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I bought something call a Chill-Chaser on eBay. Its a 120V/1000W heat stick with a temperature control knob. Its old and only had a two wire (no ground) cord. Thinking it would be safer, I rewired it with a three wire cord. Previously it would not trip the GFCI. Now its fine at low temperature settings, but after its been run at the high setting for a long time it trips the GFCI. I cautiously plugged it into a non-GFCI outlet and it works with no issues at any temperature setting. No breaker tripping. No electric leaks that I could detect.
The temperature control is a very simple and small unit. Theres a probe between the loop of the heating element. A plunger retracts at higher temperatures to separated two contact points and stop the flow of current. A screw is used to set the distance between the contacts and control the temperature. Once the set temperature is met, it flutters between on and off to hold it.
Why the GFCI problems with the three wire set-up?
The temperature control is a very simple and small unit. Theres a probe between the loop of the heating element. A plunger retracts at higher temperatures to separated two contact points and stop the flow of current. A screw is used to set the distance between the contacts and control the temperature. Once the set temperature is met, it flutters between on and off to hold it.
Why the GFCI problems with the three wire set-up?