Search:

Type: Posts; User: fifty60

Page 1 of 8 1 2 3 4

Search: Search took 1.45 seconds.

  1. Replies
    14$$
    Views
    196

    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.
  2. Replies
    14$$
    Views
    196

    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...
  3. Replies
    14$$
    Views
    196

    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...
  4. Replies
    14$$
    Views
    196

    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...
  5. Replies
    14$$
    Views
    196

    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?
  6. Replies
    14$$
    Views
    196

    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...
  7. Replies
    14$$
    Views
    196

    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....
  8. Replies
    14$$
    Views
    196

    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...
  9. Thread: BX Connector

    by fifty60
    Replies
    9$$
    Views
    342

    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...
  10. Thread: BX Connector

    by fifty60
    Replies
    9$$
    Views
    342

    BX Connector

    Are BX connectors considered compression bushings?
  11. Replies
    19$$
    Views
    453

    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?
  12. Replies
    19$$
    Views
    453

    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...
  13. Replies
    19$$
    Views
    453

    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...
  14. Replies
    58$$
    Views
    1,712

    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...
  15. Replies
    3$$
    Views
    167

    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?
  16. Replies
    3$$
    Views
    167

    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...
  17. Replies
    14$$
    Views
    400

    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...
  18. Replies
    14$$
    Views
    400

    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...
  19. Replies
    14$$
    Views
    400

    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...
  20. Replies
    14$$
    Views
    400

    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...
  21. Replies
    14$$
    Views
    400

    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...
  22. Replies
    14$$
    Views
    400

    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?
  23. Replies
    0$$
    Views
    122

    Equipment Ventilation

    Can anyone recommend any good books/websites that discuss equipment ventilation? I want to understand how the hot air is flowing around my sub panel area, and what techniques I should employ when...
  24. Replies
    2$$
    Views
    184

    So the motor is actually a TEAO motor, so the...

    So the motor is actually a TEAO motor, so the very top of the transformer is a fan. So it might create a mechanical hazard, but not electrical. Are the ambient on these types of motors as strict as...
  25. Replies
    2$$
    Views
    184

    Open Air Cooled Motor Protection

    I have a small fraction open air cooled motor with Nema Class B insulation. Kind of a silly question, but what would happen if I put a 4 inch test pin gently into the vented portion of the top of...
Results 1 to 25 of 200
Page 1 of 8 1 2 3 4