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That table is only valuable for getting a possible range of KVA based on the design “letter” (in this case C), not Locked Rotor Current. Read the table column labels closely. In practical use, the LRC is used for sizing disconnects, so Table 430.251(A) or (B) would be the useful table.  If you...

Not that I’m aware of. I’ll use Bluebeam at work tomorrow to check for where there are changes. It can compare documents for differences. In glancing at it briefly, I didn’t notice what changes were made. 

The question is vague enough that I would argue that you could reasonably assume that it is a single load especially when the question is asking for the maximum overcurrent protective device. I use the NEC everyday and I find that many of the people who write practice tests with NEC questions...

It is because the 300% for fuses or the 250% is the maximum overcurrent protective device. You can size the fuse or circuit breaker as small as you want, but it might trip depending upon your loads and inrush currents.

I’m not using any other literature at this point. Any time I run into a practice problem that I know I have the answer in one of my resources, I do my best to recall it. Then go back to that section and read it over a few times to try to memorize it. It is so stupid to have to resort to...

You are correct if you are looking at the older version of the handbook . Instead of , it should be . And Instead of , it should be . They have corrected it in version 1.1.

I think you understand how to use the formula. They have attempted to simply the formula from a form with no angle and a formula with an angle. The formula without the cos(Θ) is the inverse square law. With the cos(Θ) is the inverse square cosine law. When Θ is 0 degrees, the cos(Θ) is 1 and the...

Just found that. Why would you define Vline as Vmax? There is no reason to redefine variables where it makes your formula shorter. Use the typical formulas found in textbooks. 

*Edit: I see this was already discussed. No idea why they would define Vline as Vmax. I don’t know of any other cases where you would use Vline as the maximum value. It just makes no sense...* I discovered an error in one of the formulas this morning, so I thought I would start a thread for...

Have you actually looked at the so call “reference handbook”? The exam specifications list 11-17 questions for protection. There are no sections that cover protection. How do you rectify that? There are multiple sections where the formulas listed do not have the variables defined. We should...

Been studying for this damn test for over a year and now they change the format of the test with the last two exams I have been registered for being cancelled. What a load of garbage. Their reference manual is significantly lacking in formulas and information on typical problem types based on...

Would love to have a copy. Really appreciate all you do with your course, videos, articles, and insight.

Yeah, I agree that it is the wording. It is a really weird question. The power available is still the same (minus any losses in the transformer) as the available power from the infinite bus which is unchanged. The fault current will be less on the secondary side of the transformer, which is what...

I agree that he’s trying to get at the harmonics reduction with a delta-wye transformer, but is doing it backwards by giving the example of the wye-wye. I do not understand the “there is no neutral” comment either. In the delta-wye, you don’t have a neutral on the delta side and create a...

That is only verifying that the bubbles you filled in were properly transferred from the scantron machine to their system. That is it. 

Did you buy all of them? Is the book just formulas and theory and the tests are only practice tests?

The pass rate is ridiculously low compared to historical numbers and other disciplines. They really need to adjust something to make it more equitable for engineers taking the Power exam. There would be more than a hundred more passers with a comparable pass rate to other disciplines.  Here are...

Failed 47/80

Still waiting on Nebraska. Usually a 1st day state.

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