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  1. Replies
    14$$
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    441

    Thanks for reminding me of that. For a typical...

    Thanks for reminding me of that. For a typical wall outlet, that has 1 line at approximately 110V to a ground reference, and the other line at approximately 0V to ground reference, is it technically...
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    14$$
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    441

    So can a true technical Neutral only exist in a 3...

    So can a true technical Neutral only exist in a 3 wire system, as the 4th grounded conductor?
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    14$$
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    441

    Phase to Neutral 110V

    I understand that the 110V that enters an American household is actually half of a single 220V phase. The 110V is derived from the grounded center tap of a transformer before it enters the home. Is...
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    14$$
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    313

    I believe it reads or as well. The motor does...

    I believe it reads or as well. The motor does not have an internal overload, I am not sure why.
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    14$$
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    313

    I have it mostly figured out except for the fact...

    I have it mostly figured out except for the fact that it is a 1.25 service factor motor, which allows 125% rounded down, but its temperature rise is above 40 C, so I would have to go to 1.15%. Is...
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    14$$
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    313

    It is an automatic start motor. It will be an...

    It is an automatic start motor. It will be an air circulator motor inside of a refrigeration/oven chamber. Refrigeration equipment itself is not a general purpose equipement. Would the motor...
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    14$$
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    313

    430.32(1) says "Motors with a marked temperature...

    430.32(1) says "Motors with a marked temperature rise 40 C or less 125%". I would get this information from the insulation rating right? In this case it is Class F insulation. The temperature...
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    14$$
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    313

    So a dual element fuse or a thermal magnetic...

    So a dual element fuse or a thermal magnetic breaker would qualify, even though it would be serving the dual purpose of short circuit protection and overload protection?
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    14$$
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    313

    I've read through section III of article 430 (NEC...

    I've read through section III of article 430 (NEC 2011) and do not see the exception that allows you to use a single thermal-magnetic breaker or dual element fuse as short circuit AND overload...
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    14$$
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    313

    I seem to remember reading that a single thermal...

    I seem to remember reading that a single thermal magnetic circuit breaker could be used in place of the short circuit OCPD and separate overload....
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    14$$
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    313

    Overloads for Motors

    Is it a requirement that motors have overloads? I understand why motors have overloads. The branch OCPD is only providing short circuit protection, and without it there is absolutely no overload...
  12. Thread: BX Connector

    by fifty60
    Replies
    9$$
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    362

    I am trying to comply with a standard (IEC-61010)...

    I am trying to comply with a standard (IEC-61010) and it states:

    "A compression bushing shall not be used as a cord anchorage unless it is suitable for use with the MAINS supply cord supplied...
  13. Thread: BX Connector

    by fifty60
    Replies
    9$$
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    362

    BX Connector

    Are BX connectors considered compression bushings?
  14. Replies
    19$$
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    479

    I am getting the 50mm^2 from the attached chart. ...

    I am getting the 50mm^2 from the attached chart. This is giving me the cross sectional area (47mm^2), which is much different than the 171.6mm^2 given in table 5. Anyone know why this is?
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    19$$
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    479

    This is what is confusing me. I have 4...

    This is what is confusing me. I have 4 conductors that are each 50mm^2. I times this by 4 and get 200mm^2. I refer to table 4 in chapter 9 and see that for over 2 wires, 40 % fill, 1 1/4 conduit...
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    19$$
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    479

    Sizing Conduit---Metric

    I normally have four #1AWG THHW conductors that I run through 1 1/4" EMT. I would like to size this to the equivalent metric. The closest standard metric size to #1AWG is 50mm^2. Four 50mm^2 wires...
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    58$$
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    1,926

    I have an intrinsically safe RH...

    I have an intrinsically safe RH transmitter/sensor. The transmitter will be installed in the unclassified location and the RH sensor will be installed in the Class I Div II location. It would not...
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    3$$
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    177

    Would the resistance method work for measuring...

    Would the resistance method work for measuring transformer winding temperature? The transformer is a small 1KVA industrial control transformer. Can I use a standard issue fluke multimeter?
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    3$$
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    177

    Derating Transformers

    I have a transformer that is rated for an ambient of 40 C. My ambient is getting to about 46 C. I am not using the full capacity of the transformer. Since I am not operating the transformer at...
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    14$$
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    414

    The Appleton cable gland strain relief that I...

    The Appleton cable gland strain relief that I have accepts cables with an outside diameter of up to .75 inches. .75 inches converts over to 19.05mm. All of the 4 core steel wire armoured cable that...
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    14$$
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    414

    I like that idea as well. I am trying to...

    I like that idea as well. I am trying to understand why the size 20 gland is recommended for the 3 + 1 6mm^2 cable. From all of the charts that I can find the size 20 gland would be too small. I...
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    14$$
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    414

    According to this page...

    According to this page http://www.superimpex.com/cable_glands/technical_data.htm
    I will need a size 20 gland to fit a 3+1 6mm^2 cable. It also indicates that a 1/2 inch entry thread located on the...
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    14$$
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    414

    It is difficult to provide a cable gland when you...

    It is difficult to provide a cable gland when you do not know exactly what cable will be used. I believe the 4 conductor 6mm^2 cable will be used. I am hoping that it is not 20mm in outside...
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    14$$
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    414

    SOOW means that the conductors as well as the...

    SOOW means that the conductors as well as the jacket are oil resistant and water resistant. SOOW is a little more robust and tuff than plain SO cable.

    I am trying to size an opening in my...
  25. Replies
    14$$
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    414

    10/4 SOOW--European Equivalent

    Can someone please recommend what type and size of cable would be used in place of 10/4 SOOW cable in the European Union?
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