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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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    EQUIPMENT GROUNDING CONDUCTOR

    I have equipment that is sometimes provided with a safety switch disconnect located on the equipment, and sometimes this disconnect is located external to the equipment.

    If the disconnect is...
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    Metric Sizes for EMT

    I have 1 1/4" EMT that I need to convert to the equivalent metric size. I am finding that 35mm is the equivalent metric size, but I did not know if that is an exact measurement or an approximation. ...
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    So my primary to secondary ratio is 575/230= 2.5....

    So my primary to secondary ratio is 575/230= 2.5. So if my load is drawing 6A, would I then make my contribution to the equipment fla 6/2.5 = 2.4A?
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    My question can be summed up as follows: I have...

    My question can be summed up as follows: I have a branch circuit inside of my equipment that consists of a 3KVA transformer. The 3KVA transformer has 2 motors across its secondary. Is it...
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    GoldDigger, the rated HP of the compressors will...

    GoldDigger, the rated HP of the compressors will decrease with the decrease in Voltage and frequency.
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    Jreaf, thanks for the help. I was mistaken...

    Jreaf, thanks for the help. I was mistaken however, there are only two 1HP 3-phase motors. I do not have the motor specs in front of me, but the amps * voltage of each motor came out to...
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    Transformer Sized for Load?

    I am having to add a transformer to a piece of equipment. The transformer is 3KVA, and will take 575V down to 230V. I will be powering three 1HP motors on the secondary. When I size the disconnect...
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    The compressors have an RLA. The RLA is for...

    The compressors have an RLA. The RLA is for 380/460. There is a + or - 10% voltage tolerance on the RLA rating. As long as my operational voltage is within the + or - 10% of the rated compressor...
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    Circuit Size for 380/400/415/460/480V

    I am trying to size the circuit for equipment that consists of compressors, heaters, and a transformer. I am trying to prove that what I see at 480V will be my worst case current draw due to the...
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