This standard specifies the terms and definitions, classification and naming, characteristics, structural and performance requirements, test methods, inspection rules, marking, packaging, transportation, and storage of explosion-proof low-voltage AC vacuum electromagnetic starters (hereinafter referred to as starters) for mining purposes. This standard is applicable to starters for direct or remote starting and stopping, reversing, and variable speed control of three-phase squirrel cage asynchronous motors in circuits with a rated frequency of 50Hz and a voltage of 1140V (1200V) and below in coal mines, while protecting the motor and related circuits. The provisions of this standard regarding overload protection do not apply to embedded overheating protection devices installed inside the motor. The clauses in the following documents are referred to as provisions of this standard through normative references. For dated references, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, it is encouraged for all parties who have reached agreements based on this standard to investigate whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T 156-2007 Standard Voltage (IEC 60038:2002, MOD) GB/T 191 Packaging, Storage and Transport Graphical Symbols (GB/T 191-2008, ISO 780:1997, MOD) GB/T 762 Standard Current Levels (GB/T 762-2002, IEC 60059:1999, EQV) GB/T 2423.4-2008 Environmental Testing of Electrical and Electronic Products - Part 2: Test Methods - Test Db: Alternating Damp Heat (12h+12h Cycle) (IEC 60068-2-30:2005, IDT) GB/T 2900.18-2008 Electrotechnical Terminology - Low Voltage Electrical Appliances GB/T 2900.35-2008 Electrotechnical Terminology - Equipment for Explosive Atmospheres (IEC 60050-426:2008, IDT) GB 3836.1-2000 Electrical Equipment for Explosive Gas Atmospheres Part 1: General Requirements (eqv IEC 60079-0:1998) GB 3836.2-2000 Electrical Equipment for Explosive Gas Atmospheres Part 2: Flameproof "d" (eqv IEC 60079-1:1990) GB 3836.3-2000 Electrical Equipment for Explosive Gas Atmospheres Part 3: Increased Safety "E" (eqv IEC 60079-7:1990) GB 3836.4-2000 Electrical Equipment for Explosive Gas Atmospheres, Part 4: Intrinsically Safe Type "i" (eqv IEC 60079-11: 1999) GB/T 4026 Basic Methods and Safety Rules for Marking and Identification of Human Machine Interfaces, General Rules for the Application of Equipment Terminals and Specific Conductor Terminals, and Alphanumeric Systems (GB/T 4026-2004, IEC 60445-1999, IDT) GB/T 5590-2008 Mining Explosion-proof Low Voltage Electromagnetic Starters GB/T 10111-2008 Generation of Random Numbers and Its Application in Product Quality Sampling Inspection GB 14048.1-2006 Low Voltage Switchgear and Control Equipment, Part 1: General (IEC 60947-1:2001, MOD) GB 14048.4-2003 Low Voltage Switchgear and Control Equipment Electromechanical Contactors and Motor Starters (IEC 60947-4-1:2000, IDT) GB 14048.5-2008 Low Voltage Switchgear and Control Equipment - Part 5-1: Control Circuit Electrical Appliances and Switching Elements - Electromechanical Control Circuit Electrical Appliances (IEC60947-5-1:2003, MOD) MT/T 154.2 Method and Management Method for Product Model Selection of Electrical Equipment Used in Coal Mines MT 175-1988 Electronic Protectors for Mining Flameproof Electromagnetic Starters MT/T 412 Flameproof Electrical Equipment Low Voltage Wiring Terminals
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