UL 5:2009 free download

UL 5:2009 free download Surface Metal Raceways and Fittings
1 Scope
1.1 These requirements cover surface metal raceways and fittings for use in accordance with the NationalElectrical Code,NFPA 70.
1.2 Raceways of the following thicknesses are intended to enclose circuits operating at potentials notexceeding 6oo volts between conductors:
a) Raceways that are entirely of metal at least 0.040 inch (1.02 mm) thick nominal and
b)Raceways consisting of nonmetallic covers on metal bases of the thickness indicated in (a).Thinner all-metal raceways or raceways of thinner metal bases with nonmetallic covers are intended toenclose circuits operating at potentials lower than 300 volts between conductors.
1.3 These requirements do not cover cable trays,wireways or nonmetallic raceways.
1.4 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 requirementsshall 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) Involves 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b) ls superseded by a requirement in this standard.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.
2.3 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.
2.4 Installation
2.4.1 The method of installation, as outlined in the instructions accompanying the raceway and fittings,shall be practical and feasible under the conditions met in practice.
2.4.2 The raceway, fittings and any wiring devices or accessories are to be installed as intended andexamined with regard to the feasibility of installation, as well as for compliance with the construction,performance,and marking requirements in this standard.Attention is to be given to items that requireparticular care on the part of the raceway installer.
2.5 Nonmetallic parts
2.5.1 A nonmetallic cover，fitting or other part of a metal raceway shall comply with the applicablerequirements in the Standard for Nonmetallic Surface Raceways and Fittings, UL 5A.
3 Glossary
3.1 For the purposes of this standard,the following definitions apply:
3.2 ACCESSORY – A part that is added to a raceway system for a special purpose (for example,guards, hangers, or retainers).