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Functional Safety Standard
UL 991
UL 991: Standard for Safety-Related Controls for Household Appliances
Official DocumentationOverview
UL 991 provides requirements for safety-related controls and systems in household appliances. It focuses on the evaluation of control systems to prevent hazards from component failures.
Scope
Applies to safety-related controls and safety systems for household appliances. Covers both hardware and software aspects of control systems.
Key Requirements
1 Component failure analysis
2 Single fault condition testing
3 Control system reliability
4 Hazard prevention mechanisms
5 Software validation
6 Construction requirements
7 Temperature and endurance tests
Target Audience
Appliance manufacturers for North American market
Control system designers
Product safety engineers
Testing laboratory personnel
Compliance managers
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