I am working through a exam test prep book, and I came across this question that asked me to calculate the demand for a restaurant. Part of the calculation included 10 heavy duty lampholders. I calculated these as 10 X 600 X 125% = 7500va. When looking at the test solution I was slightly off on my amperage because the book didnt calculate the heavy duty lampholders as a continous load. Am I missing something? TIA
I'll take a stab at this...
While commercial lighting is usually a continuous load, it is not required to be treated as such unless it actually meets the definition of a continuous load and is on for more than 3 hours.
That said, I have not done a commercial load calculation in quite a while. I would have made the same assumption that you did, that the heavy duty lamp holders are Mogul base, and probably for exterior parking lot lights, which would definitely be continuous loads. I am curious as to where in the book it would tell you to use 600 watts per lamp holder. unless it was supposed to be part of the 3 volt amp per square foot, 600 watts per lamp holder is archaic with the advent of LED lights.
Could you print the exact parameters of the test question, and the book answer?
If anyone can point the two of us in the right direction, I'm all eyes.