fault

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  1. Vortigern

    Bit of a mystery to me, any ideas? Fault on three phase Merlin Gerin

    Outage of main three phase primary switch box for one of three buildings on commercial site. The building houses around 30 commercial units. Switched back on the main switch, power restored. Except for one unit. All units supplied through the secondary sub switch box. Large MCCB MEM type. Three...
  2. gazdkw82

    Strange fault

    Installed some new floodlights/pir and switches today. All tested fine, however on power up it was evident I had got something wrong. Upon investigation I had the neutral in the switched live of the PIR. Kicked myself but mistakes happen. Corrected the mistake but still nothing was working as...
  3. A

    Very strange car fault - Citroen C2 - fuse box? BSI? BSM? Please help

    Hello everyone. I'm getting a bit desperate, as my car has been at mechanics 3 times already and nothing really helped. Here is the problem: My 2009 Citroen C2 has an electrical/electronic fault which no one can find so far. The car sometimes starts with no issues whatsoever, and sometimes...
  4. G

    Installed a new C/U now have fault

    New here so sorry if posted in wrong place, I have installed a new consumer unit as the title says it’s a split load rcd board, anyway to the point one of the rings seems to now have a neutral fault which is taking out one side of the board I have checked all obvious things, touched no...
  5. J

    New to the forum, trying to learn about neutral-earth fault troubleshooting!

    Qualified in electronics, only did electrical work as a DIY, now retired and enjoying life. Except when the RCD trips for no obvious reason... Cheers Jez
  6. D

    Lighting Fault - mystery 3 core

    I am a relative newbie so excuse me if this might be obvious... I am trying to find a fault with the lighting in one room. Apparently, the light was very dim before the client had disconnected it. There is a 3 core in the light switch which when tested supplies about 150V. There isn't another...
  7. littlespark

    Strange fault. Time delayed mcb trip.

    Fault finding. Good to systematically and logically investigate the problem, then the culprit has been staring you in the face... phone call from new customer- no power. get there, split rcd board. “It’s that big switch that won’t stay up”, says the woman Ok, the rcd. Unplugged everything I...
  8. M

    RCD/RCBOs DC Fault

    Evening all, after a bit of advise or reference to look towards. We protect our installations with RCD/RCBOs to protect against earth faults and stop people getting zapped. However with smart homes on the rise, and most houses now having LED lighting, plus USB sockets. The RCD/RCBOs we...
  9. B

    N/E fault RCD not tripping ??

    Hi all can anyone give me the logic why the RCD wouldn’t trip on a neutral/earth fault. Testing a extension where they have added in 5 additional sockets to the upstairs ring had been powered up and nothing tripping with household appliances plugged in and working. Carrying out IR tests to...
  10. newfutile

    Prospective fault current

    During a recent inspection on a 3 phase board I have some MCBs rated at 6KA And some rated at 10 KA . The ZE is about 0.04 to 0.05 depending on phase , form my calculations this works out to 9.95 KA ( I can only measure single phase pfc) On a consumer unit we allow 16KA if its backed up by a...
  11. A

    DS3 Brake light fault

    Hi guys, Got a Citroen DS3 with a rather strange fault. The tail light brake lights (Left and right) never work with the brake pedal, however the actual bulbs are fine because they light up when the lights are switched on (but the brake light always stay on). Checked the brake switch and it...
  12. C

    Unusual Accenta G4 Honeywell Fault- Keypad

    Hi All, We have had an Acenta G4 alarm fitted for 5 years. It has been fine until recently, however the keypad now appears to have failed. There are PIRS sensors, a door sensor and an alarm box with LEDs/siren. On the keypad, the 2 LED lights are not illuminated. The keypad does not work...
  13. W

    Fault finding advice

    Any fault finding advice It’s always been said to clients to unplug everything if a fault on socket circuits but can you Turn off counter top fused spurs for e.g washing machine instead of the hassle to get to the back of plugs. So I’m asking are fused spurs double pole. Also the same question...
  14. T

    Fault finding in the am2

    Hi I have my fault finding resit in a couple of weeks. the 3 possible faults are-open circuit short circuit and high resistance how would I test for each of the above faults and what sort of resolute am I looking for on the tester The test instruments I have is a low ohm continuity tester...
  15. M

    UK AM2 Fault Finding

    Hello everyone, I have my AM2 fault finding resit on Friday and just wondering if anyone has any top tips as I don’t get to do any fault finding at work? In the AM2 you get 7 faults which can be on these circuits: 1 usually on a data circuit 2 on earth bonding to extraneous parts water pipe and...
  16. T

    RCBO Fault

    Hi, Anyone have experience in the following: 16a MK RCBO Tripped supplying Garage. 2 Circuits. Radial and Lights (6/16) MCB's PME supply. Garage supplied in 6mm Twin and Earth with the Earth connected at the Main DB and Connector Blocked in the garage (doing nothing). Earth rod to garage in...
  17. P

    Low resistance fault replicated on a made up rig

    Possibly a daft one this lads but any insight welcome. Have set a dummy rig up at home and am trying to replicate a low resistance fault on a ring main. No prob getting off scale high and zero readings but anyone think of a way of creating a low but not zero reading.
  18. N

    Fire Alarm- Earth Fault on Loop (XP95)

    Hello, Would welcome any advice- We have an earth fault to a fire alarm loop, everything connected is XP95 and there are isolators in many bases and call points.. Is there a hints/tips way to find this, without having to gain access everywhere. Would splitting the loop, powering the half that...
  19. R

    Toyota Camry - intriguing fault with headlights

    2005 Camry. Yesterday the headlights started to play up with an interesting issue. When the ignition is on + the light switch on the steering is on, the low beams do not light up. However when the high beams are turned on, both the high and low lights are on. All or nothing it seems. I thought...
  20. h.abrar94

    How to calculate the resistance of steel armour under fault conditions 70 oC for CSA 95mm2

    Hi All, hope your all well. I was hoping if I can please get some advice in regards to SWA. In Particular using SWA as CPC. Cable size 95mm2 I have a table for SWA which shows various information, in the last two columns it shows the "resistance of steel armour under fault conditions at 70...

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