GB 1444-1987 Special screw-type lamp holder for explosion-proof lamps
Some standard content:
National Standard of the People's Republic of China
Screw-type lampholders specially used for explosion-proof lamps
Edison screw lampholders specially used for explosion-proof luminaires This standard applies to screw-type lampholders specially used for explosion-proof lamps in explosive environments (the following Referred to as the lamp holder). In addition to complying with this standard, lamp holders must also comply with relevant national standards. 1 Type, basic parameters and dimensions
1.1 Type
1.1.1 The lamp holder must be fixed in a flat mounting style. 1.1.2 The insulating material of the lamp holder can be selected from:
a. Ceramics
b. Plastic (suitable for E10, E14);
c. The performance is equivalent to other materials such as ceramics and plastics. 1.1.3 There must be an insulating sheath outside the screw of the lamp holder. 1.2 Basic parameters
The basic parameters of the lamp holder must comply with the requirements in Table 1. Lamp holder code
E10
E14
E27
E40
Connected lamp holder model
E10/12
E10 /13
E10/13×11
E10/14×11
E14/20
E14/23×15
E14/25×17
E27/25
E27/27
E27/35×30
E27/65×45
E40/45
E40 /55×47
E40/75×54
E40/75×64
Approved by the National Bureau of Standards on 1987-06-18
Table 1
Maximum working voltage
50
250
250
250
Maximum working current
A
2.5||tt ||2.5
10
UDC621.316.58
622.473
GB1444—87
replaces GB1444—78
maximum rating of the connected bulb Power
W
25
60
300
1000
1988-03-01 Implementation
1.3 lamp holder Screw position
GB
31444-87
After screwing the corresponding lamp holder into the lamp holder, the relative position of the screw of the lamp holder and the center contact must comply with Figure 1 and The provisions of Table 2. Figure 1
Figure 1 shows the position of the center contact after the lamp head is fully rotated. Table 2
Lamp holder code
E10
E14
E27
E40
1.4 installation size
minimum value| |tt||7.5
12
17
The installation dimensions of the lamp holder must comply with the requirements in Table 3. Lamp holder code
E10
E:14
E27
E40
Explosionproof chamber structural parameters
1.5
Mounting hole center distance D
mm
26
30
50
70
十
Table 3|| tt||Maximum value
9.3
15
21
32
Installation hole diameter
mm
4| |tt||5
6
The structural parameters of the explosion-proof chamber of the central contact in the lamp holder must comply with the requirements in Table 4. Table 4
Joint surface type
Cylinder type
Explosionproof chamber
Net volume V
<0.02
Explosionproof joint| |tt||Surface length L
mm
>6
Flameproof joint surface
Maximum diameter difference W
mm
0.20
Y
Minimum value
3.5
5
7
12
Number of mounting holes
2
2
2
2
mm
Roughness
1.6 Lamp holder structure
Lamp holder structure diagram as shown in picture 2.
GB1444-87
Remove the insulating sheath
Picture 2
1 - Insulating sheath; 2 - Center contact 3 - Flameproof chamber, 4 - Glue Seal; 5-mounting hole, D mounting hole center distance
flameproof joint surface
2 technical requirements
GB1444-87
2.1 Lamp holder thread must comply with GB1005- 67 "Round threads for lamp caps and lamp holders". 2.2 There should be a space suitable for the bending radius of the wire at the connecting post in the lamp holder. The terminal connecting the central contact of the flameproof chamber must be connected to the external phase wire. The terminal connected to the screw port should be marked with a "0" symbol. 2.3 The number of effective connection threads between metals in the lamp holder must be no less than 2, and the wiring components must be fixed with anti-loosening measures. 2.4 The electrical gap between conductive parts of different polarities in the lamp holder must be no less than 3mm, and the creepage distance must be no less than 4mm. 2.5
The dielectric strength of the lamp holder must comply with the provisions of Section 7.2.2 of GB1497-85 "Basic Standard for Low Voltage Electrical Appliances". 2.6
The lamp holder must be able to withstand the damp heat test specified in 3.2, and 2.7
The insulating shell of the lamp holder must be able to withstand the impact test specified in 3.3. 2.8
The lamp holder must be able to withstand the operational test specified in 3.4. The lamp holder must be able to withstand the temperature rise test specified in Article 3.5. 2.9
2.10 The lamp holder must be able to withstand the high temperature test specified in 3.6. 2.11
The sealing material inside the lamp holder must comply with the performance specified in Chapter 12 of GB3836.1-83 "General Requirements for Explosion-Proof Electrical Equipment for Explosive Environments".
2.12 The ferrous metal parts of the lamp holder must have an anti-corrosion protective layer, which can be treated with zinc plating (passivation) or nickel plating. 2.12.1 The protective layer shall not have spots, peeling or peeling. 2.12.2 Parts must be able to withstand the salt spray test specified in 3.7. 2.13 Conductive parts and screws made of copper and copper alloy in the lamp holder must be nickel-plated or silver-plated. The screw before plating must be able to withstand the cracking resistance test specified in 3.8.
2.14 Ceramic materials must comply with the relevant regulations of GB773-78 "Technical Conditions for Low-Voltage Electric Porcelain Parts". 2.15 Plastic parts must be able to withstand the following tests: 8 Flame resistance test specified in 3.9;
b. According to the thermal stability test specified in GB3836.1 24.2. The relative leak mark resistance index of plastic parts must be no less than level C. 2.16. The surface of plastic parts should be free of bubbles, cracks, lack of powder, swelling and other defects. 3 Test methods
3.1 Appearance and dimensional inspection
3.1.1 The lamp holder must comply with the provisions of 1.3, 1.4, 1.5, 2.1, 2.2, 2.3, 2.4, 2.12.1, 2.14, and 2.16. Visual and dimensional inspection of samples is performed with the naked eye and metrological tools. 3.1.21.3 The relative position dimensions of the screw mouth of the lamp holder and the center contact are measured using the gauge shown in Figure 3. Gauges must comply with Table 5. When the gauge is screwed into the base of the lamp base, it should be possible to push the capital to a position where the mark is flush with the top of the gauge or beyond. Lamp holder code
E14
E27
E40
a
6.2*8-1
11.5 *g.||tt| |18 *.1
GB1444—87
Figure 3
Table 5
b
15 *9-015
28 * 9.015
42 *9-02
Note: When the mark coincides with the above edge of the gauge, c is the value of c,. 3.2 Moisture and heat test
Column
c
12 +-1
17 +g-1
27 *g-1
d || tt | 3.3 Impact test
mm
3.3.1. The insulating shell of the lamp holder must be subjected to impact testing. 3.3.2 The impact test is carried out with the equipment shown in Figure 4. The impact height (referring to the projected distance between the hammer head and the impact point on the plumb line) must comply with the requirements in Table 6. The hammer head of the pendulum is made of nylon with a Rockwell hardness of R100, weighs 0.15kg, and the impact surface is a hemisphere with a radius of 10mm. The swing handle is made of steel pipe with an outer diameter of 9mm and a wall thickness of 0.5mm. The hammer head is fixed on the swing handle. The effective length of the swing handle is 1m. 6
GB1444-87
Picture 4
1 is the positioning pin, 2 is the swing handle, 3 is the impact hammer, h is the impact height, 4 is the sample, 5 is the bottom plate (with Made of plywood with a thickness of 8mm and an area of ??175×175mm2), 6-bracket Table 6
Insulation shell material
Porcelain
Quality
Other materials|| tt||Impact height h
10
15
cm
3.3.3 During the test, fix the test equipment on the wall, and then clamp the lamp holder on on the base plate, with its outer edge touching the base plate. The impact point should be at the position where the top of the hammer head is when the pendulum is in the vertical position. When the hammer head impacts the impact point, the impact surface must be perpendicular to the axis of the hammer head.
3.3.4 The insulating shell of the lamp holder is impacted once at each of the 5 weak points. If no cracks are visible to the naked eye, it is considered qualified. 3.4 Operation test
3.4.1 Under the load (pure resistance) conditions listed in Table 7, the lamp holder must withstand the operation test of connecting and disconnecting the lamp holder corresponding to the lamp holder 500 times each.
3.4.2 The operation test is carried out according to the circuit shown in Figure 5 and on the special equipment shown in Figure 6. The test lamp holder must comply with the requirements of GB1406-78 "Types and Dimensions of Screw-type Lamp Holders". Lamp holder code
E10
E14
E27
E40
5
GB1444-87
Table 7|| tt||Test voltage, V
50
250
250
Figure 5
Figure 6
Without load||tt ||1—guide rail; 2—test lamp holder, 3 one sample: 4 mechanical transmission (worm gear) mechanism: 5 one conductive ring; 6 one code test current, A
2.5
2.5|| tt | | 4 | | tt | Circuits are made and broken. The rotating torque should comply with the requirements in Table 8. Table 8
Lamp holder code
E10
E14
E27
E40
3.4.4
a.| |tt||b.
c.
After the test, the lamp holder must be inspected one by one according to the following items: Rotating torque
Torque, N·m||tt ||0.8±0.1
1.0±0.1
1.5±0.1
3.0±0.1
Use the torque in Table 8 to screw the lamp holder into the lamp holder and reverse the rotation 15 degrees, and then measure the minimum torque for unscrewing, which must not be less than the requirements in Table 9. Table 9 Minimum torque for unscrewing
Lamp holder code
E10
E14
E27
E40
Rotate the lamp holder into the lamp holder After conduction,
should be able to continue to rotate the lamp holder for more than or equal to 1/4 turn. Torque, N·m
0.2
0.3
0.5
1.0
The center contact of the lamp holder is compressed to the ultimate use position (that is, with the porcelain mouth (flat), its total elasticity must comply with the requirements in Table 10. Table 10
Lamp
Block code
E10
E14
E27
E40
Total elastic force, N|| tt||10 ~20
15~25
20~35
30~50
The lamp holder must be able to withstand the dielectric specified in GB1497-857.2.2 Strength test. d.
The lamp holder should not have loose parts, elastic failure, twisting and cracking of the screw, and shattering of insulating parts that would affect normal use. e.
3.5 Temperature rise test
GB1444-87
3.5.1 The lamp holder must be subjected to a temperature rise test indoors without external airflow, strong sunlight and other thermal radiation. 3.5.2 Use wires with the largest cross-section specified in Table 11 and lamp holders that comply with GB1406-78 for wiring according to the circuit shown in Figure 7. Table 11 Lamp holder wiring conductor cross-sectional area
Lamp holder code
E10
E14
E27
E40
Figure 7||tt ||Total cross-sectional area of ??each conductor, mm2
0.2~1
0.2~1
0.5~2.5
1~4
TY一自Coupling voltage regulator, R - variable resistor, S, - lamp holder under test S, - test lamp holder, A - ammeter
3.5.3 The temperature must be measured with a thermocouple. When measuring the contact temperature, the thermocouple should be welded close to the contact point in advance, but the thermocouple should not affect the normal contact between the lamp holder and the lamp cap. 3.5.4 The lamp holder is supplied with the maximum operating current listed in Table 1. When the temperature rise rate does not exceed 1°C every 30 minutes, the temperature rise is considered to have stabilized. 3.5.5 Test results: the temperature rise of the center contact of the lamp holder must not exceed +80°C, and the temperature rise of the terminal terminal must not exceed +45°C. 3.6 High Temperature Test
3.6.1 Screw the lamp holder corresponding to the lamp holder that complies with GB1406-78 into the lamp holder, and then put it together into the oven, so that the temperature in the box reaches the working limit of the lamp holder within 30 to 60 minutes Temperature value of +20℃. 3.6.2 During the heat preservation process, the temperature deviation shall not be greater than ±5°C. 3.6.3 After seven days and nights of heat preservation, stop heating, open the oven, and allow the lamp holder to naturally cool to room temperature before taking it out and inspecting it with the naked eye. There should be no failure of elastic parts, cracking of insulating parts, obvious blistering, swelling, degumming, or deformation of the lamp holder. , filling material leakage and other defects that hinder normal use.
3. During the test, the lamp holder to be tested is fixed on the fixture, and the lamp head is screwed in and out 15 times per minute to connect and disconnect the circuit of the lamp holder. The rotating torque should comply with the requirements in Table 8. Table 8
Lamp holder code
E10
E14
E27
E40
3.4.4
a.| |tt||b.
c.
After the test, the lamp holder must be inspected one by one according to the following items: Rotating torque
Torque, N·m||tt ||0.8±0.1
1.0±0.1
1.5±0.1
3.0±0.1
Use the torque in Table 8 to screw the lamp holder into the lamp holder and reverse the rotation 15 degrees, and then measure the minimum torque for unscrewing, which must not be less than the requirements in Table 9. Table 9 Minimum torque for unscrewing
Lamp holder code
E10
E14
E27
E40
Rotate the lamp holder into the lamp holder After conduction,
should be able to continue to rotate the lamp holder for more than or equal to 1/4 turn. Torque, N·m
0.2
0.3
0.5
1.0
The center contact of the lamp holder is compressed to the extreme position (that is, with the porcelain mouth) (flat), its total elasticity must comply with the requirements in Table 10. Table 10
Lamp
Block code
E10
E14
E27
E40
Total elastic force, N|| tt||10 ~20
15~25
20~35
30~50
The lamp holder must be able to withstand the dielectric specified in GB1497-857.2.2 Strength test. d.
The lamp holder should not have loose parts, elastic failure, twisting and cracking of the screw, and shattering of insulating parts that would affect normal use. e.
3.5 Temperature rise test
GB1444-87
3.5.1 The lamp holder must be subjected to a temperature rise test indoors without external airflow, strong sunlight and other thermal radiation. 3.5.2 Use wires with the largest cross-section specified in Table 11 and lamp holders that comply with GB1406-78 for wiring according to the circuit shown in Figure 7. Table 11 Lamp holder wiring conductor cross-sectional area
Lamp holder code
E10
E14
E27
E40
Figure 7||tt ||Total cross-sectional area of ??each conductor, mm2
0.2~1
0.2~1
0.5~2.5
1~4
TY一自Coupling voltage regulator, R - variable resistor, S, - lamp holder under test S, - test lamp holder, A - ammeter
3.5.3 The temperature must be measured with a thermocouple. When measuring the contact temperature, the thermocouple should be welded close to the contact point in advance, but the thermocouple should not affect the normal contact between the lamp holder and the lamp cap. 3.5.4 The lamp holder is supplied with the maximum operating current listed in Table 1. When the temperature rise rate does not exceed 1°C every 30 minutes, the temperature rise is considered to have stabilized. 3.5.5 Test results: the temperature rise of the center contact of the lamp holder must not exceed +80°C, and the temperature rise of the terminal terminal must not exceed +45°C. 3.6 High Temperature Test
3.6.1 Screw the lamp holder corresponding to the lamp holder that complies with GB1406-78 into the lamp holder, and then put it together into the oven, so that the temperature in the box reaches the working limit of the lamp holder within 30 to 60 minutes Temperature value of +20℃. 3.6.2 During the heat preservation process, the temperature deviation shall not be greater than ±5°C. 3.6.3 After seven days and nights of heat preservation, stop heating, open the oven, and allow the lamp holder to naturally cool to room temperature before taking it out and inspecting it with the naked eye. There should be no failure of elastic parts, cracking of insulating parts, obvious blistering, swelling, degumming, or deformation of the lamp holder. , filling material leakage and other defects that hinder normal use.
3. During the test, the lamp holder to be tested is fixed on the fixture, and the lamp head is screwed in and out 15 times per minute to connect and disconnect the circuit of the lamp holder. The rotating torque should comply with the requirements in Table 8. Table 8
Lamp holder code
E10
E14
E27
E40
3.4.4
a.| |tt||b.
c.
After the test, the lamp holder must be inspected one by one according to the following items: Rotating torque
Torque, N·m||tt ||0.8±0.1
1.0±0.1
1.5±0.1
3.0±0.1
Use the torque in Table 8 to screw the lamp holder into the lamp holder and reverse the rotation 15 degrees, and then measure the minimum torque for unscrewing, which must not be less than the requirements in Table 9. Table 9 Minimum torque for unscrewing
Lamp holder code
E10
E14
E27
E40
Rotate the lamp holder into the lamp holder After conduction,
should be able to continue to rotate the lamp holder for more than or equal to 1/4 turn. Torque, N·m
0.2
0.3
0.5
1.0
The center contact of the lamp holder is compressed to the ultimate use position (that is, with the porcelain mouth (flat), its total elasticity must comply with the requirements in Table 10. Table 10
Lamp
Block code
E10bzxZ.net
E14
E27
E40
Total elastic force, N|| tt||10 ~20
15~25
20~35
30~50
The lamp holder must be able to withstand the dielectric specified in GB1497-857.2.2 Strength test. d.
The lamp holder should not have loose parts, elastic failure, twisting and cracking of the screw, and shattering of insulating parts that would affect normal use. e.
3.5 Temperature rise test
GB1444-87
3.5.1 The lamp holder must undergo a temperature rise test indoors without external airflow, strong sunlight and other thermal radiation. 3.5.2 Use wires with the largest cross-section specified in Table 11 and lamp holders that comply with GB1406-78 for wiring according to the circuit shown in Figure 7. Table 11 Lamp holder wiring conductor cross-sectional area
Lamp holder code
E10
E14
E27
E40
Figure 7||tt ||Total cross-sectional area of ??each conductor, mm2
0.2~1
0.2~1
0.5~2.5
1~4
TY一自Coupling voltage regulator, R - variable resistor, S, - lamp holder under test S, - test lamp holder, A - ammeter
3.5.3 The temperature must be measured with a thermocouple. When measuring the contact temperature, the thermocouple should be welded close to the contact point in advance, but the thermocouple should not affect the normal contact between the lamp holder and the lamp cap. 3.5.4 The lamp holder is supplied with the maximum operating current listed in Table 1. When the temperature rise rate does not exceed 1°C every 30 minutes, the temperature rise is considered to have stabilized. 3.5.5 Test results: the temperature rise of the center contact of the lamp holder must not exceed +80°C, and the temperature rise of the terminal block must not exceed +45°C. 3.6 High Temperature Test
3.6.1 Screw the lamp holder corresponding to the lamp holder that complies with GB1406-78 into the lamp holder, and then put it together into the oven, so that the temperature in the box reaches the working limit of the lamp holder within 30 to 60 minutes Temperature value of +20℃. 3.6.2 During the heat preservation process, the temperature deviation shall not be greater than ±5°C. 3.6.3 After seven days and nights of heat preservation, stop heating, open the oven, and let the lamp holder naturally cool to room temperature before taking it out and inspecting it with the naked eye. The lamp holder shall not show failure of elastic parts, cracking of insulating parts, obvious blistering, swelling, degumming, or deformation. , filling material leakage and other defects that hinder normal use.
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