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  1. Replies
    12$$
    Views
    215

    Actually, it's easy to guess... ...

    Actually, it's easy to guess...







    ...difficult to be accurate!
  2. Thread: Transformers

    by Smart $
    Replies
    7$$
    Views
    179

    He's referring to primary only transformer...

    He's referring to primary only transformer protection. I'm referring to primary and secondary transformer protection.
  3. Thread: Transformers

    by Smart $
    Replies
    7$$
    Views
    179

    Can even go as high as 300A primary ocpd... as...

    Can even go as high as 300A primary ocpd... as long as you don't exceed 400A secondary ocpd total
  4. Replies
    8$$
    Views
    300

    ...shouldn't...

    ...shouldn't...
  5. Replies
    1$$
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    98

    Why not use a primary and secondary protection...

    Why not use a primary and secondary protection schema? Use a 15A branch circuit breaker to supply the primary. Fuse the secondary.
  6. Replies
    8$$
    Views
    300

    I should note that the preceding makes some...

    I should note that the preceding makes some assumptions and as a result will include some error. For example, youmay base your circuit current on X number of loads times the rated current of each...
  7. Replies
    8$$
    Views
    300

    Quite simply, voltage drop is current times wire...

    Quite simply, voltage drop is current times wire impedance. So you take the current at the source of the circuit and multiply by the impedance of the first leg. Do this for both legs that the first...
  8. Replies
    4$$
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    107

    If you have a portion of a run that is 'bundled'...

    If you have a portion of a run that is 'bundled' less than 24", then it is not considered a 'section' under (A)(2) Exception.

    Also keep in mind the (A)(2) Exception is regarding the length of the...
  9. Replies
    7$$
    Views
    237

    It is the most correct panel schedule method...

    It is the most correct panel schedule method short of including power factor (phase angles) and doing the vector math.
  10. Yet in this case, with a 60/75 termination, you...

    Yet in this case, with a 60/75 termination, you are not limited to the 60 deg ampacity. 250.122(B) refers to the minimum size wire (for the conditions of use). Applying 60 deg termination...
  11. It's an 'if...then..." requirement in the respect...

    It's an 'if...then..." requirement in the respect that "only one of the following" "provisions... shall be used".

    1) Conductors are not rated 60 degrees C... so cannot be used.

    2) Conductors...
  12. Replies
    7$$
    Views
    237

    I'd enter line VA as normal... one-third for 3...

    I'd enter line VA as normal... one-third for 3 phase loads, one-half for line-to-line single phase, and full VA for line to neutral, then divide column VA totals by 138.6V [i.e. 240V/sqrt(3)].
  13. It is not the 'ONE' part of 110.14(C)(1)(a) that...

    It is not the 'ONE' part of 110.14(C)(1)(a) that sets the determination... it's the 'SHALL'. The only use of 'permitted' is in 110.14(C)(1)(a)(4).

    It seems to me 110.14(C)(1)(a) says, "If the...
  14. Well that's the usual discourse for something...

    Well that's the usual discourse for something that should be explicit but not.
  15. And it seems to me 110.14(C)(1)(a)(3) says quite...

    And it seems to me 110.14(C)(1)(a)(3) says quite the opposite in that with a /75 rating we must use the 75 column for 75 and 90 conductors.
  16. And I would agree with that if it is in the...

    And I would agree with that if it is in the listing standard that you can. It certainly isn't explicitly provided for in the Code.
  17. Yes... but 110.14(C)(1)(a)(3) is also...

    Yes... but 110.14(C)(1)(a)(3) is also applicable... and that's the dilemma. Who gets to decide which when it comes to determining whether the #1 is compliant with or in violation of 250.122(B)...???...
  18. Okay, that covers the obvious... so I should have...

    Okay, that covers the obvious... so I should have alluded to within the context of the OP.

    IOW, with a 60/75 rating are we required to use 75 column with 75 and 90 conductors ... or can we use the...
  19. Thread: 300.3(B)

    by Smart $
    Replies
    31$$
    Views
    702

    Ummm... it doesn't agree with post #7 unless you...

    Ummm... it doesn't agree with post #7 unless you run single conductors in the drop conduit. Debatable whether stripping the jacket off the cable qualifies, but it does IMO if you use a cable gland...
  20. Thread: 300.3(B)

    by Smart $
    Replies
    31$$
    Views
    702

    IMO you can run single or parallel 4/C (without...

    IMO you can run single or parallel 4/C (without EGC) and separate single EGC in cable tray. In fact, if the cable tray qualifies as an EGC, you don't have to run any with the conductors, no matter...
  21. Thread: Wire ampacity?

    by Smart $
    Replies
    12$$
    Views
    287

    What I'd like to know is why you are asking......

    What I'd like to know is why you are asking... :blink:
  22. Replies
    6$$
    Views
    216

    No the transformer won't fry. Think of it this...

    No the transformer won't fry. Think of it this way... each half of the secondary winding can handle 5kVA @ 120V.

    PS: Welcome to the forum :thumbsup:
  23. Exactly what does a 60/75 terminal marking mean?

    Exactly what does a 60/75 terminal marking mean?
  24. Replies
    30$$
    Views
    1,056

    To me, your reply can be likened to a political...

    To me, your reply can be likened to a political candidate's debate response to a major topic yes or no answer question... :slaphead:
  25. Replies
    30$$
    Views
    1,056

    I am at a loss for understanding exactly how the...

    I am at a loss for understanding exactly how the system is set up. First, if all you have to measure tank fill level while running are high-high and high-low level switches, then any calculation for...
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