Question: Electric Room to Class 1 div. 2 area: Cable tray with tray cable (501.4b)if room is pressureized ,I read it no cable seals required leaving the room.(501.5e).and also not at boxes meeting the requirements of (501.4b4) There is 480 volt to mtrs and cables to i.o. points,sealing required at mtrs But not i.o. points, Any thoughts on theses??
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