I'm running new thermostat wire to my boiler (so I can get a c-wire to new thermostats). The old wiring runs along the heat pipe before it attaches to the zone valves. It used to be secured by wire, but someone removed it (left the wire) and used electrical tape to secure it. The old wiring has a cloth like jacket, which probably can handle the heat. The new stuff has a vinyl like jacket. I'm unsure if it's ok to have it that close to the heating pipe. Is there a professional/proper way for doing this?
UPDATE: I found the manufacturer's spec sheet on the wire. The jacket is PVC and the wire is only rated to 60 degrees Celsius. To me, that means you shouldn't have it touching the heating pipes.