This standard specifies the product classification, basic parameters, requirements, instruction manuals, test methods, inspection rules, markings, packaging, transportation, storage, etc. of explosion-proof operating columns (hereinafter referred to as operating columns). This standard applies to the design, manufacture and inspection of explosion-proof and corrosion-proof operating columns with a rated working voltage of 380V and below. Operating columns are mainly used in explosive gas environments in factories or in surrounding corrosive gas environments to operate electromagnetic appliances at a distance, or to control the on, off, and conversion of signals and control circuits. They can also be used locally near the controlled motor to indirectly start, stop, and reverse the motor; operating columns equipped with ammeters and signal lights can also monitor and display the operation of the motor or the circuit status. JB/T 9648-1999 Explosion-proof operating column JB/T9648-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T9648-1999
Explosion-proof Operating Column
1999-08-06 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T9648-1999
This standard is a revision of ZBK35001-88 "Explosion-proof Operating Column for Commercial Use". This standard modifies some clauses in the requirements on the basis of the original standard, and adds technical parameters such as the protection level of the housing of the increased safety operating column, the temperature rise of the outdoor operating column, the electrical clearance of the operating column, and the creepage distance. This standard replaces ZBK35001-88 from the date of implementation. This standard is proposed and managed by Shenyang Electric Drive Research Institute. The main drafting units of this standard are: Shenyang Zhongxing Explosion-proof Electrical Appliance General Factory, Shenying Electrical Appliance Factory, State-owned Qidong Explosion-proof Electrical Appliance Instrument Factory, Wenzhou Liaoyuan Explosion-proof Electrical Appliance Co., Ltd., Zhejiang Feiyue Explosion-proof Electrical Appliance Manufacturing Co., Ltd. The main drafters of this standard are: Zhao Guilin, Qu Bo, Zhang Shujie, Gao Feng, Li Linsong, Xu Yuedi
This standard was first issued in 1988 and revised for the first time in 1999. This standard is entrusted to Shenyang Electric Drive Research Institute for interpretation. 1 Scope
Machinery Industry Standard of the People's Republic of China
Explosion-proof Operating Column
JB/T 9648 - 1999
Replaces ZBK35001-1988
This standard specifies the product classification, basic parameters, requirements, instruction manual, test methods, inspection rules, marking, packaging, transportation, storage, etc. of explosion-proof operating columns (hereinafter referred to as operating columns). This standard applies to the design, manufacture and inspection of explosion-proof and corrosion-proof explosion-proof operating columns with a rated working voltage of 380V and below. The operating column is mainly used in explosive gas environments in factories or in corrosive gas environments. It can operate electromagnetic appliances remotely, or control the on, off and conversion of signal and control circuits. It can also start, stop and reverse the motor locally and indirectly near the controlled motor. The operating column equipped with an ammeter and a signal light can also monitor and display the operation of the motor or the circuit. Reference 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 the parties using this standard should explore the possibility of using the latest versions of the following standards. GB3836.1-—1983
GB3836.2-1983
GB3836.3—1983
GB/T4942.2—1993
GB 9969.11998
GB/T13384—1993
General requirements for explosion-proof electrical equipment for explosive atmospheres Explosion-proof electrical equipment for explosive atmospheres Flameproof electrical equipment "d" Explosion-proof electrical equipment for explosive atmospheres Increased safety electrical equipment "e" Protection level of low-voltage electrical enclosures
General provisions for industrial product instruction manuals
General technical conditions for packaging of electromechanical products
GB/T14048.1-1993 General provisions for low-voltage switchgear and controlgear JB/T3139—1991
JB4324—1986
JB/T4375—1999
3 Product classification
3.1 Classification
3.1.1 According to the place of use
a) Indoor use;
b) Outdoor use.
3.1.2 According to the anti-corrosion performance, it is divided into bzxZ.net
a) light anti-corrosion;
b) medium anti-corrosion;
c) heavy corrosion.
Model compilation method of explosion-proof electrical products
Chemical gas corrosion test method of electrical products Environmental conditions for outdoor and indoor corrosion sites of electrical products Approved by the State Bureau of Machinery Industry on August 6, 1999 and implemented on January 1, 2000
3.1.3 According to the explosion-proof form, it is divided into
a) flameproof type;
b) increased safety type;
c) composite type.
3.2 Basic parameters
Rated working voltage: 380V and below.
Rated working current: 6.3, 10, 16A. 3.3 Product model
JB/T9648-1999
The product model of the operating column shall be compiled according to the requirements of JB/T3139, and the application shall be submitted according to the prescribed procedures. After the approval of the competent approval unit, it shall be determined in the product technical conditions. 4 Requirements
4.1 The operating column shall be manufactured according to the prescribed procedures with drawings and documents approved by the nationally recognized quality supervision and inspection department, and shall be produced only after obtaining the "explosion-proof certificate" issued by the inspection department. 4.2 In addition to complying with this standard, other components on the operating column shall also comply with the provisions of their respective product standards. 4.3 Normal working conditions (see Table 1).
Table 1 Working conditions
Environmental conditions
Ambient air temperature
Relative air humidity
Not exceeding
Not higher than
Not lower than
Not greater than
Explosive gas mixture
Rain and rainfall intensity
Solar radiation intensity
Ice, snow, frost, dew
Significant shaking and severe impact vibration
Main chemical corrosive media in the air (frequently or irregularly present)
4.4 Structural requirements
Indoor explosion-proof
None or slight
Form of operating column
Indoor corrosion and explosion-proof
+40℃
-20℃
Outdoor explosion-proof
95% (+ 25%)
Yes or only in accident situations
Outdoor corrosion and explosion protection
Maximum rainfall intensity: 60mm/10min
Maximum radiation intensity: 1120W/m
4.4.1 When the operating column shell is made of aluminum alloy, the tensile strength of the shell material shall not be less than 120MPa, and the magnesium content shall not be greater than 0.5% (weight ratio); when a plastic shell is used, the shell shall meet the following requirements a) its surface insulation resistance value shall not be greater than 1×10°α; b) it shall be made of non-combustible or flame-retardant materials; c) it shall withstand the impact test specified in 21.1 of GB3836.1-1983 and the thermal stability test specified in 24.2 4.4.2 A clear, permanent embossed mark "Ex" and a warning sign with the words "open the cover after power off" shall be set at a conspicuous place on the operating column shell. 2
JB/T9648-1999
4.4.3 The flameproof parameters of the flameproof enclosure of the operating column shall comply with the provisions of Chapter 6 of GB3836.21983. 4.4.4 The minimum electrical clearance and creepage distance of the operating column and the wiring chamber shall comply with the provisions of Chapter 5 and Chapter 6 of GB3836.3--1983, and the main chamber shall not be less than the provisions in Table 2.
Table 2 Electrical clearance and creepage distance in the main chamber
Rated voltage V
Electrical clearance mm
4.4.5 All ferrous metal parts of the operating column shall be galvanized and passivated or made of stainless steel. 4.4.6 All fasteners of the operating column shall have measures to prevent them from loosening. Distance of fat electricity mm
4.4.7 For operating columns with anti-corrosion requirements and outdoor types, the exposed fasteners and nameplates shall have protective measures in design and process. 4.4.8 The transparent parts of the operating column shall be able to withstand the impact test of 4J. After the test, the transparent parts shall not be damaged or have permanent deformation that affects the explosion-proof performance.
4.4.9 The flameproof surface of the flameproof operating column shall have anti-rust measures, and it is allowed to apply anti-rust oil that can prevent rust and ensure flameproof performance. 4.4.10 The operating column housing shall be equipped with internal and external grounding bolts (except plastic housing) and marked with the grounding symbol "言". The specifications of the grounding bolts shall comply with the provisions of Chapter 15 of GB3836.1-1983. For operating columns with moderate corrosion and severe corrosion resistance, the grounding bolts shall be made of stainless metal materials or have reliable anti-corrosion measures. 4.4.11 For operating columns used outdoors, the characteristics of sufficient outdoor light should be taken into consideration, and corresponding measures should be taken to ensure that the signal lights are clearly displayed. 4.5 Performance requirements
4.5.1 The flameproof enclosure of the operating column must be able to withstand the water pressure test of 1MPa for Class II B and 1.5MPa for Class IIIIC as specified in Chapter 19 of GB3836.2-1983, which lasts for 1 minute and is qualified if there is no continuous dripping (one drop of water every interval greater than 10 seconds is considered as discontinuous dripping). 4.5.2 For the anti-corrosion type operating column, after the chemical gas corrosion test, the insulation resistance between the shell and the live parts and the mutually insulated live parts shall not be less than 1M2, and shall meet the following requirements: a) The conductive, electromagnetic and structural metal parts in the shell shall not show obvious corrosion, such as copper rust and iron rust; b) The coating on the surface of the shell shall not be soft and wrinkled, and no corrosion points shall appear; c) The insulating materials, plastic parts and sealing gaskets shall not have delamination, blistering, deformation, brittle cracking and stickiness; d) The exposed fasteners and nameplates shall not be corroded. 4.5.3 The aging resistance of the rubber materials of the sealing ring and sealing gasket of the operating column shall comply with the provisions of Chapter 29 of GB3836.1--1983. 4.5.4 The torsion performance of the operating column connector shall comply with the provisions of Chapter 23 of GB3836.1-1983: 4.5.5 The clamping performance and sealing performance of the operating column cable entry device shall comply with the relevant provisions of Chapter 27 of GB3836.1-1983 and Chapter 21 of GB3836.2-1983
4.5.6 The operating column shall be able to withstand the power frequency withstand voltage test listed in Table 3, and there shall be no breakdown or flashover phenomenon for 1 minute. 4.5.7 The electrical life and mechanical life of the operating column and the breaking capacity of the switch shall not only comply with the standards of the electrical components themselves, but also comply with the relevant provisions of GB/T14048.1.
4.5.8 The flameproof performance of the flameproof operating column shall comply with the relevant provisions of Chapter 20 of GB3836.2--1983. 3
Rated insulation voltage Ui
60
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