Temperature Rise Testing
Both IEC 60320-1 (appliance couplers) section 21 and IEC 60884-1 (plugs and sockets) section 19 require temperature rise testing. IEC 60320-1 requires testing for 1 hour at 1.25 times rated current (e.g. 10A connector tested at 12.5A), and the temperature rise of the terminals and contacts is not to exceed 45K. The test of IEC 60884-1 is similar, but is conducted at rated current, or per test values specified in table 20.
Interpower Corporation uses temperature rise test equipment to simulate cords under full electrical load, and we measure how hot these devices get to make sure they do not exceed maximum temperature limits per UL817, UL498, IEC 60320, and IEC 60884.