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short circuit

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  1. S

    monitor AORUS AD27QD - short circuit and tripped breaker.

    Hello. I had a good monitor AORUS AD27QD. Yesterday when i was sleep i left monitor on like always. When i woke in morning there was not power in house. Something tripped breaker/fuse. When i turn up breaker and power back in,monitor just refused to turn on. So monitor i guess tripped breaker...
  2. R

    Short Circuit Fault On Honeywell Flex 100 alarm

    Hey, We are putting in a Honeywell flex alarm. It's all wired in (following the manual). The problem is that all the sensors are coming up as having a short circuit and I can't work out why. I've wired it up with my friend (who is an electrician) and we really can't work out the problem...
  3. cliffed

    Short circuit compliance on high Zs readings

    Would you divide the 5.13 ohms by 4. I personally don’t think so. Also the R1 /Rn short circuit resistances are different from the usual R1 /R2 measurements. Found those in an electrical book by,that man. The Zs on this circuit was above the permitted figure,so just had a play around to see if...
  4. C

    PIR parallel to Switch makes short circuit

    Hi, I have lighting in the bathroom plus an extractor fan. There is one switch for the lights and one switch higher up for the fan. I installed a PIR in the bathroom and wnated it to turn both lighting and the fan in parallel to the switch. I fed the PIR from the fan's permanent F and took the...
  5. S

    Help finding fault after a short Circuit( Com with Neutral )

    Hi there Im reaching out here as I have given up trying and couldn't find a local electrician to help today . so the issue . after painting the wall I was try to fit the light switch back into the wall and somehow the com cable touched the metal surround on the wall. the lighting RCBO...
  6. Pretty Mouth

    Short circuit disconnection times

    Could someone shed some light on the following please? 411.3.2.1 implies that the 5s / 0.4s disconnection times only apply to earth faults. I've not found anything else in the regs that suggests they apply to short circuits. 435.5.2 says faults should be disconnected before the fault current...
  7. A

    Short circuit - making me short circuit!

    Hi all, I do hope you can help me with my 2014 Fiat Fiorino. I have a short circuit which has stopped the rear tail light and front side light from working. when the lights are on, ignition is on but the engine isn't running the lights work, the lights work whilst the heater plug light is...
  8. M

    Installing LED strips but not working possible short circuit

    Hi all. Seems like a simple fix just need some advice. I was fixing LED strips in the kitchen today. The switch in the kitchen is a 2-gang which powers the LED strips and the ceiling lights. There are 3 seperate LED strips to go around the kitchen, each connected to an LED driver and power...
  9. Empire

    Crabtree f-60 tp&n circuit breaker bs# and short circuit capacity

    Morning All, Having spent many years gleaning information from you all as a non member I've finally needed to join because, try as I might, I just can't find the answer to this puzzle, so here goes. I've just installed, replaced really, a TP sub board that's being fed from a Crabtree 60A STD...
  10. D

    Installing Nest 3rd Gen

    Hi all, I just installed the Nest 3rd gen into my new house, which was a bit of a mess - everything was wired straight into the old Honeywell ST7100 without any sort of junction box. It’s a Y-plan system with a (very old) Glow Worm 35F boiler, a Honeywell V4073A1039 valve and a UnitFive pump...
  11. N

    Short Circuit When Emergency Lights Are Connected

    I've come across a fault at work. Fuse keeps blowing when they put it in. I haven't tested for a while, and so am pretty sure I'm missing some basic steps with the fault finding process. Small room. 1 emergency fluorescent light fitting, 1 bulkhead emergency fitting. Fluorescent is plugged into...
  12. Daniel Jones

    2396 style question, 2400, short circuit, RCBO,

    hello, studying for my 2396 exam and i need some help! Been banging my head against a wall for hours trying to get this one straight in my mind. The question is as follows: An electrical installation within a small retail outlet, located in a farm building is to be designed with the...
  13. L

    Short circuit calculation

    Anyone able to help on the following... Short circuit calculation & current carrying capacity of: 50x10mm2 copper busbar & 80x6mm2 copper busbar One for the brain boxes..
  14. A

    Short circuit after water damage- advice please ?

    Hi all. Advice please. Had a flood 36 ish hours ago where several tens of gallons of water came through kitchen ceiling passing over the kitchen lighting circuit. The lights (6) are ceiling inset 240 downlights, no transformers. The lights are connected in the circuit with connection blocks and...
  15. Alex-SL

    Is the IEC 60909 standard applicable for short circuit current calculations in UK?

    Hi. I would like to get a help from this forum electrical engineers. There is the international standard “IEC 60909” for calculations of symmetrical and asymmetrical short circuit currents. I need to calculate line-to-earth short circuit (circuit 0.4kV) by the software that uses calculation...
  16. J

    Water Distiller Keeps Shorting

    Hi Folks, Ive got an elderly water distiller that packed in a few weeks ago, with a suspected blown heating element (kept tripping the main fuse). Sent away for new parts, installed them and now it just blows the local fuse, accompanied by a flash and a bang. :( Ive been over it all with a...
  17. W

    Short circuit

    Sorry just learning but with a short circuit. V=i x r so dosnt that mean that the maximum short circuit in a circuit with even no resistance would be 230 Amps. How comes I hear of higher currents in faults and breaking capacity for the breakers are 6ka.
  18. Lee Gold

    Short circuit and break up cable on fault finding rig

    Can someone explain a short circuit And a break in a cable when fault finding please what is the meaning of them please. Was fault finding today on test rig
  19. P

    Rated short circuit capacity of a BS88-3 type C fuse?

    What is the rated short-circuit capacity of a BS88-3 type C fuse? They are typically manufactured to 80kA but what does the BS say?
  20. W

    MCB tripping time for 153.37A Short circuit L-N fault for 16A Type C MCB??

    I'm a qualified spark but studying building services engineering at uni and just need a little bit of advice to see if I'm going wrong. Trying to answer a question where we have a 16A Type B MCB, and a short circuit fault current of 153.37A. From fig 3.4 of regs we can see that for a fault...

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