UL 961:2000 pdf download Electric Hobby and Sports Equipment
1 Scope
1.1 These requirements cover electrically-powered hobby and sports equipment rated 250 volts or lessfor use in ordinary locations in accordance with the National Electrical Code, NFPA 70.
1.2 These requirements cover equipment intended for the home entertainment and amusement of adults
1.3 These requirements do not cover toys and games intended to be used by children, amusementmachines, photographic equipment, or other products that are covered by separate requirements.
1.4 ln the following text, a requirement that does not apply to all of the types of products covered by thisstandard is identified by a specific reference in that requirement to the type or types of product involvedAbsence of such specific reference or use of the term product indicates that the requirement applies to altypes of products unless the context indicates otherwise
1.5 A product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements in this standard, and that involves a risk of fire or of electric shockor injury to persons shall be evaluated using appropriate additional component and end-productrequirements to maintain the level of safety as originally anticipated by the intent of this standard. Aproduct whose features, characteristics, components, materials, or systems conflict with specificrequirements or provisions of this standard does not comply with this standard. Revision of reauirementsshall be proposed and adopted in conformance with the methods employed for development, revision, andimplementation of this standard.
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 withthe requirements for that component. See Appendix A for a list of standards covering components usedin the products covered by this standard.
2.1.2 A component is not required to comply with a specific requirement that:
a) lnvolves a feature or characteristic not required in the application of the component in theproduct covered by this standard,or
b) ls superseded by a requirement in this standard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 ofuse.
2.1.4 Specific components are incomplete in construction features or restricted in performancecapabilities. Such components are intended for use only under limited conditions, such as certaintemperatures not exceeding specified limits, and shall be used only under those specific conditions.
2.2 Units of measurement
2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
2.2.2 Unless otherwise indicated, all voltage and current values mentioned in this standard areroot-mean-square(rms).
2.3 Undated references
2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shalbe 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 LINE-VOLTAGE CIRCUIT – A circuit involving a potential of not more than 250 volts and havingcircuit characteristics in excess of those of a low-voltage circuit.
3.3 LOW-VOLTAGE CIRCUIT – A circuit involving a peak open-circuit potential of not more than 42.4volts supplied by:
a) A primary battery;
b) A Class 2 transformer; or
c)A combination of a transformer and a fixed impedance that, as a unit, complies with allperformance requirements for a Class 2 transformer.
A circuit derived from a line-voltage circuit by connecting a resistance in series with the supply circuit asa means of limiting the voltage and current is not considered a low-voltage circuit.
CONSTRUCTION
4Enclosure
4.1 A product shall have the strength and rigidity necessary to resist the abuses to which it may besubjected, without increasing the risk of fire, electric shock, or injury to persons due to total or partiacollapse of the enclosure and resulting reduction of spacina, loosening or displacement of a part, or othermalfunction.