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Type: Posts; User: fifty60

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  1. Replies
    8$$
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    209

    How Hi FLA on a 20A breaker

    I have some equipment that will hopefully become UL listed. Will UL hold me to the 80% of the CB rule when it comes to equipment that is powered from a standard 20A wall outlet? I am currently at...
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    3$$
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    115

    Very helpful, thanks, it makes sense.

    Very helpful, thanks, it makes sense.
  3. What color does the IEC mandate for 24VDC wire?

    What color does the IEC mandate for 24VDC wire? The best I can come up with in my research is brown and grey. But using Brown for line and also for 24VDC control wire can't be right...is it?
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    Agilent Gain/Offset for Pressure Transducer

    I have a couple Kavlico P528 pressure transducers that I am trying to observe with Agilent data logger using BenchLink 3.

    The P528 has a pressure measuring range of 0 to 400 PSIA. The Nominal...
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    Uninsulated Live Components Per UL508A

    Should I consider terminals as "uninsulated live components" if the components themselves are fully insulated?

    I am concerned about 21.2.1 regarding ventilation openings requiring a hood if they...
  6. Thread: EMC Testing

    by fifty60
    Replies
    6$$
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    170

    I currently use 14AWG MTW wiring. Would there be...

    I currently use 14AWG MTW wiring. Would there be any benefit in switching to a 14/2 twisted and shielded cable for the inputs of my electronic components, for example, my PID controllers, HMI,...
  7. Thread: EMC Testing

    by fifty60
    Replies
    6$$
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    170

    It is the constant average peak values that are...

    It is the constant average peak values that are failing. The conducted emissions would come from the input of my power supplies right? For example, I have a 110V to 24VDC power supply. The 110V...
  8. Thread: EMC Testing

    by fifty60
    Replies
    6$$
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    170

    GoldDigger, it is not the compressor that is...

    GoldDigger, it is not the compressor that is cycling, but the relays control the refrigerant flow to the compressors.

    I am failing at 438kHz and 514.5Khz. This could only be a power supply right?...
  9. Thread: EMC Testing

    by fifty60
    Replies
    6$$
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    170

    EMC Testing

    I have a device that is failing conducted emissions. At this time, an input filter is the remedy. This equipment consists of motors, fridge compressors, heaters, solenoids, electrical-mechanical...
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    138

    IEC COLOR CODE FOR DC CONTROL WIRES

    Anyone know what the IEC color code is for ungrounded DC (24V) control wiring? NFPA 79 calls out blue for such wires, but I am not able to discern what the IEC wants to use. Is it brown and grey? ...
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    Open Nichrome Heaters in a Humid Environment

    I have nichrome heaters that can range from single elements that operate a 2kw up to 20KW using multiple elements. The humidity in this environment is controlled, and can range from 1% all the way...
  12. Ah, the aluminum version is not listed there. It...

    Ah, the aluminum version is not listed there. It is the aluminum version of the NBAE.
  13. It is UL48 A/B. I know where the equipment...

    It is UL48 A/B. I know where the equipment grounding conductor actually lands needs to be UL467. Here is a link to the Ilsco neutral bar I am looking at:
    ...
  14. UL508A Question "Is a neutral bar considered a bus bar?"

    Section 29 discusses "Internal Wiring" 29.1.1 states that "All internal wiring conductors or bus bars shall be made of copper." If I have a neutral bar, which all conductive parts that could...
  15. I believe this would be a good situation to use a...

    I believe this would be a good situation to use a GFCI receptacle...
  16. Thread: Largest Motor

    by fifty60
    Replies
    5$$
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    309

    Excellent, thanks everyone for the discussion.

    Excellent, thanks everyone for the discussion.
  17. Thread: Largest Motor

    by fifty60
    Replies
    5$$
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    309

    Largest Motor

    I need to specify the largest motor in my system. I have a 3 phase 230V refrigeration compressor that is 1.5HP with an RLA of 4.9A. This is my largest HP motor.

    I also have a single phase fan...
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    2$$
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    280

    Pull Box or Junction Box

    Would this be a junction box or a pull box? Can I use a pull box interchangeably with a junction box if my wiring is smaller than #4AWG?

    I am wanting to mount a small 16A non fused disconnect...
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    2$$
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    228

    ARCING AT HIGH ALTITUDE

    Can anyone explain how dielectric breakdown is affected by high altitudes?
  20. Thanks for the explanation(s).

    Thanks for the explanation(s).
  21. Shorting (with copper) the inputs of a T/C Module

    Can anyone explain why a temperature controller reads around 25 C when you take a piece of copper wire and short out the + and - T/C inputs?
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    Locating a Disconnect inside a Hoffman Box

    I would like to install a 240V 60A rotary switch disconnect inside of a Hoffman enclosure. My equipment consists of refrigeration compressors, heaters, blowers, a transformer, and control...
  23. After looking at article 100 again, I agree with...

    After looking at article 100 again, I agree with you Charlie B. Thanks for the help.
  24. Equipment load, or branches within equipment?

    I know working backwards from the load until I see the first disconnect device is my Branch Circuit. But what about the branch loads within the equipment?

    For example, I have two refrigeration...
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    Insulation on MTW or THHN/THWN Wires

    If my wire is rated for 600V, would this be considered its line to neutral rating? Or would it be the line to line rating?
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