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  1. ElectroChem

    Current Transducer Wiring

    Yes, that CT I linked is loop powered and covers the 0-5A range so suitable for your 2.5A measurement.
  2. ElectroChem

    Current Transducer Wiring

    The transducer you have indicated is not really suitable for the application you have specified. It requires a current transformer of 0-1A or 0-5A secondary current, while your primary current is only 2.5A. I would suggest something more like this if you have 24V control in your machine. LEM...
  3. ElectroChem

    Clamp meter that will measure milli amps

    @Haworth Just in case you didn't realise, David is having a bit of fun with that recommendation. Don't clamp a 771 around an AC line, it... won't appreciate it. As for AC leakage clamps, I use an AEMC model 565. It has a high range to 100A AC, low range to tens of microamps.
  4. ElectroChem

    Has anyone seen 3 phase lighting

    I've seen them, but not at commercial ratings. This fitting was a multi-kW incandescent lamp for stage lighting, 3x60A filaments in a quartz bulb a foot long.
  5. ElectroChem

    Machine wiring standards

    Thanks for the feedback gents, I'll try to address some of the queries. I seem to have misled with my phrase 'design and build the electrical controls'. We're just laying out/building the panel and wiring the machine, the program and electrical design is being done by our client's mechatronics...
  6. ElectroChem

    Machine wiring standards

    Hoping some of you industrial gentlemen can help me with an enquiry. My company (based in Sydney, Australia) has been asked to design and build the electrical controls for a CNC machine destined for European customers. The programming is being handled by our client, we're just building it. If...
  7. ElectroChem

    Does the brushed DC motor and Permanent magnet Dc motor need position feedback in the control system

    Curious to know what sort of brush/commutator lifespan you see on those? I maintain some brushed DC motors, but they are RPM tacho feedback not servos.
  8. ElectroChem

    Multimeter showing reading when nothing is plugged in

    That multimeter is dead. You could possibly replace a fuse but I'd never trust a reading from it again. The more worrying point is that you don't appear to understand why it went bang, or that sockets don't have 'amps' in them. I'd strongly suggest getting further into your course before you...
  9. ElectroChem

    3 Phase Meter - house move

    If you only want an overall usage graph then you only need one clip, on the incoming line. If you want to tell apart peak and off-peak usage, then two clips on the outgoing line(s). Only rarely would you clamp the active and neutral of an incomer separately, say if you were hunting for leakage...
  10. ElectroChem

    Contactor control circuit

    @Andy-1960 beat me to the punch, I'd be using a current sensing relay. Have its control contacts cut the contactor if your indicator lamp burns out. If you need to run a lamp in series with the coil, you'll need to very carefully balance the current & voltage ratings to give reliable operation...
  11. ElectroChem

    Armoured cat5e .................

    If you're particularly concerned then use shielded Cat6. Just remember to also use grounded jacks/plugs.
  12. ElectroChem

    Active Trainees - Show Yourselves

    I keep meaning to let the admins know I'm not a trainee anymore. Qualified last October, licensed tradesman now :)
  13. ElectroChem

    TS100 Soldering Iron

    Heard a lot of good things about this soldering iron. Thinking of making up an adapter to run one off my 18V batteries, convenient for field soldering of plugs.
  14. ElectroChem

    Why are the Planets almost round?

    @rsgaz has it essentially right. Any planet/planetoid of larger diameter than ~1000km (IIRC) will form a roughly spherical shape as its own weight is enough to overcome the rigidity of rock/iron-nickel so it 'squidges' together. @telectrix The earth is jagged to our perception, but in terms...
  15. ElectroChem

    3 phase immersion heaters in star (no N) or delta

    @Rob Very interesting setup, took me a bit to wrap my head around how a cascading failure would work there. With the potential for run away burnout, running a neutral to the star point would start to look attractive.
  16. ElectroChem

    3 phase immersion heaters in star (no N) or delta

    @Rob you keep mentioning the other 2 elements blowing if one goes open circuit. Won't a 2-wire load through two elements in series give 200V across each? No reason a resistive load would be damaged there. I can see monitoring for element loss as the power would be halved so you'd lose heat though.
  17. ElectroChem

    Simple question about installing motion sensor

    Indeed, otherwise you would turn the light on at the switch then the sensor would turn it off! I can think of no reason why you would put a PIR in a 2-way switching arrangement, but I'm just a poor industrial controls boy, the mysteries of houses are beyond me.
  18. ElectroChem

    Simple question about installing motion sensor

    Even then, you couldn't just whack in a sensor in place of a 2-way switch, or any time you actuated the physical switch you'd reverse the contact polarity of the sensor. The circuit needs to be rewired to a parallel double switched I would think.
  19. ElectroChem

    Help with maths please (scientific notation)

    Get yourself one of these mate, you'll find the display makes calculations like these much easier to enter.
  20. ElectroChem

    Single to 3 phase converter

    22kW was off my head with no working. Looked it up and an 18kW 415V motor at 0.8pf pulls ~32A FLC, as stated in the OP. To power that same 18kW off a single phase supply is 97A before conversion losses! I don't know where he got 37.8A startup from, a heavy traction lift motor is more likely to...

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