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Type: Posts; User: don_resqcapt19

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  1. Replies
    11$$
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    187

    In the example in this thread, the #10s would be...

    In the example in this thread, the #10s would be a feeder and the #12s the branch circuit. The #10s have 30 amp protection, so the 20 amp fuses are the branch circuit protection for the #12s.
  2. Replies
    11$$
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    187

    It is my opinion that both the fuse and the fuse...

    It is my opinion that both the fuse and the fuse holder have to be listed as suitable for use as branch circuit protection, not just the fuse itself.
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    11$$
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    187

    Most inline fuse holders are listed for use only...

    Most inline fuse holders are listed for use only as supplementary protection. You would need a fuse and fuse holder listed for use as branch circuit protection if you wanted to do this.
  4. Replies
    10$$
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    162

    Would that mean that I could use a 300 volt rated...

    Would that mean that I could use a 300 volt rated conductor on a 480Y/277 volt system?
  5. What provision of the code permits the use of...

    What provision of the code permits the use of that device? In, my opinion, the fact that the device is not listed in 250.118 prohibits the use of it.
  6. The concrete encasement in note "b" only applies...

    The concrete encasement in note "b" only applies where the raceway is not listed for direct burial without concrete encasement. Most of the non-metallic raceways that we install are listed for...
  7. Concrete encasement does not change the required...

    Concrete encasement does not change the required burial depth.
  8. Now you have to use "semiconductor" fuses, not...

    Now you have to use "semiconductor" fuses, not just "suitable" fuses.
  9. Replies
    4$$
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    144

    Are both the 24 VDC power and the 4-20mA circuits...

    Are both the 24 VDC power and the 4-20mA circuits Class 2 circuits? If one is and one isn't, in general they can't be mixed. If they both are Class 2 circuits they can be mixed. If neither are,...
  10. Your computer was not installed and the code does...

    Your computer was not installed and the code does not apply to it.
  11. Replies
    11$$
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    452

    Isn't it still an inductor?...just an air core...

    Isn't it still an inductor?...just an air core inductor.
  12. I strongly doubt that changing the transformer...

    I strongly doubt that changing the transformer had anything to do with the change in the current on the EGC.
  13. Replies
    12$$
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    260

    The water pipe is a parallel path for the neutral...

    The water pipe is a parallel path for the neutral in many cases, so even with the neutral in perfect condition there will be current on the water pipe and this current can cause an arc when the...
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    4$$
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    139

    Assuming the load calculation shows a load of 750...

    Assuming the load calculation shows a load of 750 amps or less you are fine with the 800 amp main.
  15. Replies
    7$$
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    166

    That is a good point. If so listed, it is a...

    That is a good point. If so listed, it is a single enclosure and a seal between the two parts would not be required.
  16. Replies
    7$$
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    166

    I don't see 501.15(A)(3) as saying you don't need...

    I don't see 501.15(A)(3) as saying you don't need a seal between the enclosures. I see it as saying you can use one seal if the raceway is 36" or less in length. The general rule requires a seal...
  17. Replies
    31$$
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    702

    Read all of 300.3(B). The general rule is that...

    Read all of 300.3(B). The general rule is that all of the circuit conductors, including the EGC must be in the same cable. 300.3(B)(3) acts as an exception where the cable has a non-magnetic jacket.
  18. Tell us exactly how you took these readings and...

    Tell us exactly how you took these readings and exactly where you took them. Also, current on the EGC is very unlikely to be caused by the transformer. Most of the time that is caused by neutral...
  19. A K rated transformer does nothing to remove a...

    A K rated transformer does nothing to remove a harmonic problem, if there is one. It just prevents damage to the transformer itself is there really is a harmonic issue.
  20. Replies
    25$$
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    398

    I think there is more than that. The GEC has to...

    I think there is more than that. The GEC has to originate at the grounding electrode, but you will need an EGC tap to the grounding point of the circuit that needs the EGC. Even though you would...
  21. It is an electrical source and has no direct...

    It is an electrical source and has no direct circuit conductor connections to another electrical source. How is it not an SDS?
  22. The transformers are rated for a rise over the...

    The transformers are rated for a rise over the ambient. The 40°C would be the maximum permitted ambient. The rise would often be 80°C or even 115°C over the maximum ambient. There is not an issue...
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    8$$
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    391

    I would expect that the threads on the EMT...

    I would expect that the threads on the EMT connector are too long to permit a bushing to tightly secure the connector to the enclosure. If that is the case, you need to use the locknut.
  24. Replies
    4$$
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    122

    You can't know the minimum length without knowing...

    You can't know the minimum length without knowing the temperature range that the raceway is exposed to. You need one where the calculated movement is 1/4" or more. Around here you can get that...
  25. It is an SDS and will require a grounding...

    It is an SDS and will require a grounding electrode system.
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