Controls for 277V Infrared Heaters

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b1miller

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Location
Washington
Occupation
Electrician/Electrical Administrator/SCADA Engineer
The museum director at the Railway Museum that I volunteer at has asked me to spec and install a couple of electric infrared heaters to supply heat to volunteers working at the ticket office. It is an open area located in the larger exhibit building. The situation seems ideal for mounting a couple of 2000W heaters rated at 277V each. What would be the best way to control these heaters since they do not be on continuously but only during hours when someone is actually in the ticket office. I plan to mount them hanging from the overheard steel beams with all thread and beam clamps at about 12-16 feet above the floor. I had thought about a timer switch that the personnel could turn them on for a set period when needed.

Your thoughts?
 
I have several panels available. One is 208/120 and the other is 480/277. Conduit runs are similar. The contactor with a timer switch is what I am thinking also.
 
Recommend three smaller heaters (because you have 3ph) and control them with a 3p contactor.

The higher voltage will allow smaller conductor and contactor ampacities.

Then you can use any combination of controls, such as a thermostat, an occupancy sensor, a timer, a manual switch, etc.
 
Good idea especially since I have a spare 15A breaker in the 480V panel.
 
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