GB 3836.8-2014: Electrical apparatus for explosive gas atmospheres -- Part 8: Type of protection “n”

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Scope

This Part of GB 3836 specifies requirements for the construction, testing and marking
for Group II electrical equipment with type of protection, “n” intended for use in
explosive gas atmospheres. This Part applies to electrical equipment where the rated
voltage does not exceed 15 kV r.m.s. a.c. or d.c.
This Part of GB 3836 is applicable to non-sparking electrical equipment and also to
electrical equipment with parts or circuits producing arcs or sparks or having hot
surfaces which, if not protected in one of the ways specified in this Part, could be
capable of igniting a surrounding explosive gas atmosphere. This Part describes
several different methods, by which this can be achieved which may be combined with
other methods described in GB 3836.1-2010.
This Part supplements and modifies the general requirements of GB 3836.1-2010,
except as indicated in Table 1. Where a requirement of this Part conflicts with a
requirement of GB 3836.1-2010, the requirement of this Part takes precedence.
Table 1 -- Relationship of this Part to GB 3836.1-2010
Clause of GB 3836.1-2010 GB 3836.1-2010 Clause Application to GB 3836.8
GB 3836.1-
2010
(informative)
Clause / Subclause Title
(normative)
Protected
Sparking
nC
Non-
sparking
nA
Restricted
Breathing
nR
4 Equipment Grouping Applies Applies Applies
4.1 Group I Excluded Excluded Excluded
4.2 Group II Applies Applies Applies
4.3 Group III Excluded Excluded Excluded
4.4 Equipment for a Particular Explosive Atmosphere Applies Applies Applies
5.1 Environmental Influences Applies Applies Applies
5.1.1 Ambient Temperature Applies Applies Applies
5.1.2 External Source of Heating or Cooling Applies Applies Applies
5.2 Service Temperature Applies Applies Applies
5.3.1 Determination of Maximum Surface Temperature Applies Applies Applies
5.3.2.1 Group I Electrical Equipment Excluded Excluded Excluded
5.3.2.2 Group II Electrical Equipment Applies Applies Applies
5.3.2.3 Group III Electrical Equipment Excluded Excluded Excluded

Basic Data

Standard ID	GB 3836.8-2014 (GB3836.8-2014)
Description (Translated English)	Electrical apparatus for explosive gas atmospheres -- Part 8: Type of protection ��n��
Sector / Industry	National Standard
Classification of Chinese Standard	K35
Classification of International Standard	29.260.20
Word Count Estimation	57,528
Date of Issue	12/5/2014
Date of Implementation	10/16/2015
Older Standard (superseded by this standard)	GB 3836.8-2003
Quoted Standard	GB 755-2008; GB 1312-2007; GB/T 1406.1-2008; GB/T 1406.2-2008; GB/T 1406.3-2008; GB/T 1406.4-2008; GB/T 1406.5-2008; GB/T 2423.5-1995; GB 3836.1-2010; GB 3836.2-2010; GB 3836.3-2010; GB 3836.4-2010; GB 3836.9-2014; GB 3836.16-2006; GB/T 3956-2008; GB/T 42
Adopted Standard	IEC 60079-15-2010, MOD
Regulation (derived from)	Announcement of Newly Approved National Standards 2014 No. 27
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Standard specifies construction, testing and marking of II explosive atmosphere by the "n" type of protection of electrical equipment. This Standard is applicable to a rated voltage not exceeding 15kV DC or AC RMS electrical equipment. GB 3836's This