for working out fault current/disconnection times. "A 10mm PVC sheathed MI copper cable is short circuited when connected to a 400V supply. The impedance of the short circuit path is 0.1 ohms. Calculate the permissable disconnection...
  16. S

    Prospective Earth and Short Circuit Current, Earth Fault Impedence

    Hi I'm curent sudying for my 2330 and we have starting looking at the above, however I getting a little muddled/confused. Can someone please help me with some definitions and the us of the following, why we look at them? Prospevtive Short Circuit Current? Prospective Earth Fault Current...
  17. K

    Prospective short circuit current test

    Hi all, fairly new to the forum so youll have to excuse my 'noobiness' as they say. I just watched this video of a guy showing how to carry out the above test. Prospective short circuit current test - YouTube This is taking place on a 3 phase supply. Does anyone know why he doubled the value...
  18. S

    how to do the irradiance and short circuit test

    ok here is my question, i had my mcs audit last week and all went fine, the only point he pick up on was my short circuit and irradiance test, how do you do this test and how do you calculate it, i thought i got told on my course not to short the panels out as you could damage them, but the...
  19. C

    Short Circuit Capacity ratings of Various BS Fuses / breakers

    Does anyone have a definitive list for the KA ratings of the various BS fuses/breakers please. Thanks in Advance
  20. L

    Short Circuit Capacity

    Hi Guys Any advice would be much appreciated! I have tested a property that has a PFC greater than the short circuit capacity of the mcb's protecting the final circuits, the PFC is 7.9KA and the 60898 mcb's 6KA. The property is protected at origin with a 1361 type b fuse 16.5KA. Under the...

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