GB 30000.1-2024 Explosive atmospheres — Part 15: Specification of electrical installations design, selection and erection
1 Scope
This document specifies the specific requirements for the design, selection, erection and initial inspection of electrical installations in, or associated with, explosive atmospheres.
This document is applicable to all electrical equipment including fixed, portable, transportable and personal, and installations.
This document is not applicable to:
— underground coal mine (the design, selection and installation of electrical installations in underground coal mine can refer to this document);
Note 1: See Safety Regulations for Coal Mine for specific requirements.
— inherently explosive situations and dust from explosives or pyrophoric substances (for example explosives manufacturing and processing);
— rooms used for medical purposes;
Note 2: Additional guidance on the requirements for hazards due to hybrid mixtures of dust or flyings and flammable gas or vapour is provided in Annex A.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3836.1 Explosive atmospheres - Part 1: Equipment - General requirements
GB 3836.16 Explosive atmospheres - Part 16: Electrical installations inspection and maintenance
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3836.1 and the following apply.
3.1 general
3.1.1
competent body
organization which can demonstrate appropriate technical knowledge and relevant skills to make the necessary assessments of the safety aspect under consideration
3.1.2
verification dossier
set of documents showing the compliance of electrical equipment and installations
3.1.3
electrical equipment
items applied as a whole or in part for the utilization of electrical energy
Note: These include, amongst others, items for the generation, transmission, distribution, storage, measurement, regulation, conversion and consumption of electrical energy and items for telecommunications.
3.2 hazardous areas
3.2.1
hazardous areas
area in which an explosive atmosphere is present, or may be expected to be present, in quantities such as to require special precautions for the construction, installation and use of equipment
Note: For the purposes of this document, an area is a three-dimensional region or space.
3.2.2
non-hazardous area
area in which an explosive atmosphere is not expected to be present in quantities such as to require special precautions for the construction, installation and use of equipment
3.2.3
equipment grouping
classification of electrical equipment related to the explosive atmosphere for which it is to be used
Note: Electrical equipment for use in explosive atmospheres is divided into three groups:
— Group I: electrical equipment for mines susceptible to firedamp;
— Group II (which can be divided into subgroups): electrical equipment for places with an explosive gas atmosphere, other than mines susceptible to firedamp;
— Group III (which can be divided into subgroups): electrical equipment for places with an explosive dust atmosphere.
3.2.4
hybrid mixture
mixture of a flammable gas or vapour with a combustible dust
3.2.5
maximum permissible surface temperature
highest temperature that a surface of electrical equipment is allowed to reach in practical service to avoid ignition
Note: This definition applies only to dust and does not apply to gases. The maximum permissible surface temperature will depend upon the type of dust, whether as a cloud or layer, including layer thickness and the application of a safety factor (see 5.4.3).
3.2.6
zones
hazardous areas classified into zones based upon the frequency of the occurrence and duration of an explosive atmosphere
Foreword II
Introduction VII
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Design and selection of electrical equipment
6 Equipment installation
7 Additional requirements
8 Initial inspection
Annex A (Informative) Hybrid mixtures
Annex B (Normative) Initial inspection – Equipment-specific inspection schedules
Annex C (Nominative) Potential stator winding discharge risk assessment – Ignition risk factors
Bibliography
