JB/T 5554-1991 Combination switch JB/T5554-1991 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5554-1991bzxZ.net
Combination switch
Published on July 9, 1991
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Combination switch
JB/T5554-1991
This standard refers to the International Electrotechnical Commission standard IEC408 (1972), IEC408, Amendment No. 1 (1979) and No. 2 (1989) "Low-voltage air switch disconnectors, disconnectors and fuse combination appliances". Subject content and scope of application
This standard specifies the basic parameters, technical requirements, test methods, inspection rules, etc. of combination switches. This standard applies to combination switches (hereinafter referred to as switches) that connect or disconnect circuits, change circuits, start, change, stop and change speed of motors in circuits with an AC 50Hz rated voltage of up to 660V or a DC rated voltage of up to 660V and a rated current of up to 100A. 2 Reference standards
GB1497
GB2828
GB2900.18
JB4012
GB4207
GB5226
Basic test methods for low-voltage electrical appliances
Basic standards for low-voltage electrical appliances
Basic environmental test procedures for electrical and electronic productsTest Db: Alternating damp heat test methodBatch inspectionCount sampling procedures and sampling tablesElectrical terminologyBasic terminology
Electrical terminology||t t||Low-voltage electrical appliances
Low-voltage air-type isolators, disconnectors and fuse combination electrical appliances, determination methods for the tracking index and the resistance tracking index of fixed insulating materials under humid conditions, protection levels of low-voltage electrical enclosures
Fire hazard test for electrical and electronic products, glow-wire test methods and guidelines, general technical requirements for machine tool electrical equipment
3 Terms, symbols and codes
The terms, symbols and codes used in this standard shall comply with the relevant provisions of GB1497, GB2900.1 and GB2900.18. 4 Product classification
4.1 Classification
4.1.1 According to use:
Power on-off switch;
Two power supply circuit conversion switch;
AC and DC motor control switch.
According to installation method:
Front-panel installation
Back-panel installation;
Others.
4.2 Parameters and dimensions of the switch
Approved by the Ministry of Machinery and Electronics Industry on July 9, 1991 and implemented on July 1, 1992
Rated voltage
Rated working voltage (U.);
Rated insulation voltage (U).
4.2.2 Current
Conventional thermal current (la),
Conventional enclosed thermal current (1);
Rated working current (1.).
4.2.3 Overall dimensions and installation dimensions
JB/T5554-1991
The overall dimensions and installation dimensions of the switch shall comply with the specific product standards. 5 Technical requirements
5.1 Normal working conditions and installation conditions
5.1.1 Ambient air temperature
The upper limit of the ambient air temperature shall not exceed +40℃, a.
b. The average value of the ambient air temperature for 24 hours shall not exceed +35℃; c. The lower limit of the ambient air overflow shall not be lower than -5℃. 5.1.2 Altitude
The altitude of the installation site shall not exceed 2000m.
For switches used at higher altitudes, the user shall consult with the manufacturer. 5.1.3 Atmospheric conditions
The relative humidity of the atmosphere shall not exceed 50% when the ambient air temperature is +40℃. Higher relative humidity can be achieved at lower temperatures. The monthly average maximum relative humidity of the wettest month shall be 90%, and the monthly average minimum temperature of the month shall be +25, and condensation on the surface of the product due to temperature changes shall be taken into account.
5.1.4 Pollution level
Unless otherwise specified in the product standard, the pollution level is level 3. 5.1.5 Installation conditions
Normal installation conditions shall be based on the manufacturer's installation instructions. For switches with specified installation orientation or whose switch performance is significantly affected by installation conditions, the installation conditions shall be clearly specified in the specific product standards. 5.1.6 Installation category
The installation category of the switch is Class II or Class II. 5.1.7 Working system
Long-term working system;
Eight-hour working system;
Intermittent cycle working system,
5.1.8 Shock and vibration
The relevant shock and vibration conditions are specified in the specific product standards or negotiated by the user and the manufacturer. 5.2 Structural requirements
5.2.1 The structural materials of the switch shall meet the relevant application requirements and pass the corresponding tests on the product after the product is constructed. For example, the terminal block machine is subjected to strength test, fire hazard test, comparative tracking index (CTI) determination of insulating materials, etc. 5.2.2 General requirements
a. All ferrous metals of the switch should have a reliable protective layer; the surface of plastic parts should be smooth and free of deformation, cracking, severe scratches, bubbles, etc.; b.
The wiring terminals of the switch should have clear and durable marks for identification; c.
The metal shell of the switch should have protective wiring terminals, and should be marked with graphic symbols or letter symbols; d.
JB/T5554-1991
The protective wiring terminals should be placed in a place that is easy to connect, and when the shell or other movable parts are removed, the switch can still maintain ground connection;
Mark;
When used as a power switch, all parts with power supply voltage must be covered to prevent electric shock, and the cover must have a warning of live electricity. The indication angle of the handle, the connection line, and the opening and closing state of the contacts must meet the requirements of the product drawings. 5.2.3 Electrical room
The minimum electrical room image value of the switch is shown in Table 1.
Relative voltage determined by the rated system voltage
Relative voltage to ground
(AC effective value or DC value)
100150
150
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