Construction of electrical machine equipment explosion proof structural standard

1．The standard established by the Minister of Health, Labor and Welfare for the explosion-proof electrical machine is only one “Electrical machine explosion-proof structural standard” (Ministry of Labor, 1951) Notification No. 16; hereinafter referred to as the “structural standard”. )only.

Although there is only one structural standard, an electro-mechanical device that does not conform to the standards (hereinafter referred to as “standards” in this Article) specified in “Chapter 2 (except for Section 8) to Section 4” of Article 5 Among these, special materials are used, or special shapes, or used in special places, or manufactured based on international standards etc. related to standards, etc. Those that have been confirmed by tests, etc. to have the same or higher explosion-proof performance as a compatible electric machine instrument are considered to conform to the standard. Because the standard system based on the international standard (IEC standard) is used as the standard of the test based on the rule “,” there are essentially two standard systems.

As a standard based on international standards, “technical standards” (abbreviation) have been used since 1988, but the notification of 2010 (Early 0824 second issue; August 24, 2010) “Technical standards” will be abolished with the release of
Starting from August 24, 2010, those conforming to the “International harmonized explosion-proof guidelines 2008” 2) are treated as conforming to the structural standard in place of “Technical Standard” by Basic 0824 2nd. However, the 2nd issue of 0831 was issued on August 31, 2015, and the “International harmonized Explosion Guidelines 2015” 3) became a new standard (the International harmonized Explosion Guidelines 2008 was abolished).

We introduce the standards and related notices below.
Related to structural standards
・Full Text of “Structural Standards”
Ministry of Labor Notification No. 16 April 01, 1969
“Electric machinery and equipment explosion proof structural standard”
（It is searchable in the Ministry of Health, Labor and Welfare database system ）

・About “Structural Standards” revised in 2008
September 25, 2008 Base No. 0925001
平成20年9月25日 基発第0925001号「労働安全衛生規則の一部を改正する省令の施行及び電気機械器具防爆構造規格及び昭和四十七年労働省告示第七十七号の一部を改正する告示の適用について」
“About the enforcement of the ministerial ordinance which revises a part of the occupational safety and health regulations and the application of the notification which revises a part of the electrical machinery and appliances explosion proof structural standard and the Ministry of Labor notification No. 77 of 1972”

・About the test equipment concerning the “structural standard” revised in 2008
September 25, 2008 Base No. 0925004
平成20年9月25日 基発第0925004号「機械等検定規則の一部を改正する省令の施行について」
“About the enforcement of the ministerial order to amend a part of the machine inspection rules”
Related to the International Alignment Explosion Guidelines
平成27年8月31日 基発0831第2号「電気機械器具防爆構造規格第5条の規定に基づき、 防爆構造規格に適合するものと同等以上の防爆性能を有することを確認するための基準等について」
・”About standards to confirm that it has the same or more explosion-proof performance as those conforming to the explosion-proof structural standard based on the provisions of the Article 5 of the electrical machine equipment explosion-proof structural standard”
August 31, 2015 Fundamentals 0831 second



2．Structural standard test criteria
The following two factory electrical equipment explosion protection guidelines are the basis for certification of structural standards.

(1) Factory electrical equipment explosion protection guidelines (gas vapor explosion-proof 2006) NIIS-TR-NO. 39 (2006)
(2) Factory electrical equipment explosion protection guidelines (dust explosion protection 1982) RIIS-TR-82-1

3．Should we apply “structural standards” or “international harmonized explosion protection guideline 2015”?
It is determined by the manufacturer’s policies and the user’s request whether the electrical equipment should be designed, manufactured or tested based on which standard. Although any electrical equipment based on any of the standards can be certified, only one of the standards must be applied, and parts of both standards can not be applied. The type approval certificate issued (although there is a difference in the notation due to differences in standards) the form is the same, and the legal handling is the same.

As mentioned above, there are two standards, and the procedures may differ depending on each. Therefore, in our association, the reference materials such as the guidance for certification application will be useful to be useful for the certification application of explosion-proof electrical machine. We have prepared.