Implementation of the standard for Safety-Related Solid-State Controls for Household Electric Ranges, UL 858A

The Standard for Safety-Related Solid State Controls for Household Electric Ranges (UL 858A) was developed to address the unique properties of solid-state controls and covers oven temperature regulating, temperature limiting, self-cleaning (pyrolytic) oven door lock, and cooktop element control applications. UL 858A is concerned only with a control´s safety or protection functions. An overview of the requirements in UL 858A, with an emphasis on applications, is presented. A typical solid-state control is followed through several phases of its safety evaluation using UL 858A and its companion standards UL 244A and UL 873. The failure mode and effect analysis (FMEA) portion of the investigation is discussed in detail. The demonstrated test method (DTM) and environmental stress tests are also discussed. Also included is an overview of the new requirements in the Standard for Household Electric Ranges (UL 858)