Some standard content:
GB17935—1999
This standard is equivalent to IEC60238:1996 screw-type lamp holder (6th edition) and the 1997 amendment No. 1 and No. 2. Its technical content and writing format are completely consistent with IEC 60238. This standard specifies the safety requirements and inspection methods of the corresponding lamp holders, which are equivalent to the International Electrotechnical Commission IEC60238:1996 (6th edition), which will enable the electric light source and its accessories industry to adapt to the needs of international cost, technical and economic exchanges and international quality certification as soon as possible. This standard is a mandatory national standard.
Appendix A of this standard is the appendix of the standard. From the date of implementation of this standard, the original QB2427—1999 screw-type lamp holder technical conditions will cease. This standard is proposed by the State Bureau of Light Industry.
This standard is under the jurisdiction of the Electric Light Source and Its Accessories Sub-Technical Committee of the National Technical Committee for Standardization of Lighting Appliances. This standard was drafted by: Beijing Electric Light Source Research Institute. This standard was drafted by: Jie Tianxia, Wang Zhilu, Hua Shuming. GB 179351999
IEC Foreword
1) The International Electrotechnical Commission 1EC is a worldwide standardization organization composed of the Electrotechnical Technical Committees (IEC National Committees) of each member country. The goal of 1EC is to promote cooperation on various issues related to standardization in the field of electrical and electronic products. To this end, IEC has published various international standards. The drafting of these standards is the responsibility of various technical committees. If IEC member countries are interested in the content involved in the standards, they can also participate in the drafting work. International organizations, governments and non-governmental organizations that have established relations with IEC can participate in the drafting work. IEC and the International Organization for Standardization (ISO) work closely together under the conditions agreed by both parties. 2) In view of the fact that each technical committee has representatives from the committees of each member country, the formal decisions or agreements of IEC on technical issues have expressed the international consensus on the corresponding issues as much as possible. 3) Recommended standards, reports or guidelines published for international use are, in a sense, adopted by the committees of each country. 4) In order to promote international uniformity, IEC member committees should adopt IEC international standards to the greatest extent possible. Any differences between IEC standards and national or regional standards should be clearly stated in the latter. 5) IEC does not provide any conformity recognition mark and does not assume any responsibility for any equipment claiming to conform to IEC standards. 6) Some of the contents of this international standard may involve patent rights. IEC is not responsible for the identification and confirmation of all such patent rights. This international standard was prepared by IEC Technical Committee 34B responsible for lamp caps and lamp holders. The text of this standard is based on the fifth edition and its amendments 1 and 2 and the following documents: Draft Standard No.
34B/591/FDIS
Voting Report No.
34B/620/RVD
The voting results for the adoption of this standard are given in the voting report listed in the table above. Appendix A is an integral part of this standard.
1 General
1.1 Scope
National Standard of the People's Republic of China
Edison screw lamp holders
GB 17935-1999
idtIEC60238:1996
This standard applies to E14, E27 and E40 Edison screw lamp holders used only when lamps and semi-luminaires* are connected to the power supply. This standard also applies to switch-type lamp holders used only in AC circuits with a working voltage not exceeding 250V (effective value). This standard also applies to E5 screw lamp holders for indoor use with a working voltage not exceeding 25V, E10 screw lamp holders for indoor and outdoor use with a working voltage not exceeding 60V, and E10 lamp holders for recessed use connected to the power supply alone. These lamp holders shall not be sold seasonally.
This standard also applies to non-screw-type lampholders connected in series with the power supply, as far as it is justified. NOTE 1 This type of lampholder is used, for example, in Christmas tree lighting circuits. This standard also applies to lampholders that are fully or partially integrated with luminaires and those that are intended to be installed in equipment. This standard only deals with the requirements for lampholders. For other requirements, such as protection against electric shock at the terminals, the standards for the relevant equipment should be used, and when the equipment is tested in accordance with this standard, such lampholders should be installed in appropriate equipment and then tested. Such lampholders shall not be sold retail. Free-standing lampholders that are not specifically intended for recessed installation, such as flush-mount lampholders, may also be tested as luminaires. This standard applies to lampholders installed in indoor, outdoor, residential lighting fixtures and industrial lighting equipment, and also to candle-type lampholders. In certain occasions where the conditions of use are special, such as in street lighting, on ship decks, in motor vehicles and in those hazardous places where explosions are likely to occur, specially constructed lampholders may be used.
2 This standard is based on the following parameters of corresponding general lighting lamps: - E14 lamp cap for lamps with a current not exceeding 2 A; - F27 lamp cap for lamps with a current not exceeding 4 A; - E40 lamp cap for lamps with a current not exceeding 16 A. 3 If the nominal voltage of the power supply does not exceed 130 V, the maximum current of the E40 lamp cap is 32 A (see 4.5 and 5.3). 4 For lamp holders used in lamps, the maximum operating temperature is given in GB 7000.1. 1.2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB1406-1989 Types and dimensions of screw-type lamp holders (neqIEC60061-1) GB/T 2423.8-1995 Environmental testing for electric and electronic products Part 2: Test methods: Test Ed: Free fall (idt IEC 60068-2-32:1990)
GB/T 2423.28-1982
Basic environmental testing procedures for electronic and electrical products Test T: Welding test method (eqvIEC 60068-2-20:1979)
GB/T 2423.44-1995 Environmental testing for electric and electronic products Part 2: Test methods: Test Eg Impact, spring hammer * Technical requirements for lamp holders for semi-luminaires are still under development, State Administration of Quality and Technical Supervision 1999- 12 - 30 Approved for implementation on August 1, 2000
GB17935—1999
(eqvIEC6006B-2-63.1991)
GB/T 2423. 46-1997
Environmental testing for electric and electronic products Part 2. Test method test: impact pendulum (idt IEC 60068-2-62:1993)
GB/T 4207—1984 Test method for comparison of the electrical insulation index and the leakage insulation index of solid insulating materials under humid conditions (neq IEC 60112.1979)
GB4208—1993 Enclosure protection grade (IP code>(eqYIEC605291989)GB/T 4677.10—1984 Test method for solderability of printed version (negIEC60068-2-20c) GB4706.1-1998 Safety of household and similar electrical appliances - Part - General requirements (eqVIEC60335-1:1991) GB5013—1997 Rubber insulated cables with rated voltages up to and including 450/750V (idtIEC60245) GB5023—1997 Polyvinyl fluoride insulated cables with rated voltages up to and including 450/750V (idtIEC60227) GB/T5169.5-1997 Fire hazard testing for electrical and electronic products - Part 2: Test methods - Part 2 - Needle flame test (idt IEC 60695-2-2:1991)
GB/T 5169.10—1997 Test methods for fire hazard tests on electric and electronic products-Glow-wire test methods-General rules IEC 60695-2-1/0.19942 GB/T 5169. 11—1997 Test methods for fire hazard tests on electric and electronic products (IEC 60695-2-1/1:1994) GB/T 5465.2—1996 Graphical symbols for electrical equipment (IEC 60417:1994) GB7000.1-1996 General safety requirements and tests for luminaires (IEC 60598-1:1992) Glow-wire test and guide for finished products
GB15092.1—1994 Appliance switches Part 1, General requirements (idtIEC 61058-111990)QB3590—1999 Types and dimensions of screw-type lampholdersQB/T 3591—1999 Inspection gauge for screw-type lampholdersIEC60399:1972Circular thread for lampshade fastening ring of E14 and E27 lampholders2 Definitions
This standard adopts the following definitions. For illustrations of some definitions, see Figure 18.2.1 Cord-grip lampholder A lampholder equipped with a device for fixing a flexible wire, through which the lampholder can be suspended. 2.2 Thread entry lampholder A lampholder with a threaded part at the entrance of the power cord so that it can be installed on a bracket with matching threads (formerly called threaded tube lampholder).
2.3 Back plate lampholder A lampholder that is directly mounted on a supporting surface or a suitable housing through its combined base or integral base. 2.4 Lamphalder for building-in A lampholder installed in a lamp housing or similar enclosure. 2.4.1 Unenclase lampholder A built-in lampholder that requires additional installation (such as an enclosure) to meet the protection against electric shock requirements of this standard. 2.4.2 Enclosed lampholder An built-in lampholder that meets the protection against electric shock requirements of this standard and the corresponding external protection level classification requirements. 2.5 Independent lamp holder A lamp holder that can be installed outside the lamp independently and can provide all necessary protection measures consistent with its classification and marking. 2.6 Terminal/conitact assembly A component or assembly used to connect the power cord terminal to the lamp holder contact. 2.7 Outer ahell
GB17935-1999
A circular component used to prevent the user from contacting the lamp holder. The outer surface of the component may have (or have) a lampshade ring for mounting. 2.8 Screw shell
A circular component with Edison-type internal threads for fixing the corresponding lamp holder. In some lamp holder structures, the screw ring is permanently fixed to the shell or becomes an integral part with the shell. 2.9 Insulating ring
A circular component made of insulating material that is between the metal screw ring and the metal shell and separates the two. 2.10 Shade ring
A circular part with internal threads or other parts that can be engaged with the corresponding bracket on the outer lamp and can be used to fix the lampshade. 2.11 Dome
A part on a suspended lamp holder or a pipe-connected lamp holder used to protect the wiring connector. 2 Basic insulation basic insulation
An insulation measure taken for live parts to prevent electric shock. Note: Basic insulation does not have to include insulation dedicated to functional purposes. 2.13 Supplementary insulation supplementary insulation Another independent insulation measure outside the basic insulation taken to ensure that electric shock can still be prevented under the condition that the basic insulation fails.
A Double insulation dauble insulation
An insulation measure composed of basic insulation and supplementary insulation. 2.15 Reinforced insulation reinforced insulation A single insulation system taken for live parts, which provides the same level of protection against electric shock as double insulation under specific conditions. Note: The term "insulation system" does not mean that the insulation must be made of a single material. It can be made of several layers of materials that cannot be used alone for additional insulation tests or basic insulation tests.
2.t6 Live part
Conductive part that may produce electric shock,
2.17 Type test
One or a series of tests conducted on a type test sample in order to verify whether the design of a given product complies with the requirements of the relevant standards.
8 Type test sample type test aample2.1B
Several similar samples provided by the manufacturer or seller for type testing. 2.19 Semi-luminaire gemi-luminaire
A device similar to a self-ballasted lamp but capable of using replaceable light sources and/or starters. 2.20 Rated operating temperature ratedoperatingtemperature The maximum temperature required for the lamp holder design.
2.21 Minimum rated temperature ratedminimumtemperature The minimum temperature required for the lamp holder design (only applicable to lamp holders for refrigerators and food freezers). 3 General requirements
The design and structure of the lamp holder should ensure that the lamp holder performs reliably in normal use and does not pose a danger to the user and the surrounding environment. Generally, qualification is checked by carrying out all the specified tests. In addition, the housing of the independent lamp holder should also comply with the corresponding requirements in GB7000.1, including classification and marking requirements. 4 General requirements for tests
4.1 The tests described in this standard are all type tests. GB 17935—1999
Note: The requirements and tolerances specified in this standard are used for the inspection of type test samples. The qualification of type test samples does not guarantee that all products of the manufacturer comply with this safety standard. In addition to type tests, the manufacturer shall ensure the consistency of the products (including routine tests and quality assurance). 4.2 Unless otherwise specified, the lamp holder samples shall be provided and installed according to the normal use requirements, and the tests shall be carried out in an environment with a temperature of 20±5℃.
4.3 The total number of test samples is as follows:
Non-switch type lamp holder: 9 samples;
Switch type lamp holder: 12 samples.
Tests and inspections shall be carried out in the following chapter sequence: - 3 samples for the tests described in Chapter 112 (except 10.2) and Chapters 14 to 17; - 3 samples for the tests described in Chapter 13 (only for switch type lamp holders); - 3 samples for the tests described in Chapters 18 and 19. tt||E5 lampholder: 0.2 N·m;
E10 lampholder: 0.2 N·m;
E14 lampholder: 0.2 N·m;
E27 lampholder: 0.4 N·m;
E40 lampholder: 0.8 N·m.
4.5 Type E40 lampholders with a rated current of 32 A shall be tested based on their rated current value. 4.6 The lampholders are deemed to comply with this standard if they satisfy the whole series of tests specified in 4.3. If one specimen fails in a test, the test and any previous tests which may have influenced the result of the test shall be repeated on another number of specimens complying with the requirements of 4.3, the whole group of which shall comply with the requirements of the repeated test and any subsequent tests. If more than one specimen fails in a test, the lot of lampholders is deemed not to comply with this standard. NOTE In general, the tests concerned shall not be repeated unless a specimen fails in a test specified in clauses 18 and 19 or if there is a failure of the resilient face or the centre contact. In this case the tests specified in clauses 18 and 19 shall be carried out on a second set of three specimens. The applicant may submit for testing the additional set of specimens required in the event of a failure of one specimen together with the first set. The inspection body shall test the additional specimens without further request and shall declare the lot as nonconforming only in the event of new nonconforming specimens.
If the set of supplementary samples is not submitted at the same time, the failure of one sample will cause the entire batch of samples to fail. 5 Standard Rated Values
5.1 The standard rated voltages are 250V, 500V and 750V. For E14 and switch type E27 lampholders, the rated voltage allowable value is 250 V. For E5 lampholders and E10 lampholders connected in series with the power supply,The rated voltage shall not exceed 25 V and 60 V respectively. Note 1: These voltage values refer to the voltage between parts of different polarities. For E10 lampholders connected to the power supply alone, the rated voltage is only allowed to be 250 V. GB 17935-1999
Note 2: In special cases, this lampholder is also suitable for lamps connected in series. Due to the small number of lamps, the voltage of each lampholder is above 60 V. Except for the specified E5 and E10 lampholders, the rated voltage of the lampholder should not be less than 250 V. In addition, the rated voltage of the E40 lampholder can be 125 V. Compliance is checked by checking the marking. 5.2 The standard rated current is specified as follows:
--E5 lampholder: 0.2A
-E10 lampholder: 0.5A;
Lampholders for refrigerators and food freezers (with or without switches): 0.5A. For this type of lampholder, it is permitted to use the rated power of the lamp instead of the rated current. The power value of the lamp should be selected between 10 W, 15 W and 25 W! - E14 lampholder: 2A
- Parallel E27 lampholder: 2 A
- Other forms of E27 lampholder: 4A;
- E40 lampholder: 16A.
The rated current should not be lower than the standard value.
Compliance is checked by inspection mark.
5.3 E40 lampholders used on 125V equipment may have an additional nominal current of 32A. Compliance is checked by inspection mark.
5.4 The rated operating temperatures of lampholders for use under high temperature conditions (lampholders with temperature mark T) are as follows: E14 lampholder: not less than 140°C
E27 lampholder: not less than 170°C
E40 lampholder: not less than 230°C.
For lampholders used in the cold storage compartment of refrigerators and food storage cabinets, the rated operating temperature shall not be less than 80°C. For lampholders installed outside the cold storage compartment, the rated operating temperature values shall be the values given in the first paragraph of this clause. Note 1: The temperature mark values shall increase in increments of 10°C. Compliance is checked by inspection of the mark.
2: The rated operating temperatures of lampholders without temperature mark T are given in Table 12.1 of GB 7000.1-1996. Zhonghan, they are: -E14 lamp holder: 135C,
-E27 lamp holder: 165C
- -E40 Lamp holder: 225C.
6 Classification
Lamp holders are classified as follows:
6.1 According to the material of the external parts, they are divided into:
Insulating material lamp holders;
Metal lamp holders.
Note: Lamp holders whose external parts are partly made of metal and whose external parts are made of insulating materials but whose outer surfaces have a conductive layer (such as an outer lamp coated with a metal layer) are all considered to be gold lamp holders (see requirements in 12.3). This classification does not apply to threaded pipe nozzles and external parts that will not be energized even in the event of an insulation failure, such as a metal lampshade ring installed outside an insulating material lamp holder. Metal lamp holders with insulating layers should be metal lamp holders (see requirements in 9.5). To check whether the surface of the lamp holder is conductive, the following method should be used: two strip electrodes with a length of 25 mm and a width of 1.5 mm are placed in contact with the surface of the lamp holder (such as a surface coated with a silver conductive coating), and the two electrodes are 2 meters apart. min, and then measure the insulation resistance between the two electrodes according to the requirements of 14.4. If the insulation resistance is less than 5M, the surface is considered to be conductive. 6.2 According to the waterproof level, it is divided into:
* The nominal voltage can reach 130 V.
Ordinary lamp holder:
Anti-drip lamp holder.
6. 3 According to the installation method, it is divided into
-tube-connected lamp holder!
Suspension lamp holder,
-Flush-mounted lamp holder;
Other lamp holders.
GB 17935—1999
Note, other lamp holders can be lamp holders with mechanical suspension, such as lamp holders with hanging structures. 6.4 According to the type, they are divided into:
switch type lamp holders, which are equipped with switches to control the lamp power supply; non-switch type lamp holders,
6.5 According to the anti-electric shock performance, they are divided into:
distributed lamp holders:
-enclosed lamp holders!
independent lamp holders.
6.6 According to the heat resistance, they are divided into:
-lamp holders with rated working temperature reaching the limit value specified in 5.4, -lamp holders (with mark T) working under high temperature conditions. Marking
7.1 The lamp holder should be marked with the following marks (except E5 and E10 lamp holders): rated current, AI
For lamp holders used in refrigerators and food freezers, it is allowed to use the rated power of the lamp as a mark. If there is no rated power mark on the lamp holder, the corresponding manufacturer's instructions should be available. If the rated power mark is marked on the lamp holder, the mark should be located so that it cannot be confused with the power mark of the refrigerator. Rated voltage, V, rated pulse voltage higher than the following values, it should be marked: 2.5kV for lamp holders with a rated voltage of 250V,
Lamp holders with a rated voltage of 500V: 4kV;
Lamp holders with a rated voltage of 750V: 5kV.
When necessary, the current category symbol should be marked (only for switch type lamp holders); source mark (can be in the form of trademarks, manufacturer identification marks or seller names); - Model mark:
Waterproof grade, for drip-proof lamp holders (see 7.2 requirements) Rated operating temperature "T", indicating the maximum operating temperature applicable to the lamp holder. For lampholders used in the cold storage compartments of refrigerators and food freezers, the lowest rated temperature that the lampholder can withstand (e.g., -30°C) shall be marked. For lampholders whose outer filling is entirely made of ceramic material, the rated operating temperature need not be marked. If practicable, it may be marked on the lampholder or indicated in the manufacturer's catalogue. E10 lampholders shall be marked with the following markings: Rated voltage: V Source marking: Model marking: Waterproof grade. E5 lampholders shall be marked with the following markings: Source marking; Model marking. Compliance is checked by visual inspection. GB 17935—1999 Note: The model marking for E10 and E5 lampholders may be the catalogue number. 7.2 If symbols are used to indicate current and voltage, A indicates current and V indicates voltage. Note 1: The word "Rated current" can also be used alone to indicate current and voltage, that is, the whole word indicating rated current is marked before or above the number indicating rated voltage, and a short straight line or slash is used to separate them.
In this way, the markings of current and voltage are expressed in the following forms: 2A250V or 2/250 or 20 DC is represented by ----- (see GB/T5465.2). The waterproof grade symbol of drip-proof lamp holder is: IP×1. Note: The X in the IP number represents a blank number. Two appropriate numbers should be marked on the lamp holder in accordance with GB4208. The rated operating temperature mark T should be followed by the rated operating temperature value in Celsius. Compliance is checked by visual inspection.
7.3 The waterproof grade mark should be marked on the outer surface of the lamp holder. Compliance is checked by visual inspection.
7.4 The grounding terminal shall be indicated by a symbol (see GB/T5465.2). The symbol shall not be marked on a removable gasket or other movable parts.
Compliance shall be checked by visual inspection.
7.5 The marking shall be firm and durable and easy to identify. Compliance shall be checked by visual inspection and the following test: After the lamp holder has been tested as required by Chapter 19, lightly touch the mark with a cloth soaked in bacteria water 15 ε, and then wipe the mark with a cloth soaked in gasoline 15 9. After this test, the mark shall still be clear and easy to identify. In the past, the oil used contained a flux containing a maximum of 0.1% by volume of aromatic cyclic hydrocarbons, with a solubility of 29, an initial boiling point of about 65°C, a dry point of about 69°C, and a hardness of 0.6B g/cm. 8 Dimensions
B.1 Lampholders of type E10, E14, E27 and E40 shall comply with the requirements of QB 3590-1999. Compliance is checked by measurement.
When checking the minimum size and value of the threaded end, the gauges shown in QB/T3591-1999 shall be used. Lampholders of type E14 and E27 with round threads for lamp mounting rings shall comply with IEC60399 and their compliance shall be checked in accordance with IEC60399. 8.2 The lampholder shall allow all corresponding lamps to be inserted.and good contact. Compliance is checked by the gauges shown in QB/T3591-1999. Before checking E5 and E10 lampholders, the contact shall be checked using the corresponding lamp. For this purpose, it is recommended that the lampholder manufacturer submit lamps specifically for the lampholder.
The contact performance shall be checked after the submitted lampholder has completed the tests described in Clause 18 and 19.2. 8.3 The following relevant dimensions of the lampholder shall not be less than the values shown in Table 1: Table 1
Thickness of screw-on mouth
Screw-on without support
Screw-on supported by an insulating member with a total height not less than 3/4 of the circumference of the screw-on
Thickness of the elastic face or center contact
*For the function of the face contact in E40 lampholders, see requirement 12.11. E14
Compliance is checked by measurement.
GB179351999
Note 1: When measuring the thickness, a pointed dry ruler with a threaded screw is used. The measurement of the thickness of the screw mouth should be carried out on two groups of samples, three times for each group, and the average value of the six measurements should be at least equal to the specified value. Note 2: The requirements for the size are still under study. 8.4 The effective length of the threaded engagement between the lamp holder shell and its top cover (if any) shall meet the following requirements. The engagement portion shall be more than one full turn.
The effective length shall not be less than the value shown in Table 2: Table 2
Metal lamp holders
Rolled threads
Cutting screws
Insulating material lamp holders
If the lamp holder can withstand a torque equal to 1.2 times the torque value given in 15.2 when tested in accordance with 15.3, the effective length shall be at least 2 turns.
The above requirements do not apply to E5 and F10 lamp holders. Compliance is checked by measurement.
8.5 The threaded nozzle of the lamp holder shall have one of the following threads: E14 lamp holder: M10×1:
E27 lamp holder: M10×1, M13×1 or M16X1; E40 lamp holder. M13X1. M16X1 or (G3/8A) Note: Try not to use the specifications in brackets. In addition, the M10 threaded nozzle is mainly used for internal wiring of lamps. The threaded nozzle shall comply with the requirements of Figure 1a and Figure 1b.
This requirement does not apply to E5 and F10 lamp holders. Compliance is checked by measurement and using the gauge shown in Figure 2a or Figure 2b. In case of doubt, the gauge can be screwed into the threaded nozzle with a torque of 0.5N·m. 8.6 The dimensions of threaded nozzles and set screws which may be used in lampholders shall not be less than the values given in Table 3: Table 3
Nominal thread diameter
Thread length
Metal nozzles
Insulated nozzles
Set screw diameter
Head screws
Headless screws
One screw
One or more screws
A tolerance of 0,15 mm is permitted for the nominal thread diameter. Fit is checked by measurement.
This requirement does not apply to lampholders of types E5 and E10. M10x1
M13×1
M16×1
Note: If it is necessary to disassemble the lampholder to check whether it complies with the requirements of 8.3 ~ B.6, this test should be carried out after completing the tests described in Chapter 17
GB 17935-1999
8.7 The design of the lampholder should ensure that even if there is a slight dent in the lamp cap, the lampholder will not prevent the normal screwing in or out of the lamp. In any case, there should be no cutting edge on the contacts of the lampholder that may damage the lamp cap. Compliance is checked by the following test. For E27 type lampholders, the gauge shown in QB/T 3591-1999 should be used to check its compliance. For non-E27 type lampholders, visual inspection should be used to check its compliance. 9 Protection against electric shock
9.1 Lampholders of types E5, E10, E14 and E27 shall be designed so that the cap cannot be easily touched by a person when the lamp is fully screwed into the holder and the lamp becomes live.
Note: Details of the test of the protection of the lampholder against accidental contact with live parts during the application of the lampholder into E5 and E10 lampholders are under investigation. Therefore, E10 lampholders with a rated voltage exceeding 60 V are only available to manufacturers of lamps or other equipment. The protection against electric shock of such E10 lampholders may be provided by the lamp or equipment with which the lampholder is used.
Lampholders of type E40 shall be designed so that the cap cannot be easily touched by a person when the lamp is fully screwed into the holder. Lampholders of type E5 and E10 shall not be fitted with a decorative cover during the test unless such a cover would render the lampholder obviously unusable if removed. Compliance shall be checked as follows:
--For lampholders of type E10, the corresponding lamp and the standard test finger shown in Figure 16 shall be used for the test. The lampholder manufacturer shall provide lamps specific to the lampholder for testing;
--For lampholders of types E14, E27 and E40, the gauges shown in QB/T 3591-1999 shall be used for the test. 9.2 The external components of enclosed lampholders and free-standing lampholders shall be designed so that the live parts of the lampholder are not easily accessible to persons when the lampholder is ready for use and when fitted with the corresponding lamp in use. Candle lampholders shall not be fitted with decorative covers during the test unless such decorative covers, if removed, render the lampholder obviously unusable. Compliance shall be checked with the standard test finger. During the test: - a closed lampholder shall be mounted as in normal use, e.g. on a suitable threaded bracket or similar device and fitted with the most unfavourable conductor size specified for that type of lampholder; - a free-standing lampholder shall be mounted as in normal use on a suitable surface. The test is carried out by inserting the push-on test finger shown in Figure 16 with a force of 10 N in each position of the lampholder which may be touched and by using an electrical indicator to show whether live parts are in contact. It is recommended that the voltage used be not less than 40 V.
NOTE: This test may only be carried out on loose lampholders after the lampholder has been properly mounted in a luminaire or other auxiliary housing. 9.3 The parts of the lampholder which prevent accidental contact between the lampholder and the lamp cap shall be so fixed that they shall not fall off when the tightened lamp is removed or the lampshade is turned.
Compliance is checked by the following test:
First tighten the cap and the housing of the lampholder with a torque 2/3 times the value specified in the torque test below. Then apply a torque to the corresponding parts in an anti-clockwise direction according to the test value for 1 min. - Type E14 lampholder: 1 N·m;
--Type E27 lampholder: 2 N·m.
The lampholder is assembled as in normal use. Then the test lamp cap B of Figure 13 or the applicable test lamp cap shown in Figure 14 is screwed into the lampholder and the lamp cap is removed. After this test, the parts of the lampholder that prevent accidental contact between the lamp cap and the lampholder shall not fall off. Type E5 and E10 lampholders shall not be removable by hand without the aid of tools. This requirement for Type E40 lampholders is under study. 9.4 If the lampshade is to be attached to the lampholder, a separate device, such as a lampshade retaining ring, shall be used; the lampshade shall not be installed between the various protection against electric shock parts.
Compliance is checked by inspection.
GB17935—1999
9.5 External parts of drip-proof lampholders, lampholders for a rated voltage of more than 250 V, switch-type lampholders and E5 and E10 lampholders shall be made of insulated material, except for threaded nozzles and those parts which would not become live even in the event of leakage current. Paints and enamels are not considered to provide adequate protection for the purposes of this catalogue. Compliance is checked by inspection. wwW.bzxz.Net
1 Parts separated from live parts by double insulation or reinforced insulation are considered to be parts which would not become live even in the event of leakage current. 2 A metal lampshade retaining ring mounted on the housing of a pure-edge lampholder is an example of an external part which would not become live even in the event of a current change. 3 Switch-type lampholders may be fitted with external metal parts under the conditions specified in 12.3. 10 Terminals
10.1 Lamp holders shall be equipped with terminals that can receive wires with the following nominal cross-sectional areas, except for lamp holders equipped with connecting leads: E10 lamp holder: 0.5 mm~0.75 mm*; E14 lamp holder and E27 lamp holder with M10X1 threaded nozzle: 0.5 mm2~1.0 mm, other E27 lamp holders: 0.5 mm~2.5 mm; E40 lamp holder with rated current of 16 A: 1.5 mm2~4 mm; E40 lamp holder with rated current of 32 A: 2.5 mm to 6 mm. Compliance is checked by inspection and by the installation of conductors of the minimum and maximum cross-sectional areas specified above. For suspension lampholders, stranded conductors shall be used for E10 and E14 lampholders and E27 lampholders with M10×1 plastic threaded conduit ports. Solid conductors shall be used for all other lampholders. Pipe-connected lampholders shall be tested on threaded conduits. In the past, for E27 lampholders with non-screw terminals for use by manufacturers of luminaires or other similar equipment, all applicable nominal cross-sectional area requirements above do not need to be met.
10.2 Connections
10.2.1 The lampholder shall be equipped with at least one of the following connection components: a screw-type terminal,
a threadless terminal;
a push-type connection piece or plug;
a wire-wrap terminal;
a soldering lug,
a connecting lead.
Terminal screws and nuts shall have ISO metric threads, or threads of similar pitch and mechanical strength. Connection of conductors to E5, E10 and similar small lampholders may be by soldering, welding, crimping or other equivalent methods. Lampholders with threadless terminals shall have terminals suitable for both rigid (solid or stranded) conductors and flexible cables or cords, except for lampholders intended for sale to manufacturers of luminaires or equipment. Compliance is checked by carrying out the test of 10.2.2. 10.2.2 Terminals shall comply with the following requirements, which include limitations on internal wiring for free-standing lampholders and internal wiring for built-in lampholders in luminaires.
All terminal tests shall be made on separate samples that have not been subjected to any other tests. shall be made on separate samples that have not been subjected to any other tests. - Screw terminals shall comply with the requirements of 10.3 to 10.6 and 10.8. Screwless terminals shall comply with the requirements of GB7000.1-1996 Chapter 15, but the heating test must be carried out under the condition that the rated working temperature of the lamp holder is ±5°C. Push-type connectors or plugs shall comply with the requirements of GB7000.1-1996 Chapter 15. Wrap-type terminals shall comply with the provisions of GB/T2423.28. Wrap-type terminals are only used for single-strand solid round wires for internal wiring.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.