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  1. A

    Indoor split unit AC got burned

    Thank you. you are right. but this is a small wall mounted indoor unit and not too old. I doubt it would have collected alot of dust but you have a valid point
  2. A

    Indoor split unit AC got burned

    Thank you. how do you think filters could cause fire?
  3. A

    Indoor split unit AC got burned

    the unit was being services only for mechanical parts not electrical. I ma just trying to find out what could be the reason and how it can be avoided on other units
  4. A

    Indoor split unit AC got burned

    Dear All, I was called to a villa following a fire incident had happened. the Indoor AC, wall mounted split unit was partially melted and had caused fire in the room over night. the indoor unit was fed through the outdoor unit and not a separate socket. The outdoor unit feeder on the DB has MCB...
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    Both RCDS Tripping

    Hello everyone, I am facing a similar problem in a bigger scale. we were told by a facility management in a building that (sometimes), 3 RCDs, on 3 different DBs trip at the same time! ( Normal ground floor DB, emergency DB in GF, Emergency DB in basement). then they switch them back on and...
  6. A

    Testing bus bars

    Good morning everyone, Is testing bus bars part of fixed wiring test? if yes, how do we test them? for example, shall we check the connections on both sides? continuity test or torque test,..etc? ( in my project, it is running from LV panel to floor main DB)
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    Testing high level lighting circuits

    true. had a thought of connecting the lead to the main Earth bar in the panel ( while all CPCs are connected) and go and test every GI box ( behind light switches) and not go to the lights but I guess that is not fulfilling the purpose to measure each circuit resistance. trying to find a way to...
  8. A

    IR testing on power cables

    Good morning, to carry out IR testing for armoured power cables in man panels ( pls see below image), do you remove the cable from circuit breakers on both ends or we can test them as it is?( by putting the probes on the cable lug or circuit breaker screw, depends the type of connection)
  9. A

    Testing high level lighting circuits

    HI again, what do you think of testing high level lights only by R2 testing and not R1+R2? Thank you in advance for your feedback
  10. A

    Testing high level lighting circuits

    Hundreds of lights. they are installed on gypsom board. unfortunately do not have any photo
  11. A

    Testing high level lighting circuits

    Thank you so much for your reply and advice. Yes, the consultant requires an inspection by a 3rd party but contractor has delayed it till now to try to get away with that as this is additional expense for them. Having all the lights being installed ( and they are all LED), makes the work more...
  12. A

    Testing high level lighting circuits

    Good morning everyone, I have been asked to do the initial verification on a newly completed building. so all the light fittings have been installed, false ceilings have been closed off,..etc. what is your suggestion for testing the lighting circuits?( continuity, IR tests) some of them are at...
  13. A

    couple of PAT testing questions

    Thank you so much . very helpful
  14. A

    couple of PAT testing questions

    Thank you guys for very informative replies. really appreciate it. I have seen that some testers do ‘ Protective Conductor Current Test’ and ‘ Touch Current Test’ as well in which the tester shall be plugged to 230 V supply. Are these tests part of general PAT routine or this is something extra...
  15. A

    couple of PAT testing questions

    Hi Everyone, I have recently bought a UNI-T PAT tester ( UT528) and have few questions: It is mentioned in the handbook, to limit the earth continuity test for some appliances such as TV between 20 and 200 mA. When I check the UNI-T operation manual, it is mentioned the test current for earth...
  16. A

    Earth Fault Loop Impedance Test for lighting circuits

    I agree but the purpose of testing Zs on lighting point and checking the values with Zs of protection device ( MCB in our case) is useless because the RCD will detect and remove the earth fault much quicker than MCB. Means even if the Zs value is higher than values mentioned in the BS7671 Table...
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    sharing one MCCB for 2 loads

    True. Isolation of each DB from source was what I was thinking as well.
  18. A

    sharing one MCCB for 2 loads

    Happy new year everyone! During one my my inspections in an existing warehouse, I saw their electrician has pulled a wire from the incomer side of an existing panel ( panel A, 3 pole isolator as an incomer), to feed another e phase panel(panel B). The upstream breaker is an MCCB ( in panel C)...
  19. A

    Zs values when there is additional RCD protection

    I guess we can ask this question for all protective devices. plus, testing RCD is one of the testing procedures that we do as per BS7671 during routine checks and periodic inspections. I guess by having the RCD, even if the Zs values are slightly higher, everything is still protected by good margin.
  20. A

    Zs values when there is additional RCD protection

    Thank you. Dont see the problem on relying on the RCD though but you are right, as per regulation, it shall be used as additional protection.

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