This standard specifies the product classification, basic parameters, requirements, test methods, inspection rules, marking, packaging, transportation and storage of flameproof plugs (hereinafter referred to as plugs). This standard applies to the design, manufacture and inspection of plugs: plugs are used as connecting devices for cables and electrical equipment in factories or underground coal mines where the surrounding environment contains explosive gas mixtures and corrosive media. JB/T 4312-1999 Flameproof plugs JB/T4312-1999 Standard download decompression password: www.bzxz.net

JB4312-1999
This standard is a revision of JB4312-86 "Flameproof Plugs". 20003317
This standard cancels the structural dimension requirements of the socket and the plug rod in the original standard and increases the maximum matching clearance. At the same time, the technical requirements, test methods and inspection rules of the original standard are supplemented and modified to coordinate with the relevant major standards. This standard replaces JB4312-86 from the date of implementation. Appendix A, Appendix B and Appendix C of this standard are all appendices of the standard. This standard is proposed and managed by Shenyang Electric Drive Research Institute. The drafting units of this standard are: Shenyang Rongxin Explosion-proof Electric Appliance Factory, Dalian Switch Factory Branch, Xuzhou Explosion-proof Electric Appliance Factory, Kaifeng Explosion-proof Electric Appliance Factory, Shenyang North Explosion-proof Electric Appliance Factory, Datong Explosion-proof Electric Appliance Factory. The main drafters of this standard are: Di Hongyan, Bian Junwei, Zhang Jizhong, Yang Yuhang, You Chunshan, Hou Surong, Tian Yongfeng. This standard was first issued in November 1986 and revised for the first time in 1999. Shenyang Electric Drive Research Institute is entrusted with the interpretation of this standard. 15
Mechanical Industry Standard of the People's Republic of China
Flameproof Plug
JB4312-1999
Replaces JB4312-86
This standard specifies the product classification, basic parameters, requirements, test methods, inspection rules, marking, packaging, transportation and storage of flameproof plugs (hereinafter referred to as plugs). This standard applies to the design, manufacture and inspection of plugs. Plugs are used as connecting devices for cables and electrical equipment in factories or underground coal mines where the surrounding environment contains explosive gas mixtures and corrosive media. 2
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB191—1990
GB/T2423.4—1993
GB 3836.1—1983
GB 3836.2—1983
GB3836.3—1983
GB/T4942.2—1993
GB/T13384—1992
GB/T14048.1—1993
JB4262-1992
JB4324—1986
JB/T4375—1999
3 Product classification and basic parameters
3.1 Product classification
3.1.1 According to the place of use:
Packaging storage and transportation pictorial marking
Basic environmental test procedures for electrical and electronic products Test Db: Cyclic damp heat test Method
Explosion-proof electrical equipment for explosive gas atmosphereExplosion-proof electrical equipment for explosive gas atmosphereExplosion-proof electrical equipment for explosive gas atmosphereProtection degree of low-voltage electrical enclosure
General technical conditions for packaging of electromechanical productswwW.bzxz.Net
General provisions for low-voltage switchgear and control equipment
Rubber-sheathed cable entry device for explosion-proof electrical appliances
General requirements for chemical gas corrosion test methods for electrical products
Flameproof electrical equipment "d"
Increased safety electrical equipment "e\
Environmental conditions for outdoor and indoor corrosion sites of electrical productsa) Class 1: for use in coal mines;
b) Class II: for use in factories (including indoors and outdoors)3.1.2 According to the operation Structural classification:
a) Reversible (the plug of the plug can be inserted in two directions to change the phase sequence of the connected three-phase circuit or the rotation direction of the motor): b) Irreversible (the plug of the plug can only be inserted in one direction) 3.1.3 According to the installation method:
a) Mobile hanging type;
b) Fixed installation type.
Approved by the State Machinery Industry Bureau on August 6, 1999, 16
Implementation on January 1, 2000
3.1.4 According to the number of plug-in poles:
a) Two-pole (1P+)
b) Three-pole (2P+)
c) Four-pole (3P+);
d) Five-pole ( 3P+N+Ji);
e) Seven levels (2P+, 3P+)
According to the anti-corrosion performance:
a) Anti-light corrosion:
b) Anti-medium corrosion;
c) Anti-severe corrosion.
3.1.6 According to the voltage category:
a) AC;
b) DC.
3.2. Basic parameters
3.2.1 The rated frequency of the plug is: 50 (60) Hz. JB43121999
3.2.2 The rated current of the plug is: 10, 16, 20, 25, 31.5 (32), 50, 63, 100, 125, 160, 200A. 3.2.3 The rated voltage of the plug is:
AC: 36, 127, 220, 380, 660, 1140V. DC: 36, 48, 60, 110, 220, 400V. 3.2.4 The working system of the plug includes eight-hour working system and uninterrupted working system. 3.3 The matching dimensions of the socket and the plug of the conductive rod of the plug (including the dimensions of the conductive connecting bolt rod) shall comply with the provisions of Table 1. Table 1
Rated current
31.5 (32)
Nominal dimensions of sockets and plug rods
Maximum fit clearance
Dimensions of connecting bolt rods
JB4312-1999
4.1 In addition to complying with the provisions of this standard, plugs shall also comply with the relevant provisions of GB3836.1 and GB3836.2; and shall be manufactured in accordance with the prescribed procedures based on drawings and documents approved by the national quality supervision and inspection department, and may only be produced after obtaining the "explosion-proof certificate" issued by the inspection department.
Plugs shall be able to work reliably under the environmental conditions specified in Table 2. 4.2
Environmental conditions
Ambient air temperature
Relative air humidity
Explosive gas mixture
Significant vibration and severe impact
Rain and rainfall intensity
Solar radiation intensity
Ice, snow, ice, dew
Main chemical corrosive media in the air
(frequently or irregularly present)
Pollution degree
Installation category|| tt||Not more than
Not higher than
Not lower than
Not greater than
-20℃
95% (at +25℃)
Maximum rainfall intensity 6mm/min
1120W/m2
Maximum radiation intensity
Moderate corrosion or severe corrosion
Note: Moderate corrosion or severe corrosion contains the main chemical corrosive medium in the air according to the provisions of JB/T4375. The pin must be able to withstand the power frequency withstand voltage test specified in Table 3, and there should be no breakdown or flashover phenomenon for 1min. 4.3
Rated insulation voltage U
U,≤60
60
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