**Scope**
This standard outlines the safety requirements and inspection procedures for the selection, installation, use, and maintenance of electrical equipment in environments where explosive gases or flammable dust may be present. It is designed to ensure that such equipment is used safely in hazardous areas, minimizing the risk of ignition and subsequent explosions.
However, this standard does not apply to the following specific environments:
- Underground coal mines
- Sites involved in the manufacturing or processing of explosives
- Medical rooms
**Normative References**
The following documents contain provisions that become part of this standard through reference. For documents with a specified date, only the original version applies; subsequent amendments or revisions are not considered. However, all parties using this standard are encouraged to consider the latest versions of these referenced documents. For undated references, the most recent version applies.
Relevant standards include:
- GB3836.1-2000: General requirements for electrical apparatus in explosive gas atmospheres (equivalent to IEC 60079-0:1998)
- GB3836.3-2000: Increased safety "e" for explosive gas atmospheres (equivalent to IEC 60079-7:1990)
- GB3836.4-2000: Intrinsically safe "i" for explosive gas atmospheres (equivalent to IEC 60079-11:1999)
- GB3836.5-2004: Positive pressure enclosure "p" for explosive gas atmospheres (modified from IEC 60079-2:2001)
- GB3836.13-1997: Overhaul of electrical equipment in explosive gas atmospheres (equivalent to IEC 60079-19:1993)
- GB3836.14-2000: Classification of hazardous locations (identical to IEC 60079-10:1995)
- GB3836.15-2000: Electrical installations in hazardous areas (excluding mines) (identical to IEC 60079-17:2002)
- GB12476.1-2000: Electrical apparatus for flammable dust environments – Enclosure protection and limited surface temperature (identical to IEC 61241-1-1:1999)
- GB12476.2-2006: Selection, installation, and maintenance of electrical equipment in flammable dust environments (identical to IEC 61241-1-2:1999)
- GB/T 18380.1–18380.3-2001: Fire tests for cables under fire conditions (identical to IEC 60332)
- GB/T 14823.1-1993: Special requirements for metal conduits in electrical installations (equivalent to IEC 60614-2-1:1982)
- GB16895: Building electrical installations
- GB50058-1992: Code for design of electrical installations in explosion and fire hazardous environments
- IEC 60364: Electrical installations for buildings
- ISO 4225: General characteristics of air quality
**Terms and Definitions**
The following terms and definitions are applicable to this standard:
**13.1 Electrical Equipment / Electrical Apparatus**
Any device or component that uses electrical energy, including power generation, transmission, distribution, storage, measurement, regulation, conversion, and telecommunications equipment.
**13.2 Explosive Environment / Explosive Atmosphere**
A mixture of flammable gases, vapors, mists, or dust with air that can ignite and propagate combustion throughout the unburned mixture.
**13.3 Explosive Gas Environment / Explosive Gas Atmosphere**
An atmosphere containing flammable gases, vapors, or mists mixed with air, which can ignite and cause combustion throughout the entire mixture.
**13.4 Combustible Dust Environment / Combustible Dust Atmosphere**
An environment where a mixture of combustible dust or fibers with air can ignite and spread combustion.
**13.5 Hazardous Place / Hazardous Area**
An area where explosive atmospheres or flammable dust environments occur in sufficient quantities to require special precautions in the construction, installation, and use of electrical equipment.
**13.6 Non-Hazardous Place / Non-Hazardous Area**
An area where the presence of explosive gas or flammable dust is insufficient to require special precautions for electrical equipment.
**13.7 Normal Operation**
The operation of equipment that meets mechanical and electrical design specifications and functions within the manufacturer’s defined limits.
**13.8 Flameproof Enclosure**
An enclosure designed to withstand an internal explosion without causing an external ignition. Commonly referred to as "flameproof" and marked with the letter "d."
**13.9 Increased Safety "e"**
Design features that enhance the safety of electrical equipment by preventing arcs, sparks, and dangerous temperatures under normal operating conditions.
**13.10 Intrinsically Safe "i"**
Electrical circuits that cannot produce sparks or thermal effects capable of igniting an explosive atmosphere under normal or fault conditions.
**13.11 Positive Pressure Shell Type "p"**
An enclosure that maintains internal pressure above atmospheric levels to prevent the entry of explosive mixtures.
**13.12 Oil-Immersed Electrical Equipment "o"**
Equipment fully immersed in oil or another protective fluid to prevent ignition of surrounding explosive mixtures.
**13.13 Sand-Filled Electrical Equipment "q"**
An enclosure filled with sand or other material to prevent ignition of surrounding explosive mixtures during faults or overheating.
**13.14 Encapsulated Electrical Equipment "m"**
Equipment encapsulated in a potting compound to prevent ignition of surrounding explosive mixtures under normal or fault conditions.
**13.15 N-Type Electrical Equipment "n"**
Equipment that does not generate sparks or exceed maximum surface temperatures during normal or abnormal operation.
**13.16 Maintenance**
Activities performed to restore or maintain equipment to its intended functional condition according to technical specifications.
**13.17 Inspection**
Systematic examination of equipment to ensure it operates safely and reliably, often without disassembly or with minimal testing.
- **13.17.1 Visual Inspection**
A basic check using the naked eye to identify visible defects such as missing bolts.
- **13.17.2 General Inspection (Professional)**
Includes visual checks and the use of tools like ladders to detect loose components or structural issues.
- **13.17.3 Detailed Inspection**
Involves opening enclosures and using testing equipment to identify hidden defects, such as loose connections.
- **13.17.4 Initial Inspection**
Performed before equipment is put into service to ensure it meets all safety and operational requirements.
- **13.17.5 Periodic Inspection**
Regular checks conducted on all electrical equipment to ensure continued safe operation.
- **13.17.6 Continuous Supervision**
Ongoing monitoring and maintenance by trained professionals to ensure the equipment remains in safe working condition.
**13.18 Dust**
Solid particles suspended in the air, either by gravity or by being carried by air currents.
**13.19 Combustible Dust**
Dust that can form an explosive mixture when mixed with air at normal temperature and pressure.
**13.20 Conductive Dust**
Dust, fibers, or particles with a resistivity equal to or less than 1×10³ Ω·m.
**13.21 Dust Layer Minimum Ignition Temperature**
The minimum temperature required to ignite a dust layer on a hot surface.
**13.22 Dust Cloud Minimum Ignition Temperature**
The lowest temperature at which a dust cloud in a furnace will ignite.
**13.23 Dust Ignition Protection**
Measures taken to prevent dust or dust clouds from igniting, such as dust prevention and temperature control. This includes two types of equipment, A and B, both with equivalent protection levels.
**13.24 Dusttight Enclosure**
An enclosure that prevents all visible dust particles from entering.
**13.25 Dust-Protected Enclosure**
An enclosure that allows some dust ingress but ensures it does not interfere with safe operation.
**13.26 Maximum Surface Temperature**
The highest temperature that any part of the equipment may reach under the worst-case operating conditions, potentially leading to ignition.
**13.27 Permissible Maximum Surface Temperature**
The maximum temperature allowed for the surface of electrical equipment in actual operation to avoid igniting dust.
**13.28 Symbols "U" and "U"**
A symbol indicating that a product has been certified as an Ex element.
**13.29 Symbol "X"**
A symbol indicating that the equipment is suitable for use under specific conditions outlined in the explosion-proof certificate.
Material of Sliding bar:
Brass
Surface treatment
Chrome plated
Material of Shower Holder:
Solid Brass
size:
different sizes for selection
Quality guarantee:
5 years
Salty Test:
ASS 24H
Package:
Inner packing: bag, white/brown inner box
Outer packing: kraft carton
(The package also can be done as customer requirements.)
OEM/ ODM service:
laser logo on handle/body is available
Brass Sliding Kit,Sliding Kit,Bathroom Brass Sliding Kit,Brass Shower Sliding Kit
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