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  1. Thanks for the explanation(s).

    Thanks for the explanation(s).
  2. 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...
  4. 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.
  5. 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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    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
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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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    I have been researching conduit in general, and...

    I have been researching conduit in general, and have now familiarized myself with MC and Flex cables. I believe that due to the inherent vibration of the equipment, that this will be the most likely...
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    This type of strain relief is wall mountable...

    This type of strain relief is wall mountable right? And the NPT threaded fitting on the back would be used to attach a conduit to?

    11189
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    Right now I just have an opening on the top of...

    Right now I just have an opening on the top of the equipment. The GC who installs the equipment will be required to supply the strain relief for the power connection. If cable (SOOW for example) is...
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    This equipment does not want to run cable, it...

    This equipment does not want to run cable, it only wants the individual conductors. If it were cable, the solution would be to get a strain relief fitting. With the individual conductors, I would...
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    The distribution blocks are available immediately...

    The distribution blocks are available immediately after the conductors enter the equipment. The conductors are not "flying around" as I had originally though, they run less than a foot and land in...
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    Air Tight Thermocouple Jacks/Plugs

    I have used these Omega thermocouple jacks and plugs in the past. I am looking for something similar now, but they will need to be as close to air tight as possible. With these connectors, whenever...
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    The grommet protection at the power conductor...

    The grommet protection at the power conductor entry point is for abrasion protection only, and does not supply any strain relief. The power conductors then are ran open inside the equipment until...
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    Sorry, it is not 8/3 cable, but actually...

    Sorry, it is not 8/3 cable, but actually THHN/THHW wires outside of a jacket. The NEC table is actually 310.15(b)(16) (formerly 310.16) using the 2011 NEC.

    The sub panel is located on the front...
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    They are sized from table 310.15(b)15...so I...

    They are sized from table 310.15(b)15...so I THHW/THHN..
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    Do I Need Conduit?

    I have 8/3 cable that is carrying 208V and 35A. For most of the equipment I work with, this would be ran inside a 1 1/4" emt until it reaches the equipment sub panel. The equipment I am seeing now...
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    Transformer Question (450.3(B))

    I have a transformer that draws more than 9 amps on the primary. When I reference 450.3(B) to size the primary protection, when primary and secondary protection are present, I see that I can size...
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    Resolution using PT100 RTD

    I am trying to determine the resolution of my temperature controller. My sensor is a PT100 RTD. The temperature range for the controller using the RTD is -210 to 700. The ADC on my temperature...
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