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Running wire for a thermostat
I'm renovating a three family home in Brooklyn, NY which is heated by a 1-pipe Gas Steam boiler/ radiator system. New boiler installation.
The contractor hooked up the boiler to a Honeywell thermostat using the old thermostat wiring. The wire runs from the thermostat along the wall, out the side of the building, down the facade, to the backyard and then back into the building. Terrible, I know.
I have a shaft-way open for some electrical work and I'd like to run a thermostat wire down that pathway.
I might use a Nest thermostat so I can control the system using Wifi.
A/C will be windows units that tenants control themselves.
1. Should I use 18/5 wire? Extra wire's in case some go bad.
2. Is there a special casing / jacket to protect the wires in the run? I realize they are low voltage and don't need to be inside EMT / Conduit, but I don't want them getting damaged.