Please note: All interim revisions for this edition available at time of your purchase will be included.

This new edition of ANSI/UL 399 is being issued to incorporate the following changes:

Addition of parameters for alternative capacitor requirements in the Standard for Fixed Capacitors for Use in Electronic Equipment, UL 60384-14

Addition of start-to-discharge test to allow pressure relief valves, other than ASME stamped valves, on pressurized product systems

Clarification of requirements involving ultraviolet radiation lamps

Align controls requirements with water heater controls requirements and add alternate protective electronic controls requirements



Revisions to Supplement SB for drinking water coolers employing a flammable refrigerant Addition of requirements for remotely operated drinking water coolers

Clarification of test enclosure requirements

Addition of requirements for household drinking-water coolers incorporating button or coin cell batteries

Addition of grounding symbol

Editorial corrections