Thermostat Contact Ratings

Status
Not open for further replies.
A

aissuper

Member
Is it acceptable to use a thermostat (rated to 22A) to switch a 22A load on a thirty amp CB? Contractor is claiming the contactor must be rated 30A.
 
Re: Thermostat Contact Ratings

Originally posted by aissuper:
Is it acceptable to use a thermostat (rated to 22A) to switch a 22A load on a thirty amp CB?
Click to expand...
If the actual load is 22 amps (before adding 25%) the thermostat would have to be "listed for continuous operation at 100 percent of its rating". 424.3(B)

If it is not 100% rated a 22 amp rated thermostat can only be loaded to 18 amps.
 
Status
Not open for further replies.
Top