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Type: Posts; User: fifty60

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  1. Replies
    5$$
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    181

    Would periodical insulation resistance or voltage...

    Would periodical insulation resistance or voltage withstand testing prevent this type of failure?
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    0$$
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    124

    Pendant Station Safety

    Is there a specific OSHA or NFPA document that lays out the minimum safety requirements for Machines operated from a Pendant Station?
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    5$$
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    181

    GFCI and Branch Circuit Protection

    There is equipment that uses open a nichrome wire heating heating elements. I am being told by an NRTL that the wire on the heater failing is a "normal part of the heater life cycle" and that I...
  4. Is type X purge an accepted method for making a...

    Is type X purge an accepted method for making a Class 1 Div 2 location unclassified? NEC says that purging make Class 1 Div 1 unclassified, but it does not clarify if the same is true for class 1...
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    2$$
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    148

    Lock-Out Tag-Out

    Is it the OEM's responsibility to place lock-out tag-out labels on the equipment, or is it the end users responsibility to add this labeling?
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    17$$
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    320

    Not sure what I am missing here...where will I...

    Not sure what I am missing here...where will I find the fill chart for a 10 X 8 X 4 junction box?
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    17$$
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    320

    What if I have a 10" box, 314.16(A) only covers...

    What if I have a 10" box, 314.16(A) only covers up to 4" boxes..
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    17$$
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    320

    314.16(A0 Metal Boxes

    When a Box trade size is given in inches as (4 X 1 1/4). Does this mean that the box is 4" Lenght X 4" Width X 1/4" depth?
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    0$$
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    127

    Equipment Grounding for Class 1 Division 1

    I have class 1 division 1 equipment that will use explosion proof enclosures and separate purged enclosures. NEC 501.30 states that article 250 is required, as well as 501.30(A) and (B).

    The...
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    2$$
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    234

    Looks like I will need to find different...

    Looks like I will need to find different components for my side project. Thanks for the input.
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    2$$
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    234

    Stepping Down Stepper Motor Output Voltage

    I have a stepper motor driver that outputs 170V at 200 to 25000 pulses per second. The stepper that I am using is only rated for 30V. This is only a hobbyist project that i am working on with parts...
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    35$$
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    1,316

    Excellent, thanks

    Excellent, thanks
  13. Replies
    35$$
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    1,316

    50Hz Voltage Question

    In Europe, and most other 50Hz countries, 220-240V is generally obtained between a line conductor and neutral conductor. I know this is the case for cord connected equipment that operates off of...
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    8$$
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    333

    Reading NFPA 496, I do not see any requirements...

    Reading NFPA 496, I do not see any requirements for a specific NEMA style enclosure. I have been told by technical support for type X purge suppliers that I should use a NEMA type 4.

    The...
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    8$$
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    333

    Is it normal to purchase the enclosure and purge...

    Is it normal to purchase the enclosure and purge system in one assembly? Or, would I look to only purchase the purge system to use with any basic Hoffman enclosure?
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    8$$
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    279

    Thanks for the suggestions..

    Thanks for the suggestions..
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    8$$
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    279

    Single Shot (Rising or Falling edge) Relay

    I am trying to find an electromechanical relay that has its set and reset function activated from the rising (or falling) edge of a 24VDC signal.

    I am able to find a lot of single-shot time...
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    8$$
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    333

    Type X Purge for Class 1 Division 1

    Is type X purging an acceptable protection technique on an individual electrical enclosure inside of a class 1 division 1 location? Or, is type X purging meant to be applied to the entire room? ...
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    9$$
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    308

    Disconnects Line/Load from Top

    Does NFPA 70 dictate that the line conductors must enter from the top terminals of the disconnect? I know NFPA 79 goes into detail about the physical placement of a disconnect inside of a sub panel,...
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    3$$
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    198

    Smart$, thanks. GoldDigger, I had to read what...

    Smart$, thanks. GoldDigger, I had to read what you wrote 3 times, but it is very clear and to the point. Thanks.
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    3$$
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    198

    Extension Grade vs Thermocouple Grade Wire

    I am trying to understand the difference between Extension Grade and Thermocouple Grade wire. I can only use Thermocouple grade wire at my sensing point, and I can use extenstion grade wire to...
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    12$$
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    403

    Yes, the surface of the equipment is the 6th...

    Yes, the surface of the equipment is the 6th side. An HMI touchscreen, for example, mounted inside of a urethane enclosure that is then mounted on a stainless steel piece of machinery. In this...
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    12$$
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    403

    Why does connecting the shield to ground matter? ...

    Why does connecting the shield to ground matter? Lets say I have a piece of stainless steel that is 1 foot by 1 foot, and I apply a 600mHz RF signal across it. Will more reflect off of the...
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    12$$
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    403

    The wavelength for 600MHz is approximately 20...

    The wavelength for 600MHz is approximately 20 inches. I will need to keep any openings to less than 1/20th of that, so less than 1 inch..

    I am worried about the seams where the 5 sides plastic...
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    12$$
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    403

    I have a component that is radiating 600MHz. It...

    I have a component that is radiating 600MHz. It is housed inside a fabricated urethane enclosure. I would like to use conductive paint to coat the inside of the enclosure, which will effectively...
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