NB/T 11631-2024Explosion proof dual power switching switch used for auxiliary fans used for mine (English PDF)

Preface

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

1 Scope

This document specifies the classification and model naming, special features, and specifications of explosion-proof dual power transfer switches (hereinafter referred to as "transfer switches") for local ventilation fans in coal mines. performance, normal working conditions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage.

This document is applicable to the control of dual power supply of local ventilation fans in coal mines, in AC 50 Hz, voltage 1 140 V and below lines. A switch for line switching and circuit protection.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document. document.

GB/T 191 Pictorial markings for packaging, storage and transportation

GB/T 2423.4 Environmental testing for electric and electronic products Part 2: Test method Test Db Cyclic damp heat (12 h 12 h cycle)

GB/T 2900.18 Electrical terminology - Low voltage electrical appliances

GB/T 2900.35 Electrical terminology - Explosive atmospheres

GB/T 3836.1-2021 Explosive atmospheres Part 1: General requirements for equipment

GB/T 3836.2-2021 Explosive atmospheres Part 2: Equipment protected by flameproof enclosure "d"

GB/T 3836.3 Explosive atmospheres Part 3: Equipment protected by increased safety "e"

GB/T 3836.4-2021 Explosive atmospheres Part 4: Equipment protected by intrinsic safety type "i"

GB/T 4205 Basic and safety rules for human-machine interface signs and symbols Operating rules

GB/T 4208-2017 Degrees of protection provided by enclosures (IP Code)

GB/T 14048.1-2023 Low-voltage switchgear and controlgear Part 1: General

GB/T 14048.3-2017 Low-voltage switchgear and controlgear Part 3: Switches, isolators, disconnectors and fuse groups Electric

GB/T 14048.4-2020 Low-voltage switchgear and controlgear Part 4-1.Electromechanical contactors and motor starters Contactors and motor starters (including motor protectors)

GB/T 14048.5 Low-voltage switchgear and controlgear Part 5-1.Control circuit devices and switching elements Electromechanical control circuits Road Electric

AQ 1043 Mining Product Safety Signs and Labels

MT/T 111-2011 Explosion-proof low-voltage AC vacuum electromagnetic starter for mining

MT/T 154.2 Method for compiling model numbers of electromechanical products for coal mines Part 2: Method for compiling model numbers of electrical products

MT/T 175 Electronic protector for explosion-proof electromagnetic starter for mining

MT/T 661-2011 General technical requirements for electrical equipment used in underground coal mines

3 Terms and definitions

The terms and definitions defined in GB/T 14048.1, GB/T 2900.18, GB/T 2900.35 and the following apply to this document.