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cowboy19666
I have 3 500 THHN .7073 sq. in area and I choose a 2" EMT AS THE RACEWAW WITH 2.013 Sq. in. area, and I use chapter 9 note 4 that allows me to fill the conduit to 60%, am I correct? because this looks like it's too small, but I'm doing practice quizzes on line and the person is saying 2" EMT IS THE CORRECT SELCTION?
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walterlewert
Air supply piping from and air compressor. I see that some air compressors are connected with stainless steel braided hose. Does this hose have to be listed for fire protection use? I can’t seem to locate any relevant information in NFPA 13. 
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isaacmand
If I have a hypothetical 480/277V, 3 Phase, 4 wire feed to a distribution panel. (Spare panel for future use, we do not know the load) Do you de-rate because it is 4 wire? Following 310.15(B)(5)(c) If the majority is non-linear (meaning greater than 50%?) we would de-rate because of 4 wire. (Correct?) Or does this apply only to a branch circuit,
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taylor.hunter
Hello all,    We recently had to upgrade all of our products to run with Design B energy-efficient motors. After a few weeks we started getting customer complaints of nuisance tripping. After investigating we discovered the new motors have much higher inrush ratings.    For example: Motor FLA was 13.1, with inrush spikes up
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