STANDARD FOR SAFETY General-Use Snap Switches

标准状态

基本信息

标准简介

UL 20 STANDARD FOR SAFETY General-Use Snap Switches1 Scope1.1The requirements of this Standard apply to manually operated,general-use snap switches forconnection to copper(Cu) or copper-clad conductors used in accordance with the National Electrical Code(NEC)，ANSI/NFPA 70,or the Canadian Electrical Code (CE Code),Part l, and intended to bepermanently connected in accordance with the NEC and the CE Code, Part l. In Canada, requirements forswitches for connection to aluminum(Al) conductors used in accordance with the CE Code, Part l, andintended for connection to wiring systems recognized by the CE Code, Part l, are covered in AnnexB1.2This Standard applies to acldc rated switches for which the load ratings do not exceed 60 A at 250vor less,30 A at 251V-600 v, and 2 hp at 125V- 600 V or less. This Standard also covers ac-only ratedswitches for which the load ratings do not exceed 30 A at 347 VAC or less.1.3 This Standard applies to switches constructed to be installed readily in a flush device box or on anoutlet-box cover and intended for connection to branch-circuit wiring.1.4 This Standard applies to pendant and through-cord switches intended for field installation on flexiblecord

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