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  1. Thanks for the response. So inside of equipment,...

    Thanks for the response. So inside of equipment, per NFPA 79 that would not be applicable?
  2. When determining the which column to use in the...

    When determining the which column to use in the wire ampacity charts (310.15 NFPA 70 and 12.5.1 NFPA 79), do I only look at the insulation rating on the wiring itself? Or, am I looking at the...
  3. Does the much higher rating for NFPA 79 recognize...

    Does the much higher rating for NFPA 79 recognize that the MTW wiring will be used inside of a machine and not inside of a house like NFPA 70?
  4. Interesting point...I don't think it is either...

    Interesting point...I don't think it is either actually....it is all internal wiring on "laboratory" equipment....it is close to NFPA 79...definitely not NFPA 70 inside the equipment...
  5. I generally use NFPA 70 table 310.16 to size my...

    I generally use NFPA 70 table 310.16 to size my wire (75 C column). For 10AWG, this says the ampacity is 35A. When I look at the manufacturers data sheets for the 10AWG MTW wire I am using, the...
  6. Refrigeration Compressor Min Wire Ampacity and MAX OCPD

    Is it really common to see the ampacity of the wire on refrigeration compressors not match the OCPD on the compressor branch circuit. I just can't get used to sizing the wire at 125% of the RLA, and...
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    Very helpful, thanks everyone. I will not trust...

    Very helpful, thanks everyone. I will not trust any charts unless I do my own calculations.

    The 40% is not for thermal considerations, but spatial. Is this only because problems arise when you...
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    Conduit Fill Charts

    When I reference "conduit fill charts NEC" on google, the first 10 charts that populate all differ from the informative annex C in NFPA 70 2014. For example, 1/2 EMT per NFPA70 annex C table C.1 I...
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    The 2nd screen does not need to be a touchscreen....

    The 2nd screen does not need to be a touchscreen. i would like to do a do a Pi running windows 10 (the heavens open), and then run that to a seperate display...but I'm not sure about putting...
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    Custom Touchscreen--Modbus RTU

    I have a touchscreen/plc combination that I normally use on standard equipment. The touchscreen/plc are designed by a separate company, and we purchase them as a unit.

    I would like to add a...
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    Thanks. This was all very helpful. If I run...

    Thanks. This was all very helpful. If I run into any problems this winter, I will look more at insulating the outside of the enclosure and less at covering the vents. Thanks!
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    Thanks for the suggestions. It has the vents...

    Thanks for the suggestions.

    It has the vents for ventilation in the summer time, but it also has a heater to keep the inside of the enclosure above freezing in the winter time.

    The entire...
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    Nice. I never heard of that material before. I...

    Nice. I never heard of that material before. I found some here http://www.magnetsource.com/Solutions_Pages/zipsheet.html

    I wonder how malleable it is? Do you think it is maleable enough to seal...
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    Covering Vents on Hoffman Enclosure

    I have a Hoffman Enclosure that has forced ventilation vents. The vent for the intake is located on the side (width) bottom of the box. The exhaust vent is located at the top (width) side of the...
  15. It would be a bad idea then to simply raise the...

    It would be a bad idea then to simply raise the temperature without removing the moisture? Raising the temperature will simply mask the problem, but in actuality is making the problem incrementally...
  16. What is going to happen to the moisture after I...

    What is going to happen to the moisture after I warm the air. I know that warming the air will make the relative humidity (RH) go down since the warmer air can physically hold more air, but will I...
  17. The storage temp for the PLC is -40F, but the...

    The storage temp for the PLC is -40F, but the operating temp is 32 F. It is not supposed to be frozen before at the moment it is powered...

    This is a new installation. No problems yet, but it is...
  18. A cabinet cooler would have been ideal, but at...

    A cabinet cooler would have been ideal, but at this point I just have the ventilation fans and heaters. So I am hoping to make the hygrotherm work.

    With the above scheme, and I think this what...
  19. I am limited with what I can do at this point......

    I am limited with what I can do at this point...

    I can still add a din mounted electronic hygrotherm. This can turn on my heater at below 45 F or above 50% RH. The heater itself is made by...
  20. My concern with adding a humidistat and having...

    My concern with adding a humidistat and having the heaters on above 50% RH is that I would potentially overheat the electrical enclosure.

    How effective will the forced ventilation fan be at...
  21. The 50"X50"X10" electrical enclosure is inside of...

    The 50"X50"X10" electrical enclosure is inside of larger enclosure. There are no RH producers inside of the larger enclosure. The PLC is a 10+ year old design, so I am sure it has electrolytic...
  22. Forced Ventilation and Heater in Same Enclosure

    I have an approximately 50x50x10 Hoffman enclosure that already has a fan and vent for forced ventilation. I would like to add a heater for condensation control in the summer and to keepa PLC from...
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    Why no internal overloads on 3 phase Motors?

    Most single phase motors come with internal overloads, but most 3 phase motors do not. Why is this? Is it because the overload is more complicated for 3 phase to avoid single phasing the motor?
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    MINI DIN 8P Pinout

    I am trying to find out the pin designations for a mini din8p RS232 cable. I need to find the TX, RX, DCD, DSR, CTS and GND. I know the pin, looking at the male side, count 1 through 8 starting...
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    Determining Auto-Ignition Temperature

    I am trying to find the AIT's for diesel, indolene, heptane, and any fuels with ethanol and methanol. What is the official source to get the AIT's from?

    I can find Heptane, but no luck with...
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