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Fire alarm system replacement, conduit size?

Question asked by dsherer on Jan 24, 2020
Latest reply on Jan 30, 2020 by dprattsg

We have a 35 year old fire alarm system in a dept store that needs replaced. The system is currently installed in 1/2" emt conduit. Is it permitted (code wise) to re use the existing 1/2" conduits with new wire, or does it require 3/4" emt?

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