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?
First we need to know what other circuits run through the 1/2" conduit, if any?
This is my question:
As a fire alarm contractor I highly recommend that you do not reuse 35 year old 1/2" conduit. There are at least two reasons why
So your two options are either replacing the conduit with 3/4" or running the cable exposed where possible. We have installed many fire alarm systems in department stores with free-run cable (where code allows of course).
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