UL 1480A:2016 free download

UL 1480A:2016 free download Speakers for Commercial and Professional Use
2 General 2.1 Components
2.1 .1 Except as indicated in 2.1 .2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by this standard.
2.1 .2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or
b) Is superseded by a requirement in this standard.
2.1 .3 A component shall be used in accordance with its rating established for the intended conditions of use.
2.1 .4 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.
2.2 Units of measurement
2.2.1 Unless otherwise indicated, all voltage and current values mentioned in this standard are rms.2.2.2 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
2.3 Undated references
2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shallbe interpreted as referring to the latest edition of that code or standard.
3 Glossary
3.1 For the purpose of this standard, the following definitions apply.
3.2 AUDIO CIRCUITS (HIGH-VOLTAGE)- Commercial or professional speakers for connection inaccordance with Article 640 of the National Electrical Code,ANSI/NFPA 70, that are used for music orvoice communication and are rated more than 120 volts.
3.3 AUDIO CIRCUITS (LOw-vOLTAGE)- Commercial or professional speakers for connection inaccordance with Article 640 of the National Electrical Code, ANSI/NFPA 70, that are used for music orvoice communication and are rated 120 volts or less.
3.4 BI-AMPLIFIED SYSTEMS – Systems that employ two or more speakers that are cross-overedbefore the amplifier with separate amplifiers powering the low and high frequency transducers.
3.5 CHEESECLOTH INDICATORS – Cheesecloth used for tests shall be untreated cotton clothrunning 14 – 15 square yards per pound(26 – 28 square meters per kilogram) and having what isknown in the trade as a”count of 32 by 28″.
3.6 CRITICAL COMPONENT -With regard to the risk of fire and electric shock, a critical componentis a part that:
a) Encloses a high-voltage part(s);
b) ls capable of coming into contact with a source of ignition;c) Supports a live part; or
d) ls capable of coming into contact with a live part.
3.7 DISTRIBUTED AUDIO SYSTEMS – Distributed audio systems, also referred to as constantvoltage systems, provide a constant voltage from the amplifier to the speaker and usually have longwire runs between the amplifier and the speakers. Typical distributed audio voltages are 25,70, or 100volts.
3.8 ELECTRICAL CIRCUIT (HIGH-VOLTAGE)- A circuit other than audio involving a potential of notmore than 300 volts and having circuit characteristics in excess of those of a low-voltage circuit.