Marking of explosion-proof electrical equipment according to PIVRE

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3 (informative) to chapter 7.3. Marking of explosion-proof electrical equipment according to PIVRE

Electrical equipment manufactured according to PIVE is not subdivided into explosion protection levels.

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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The types of explosion protection of electrical equipment in the explosion protection marking are indicated by the same letters as according to PIVRE OAA.684.058-67 (see Appendix 2, clause 2).

The marking for explosion protection of electrical equipment in the following sequence includes:

a) designation of the type of explosion protection;

b) designation of the highest category of explosive mixture for which the electrical equipment is explosion-proof (according to Table A1.1), if the explosion protection of electrical equipment or its individual parts is provided by an explosion-proof enclosure; for electrical equipment with other types of explosion protection, which is explosion-proof for explosive mixtures of all categories, the number 0 is put instead of the designation of the explosive mixture category;

c) designation of the highest group of explosive mixture for which the electrical equipment is explosion-proof (according to Table A1.3).

For electrical equipment with protection type "e" (increased reliability against explosion) with sparking parts enclosed in a sheath filled with oil or purged under excessive pressure, instead of the number 0, the designation of the corresponding type of explosion protection is put: M or P.

For electrical equipment with the type of protection "intrinsically safe electrical circuit", the name of the combustible substance on which it was tested is indicated. The category and group designation for such electrical equipment is not affixed.

Examples of marking explosion-proof electrical equipment according to PIVE are given in Table. P3.1.

The level of "electrical equipment of increased reliability against explosion" includes electrical equipment that has the letter H in the explosion protection marking, as well as the number 2 before the letter I, for example:

MNB, NOG, H2A, NPA, NOA, , etc.

Electrical equipment with other explosion protection markings made according to PIVE should be classified as "explosion-proof electrical equipment".

Table A3.1. Examples of marking of explosion-proof electrical equipment according to PIVE

Type of explosion protection of electrical equipment	Category and group of explosive mixture for which electrical equipment is intended	Explosion protection marking
Flameproof shell	1st category, group A	V1A
	1st-3rd category, groups A, B and D	V3G
	All categories, group A	V4A
Oil filled shell and flameproof shell	1st-3rd category, group A	M3A
Oil-filled sheath and protection type "e"	All categories, groups A and B	MNB
Type "e" protection	All categories, groups A, B and D	H0G
Type "e" protection and flameproof enclosure	1st and 2nd categories, group A	H2A
Protection type "e" and filling or purging the enclosure under positive pressure	All categories and groups	Nap
Protection type "e" and oil filling of the shell	All categories and groups	NMD
Type "e" protection and intrinsically safe circuit	All categories, group A	H0A
Filling or purging the shell under positive pressure	All categories and groups	110D
Intrinsically safe electrical circuit and flameproof enclosure	1-3 categories, groups A, B and D
intrinsically safe electrical circuit	All categories and groups
Special type of explosion protection	All categories, groups A, B and D	С01
Special type of explosion protection and intrinsically safe electrical circuit	All categories and groups	S0D
Flameproof enclosure and intrinsically safe electrical circuit	1-3 categories, groups A, B and D

See other articles Section Rules for the installation of electrical installations (PUE).

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