Skip navigation

News

Forums
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?
3

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. 
0
Top & Trending
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,
28
Top & Trending
kcaponigro
At a recent NFPA event, we were asked:   A question we struggle with often is when is the requirement for hydraulic calc’s necessary based on amount of added sprinkler heads?   Tell us, is this a question you struggle with as well?   VOTE and read below for a response from NFPA's Principal Fire Protection Engineer, Matt
2