short circuit

short circuit

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  1. S

    How to co-ordinate circuit breakers trip for overload and short circuit?

    Can 50A B type circuit breaker be coordinated with upstream 50A C type circuit breaker to trip earlier on shorts and current overloads?
  2. B

    L-N short circuit MCB not tripping

    Hi all, I’m hoping you can shed some light on a problem I found. Please be gentle, I’m an industrial spark, not a domestic spark. I’ve been asked to look at a family members electrics as they are renovating a room. A cowboy spark has been in and messed the job up. I was asked to come in and...
  3. L

    Electric shower case: short circuits (?) and RCBO

    Hello, I have just posted in the Electrician's section one photo and two videos of what I believe to be a dangerous situation of short circuits happening within a shower unit. You can see (also here attached): 1) Extensive burn marks on the plastic cover; 2) A vast amount of water leaking from...
  4. WhatsApp Video 2021-08-09 at 20.34.17.mp4

    WhatsApp Video 2021-08-09 at 20.34.17.mp4

    Water leakage from electric shower
    • LonniSet
    • Media item
    • rcbo short circuit
    • Comments: 0
    • Category: Electrical Videos
  5. WhatsApp Video 2021-08-09 at 20.34.26.mp4

    WhatsApp Video 2021-08-09 at 20.34.26.mp4

    Water trapped in electric shower
    • LonniSet
    • Media item
    • rcbo short circuit
    • Comments: 0
    • Category: Electrical Videos
  6. IMG_20210819_121629.jpg

    IMG_20210819_121629.jpg

    Burn marks on electric shower cover
    • LonniSet
    • Media item
    • rcbo short circuit
    • Comments: 0
    • Category: Electrical Videos
  7. D

    Tracing a rain-related short circuit

    I have an intermittent short on a circuit with a GFCI breaker and some outdoor fixtures. The breaker pops after a significant rain and won't reset until after several dry days. I've tried to isolate the break by disconnecting the outdoor fixtures sequentially with no luck. Now I'm doing...
  8. Jhon M

    Non-adiabatic short circuit current for cable screen/sheath BS 7454

    Hello all, I have a question please concerning the calculation of the non-adiabatic factor for screen/sheath with a case that is not mentioned clearly in BS 7454 If we have a cable with below construction: CU/SC/XLPE/SC/CU WIRES/LEAD/PE outer sheath As per BS 7454 paragraph 6, the formula...
  9. Daniel DD

    Surge Arrester Installation and External Short Circuit Protection Device

    BACKGROUND I live in a small town where it is difficult to find ceritified electricians. In fact, electrician certification is not common for residential installations. I did find some experienced electricians but I don't think they are certified and know best practices in the installation. I...
  10. N

    Coincidence? Continuity?

    Hello, Back in November I had a dedicated circuit installed for a garage door opener. Over the next few days and ever since I noticed my dryer would sometimes be blinking "PF" (power fail). The breaker was never tripped and by the time I'd notice the error code on the dryer, everything would be...
  11. P

    UK what size fuse should I use in a DC syatem?

    Hello if I have an appliance with a max current draw of 5.55A and an short circuit current of 6.11amps what size fuse should I use in a DC syatem?
  12. cliffed

    Short circuit protection on high resistance on live conductors

    Thoughts on this scenario,obviously a short circuit fault situation
  13. C

    Conductor Short Circuit Temprature

    Ok, say I have a 2.5mm2 or 3.31mm2 copper conductor 90*C rated. 100,000 amps of available fault current. 277/480 volt Y system, TN-C-S. MCB protection. Would the conductor survive such a short circuit? How do I determine this?
  14. Z

    Selv circuit - short circuit - bulbs blown

    Garden lighting 12V AC from transformer wired with 2 wire and extension cables ran 2 LED lights in parallel. Unfortunately water and mud managed to cause a short circuit. The two lamp bulbs blown were further away from the transformer than the fault. Q1. Is this expected? Q2. Is there an easy...
  15. S

    Difference between dead short and short circuit

    Hi looking for some help about faults and symptoms and difference between short circuit, dead short, and overcurrent to know which fault you have. Is short circuit line and and neutral fault dead short zero resistance and a tripped breaker And overcurrent to much current in circuit causing...
  16. N

    Short circuit

    HELLO i had an short circuit in my house!neutral to live short circuit! the 30a old mcb is tripped but the 1361 13a fuse in the plug did not disconected! why did not disconnect 13a 1361 fuse sooner then 30a mcb? I tested the fuse in the plug still good, so the short circuit did not reach to...
  17. I

    Open & Short circuit

    Evening all, I'm new to this so apologies in advance if I'm posting in the wrong threads. I'm an apprentice electrician. Due to the ongoing pandemic, my college assignments are currently being handed out online with very little communication and interaction from the tutors. I'm struggling with...
  18. Q

    Short circuit bypasses mcb and trips submain mcb

    Good evening A cable was loose in a ceiling void causing a short circuit this didn't trip the 10 amp 6ka type b mcb but tripped the 50 amp type b 6ka mcb that supplied that board back at the mains. I am wondering why this occurred other than me thinking the local protection isn't very...
  19. O

    Wiring Mishap - Wondering How Much I Destroyed…

    I'm a DIY kind of guy, and was never really fond of household 120V/240V power before, until I had a friend who used to be a journeyman help me understand enough to wire up my house we are completely renovating. So, after putting some walls and trusses in place, and running conduit all day...
  20. Mark Wright

    Short Circuit Line to Neutral where does the current go after the consumer unit?

    Short Circuit Line to Neutral where does the Current go after the consumer Unit? I assume it goes back to the Sub-Station where it is earthed but i'm trying to find this written in a official book etc but finding nothing. Thanks

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