Some standard content:
ICS47.020.60
Machinery Industry Standard of the People's Republic of China
JB/T5791-—2002
Replaces JB/T5791—1991
Marine Combination Switch
Rotary Switch for Ship
Published on 2002-07-16
Implemented on 2002-12-01
Published by the State Economic and Trade Commission of the People's Republic of China Foreword,
Normative Reference Documents
Terms and Definitions, Symbols, Codes
Models and Classifications
4.1 Product Models and Their Meanings
Type and classification,
4.3 Appearance and installation dimensions of the switch
Normal working conditions
Technical requirements,
7.1 Basic parameters
7.2 Structural requirements
7.3 Performance requirements.
Test methods.
General inspection
8.2 Performance test..
Inspection rules.…
Test classification
Type test of switch
Factory test..
Packaging, transportation and storage
Schematic diagram of handle operating torque measurement
Normal working conditions
Rated working current,
Operating torque.
Electrical clearance and creepage distance
Appearance of metal parts
Tightening torque of screw-type terminals for mechanical strengthImpact withstand voltage test value
Temperature rise limit of the adjacent parts of the terminals, wet heat test parameters..
Rated making and breaking capacity test circuit parametersVerification operation performance test circuit parameters
Rated short-circuit withstand current test value
Rated short-circuit making capacity test value
Vibration test parameters.
Test temperature and time at the top of the glow wire.
Terminals during the test Wire cross-sectional area.
Connecting wire
JB/T5791-2002
JB/T5791—2002
This standard is based on GB/T3783—1994 "Basic requirements for marine low-voltage electrical appliances", GBT14048.1—2000 "General rules for low-voltage switchgear and controlgear" and GB14048.3-1993 "Low-voltage switchgear and controlgear low-voltage switch, isolator, isolator and fuse combination electrical appliances", and revised JBT5791-1991 "Marine combination switch". This standard refers to the publication No. C60092 "Marine electrical equipment" 101: Definitions and general provisions, 201: General rules for system design and IEC60408 (1972) "Low-voltage air switch, air isolator, air isolator and fuse combination electrical appliances" (first edition).
The main technical performance indicators and test methods are in accordance with the relevant provisions of GB/T3783-1994, GB/T14048.1-2000 and GB14048.3-1993.
Compared with JB/T5791-1991 "Marine Combination Switches", the main changes in technical performance of this standard are as follows: - Considering the interests of the manufacturer, no specific regulations are made for the derived series code of the product, but for the marine combination switches with shell protection, the product name is allowed to use the original name, and the shell protection level should meet the requirements of this standard, such as: marine airtight combination switch. The overall dimensions and installation dimensions of the marine combination switch can be specified by the manufacturer. - For the rated short-circuit current test of the combination switch for marine use and RL96--25.63.100 fuse, according to the provisions of Table 13 in GB14048.3-1993, if the switch is subjected to test procedure 3 (short-circuit performance), then test procedure 4 (limited short-circuit current) does not necessarily need to be carried out, so this test is exempted. - For 10A marine combination switches whose electrical clearance and creepage distance do not meet the standards, a 6000V impulse withstand voltage test is required. Since GB/14048.1-2000 "General Rules for Low-voltage Switchgear and Control Equipment" has replaced GB/T14048.1-1993, this standard and its related clauses have also been changed accordingly, and the provisions for periodic testing have been cancelled. This standard replaces JBT5791-1991.
This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of Shanghai Electric Science Institute. This standard is drafted by Shanghai Lixin Electric Factory. The main drafters of this standard are Shen Meiling and Xue Chuanjin. This standard was first issued in June 1991.
1 Scope
Marine combination switch
JB/T5791--2002
This standard specifies the model, specification, mark, normal working conditions, technical requirements, test, packaging, transportation and storage of marine combination switch. This standard applies to HZ910 series marine combination switch (hereinafter referred to as switch), which is installed on ships and used for manual infrequent connection or disconnection of circuits and switching circuits in electrical circuits of AC 50Hz (or 60Hz), 380V and below, DC 220V and below. Generally, it cannot directly start the motor and cut off the short-circuit current. Only 10A, 25A and other switches can control small-capacity motors. Note: AC 440V.660V switches can refer to this standard for implementation, and the relevant performance requirements are determined by the manufacturer and the user through negotiation. 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this standard. Environmental testing for electric and electronic products Part 2: Test methods Test A: Low temperature (idtECGB/T2423.1—2001
60068-2-1:1990)
Environmental testing for electric and electronic products Part 2: Test methods Test B: High temperature (eqvIECGB/T2423.2--2001
60068-2-2:1974)||tt ||GB/T2423.4-1993 Basic environmental testing procedures for electric and electronic products Test Db: Cyclic damp heat test method (eqvEC60068-2-30:1980)
GB/T2423.16-1999
60068-2-10:1988)
Electrical and electronic products environmental testing Part 2: Test methods Test J and guidelines: Long recommendation ( idtEC Basic Environmental Test Procedures for Electrical and Electronic Products Test Ka: Salt Spray Test Method (eqvEC GB/T2423.17-1993
60068-2-11:1981)
Batch Inspection Count Sampling Procedure and Sampling Table (Applicable to Inspection of Continuous Batch) GB/T2828—1987
GB/T2900.18—1992 Electrical Terminology Low Voltage Electrical Appliances (eqvEC60050-441:1984) Basic Requirements for Marine Low Voltage Electrical Appliances (neqIEC60971-1) GB/T37831994
Determination Method of Comparative Tracking Index and Proof Tracking Index of Solid Insulating Materials under Wet Conditions GB/T4207-19841
(neqIEC60112:1979)
GB/T 4942.2--1993
Degrees of protection of low-voltage electrical enclosures (eqvIEC60947-1:1988) Fire hazard test for electric and electronic products Test methods Glow-wire test methods General rules (idtECGB/T5169.10-1997
60695-2-1/0:1994)
Fire hazard test for electric and electronic products Test methods Glow-wire test and guidelines for finished products (idtCGB/T5169.11-1997
60695-2-1/1;1994)
Vibration (sinusoidal) test method for marine electrical equipment (negEC60092) GB/T7094-1986
GB14048.1-2000 General rules for low-voltage switchgear and controlgear (eqvC60947-1:1999) GB14048.3--1993 Low-voltage switchgear and controlgear Part 3: Low-voltage switches, isolators, disconnectors and fuse combinations (eqvEC60947-3:1990) 3 Terms and definitions, symbols, codes
CB/T2900.18 and GB14048.The terms and definitions, symbols and codes established in 3 are applicable to this standard. JB/T5791—2002
4 Models and classifications
4.1 Product models and their meanings
Product models and their meanings are as follows:
4.2 Models and classifications
4.2.1 Classification by protection type
4.2.1.1 With protective casing
a) Waterproof type:
b) Food
protective type.
Without protective casing
Wired type before the board:
Wired type behind the board.
4.2.2 According to the purpose
a) Direct
Single power switch:
b) Dual power or dual circuit switch:
Triple power or three circuit switch:
d) Switch for controlling small capacity motor.
4.2.3 According to the number of poles
a) Single pole:
b) Two poles;
c) Three poles:
d) Four poles.
4.3 The appearance and installation dimensions of the switch
are specified by each manufacturer.
5 Marking
5.1 The switch nameplate shall indicate the following:
a). Product model and name;
b) Manufacturer name or registered trademark:
c) Rated voltage and rated current:
d) Switch position:
e) Ship inspection mark.
Auxiliary specification code: Indicates the number of poles
“P” indicates two power conversions; “s” indicates three power conversions. Basic specification code: Indicates the derived series code with rated working current
Design code, the first digit “9” indicates the marine group code: Combination switch
Note: Items a), b), c), and d) must be marked on the switch nameplate, and e) may be marked on other parts of the product or in the product technical documents. 5.2 The switch conversion position is used as a mark to indicate the closed or open position of the switch contact. 2
Normal working conditions
JB/T5791—2002
The switch can work normally under the environmental conditions specified in Table 1. If the conditions exceed those in Table 1, the supplier and buyer shall make a special order agreement to solve the problem.
Environmental conditions
Maximum ambient air temperature
Minimum ambient air temperature
Influence of humid air at sea
Influence of salt
Influence of mold
Influence of oil shoots
Installation category
Installation conditions
Normal working conditions
Rated data
40℃*
-25℃b
Pollution level
+40℃Mainly suitable for electrical appliances used in coastal and inland ships. Special consideration shall be given to places with a temperature higher than 45℃. Mainly suitable for electrical appliances installed on open decks and open deck cabins without insulation measures. Special consideration should be given to places below -25°C. "Refers to the impact generated during normal operation of seagoing vessels. Technical requirements
The switch shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved in the prescribed procedures. 7.1 Basic parameters
7.1.1 Rated frequency
50Hz (or 60Hz).
7.1.2 Rated working voltage
a) AC 380V;
b) DC 220V.
7.1.3 Rated working current
The rated working current of the switch is shown in Table 2.
Rated working voltage
Rated working current
Table 2 Rated working current
Note: When the single-pole switch has an AC voltage of 380V and a DC voltage of 220V, the working current drops to 6 0% of the rated working current. Rated working system
a) Long-term working system:
b) Repeated short-time working system.
7.2 Structural requirements
7.2.1 The switch has reliable indication marks to indicate the closing and opening of contacts. The disconnected position is indicated by the symbol "0\", and the closed position is indicated by the symbol \", 3
JB/T5791—2002
"I", "III", "IV". 7.2.2 The rotating part of the switch should be flexible and reliable, and the mechanism of the switch should enable the contacts to be placed in the closed or open position only. The operating torque acting on the switch handle should not be greater than that specified in Table 3. 7.2.3
Table 3 Operating torque
. Rated working current A||tt| |The electrical clearance and creepage distance of the switch shall not be less than the provisions in Table 4. 7.2.4
Rated working current AWww.bzxZ.net
Table 4 Electrical clearance and creepage distance
Electrical clearance
Note: The impact withstand voltage test shall be carried out according to the requirements of Table 7. 7.2.5
All solid connections of the switch shall not automatically loosen or become loose. Operating torque N·m
Creep distance
7.2.6 All metal parts of the switch (except friction parts) shall have a reliable anti-corrosion layer. The switch shall have salt spray resistance, that is, the appearance changes of the metal plated parts of the switch exposed to the air after 48h salt spray test shall meet the qualified requirements specified in Table 5.
Table 5 Appearance of metal parts| |tt||Coating category
Copper+chrome
Parts material
Copper and copper alloy
Copper and copper alloy
Qualification requirements
No white or gray-black corrosion on the main surfaceNo light green corrosion on the main surface
No green on the main surface
All insulating parts of the switch should be smooth and beautiful, and there should be no cracks, obvious bubbles, deformation and other defects on the surface. 7.2.7
The insulating parts of the switch should generally be made of durable, flame-retardant, moisture-resistant and mildew-resistant materials: a)
The switch should have mildew-resistant performance, that is, the insulating parts of the switch exposed to the air, after the long test, the mildew area does not exceed the 2nd level specified in GB/T2423.16-1999. The insulating material used in the switch should be higher than or equal to Ib, and its comparative tracking index (CTI value) should be greater than 100. The heat resistance of the insulating material of the switch shall withstand the fire hazard test specified in 8.1.9.4 of this standard without causing combustion. d)
7.2.8 The switch shall have a terminal for external wires. The tightening torque of the terminal screws shall comply with the specified value in Table 6. It shall be able to compress and not damage the terminal and the wire.
Rated working current
Tightening torque of mechanical strength of threaded terminal Table 6
Screw diameter
Tightening torque N·m
Terminals are commonly used to clamp a single wire, but are also suitable for clamping multiple wires. 7.2.9 The switch shall have the specified housing protection performance and shall comply with the provisions of GB/T4942.2-1993. JB/T5791—2002
Waterproof combination switches should comply with the IP56 protection level. After the test, they should be able to withstand AC 50Hz, with a minimum value of 2U; (but not less than a)
1000V AC voltage effective value) power frequency withstand voltage test, lasting imin, without breakdown and flashover. The protection combination switch should comply with the P20 protection level. b)
7.3 Performance requirements
7.3.1 The power frequency withstand voltage test value of the switch is 2500V. 2 The impact withstand voltage test value of the switch shall comply with the provisions of Table 7. 7.3.2
Table 7 Impact withstand voltage test value
Unit: V
Rated working voltage
300Product model and name;
b) Manufacturer's name or registered trademark:
c) Rated voltage and rated current:
d) Conversion position:
e) Ship inspection mark.
Auxiliary specification code: Indicates the number of poles
"P" indicates two power conversions "s" indicates three power conversions Basic specification code: Indicated by rated working current Derived series code
Design code, the first digit "9" indicates marine group code: Combination switch
Note: a), b), c), d) 4 items must be marked on the nameplate of the switch, e) can be marked on other parts of the product or product technical documents. 5.2 Switch conversion position as a mark indicating the closed or open position of the switch contact. 2
Normal working conditions
JB/T5791—2002
The switch can work normally under the environmental conditions specified in Table 1. If the conditions exceed those in Table 1, the supplier and buyer shall make a special order agreement to solve the problem.
Environmental conditions
Maximum ambient air temperature
Minimum ambient air temperature
Influence of humid air at sea
Influence of salt
Influence of mold
Influence of oil shoots
Installation category
Installation conditions
Normal working conditions
Rated data
40℃*
-25℃b
Pollution level
+40℃Mainly suitable for electrical appliances used in coastal and inland ships. Special consideration shall be given to places with a temperature higher than 45℃. Mainly suitable for electrical appliances installed on open decks and open deck cabins without insulation measures. Special consideration should be given to places below -25°C. "Refers to the impact generated during normal operation of seagoing vessels. Technical requirements
The switch shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved in the prescribed procedures. 7.1 Basic parameters
7.1.1 Rated frequency
50Hz (or 60Hz).
7.1.2 Rated working voltage
a) AC 380V;
b) DC 220V.
7.1.3 Rated working current
The rated working current of the switch is shown in Table 2.
Rated working voltage
Rated working current
Table 2 Rated working current
Note: When the single-pole switch has an AC voltage of 380V and a DC voltage of 220V, the working current drops to 6 0% of the rated working current. Rated working system
a) Long-term working system:
b) Repeated short-time working system.
7.2 Structural requirements
7.2.1 The switch has reliable indication marks to indicate the closing and opening of contacts. The disconnected position is indicated by the symbol "0\", and the closed position is indicated by the symbol \", 3
JB/T5791—2002
"I", "III", "IV". 7.2.2 The rotating part of the switch should be flexible and reliable, and the mechanism of the switch should enable the contacts to be placed in the closed or open position only. The operating torque acting on the switch handle should not be greater than that specified in Table 3. 7.2.3
Table 3 Operating torque
. Rated working current A||tt| |The electrical clearance and creepage distance of the switch shall not be less than the provisions in Table 4. 7.2.4
Rated working current A
Table 4 Electrical clearance and creepage distance
Electrical clearance
Note: The impact withstand voltage test shall be carried out according to the requirements of Table 7. 7.2.5
All solid connections of the switch shall not be automatically loosened or loosened. Operating torque N·m
Creep distance
7.2.6 All metal parts of the switch (except friction parts) shall have a reliable anti-corrosion layer. The switch shall have salt spray resistance, that is, the appearance changes of the metal plated parts of the switch exposed to the air after 48h salt spray test shall meet the qualified requirements specified in Table 5.
Table 5 Appearance of metal parts| |tt||Coating category
Copper+chrome
Parts material
Copper and copper alloy
Copper and copper alloy
Qualification requirements
No white or gray-black corrosion on the main surfaceNo light green corrosion on the main surface
No green on the main surface
All insulating parts of the switch should be smooth and beautiful, and there should be no cracks, obvious bubbles, deformation and other defects on the surface. 7.2.7
The insulating parts of the switch should generally be made of durable, flame-retardant, moisture-resistant and mildew-resistant materials: a)
The switch should have mildew-resistant performance, that is, the insulating parts of the switch exposed to the air, after the long test, the mildew area does not exceed the 2nd level specified in GB/T2423.16-1999. The insulating material used in the switch should be higher than or equal to Ib, and its comparative tracking index (CTI value) should be greater than 100. The heat resistance of the insulating material of the switch shall withstand the fire hazard test specified in 8.1.9.4 of this standard without causing combustion. d)
7.2.8 The switch shall have a terminal for external wires. The tightening torque of the terminal screws shall comply with the specified value in Table 6. It shall be able to compress and not damage the terminal and the wire.
Rated working current
Tightening torque of mechanical strength of threaded terminal Table 6
Screw diameter
Tightening torque N·m
Terminals are commonly used to clamp a single wire, but are also suitable for clamping multiple wires. 7.2.9 The switch shall have the specified housing protection performance and shall comply with the provisions of GB/T4942.2-1993. JB/T5791—2002
Waterproof combination switches should comply with the IP56 protection level. After the test, they should be able to withstand AC 50Hz, with a minimum value of 2U; (but not less than a)
1000V AC voltage effective value) power frequency withstand voltage test, lasting imin, without breakdown and flashover. The protection combination switch should comply with the P20 protection level. b)
7.3 Performance requirements
7.3.1 The power frequency withstand voltage test value of the switch is 2500V. 2 The impact withstand voltage test value of the switch shall comply with the provisions of Table 7. 7.3.2
Table 7 Impact withstand voltage test value
Unit: V
Rated working voltage
300Product model and name;
b) Manufacturer's name or registered trademark:
c) Rated voltage and rated current:
d) Conversion position:
e) Ship inspection mark.
Auxiliary specification code: Indicates the number of poles
"P" indicates two power conversions "s" indicates three power conversions Basic specification code: Indicated by rated working current Derived series code
Design code, the first digit "9" indicates marine group code: Combination switch
Note: a), b), c), d) 4 items must be marked on the nameplate of the switch, e) can be marked on other parts of the product or product technical documents. 5.2 Switch conversion position as a mark indicating the closed or open position of the switch contact. 2
Normal working conditions
JB/T5791—2002
The switch can work normally under the environmental conditions specified in Table 1. If the conditions exceed those in Table 1, the supplier and buyer shall make a special order agreement to solve the problem.
Environmental conditions
Maximum ambient air temperature
Minimum ambient air temperature
Influence of humid air at sea
Influence of salt
Influence of mold
Influence of oil shoots
Installation category
Installation conditions
Normal working conditions
Rated data
40℃*
-25℃b
Pollution level
+40℃Mainly suitable for electrical appliances used in coastal and inland ships. Special consideration shall be given to places with a temperature higher than 45℃. Mainly suitable for electrical appliances installed on open decks and open deck cabins without insulation measures. Special consideration should be given to places below -25°C. "Refers to the impact generated during normal operation of seagoing vessels. Technical requirements
The switch shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved in the prescribed procedures. 7.1 Basic parameters
7.1.1 Rated frequency
50Hz (or 60Hz).
7.1.2 Rated working voltage
a) AC 380V;
b) DC 220V.
7.1.3 Rated working current
The rated working current of the switch is shown in Table 2.
Rated working voltage
Rated working current
Table 2 Rated working current
Note: When the single-pole switch has an AC voltage of 380V and a DC voltage of 220V, the working current drops to 6 0% of the rated working current. Rated working system
a) Long-term working system:
b) Repeated short-time working system.
7.2 Structural requirements
7.2.1 The switch has reliable indication marks to indicate the closing and opening of contacts. The disconnected position is indicated by the symbol "0\", and the closed position is indicated by the symbol \", 3
JB/T5791—2002
"I", "III", "IV". 7.2.2 The rotating part of the switch should be flexible and reliable, and the mechanism of the switch should enable the contacts to be placed in the closed or open position only. The operating torque acting on the switch handle should not be greater than that specified in Table 3. 7.2.3
Table 3 Operating torque
. Rated working current A||tt| |The electrical clearance and creepage distance of the switch shall not be less than the provisions in Table 4. 7.2.4
Rated working current A
Table 4 Electrical clearance and creepage distance
Electrical clearance
Note: The impact withstand voltage test shall be carried out according to the requirements of Table 7. 7.2.5
All solid connections of the switch shall not be automatically loosened or loosened. Operating torque N·m
Creep distance
7.2.6 All metal parts of the switch (except friction parts) shall have a reliable anti-corrosion layer. The switch shall have salt spray resistance, that is, the appearance changes of the metal plated parts of the switch exposed to the air after 48h salt spray test shall meet the qualified requirements specified in Table 5.
Table 5 Appearance of metal parts| |tt||Coating category
Copper+chrome
Parts material
Copper and copper alloy
Copper and copper alloy
Qualification requirements
No white or gray-black corrosion on the main surfaceNo light green corrosion on the main surface
No green on the main surface
All insulating parts of the switch should be smooth and beautiful, and there should be no cracks, obvious bubbles, deformation and other defects on the surface. 7.2.7
The insulating parts of the switch should generally be made of durable, flame-retardant, moisture-resistant and mildew-resistant materials: a)
The switch should have mildew-resistant performance, that is, the insulating parts of the switch exposed to the air, after the long test, the mildew area does not exceed the 2nd level specified in GB/T2423.16-1999. The insulating material used in the switch should be higher than or equal to Ib, and its comparative tracking index (CTI value) should be greater than 100. The heat resistance of the insulating material of the switch shall withstand the fire hazard test specified in 8.1.9.4 of this standard without causing combustion. d)
7.2.8 The switch shall have a terminal for external wires. The tightening torque of the terminal screws shall comply with the specified value in Table 6. It shall be able to compress and not damage the terminal and the wire.
Rated working current
Tightening torque of mechanical strength of threaded terminal Table 6
Screw diameter
Tightening torque N·m
Terminals are commonly used to clamp a single wire, but are also suitable for clamping multiple wires. 7.2.9 The switch shall have the specified housing protection performance and shall comply with the provisions of GB/T4942.2-1993. JB/T5791—2002
Waterproof combination switches should comply with the IP56 protection level. After the test, they should be able to withstand AC 50Hz, with a minimum value of 2U; (but not less than a)
1000V AC voltage effective value) power frequency withstand voltage test, lasting imin, without breakdown and flashover. The protection combination switch should comply with the P20 protection level. b)
7.3 Performance requirements
7.3.1 The power frequency withstand voltage test value of the switch is 2500V. 2 The impact withstand voltage test value of the switch shall comply with the provisions of Table 7. 7.3.2
Table 7 Impact withstand voltage test value
Unit: V
Rated working voltage
3001 The switch shall have reliable indication marks for contact closure and disconnection. The disconnect position shall be indicated by the symbol "0\", and the closed position shall be indicated by the symbol \", 3
JB/T5791—2002
"I", "III", and "IV". 7.2.2 The rotating part of the switch shall be flexible and reliable, and the mechanism of the switch shall enable the contacts to be placed in the closed or disconnected position only. The operating torque acting on the switch handle shall not be greater than the provisions of Table 3. 7.2.3
Table 3 Operating torque
. Rated working current A
The electrical clearance and creepage distance of the switch shall not be less than the provisions of Table 4. 7.2.4
Rated working current A
Table 4 Electrical clearance and creepage distance
Electrical clearance
Note: The impulse withstand voltage test shall be carried out according to the requirements of Table 7. 7.2.5
All the solid connections of the switch shall not be automatically loosened or loosened. Operating torque N·m
Creep distance
7.2.6 All metal parts of the switch (except friction parts) shall have a reliable anti-corrosion layer. The switch shall have salt spray resistance, that is, the appearance changes of the metal plated parts of the switch exposed to the air after 48h salt spray test shall meet the qualified requirements specified in Table 5.
Table 5 Appearance of metal parts
Coating category
Oil + chromium
Parts material
Copper and copper alloy
Copper and copper alloy
Qualified requirements
No white or gray-black corrosion on the main surfaceNo light green corrosion on the main surface
No green on the main surface
All insulating parts of the switch shall be smooth and beautiful, and there shall be no cracks, obvious bubbles, deformation and other defects on the surface. 7.2.7
The insulating parts of the switch shall generally be made of durable, flame-retardant, moisture-resistant and mildew-resistant materials: a)
The switch shall have mildew-resistant properties, that is, the mildew-growing area of the insulating parts of the switch exposed to the air shall not exceed the 2nd grade long-term special specified in GB/T2423.16-1999 after long-term testing. The insulating material used in the switch shall be of a group higher than or equal to Ib, and its comparative tracking index (CTI value) shall be greater than 100. The heat resistance of the insulating material of the switch shall withstand the fire hazard test specified in 8.1.9.4 of this standard without causing combustion. d)
7.2.8 The switch shall have a terminal for external wires. The tightening torque of the terminal screws shall comply with the specified value in Table 6, and shall be able to be compressed and shall not damage the terminal and wire.
Rated working current
Tightening torque of mechanical strength of screw-type terminal block Table 6
Screw diameter
Tightening torque N·m
Terminal blocks are commonly used to clamp single wires, but are also suitable for clamping multiple wires. 7.2.9 The switch shall have the specified housing protection performance and shall comply with the provisions of GB/T4942.2-1993. JB/T5791-2002
Waterproof combination switches shall comply with IP56 protection level and shall be able to withstand AC 50Hz, minimum value of 2U after the test; (but not less than a)
1000V AC voltage effective value) power frequency withstand voltage test, lasting imin, without breakdown flashover phenomenon. Protective combination switches shall comply with P20 protection level. b)
7.3 Performance requirements
7.3.1 The power frequency withstand voltage test value of the switch is 2500V. 2 The impulse withstand voltage test value of the switch shall comply with the provisions of Table 7. 7.3.2
Table 7 Impulse withstand voltage test value
Unit: V
Rated working voltage
3001 The switch shall have reliable indication marks for contact closure and disconnection. The disconnect position shall be indicated by the symbol "0\", and the closed position shall be indicated by the symbol \", 3
JB/T5791—2002
"I", "III", and "IV". 7.2.2 The rotating part of the switch shall be flexible and reliable, and the mechanism of the switch shall enable the contacts to be placed in the closed or disconnected position only. The operating torque acting on the switch handle shall not be greater than the provisions of Table 3. 7.2.3
Table 3 Operating torque
. Rated working current A
The electrical clearance and creepage distance of the switch shall not be less than the provisions of Table 4. 7.2.4
Rated working current A
Table 4 Electrical clearance and creepage distance
Electrical clearance
Note: The impulse withstand voltage test shall be carried out according to the requirements of Table 7. 7.2.5
All the solid connections of the switch shall not be automatically loosened or loosened. Operating torque N·m
Creep distance
7.2.6 All metal parts of the switch (except friction parts) shall have a reliable anti-corrosion layer. The switch shall have salt spray resistance, that is, the appearance changes of the metal plated parts of the switch exposed to the air after 48h salt spray test shall meet the qualified requirements specified in Table 5.
Table 5 Appearance of metal parts
Coating category
Oil + chromium
Parts material
Copper and copper alloy
Copper and copper alloy
Qualified requirements
No white or gray-black corrosion on the main surfaceNo light green corrosion on the main surface
No green on the main surface
All insulating parts of the switch shall be smooth and beautiful, and there shall be no cracks, obvious bubbles, deformation and other defects on the surface. 7.2.7
The insulating parts of the switch should generally be made of durable, flame-retardant, moisture-resistant and mildew-resistant materials: a)
The switch should have mildew-resistant properties, that is, the mildew-growing area of the insulating parts of the switch exposed to the air shall not exceed the 2nd level specified in GB/T2423.16-1999 after long-term testing. The insulating material used in the switch should be higher than or equal to Ib, and its comparative tracking index (CTI value) should be greater than 100. The heat resistance of the insulating material of the switch should withstand the fire hazard test specified in 8.1.9.4 of this standard without causing combustion. d)
7.2.8 The switch should have a terminal for external wires. The tightening torque of the terminal screws should comply with the specified value in Table 6, and should be able to be compressed and should not damage the terminal and wire.
Rated working current
Tightening torque of mechanical strength of screw-type terminal block Table 6
Screw diameter
Tightening torque N·m
Terminal blocks are often used to clamp single wires, but are also suitable for clamping multiple wires. 7.2.9 The switch shall have the specified housing protection performance and shall comply with the provisions of GB/T4942.2-1993. JB/T5791-2002
Waterproof combination switches shall comply with IP56 protection level and shall be able to withstand AC 50Hz, minimum value of 2U after the test; (but not less than a)
1000V AC voltage effective value) power frequency withstand voltage test, lasting imin, without breakdown flashover phenomenon. Protective combination switches shall comply with P20 protection level. b)
7.3 Performance requirements
7.3.1 The power frequency withstand voltage test value of the switch is 2500V. 2 The impulse withstand voltage test value of the switch shall comply with the provisions of Table 7. 7.3.2
Table 7 Impulse withstand voltage test value
Unit: V
Rated working voltage
300
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