前言:这是低压熔断器的通用UL、CSA和ANCE标准——第5部分:G类熔断器。这是CSA C22的第二版。1996年第一版和第二版（NM-248/UL-5-248）的第一版。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。本标准已被美国国家标准协会（ANSI）批准为美国国家标准。一般说明——本部分将与低压熔断器标准第1部分:一般要求（以下简称第1部分）一起阅读。本部分中条款的编号与第1部分中编号相同的条款相对应。除非本部分修改，否则第1部分的要求适用。对于以下未显示的条款，请参考低成本标准- 电压熔断器–第1部分:一般要求，NMX-J-009/248/5-2000-ANCE•CSA C22。2号248.1•UL 248-1。范围:本部分适用于额定电流为20A或以下，交流电压为600V的G类熔断器；21-60 A，480 V ac.DC额定值是可选的。

Preface:This is the common UL, CSA, and ANCEStandard for Low-Voltage Fuses – Part 5: Class G Fuses. This is the second edition of CSA C22.2 No. 248.5-00 (superseding the first edition, published in 1996), the second edition of UL 248-5, and the first edition of NMX-J-009/248/5-2000-ANCE.This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard.General NOTE – This Part is intended to be read together with theStandard for Low-Voltage Fuses – Part 1: General Requirements, hereafter referred to as Part 1. The numbering of the Clauses in this Part corresponds to like numbered Clauses in Part 1. The requirements of Part 1 apply unless modified by this Part. For Clauses not shown below, refer to theStandard for Low-Voltage Fuses – Part 1: General Requirements, NMX-J-009/248/5-2000-ANCE • CSA C22.2 No. 248.1 • UL 248-1.Scope:This Part applies to Class G fuses rated 20 A or less and 600 V ac; 21 - 60 A, 480 V ac. DC ratings are optional.