Standard No.:	MT/T 842-1999
English Name:	Coal mine gas-proportioning device (pressure method) specifications
Chinese Name:	煤矿用配气装置((分压法)技术条件
Chinese Classification:	D09    Hygiene, safety and labor protection
Professional Classification:	MT    Professional Standard - Coal
Source Content Issued by:	State Bureau of Coal Industry
Issued on:	1999-11-11
Implemented on:	2000-3-15
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	90.0
Delivery:	via email in 1 business day

1 Subject content and applicable scope This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transport and storage of communication and control equipment for underground mechanized mining face of coal mine (hereinafter referred to as communication and control equipment). It is applicable to communication and control equipment used in mechanized mining face and chute with explosive mixture. 2 Normative references GB 191 Packaging - Pictorial marking for handling of goods GB 3836 Electrical apparatus for explosive atmospheres GB 3836.1 Electrical apparatus for explosive atmospheres - General requirements GB 3836.2 Electrical apparatus for explosive atmospheres - Flameproof electrical apparatus “d” GB 3836.4 Electrical apparatus for explosive atmospheres - Intrinsically safe circuits and electrical apparatus i GB 3873 General specifications for products packaging of communication equipment GB 4942.2 Degrees of protection provided by enclosures for low-voltage apparatus GB 6388 Transport package shipping mark MT 209 General technical requirements of electric and electronic products used for communication, detection and control in coal mine MT 210 Basic testing methods for electric and electronic products used for communication, inspection and control of coal mine 3 Product classification 3.1 Classification 3.1.1 Classification by the use occasion a. communication and control equipment for thin coal seam face and chute conveyor lane; b. communication and control equipment for medium-thick coal seam face and chute conveyor lane; c. communication and control equipment for chute conveyor lane. 3.1.2 Classification by the function:

1 Subject content and applicable scope 2 Normative references 3 Product classification 4 Technical requirements 5 Test methods 6 Inspection rules 7 Marking, packaging, transport and storage Additional explanation