1 Scope

1.1 These requirements cover power-operated audio equipment and accessories, rated 300 volts or less, that are intended for use in commercial enterprises or establishments and other locations such as churches, schools, theaters, and factories. This equipment is for use on supply circuits in accordance with the National Electrical Code, NFPA 70.

1.2 Commercial audio equipment includes amplifiers, preamplifiers, mixers, signal processors, public address and centralized sound systems, intercommunicating devices and systems, phonographs, tape players, and recorders, radio receivers, tuners, and tuner-amplifiers, power supplies intended for use with commercial sound systems, special effects units, and integral amplifier-speakers.

1.3 These requirements also cover accessories for use with commercial audio equipment such as tape erasers and head demagnetizers.

1.4 These requirements do not cover equipment that is covered by individual requirements separate from this standard such as:

a)    Dictating and transcribing machines for office use;

b)    Musical instruments and accessories for non-professional use;

c)    Household type amplifiers, tuner-amplifiers, phonographs, radio receivers, and recorders; and

d)    Amateur radio equipment.

1.5 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.

Summary of Topics

This revision to UL 813 is being issued to remove the reference to the withdrawal date of UL 873 and to address universal upkeep of UL Standards for Safety. These revisions are considered to be non-substantive and not subject to UL’s STP process.