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  1. Thread: EMC Testing

    by fifty60
    Replies
    3$$
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    60

    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?...
  2. Thread: EMC Testing

    by fifty60
    Replies
    3$$
    Views
    60

    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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    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? ...
  4. 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...
  5. 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.
  6. 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:
    ...
  7. 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...
  8. I believe this would be a good situation to use a...

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

    by fifty60
    Replies
    5$$
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    284

    Excellent, thanks everyone for the discussion.

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

    by fifty60
    Replies
    5$$
    Views
    284

    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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    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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    ARCING AT HIGH ALTITUDE

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

    Thanks for the explanation(s).
  14. 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?
  15. Replies
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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...
  16. 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.
  17. 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...
  18. Replies
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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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    Sizing Transformer For Solenoids

    I have several 115V solenoids that I need to supply from a 460V source. I will use a general purpose transformer to step down the voltage to the solenoids. The solenoids have a 180A inrush, with a...
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    460V-480V

    460V-480V
  21. Replies
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    Circuit Breaker Labels

    I make circuit breaker labels to affix to equipment before they are shipped to the customer. I have an odd piece of equipment here that has a refrigeration compressor and an air circulator fan. ...
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    Single Phase VS Three Phase Transformer

    I can recommend the selection of a single phase remote refrigeration compressor power pack, or a three phase version. The single phase has voltage requirement of 208-230V at an RLA of 6.3A and the...
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    If you new that you had to run 8/4 (3 current...

    If you new that you had to run 8/4 (3 current carrying plus one ground wire) AC, MC, or flex cable to a piece of equipment, white size cutout would you want to see?

    No cutout is not an option. I...
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    No, the equipment will be supplied without the...

    No, the equipment will be supplied without the power chord. The installer has the option of using a chord and plug, or making it permenantly connected to a disconnect. If it is permanently...
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    Can the fitting that connects the MC Cable to the...

    Can the fitting that connects the MC Cable to the equipment enclosure be considered strain relief? Does it actually provide any strain relief?
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