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Control tubing serving other than smoke control functions shall be isolated by automatic isolation valves or shall be an independent system.
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513.13.2 Exhaust Systems, Isolation From Other Functions
Control tubing serving other than smoke control functions shall be isolated by automatic isolation valves or shall be an independent system ...
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(A) Special Equipment, PV System Grounding Configurations
PV arrays according to 690.7(C) with a functional ground reference (center tap) PV arrays not isolated from the grounded inverter output circuit ...