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Recent content by MakeItSpin

  1. MakeItSpin

    Micrologix 1100 Memory Module

    Thank you for the link. The complete answer is there. I find the Rockwell site rather impenetrable and wasn't able to find that on my phone out here in 3g land.
  2. MakeItSpin

    Micrologix 1100 Memory Module

    Of course it is. But they're not answering the phone on a Sunday. My apologies.
  3. MakeItSpin

    Micrologix 1100 Memory Module

    I have a dead Micrologix 1100 that has a memory module installed. Will a new identical processor work by just swapping out the module or does the new one have to be configured first? IP, configuration, etc?
  4. MakeItSpin

    motors sharing common load

    Belt tension is critical. One set of belts a few thousandths deeper in the grooves will cause that motor to run faster and draw less current than the other motor. Once V-belts are stretched and broken in it's less of a problem if the mounting is solid. This application is common in the crusher...
  5. MakeItSpin

    Cable Heating From Using Steel Conduit Elbows?

    I had an experience with this phenomenon years ago at the beginning of my career. We were sent out to wire a large submersible well pump, something along the lines of 200hp. When we got to the site there were three individual conductors stubbed out of 3-1" threaded hubs on the top of the...
  6. MakeItSpin

    Arc Flash/Resistant

    70E says at certain energy levels operating a metal clad switch over 1kV with the enclosure doors closed requires Category 2 PPE. I don't believe that 70E addresses "arc resistant" gear, any 70E experts care to comment?
  7. MakeItSpin

    Is a ground rod needed for industrial machinery?

    skogsgurra makes some good points. I might also add that NEC requires "any" power source to a machine have it's own equipment ground. Example would be a machine that has a 480v 3 phase supply plus a 120v circuit for an immersion heater, controls, etc. Don't confuse bonding the grounding...
  8. MakeItSpin

    MCC Bucket Failure - Electrical Fault

    milwaukeebob: If I understand correctly what you're asking : It is common to see large (Size 5 and up) contactor coils operating at primary voltage (480) using the 120 volt coil relay as a dry contact. I took a current reading on a Size 5 120 volt contactor once and saw 7 amps. That's a big...
  9. MakeItSpin

    Conduit

    peebee, I'm sure you looked in these three articles, but; 358.12(5)states EMT can't support luminaires (fixtures). I don't see anything prohibiting IMC or RMC in 342 or 344. I chased 310.11(B)(3) to 314.23(F)exceptions and thought I had it until I got to exception(d), 12" maximum dimension in...
  10. MakeItSpin

    Conduit

    You can't use EMT to support fixtures. I'm not aware of the same restriction on RMC or IMC, that's why I asked you what you were using.
  11. MakeItSpin

    Conduit

    What type of conduit are you using?
  12. MakeItSpin

    High Leg on Delta-Delta Transformer causing problems

    Does the main breaker for the area that is tripping have a Ground Fault trip unit? If so it is likely to trip at lower fault levels to ground than the breakers downstream of it.
  13. MakeItSpin

    Detecting lost phase with current monitoring.

    http://www.symcominc.com/ has 3 phase current sensing models.
  14. MakeItSpin

    Motor Branch Circuit Conductors

    Time rated motors are common on cranes and hoists.
  15. MakeItSpin

    Industrial (NFPA79) Flexible Utility (Electric) Drops

    This is a great question. Here's how I see your problem, ignoring the fact you're using a lighting circuit. That fact might not be a violation of NEC, I'm not sure, but if your machine faults you take the chance of losing lighting in the area. The main issue with the NEC that jumps out at me...
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