Standard No.:	GB 16840.4-1997
English Name:	Technical determination method for electrical fire causee - Part 4: Metallographic method
Chinese Name:	电气火灾原因技术鉴定方法 第4部分：金相法
Chinese Classification:	C82    Fire protection technology
Professional Classification:	GB    National Standard
Issued by:	CSBTS
Issued on:	1997-6-3
Implemented on:	1998-5-1
Status:	superseded
Superseded by:	GB/T 16840.4-2021 Technical determination methods for electrical fire evidence—Part 4: Metallographic analysis method
Superseded on:	2021-8-20
Language:	English
File Format:	PDF
Word Count:	3000 words
Price(USD):	264.00
Delivery:	via email in 1~3 business day

本标准规定了定义、原理、设备器材、方法步骤、判定和送检及鉴定时应履行的书面程序。本标准适用于在调查电气火灾原时，从铜、铝导线上的火烧熔珠和短路熔珠的不同金相组织的变化特征，鉴别其熔化原因与火灾起因的关系。即：是火烧熔珠还是短路熔铸？是一次短路熔珠还是二次短路熔珠。