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operating

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  1. W

    Multiple Floodlights - Operating Strategy ??

    I've had a customer today asking for 5 floodlights to be fitted around his property. He wants every light to be equipt with a PIR sensor and all lamps to be linked. This means that if any of the 5 PIR's detect movement, they will then operate all of the 5 floodlamps.Assuming that the (L1)...
  2. La Poste

    Fly builders operating limited companies

    I don't know where to put this thread so I shall put it here. My Electric boss has been ripped off three times in the last year and at the moment I am wiring up a very large garage for my friend. My friend has had extensive building work done with a lot of problems not yet fixed by the builder...
  3. T

    Floodlight PIR operating problem... Help appreciated.

    Hey guys, I've recently come across an interesting fault that has me a little stumped, so thought i'd open it up for the forum and hear some of your suggestions as to possible causes. I was called to a job in a rural area that i believe used to be a farm and has now been converted into...
  4. L

    RCBO True operating current 30mA????

    Called to investigate a fault in a building which has lighting on TYPE B RCBO's, ive stripped everything and all the wiring is good >800Meg everywhere as its less than a year old, the switchgear is Eaton Mem and the accessories are the cheapest nastiest youve seen, the main lights are twin 9w...
  5. D

    Minimum start voltage & operating voltage

    My latest customer asked me a goodun: He noticed from the SMA SB2500HF installation manual that its "startup voltage (adjustable)" was 220V but the "minimum voltage" was 175V. His question was why not make the startup voltage as low as possible so the inverter kicks in earlier.. I promised...
  6. silver surfer

    RCBO operating times

    Testing a job yesterday and realised a couple of things, during the RCBO 1n and 5n tests in a lot of cases the 5n value was actually slightly higher than the 1n value,eg 1n=28.2ms 5n=28.7ms (?). Doesnt seem right that multiplying the test current x5 would have a slower tripping time (although...
  7. B

    Safe operating temperatures XLPE 90 degree vs table 4D4A for connected accessories

    Have been concerned about an install thats running on the warm side. MCCB is rated at 200 250A supply cable is supposed to be 95mm swa (4 Core) which surprises me looks more like 70mm at best 50mm worst. Nothing on the side wall (Darn those manufacturers) Now the MCCB has a design operating...
  8. L

    where to find the protective device operating current (I2) in 7671???

    does anyone know where in the bs:7671, you can find the protective device operating current (I2) ? Ive been looking for quite some time now, and i'm getting rather fustrated, because I cant find it? cheers luke

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