GB 17647-1998 Safety requirements for industrial dry cleaning machines
Some standard content:
GB 17647—1998
This standard is not equivalent to the American Underwriters Laboratory UL664-1993 "Safety Requirements for Industrial Dry Cleaning Machines". There is no safety standard for this product in the International Electrotechnical Commission (IEC) standard system. The American 1JL664--1993 is the current advanced foreign standard. Through this standard, the requirements of the structure, quota, standard, performance and process of this product ensure the safety of people and the whole machine, and gradually enter the international advanced level to meet the requirements of trade and communication. This standard has the following differences from UL664-1993: 1. Chapter 4 of the original UL664 standard, "referenced standards without standard dates", is a "referenced standard" that refers to my country's national standards and industry standards.
2. The original UI.664 standard inch 1 specifies the imperial system and its approximate measurement units. This standard changes to my country's unified legal measurement units, and selects material specifications in accordance with my country's standards.
3. In the original UL664 standard, the title of Figure 6.1, Figure 6.2 and Figure 6.3 is located directly above the figure. This standard changes the title to the bottom of the figure according to the requirements of GB/T1.1-1993.
4. Chapter 11 of the original UIL664 standard specifies that the insulation surface color of the grounding wire is white, gray or green. This standard changes it to yellow-green double color in accordance with GB4706.1. 5. The original UL 664 standard Chapter 30: Components that bear pressure should meet the requirements of various component standards in my country. 6. In the original UL664 standard Chapter 31, ① only stipulates that the fabric used for the test is cotton cover material, without specific requirements. The specifications and dimensions in the GB/T411 standard commonly used in industrial washing machinery standards are supplemented. ② The volume ratio is not specified. The volume ratio is an important indicator that affects performance, so the indicator to ensure performance is 18.5L.
7. The original UI, 664 standard Chapter 34 stipulates: Taiwan 37 The test voltage of motors below 3W or 250V is 1000V and the frequency is 60Hz. This standard is changed to meet the test voltage of GB4706.1, which is 1500V and the frequency is 50Hz. 8. Chapter 35 of the original UL664 standard stipulates that the ambient temperature is 30℃～40℃, the relative humidity is 80%90%, and the insulation resistance is not less than 50k. This standard is changed to meet the requirements of my country's standard ambient temperature of (10±2)℃, relative humidity of (93-)%, and the insulation resistance is not less than 2M. 9. The original UL All temperature rise values in Table 36.1 of Chapter 36 of the 664 standard are based on an ambient temperature of 25°C. This standard has been changed to comply with my country's regulations, and all temperature rise values are based on an ambient temperature of 40°C. All temperature rise values in Table 36.1 of this standard are 15°C less than the values specified in the UL standard.
From the date of implementation of this standard, JB8438-1996 "Safety Requirements for Dry Cleaning Machines" will be abolished at the same time. This standard was proposed by the State Machinery Industry Bureau. This standard is drafted by the Guangzhou Electric Science Research Institute of the Ministry of Machinery Industry. The responsible drafting unit of this standard: Guangzhou Electric Science Research Institute of the Ministry of Machinery Industry. The participating drafting units of this standard: Jiangsu Sea Lion Machinery Group, Shanghai Hangxing Machinery Group Co., Ltd., and Shangyou Sanling Industrial Washing Equipment Factory. The main drafters of this standard: Sun Xianglin, He Weien, Sun Enping, Zhang Ximin, Shi Xuecheng, and You Yu. This standard is entrusted to the Guangzhou Electric Science Research Institute of the Ministry of Machinery Industry for interpretation. GB 17647—1998
UL Foreword
A. This standard specifies the basic requirements for a class of products listed in the "Applicable Model" of this standard covered by the Underwriters Laboratory Case Tracking Service of the United States. These requirements are based on research, testing and records obtained from field experience based on reasonable technical principles and identification of problems existing in the manufacturing, installation and use processes. These identifications are based on information provided by manufacturers, users, inspection departments and other professionals, and the results of discussions with them. When more experience is accumulated and investigations and studies indicate that these requirements must or need to be modified, modifications will be made. B. Manufacturers' compliance with the requirements of this standard is one of the prerequisites for their products to continue to be listed and use the UL mark. C. A product that meets the requirements of this standard but is found to have some other performance that does not meet the safety level to be achieved by this standard during inspection and testing may be judged to be non-compliant with the requirements of this standard. D. A product, although the materials used or the structure it has are different from those specified in this standard, can still be inspected and tested according to the intent of the requirements of this standard. If it is confirmed that there is no substantial difference, it can also be judged to meet the requirements of this standard. E: UL does not assume or promise any responsibility to the manufacturer or any party in the process of fulfilling its duties in accordance with its purpose. UL's opinions and conclusions represent professional and technical judgments. This judgment is made after due consideration of the necessary conditions for actual operation and the level of technology when compiling this standard. UL shall not be responsible for anyone who uses or relies on this standard. UL shall not be liable for damages caused by the use, interpretation or reliance on this standard, or for damages caused by this standard, including direct damages and indirect damages. F. Many tests required by UL standards are inherently dangerous. Therefore, appropriate protective measures should be taken for personal and property when conducting such tests.
..comNational Standard of the People's Republic of China
Safety requirements for industrial dry-cleaning machines
Safety requirements for industrial dry-cleaning machines1Scope of application
GB 17647-1998
1.1This standard applies to industrial dry-cleaning machines with a rated voltage of 600V or less, AC and DC series motors with a rated voltage of 400V or less, fully enclosed and semi-enclosed, and non-flammable chemical synthetic solvents such as tetrachloroethylene solvent as washing solvents. 1.2This standard applies to dry-cleaning machines used in industrial laundry departments. These laundry departments generally do not allow the public to approach the operating dry-cleaning machines or dry-cleaning systems.
1.3This standard does not apply to coin-operated dry-cleaning machines and dry-cleaning systems using flammable solvents, because such dry-cleaning machines and dry-cleaning systems are accessible to or used by the public.
1.4 In this standard, dry cleaning machine refers to a piece of equipment used only to clean fabrics, or to clean and dry fabrics (generally excluding related equipment). If a piece of equipment is called a dry cleaning system, all components of the washing process and the drying process should be considered as a whole. Regardless of the type, all components and accessories of the dry cleaning machine or dry cleaning system and related equipment, such as cleaning liquid delivery pumps, recovery devices, air compressors, drying drums, etc., should be assessed in accordance with the relevant requirements of this standard and the standards applicable to these accessories and related equipment. Accessories are an integral part of the dry cleaning system or an independent device, but they must be assessed as related components. 1.5 A product that has new characteristics, features, components, materials or systems that are different from those promulgated in this standard, or that involves hazards such as fire, electric shock or personal injury, shall be evaluated in accordance with the relevant accessories and final product requirements determined by this standard for the safety level that the product must maintain.
2 Components
2.1 Components in products within the scope of this standard shall comply with the requirements of the corresponding standards for the components except for 2.2. 2.2 A component does not need to comply with the requirements of its corresponding standards in the following cases: a) Requirements involving characteristics or features that are not required when the product within the scope of this standard uses the component; b) Requirements that are superseded by another requirement of this standard. 2.3 Components shall be used in accordance with the rated values specified by the conditions of use. 2.4 Special components are components with incomplete structural characteristics or limited performance. Such special components can only be used under specified conditions, such as not exceeding a certain specified temperature. 3 Units of measurement
3.1 The units of measurement in this standard are legal units of measurement. 4 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB150--1989 Steel pressure vessels
Approved by the State Administration of Quality and Technical Supervision on December 21, 1998, implemented on October 1, 1999
GB/T411-1993 Cotton printed and dyed fabrics
GB17647-1998
GB4706.1-1998 General safety requirements for household and similar electrical appliances (eqy1FC335-1:1991)GB6654-1996 Steel plates for pressure vessels
GB14711-1993 General safety requirements for small and medium-sized rotating electrical machinesGB/T 16839, 1-1997
Thermocouples Part 1: Dividing tables (idtIEC584-1:1995)GB/T16839.2-1997 Thermocouples Part 2 Tolerances (idtIEC584-2:1982) Structure
5 General
5.1 Dry-cleaning machines shall be made of materials that meet the requirements of their use. 6 Frame and casing
6.11 The structure and assembly of the dry-cleaning machine shall have sufficient strength and rigidity to withstand the stresses it normally encounters, and shall not cause loosening, displacement, narrowing of gaps or other serious malfunctions due to damage, and shall not cause dangers such as fire, electric shock or personal injury. 6.2 The exterior of the dry-cleaning machine shall be made of materials that have been proven to meet the requirements of its use and shall be able to completely cover all parts that may cause dangers such as fire, electric shock or personal injury under any conditions of use. Exception: The main casing of the machine may be omitted if the dry-cleaning machine is to be installed in the following situations: 1) Installed together with other equipment that can form part of the complete casing 2) Be equipped with instructions for correct installation. See 45.5, 45.12 and 45.22. 6.3 When assessing compliance with the requirements of 6.2, the housing, shell or combination of the two of each electrical component should be checked. 6.4 When assessing the compliance of the housing, the following should be assessed: a) Mechanical strength; h) Impact resistance; c) Moisture absorption performance; d) Flammability; e) Corrosion resistance: f) Anti-deformation performance of the housing when subjected to temperature changes under normal or abnormal conditions of use. In addition to the above factors, the thermal aging performance should also be assessed for non-metallic housings. 6.5 The thickness of the metal casting housing of electrical components at any point should not be less than 3.2mm. The thickness at the edges of the ribs and doors should be greater than 3.2mm, and the thickness at the pipe connection hole should not be less than 6.4mm. However, at the pipe connection hole, the die-cast metal parts shall meet the following requirements:
a) The area is greater than 610 mm2 or any dimension is greater than 152 mm, the thickness shall not be less than 2.4 mm1b) The maximum area is 610 mm\ and any dimension is not greater than 152 mm, the thickness shall not be less than 1.6 mm. If reinforcing ribs are provided and the area is subdivided by the area, the area can be limited to the above range. 6.6 The thickness of the outer shell of electrical components made of metal plates shall not be less than the specified value in Table 6.1, but the thickness of the uncoated steel and galvanized steel plate outer shell at the connection of pipelines or armored cables shall not be less than 1.0 mm, and the thickness of the outer shell of non-ferrous metals shall not be less than 1.1 mm. ..com Large area of any surface
30 480
Maximum size
1) Including stainless
GB17647-1998
Table 6.1 Thickness of metal plate for external filling
Maximum thickness of gold plate, mm
No supporting frame
No coating
Galvanized plate
2) The volume of the external waste is not more than 304.8mm. Steel plate
With support frame or equivalent reinforcement
Uncoated
Galvanized sheet
6.7 The thickness of the casing at the point where the power plug enters the socket shall not be less than: a) 1.0 mm for ferrous metal casing;
b) 1.0 mm for non-ferrous metal casing
c) 2.5 mm for insulating material casing.
Except: The thickness of insulating material casing may be reduced if it has sufficient mechanical strength or is strong. Red steel, brass or aluminum
Unsupported
With support frame
Or equivalent reinforcement
6.8 The support frame or reinforcement that meets the requirements of Table 6.1 does not necessarily have to connect all edges to form a complete frame, but there must be enough to support all surfaces. 6.9 Unless the conditions of use of the electrical components of the dry cleaning machine determine that the enclosure must have ventilation holes, and the test proves that the electromagnetic interference can be limited to the outer shell. Otherwise, the outer shell of the component shall not have ventilation holes. The enclosure or box containing fuses or tear-off circuits shall not have ventilation holes except for the operating handle holes.
6.10 The electrical components of the dry cleaning machine shall be properly positioned or properly sealed to prevent accidental contact with uninsulated live parts. See 7.3. 6.11 According to the requirements of 6.10:
a) Holes that cannot be entered by a test rod with a diameter of 19.0 mm are acceptable under the following conditions. 1) When the test rod shown in Figure 6.1 is inserted through the support, the test rod cannot touch the uninsulated live parts; 2) When the test rod shown in Figure 6.2 is inserted through the hole, the test rod cannot touch the film effect line. b) Under the conditions specified in Figure 6.3, holes that can be entered by a test rod with a diameter of 19.0 mm are acceptable. Any suitable length
Test rod for measuring uninsulated live parts Figure 6.1
GB 17647—1998
Any suitable length
Figure 6.2 Test rod for measuring film-coated wires Outside
Live parts
Surface A—A
Live parts
Section Bb
Figure 6.3 Holes in enclosure
Hole is acceptable in the following cases if uninsulated live parts or film wires are provided in the enclosure. 1) The distance from the periphery of the hole is less than × mm
2) Within the volume formed by the projection of a plane perpendicular to the periphery to a diameter of X mm. X is equal to times the diameter of the test rod with the largest diameter that can be inserted into the hole, but not less than 101.fmm. 6.12 If the area of each mesh of the ventilation filter is not larger than 323 m2, the diameter of the metal wire of the filter shall not be less than 1.3 m2; for larger meshes, the diameter of the metal wire shall not be less than 2.0 mm. 6.13 Except as stated in 6.14, the thickness of porous steel plates or steel plates used to make expanded steel mesh for ventilation holes, where the area of each mesh is not larger than 323 m2, shall not be less than 1.1 mm for uncoated plates and galvanized plates; when the area of the mesh is larger, the thickness shall not be less than 2.0 mm for uncoated plates and 2.1 mm for galvanized plates. 6.14 In devices where the depression of the shield or housing does not change the gap between the uninsulated live active parts and the grounded metal, does not affect the performance, and does not reduce the gap below the value specified in Table 24.1, the thickness of the unlayered steel sheet used for the expanded metal shall not be less than 0.5 mm; the thickness of the galvanized steel sheet shall not be less than 0.6 mmtn if the following conditions are met. The exposed expanded metal on any side or any surface of the device protected by the expanded metal has a side that is not less than 4 cm and H has no dimension greater than 305 mmt
b) The width of the hole protected by the expanded metal is not greater than 89.0 mm6.15 The arrangement and protection of dry cleaning machine parts shall allow filters and containers to be easily installed and removed, and shall allow the removal, cleaning, replacement or refilling of the filled containers by the dry cleaning machine operator. The handling and replacement of these containers and their accessories shall not cause damage to wiring, electrical components or other parts.
GB 17647--1998
6.16 The installation of dry cleaning machines should minimize the splashing of liquids, powders, etc. onto non-insulated parts. 6.17 Moving parts, such as motor rotors, pulleys, belts and gears, should be enclosed or other measures should be taken to prevent human fatalities.
6.18 The degree of protection required by the housing depends on the overall structure and use requirements of the dry cleaning machine. When determining whether the exposed moving parts meet the requirements, the following factors should be considered:
8) The degree of exposure,
b) The sharpness of the moving parts:
c) The possibility of accidental contact with these moving parts; d) The speed of movement of those parts:
e) The possibility of human fingers, arms, and clothes being caught in the moving parts at the meshing of gears, belts, pulleys, etc.
7 Overcurrent or overload protection device
7.1 Protective devices that must be replaced, such as fuses, should be located in an easily accessible place. 7.2 The screw seat of the plug-in fuse holder should be connected to the load. 7.3 Unless the dry cleaning machine has been marked with 45.25, the non-insulated live parts of the fuse holder, except for the screw seat, terminals, fuse clips, etc., shall not be touched by debugging and maintenance personnel. 7.4 The fuse holder, signal light, circuit breaker operating handle, etc. should be easy to operate during maintenance, but the live parts should not be exposed. 7.5 When the door or cover of the dry cleaning machine is in the closed state, the operating handle of the circuit breaker should be absolutely impossible to touch from the outside of the dry cleaning machine. The operating button of the manual protector of the motor and similar parts can extend outside the casing, see 6.9. 7.6 Doors or openings of the enclosure which provide access to an overload protection device which needs to be replaced or which must be opened when the protection device is in operation shall be mounted by hinges or by an equivalent method. Provision shall be made to maintain the door or cover above the fuse holder in the closed position, and such door or cover shall be a tight fit. 8 Mechanical assembly
8.1 The dry-cleaning machine shall be assembled or so assembled that it will not be adversely affected by vibration during normal operation, see 37.2.1 and 37.2.2. Brushes shall be screwed or otherwise secured to prevent them from loosening. 8.2 Switches, lamp holders, sockets for power connectors, power connectors for motors, or similar components shall be securely fastened to prevent them from loosening by rotation. Exceptions 1. This requirement does not apply if the following conditions apply! a) The switch is a plunger switch or other type of switch that does not rotate when operated (a switch is considered to be subject to forces that may cause the switch to rotate during normal operation),
b) The switch is mounted so that it will not become loose due to the operation of the switch; c) If the switch is rotated, the gap will not be reduced to below the minimum allowable value; d) The switch is operated by mechanical means rather than by direct human contact. Exception 2: Lamp holders where the bulb cannot be replaced (such as atmospheric signal lamps or indicator lamps, which are sealed in non-removable brackets) do not need to be prevented from rotating if rotation does not reduce the gap to below the minimum allowable value. The means for preventing rotation required by 8.38.2 should not be merely friction between surfaces, but should also include other means, such as the proper use of locking washers (Figure 1). It may be a means to prevent the rotation of small fixed switches or other devices with single-hole mountings. 9 Stability
9.1 The washing machine shall have a means of fixing to the floor. If the washing machine is required to be fixed to a base, it shall have a means of fixing to the base. ..com10 Anti-corrosion protection
GB 17647—1998
10.1 Iron and steel parts shall be protected from rust by spraying, bonding, coating or other acceptable methods. Exception: This requirement does not apply to:
a) bearings, balancing weights, laminates or small parts made of steel (such as rings, screws, etc.); b) other accessories made of iron that will not cause fire, electric shock or personal death even if rusted; c) the inner surface of containers for loading or conveying liquid solvents. 11 Power connection
11.1 General
11.1.1 The dry cleaning machine shall be equipped with wiring terminals or leads for field connection and shall be equipped with devices applicable to the wiring system of the dry cleaning machine in accordance with Chapter 25 of GB4706.1-1998. 11.2 Junction box
11.2.1 The junction box for connecting the power cable shall be prevented from rotating. 11.2.2 The junction box or outlet box used to connect the power supply circuit should be located in a place where the connection of the junction box can be checked at any time without moving the dry cleaning machine after the dry cleaning machine is installed according to the predetermined requirements. 11.2.3 The location of the junction box described in 11.2,2 should ensure that it will not be subjected to mechanical stress during the connection of electrical components and internal wiring.
11.2.4 Where it is specified that the power supply is directly connected to the motor of the dry cleaning machine, its junction box shall comply with the requirements for junction boxes in GB 14711. 11.3 Terminals and Leads
11.3.1 The terminal blocks or leads described in 11.1.1 shall be suitable for connecting wires with a current not less than the following a) branch circuit ratings marked on the dry cleaning machine in accordance with the requirements of 45.15 or 45.18, b) if there is no mark specified in 11.3.1a), then the current rating of the dry cleaning machine. 11.3.2 Terminals used only for connecting the grounding conductor of the equipment shall be able to firmly fix the wire of the size that meets the requirements of its use. 11.3.3F washing machines, which can be used for any of two different power supply voltages after installation, for example, for 220V two-wire or 220V/380V three-wire, shall have appropriate devices to enable the corresponding connection to be made during on-site installation! When changing the connection point, it is not necessary to change or interrupt the internal wiring or other connections. 11.3.4 The terminal shall be equipped with a welding wire clamp or pressure wire presser, such as bolts or screws to firmly fix them in the normal position. The connection device welded with low-temperature solder shall not be used to connect the grounding conductor of the equipment. Exception: For terminals connecting 5.3mm or thinner wires, as long as there is a terminal screw, they can be used as long as there is a terminal screw.
11.3.5 The terminal shall be prevented from turning.
11.3.6 The terminal screw shall be screwed into the metal. 11.3.7 The terminal screws on the terminal block shall be not less than M3. 11.3.8 The terminal block tapped for the terminal screws shall be made of metal, the thickness of the metal plate shall be not less than 1.3 mm, and the tapped hole shall have at least two full turns of thread.
Exception: If the tapped thread has the corresponding mechanical strength, a terminal block with a thickness of not less than 0.8 mm may be selected. 11.3.9 To obtain the required thickness of one or more turns of thread, the metal of the tapped hole of the terminal block may be extruded, but there is no The thickness of the metal plate to be squeezed shall not be less than the pitch of the screw thread. 11.3.10 The inverted retaining ring or cup washer shall be able to retain the wire of the size described in 11.3.1, but not less than 2.1mm*, under the screw head or washer.
11.3.11 In dry cleaning machines, where it is intended to be connected to a power line with a grounding wire, the parts shall be equipped with: a) screw-type lamp holder;
b) single-pole switch;
c) single automatic controller
d) ballast.
GB 17647--1998
And if it is marked and specified to be connected to the yellow-green line conductor, there should be a marked terminal or lead for the special purpose of connecting the grounding wire of the power circuit. The marked terminal or lead should be connected to the screw socket of the lamp or component, and connected to the fluorescent green line conductor of the ballast, and must not be connected to a single-pole switch or single-stage automatic controller marked with a disconnect position. See 22.8. 11.3.12 The grounding terminal used to connect the power line should have a yellow-green mark. This terminal should be distinguished from other terminals; or it should be clearly shown in some way, such as a wiring diagram near the terminal, that the terminal is a dedicated grounding terminal for connecting the power line.
11.3.13 The grounding terminal used to connect the equipment should be a copper hexagonal terminal bolt. Used to connect this The wiring terminals of the wires should have obvious identification marks, for example: marked with \G\, "GR", and marked with the 1 symbol. Or mark it on the wiring diagram of the dry cleaning machine. The wiring screws or terminals should be located where they will not fall off during maintenance of the dry cleaning machine. 11.3, 14 The surface of the lead used to connect the grounding wire in the power cord should be two-color with yellow edges, and it should be clearly distinguished from other leads. 11.3.15 For connecting the grounding wire of the equipment, the surface of the insulated lead should be two-color green. 11.3.16 The grounded insulation surface of the yellow-green wire shall not be used for internal wiring of the junction box. 11.3.17 For circuit connection wires between components, the free length shall not be less than 152mm. Exception: If it can be clearly seen that a lead with a free length exceeding 152mm will cause a fire or electric shock hazard, the free length of this lead can be less than 152 mm,
11.3.18 The lead wire used for field connection of power conductors shall not be less than 0.82mm, and the thickness of rubber insulation or thermoplastic insulation shall not be less than 0.8mm.
12 Internal wiring
12.1 The internal wiring and connections between the dry cleaning machine components shall be sealed. 12.2 The internal wiring mentioned in the above requirements refers to all interconnections between the wiring terminals used for power connection of the dry cleaning machine and various electrical components and loads.
12.3 The insulated internal wiring, including the grounding wire of the equipment, shall meet its use requirements unless it is determined to be a non-insulated live part, and the following factors shall be included in the assessment of whether it meets the requirements: a) The temperature and voltage that the wiring may encounter; b) Contact with oil, grease, detergent or other substances that have an adverse effect on insulation; c) Moisture t
d) Other conditions that may be encountered during maintenance. 12.4 Internal wiring shall use wires that meet the requirements of electrical wire standards, and the insulation thickness of the wires shall not be less than 0.8mm thermoplastic insulated wires or chlorinated rubber insulated wires.
Exception 1: For braided wires or wires with sheaths, if the braiding layer or sheath thickness is not less than 0.4mm, the insulation thickness may not be less than 0.4mm.
Exception 2: In circuits operating at a voltage not greater than the rated voltage of the wire, and the wiring is in an independent, fully sealed electronic baseboard that does not need to be opened during replacement or normal on-site adjustments, electrical wiring materials without a braiding layer or sheath and an insulation thickness of not less than 0.4mm may be used.
12.5 Rubber insulated wires used for internal wiring shall be braided wires, and their insulation thickness shall not be less than 0.8mm. Exception, among electrical wiring materials, if the insulation is non-silicone rubber-type heat-resistant rubber and the thickness is not less than 1.2mm, even without a braided layer, can be used for internal wiring.
12.6 Unless the dry cleaning machine is equipped with electric heating elements and the wires will encounter a full degree of more than 80 degrees, otherwise, asbestos yarn-wrapped wires shall not be used for insulation. Because the wires will be damp, including contact with condensation caused by the operation of the dry cleaning machine. GB176471998
12.7 The internal wiring of the dry cleaning machine should be installed in armored cables, cable guide arms and electrical metal tubes, or protected by other means to avoid mechanical damage
12.8 The wiring should avoid sharp edges (including screw threads), weld scars, burrs, moving parts, etc. to prevent wear of the insulation layer of the wire. 12.9 The holes for insulated wires on the metal plate of the whole machine housing should be equipped with finely rounded sleeves, or should have a smooth and flat surface. There should be no weld scars, burrs, sharp edges, etc. in contact with the wires to prevent wear of the insulation. 12.10 Insulated wires may be bundled and inserted into a hole in the metal plate of the dry cleaning machine housing. 12.11 All connecting wires and connecting wires shall be mechanically fixed and their electrical contact shall be reliable. Welding wires shall be mechanically fixed before welding. Wires inserted into the terminal holes shall be deemed to be mechanically fixed regardless of whether they have been bent before welding. 12.12 Spring retaining rings shall be placed under the heads of terminal screws or nuts to prevent loosening due to vibration, which may cause fire, electric shock or personal injury.
12.13 Open flat washers are not acceptable unless there is an attached device (e.g., a retaining ring) to keep the open flat washers in place in the event of loosening of the terminal screws or nuts. 12.14 If a permanent gap cannot be maintained between the connecting wire heads and other metal parts, the connection shall be equipped with insulation equivalent to the insulation of the connected wires.
12.15 If the voltage at the connection is less than 250V, the insulation at the connection may consist of two layers of abrasion-resistant insulating tape, or two layers of thermoplastic tape, or one layer of rubber insulation and one layer of abrasion-resistant insulating tape. In determining whether the insulation of a connection consisting of varnished cloth, thermoplastic material or other types of insulating tubes is acceptable, factors such as insulation performance, heat resistance, and time resistance should be considered. It is unacceptable to wrap only the sharp edges with thermoplastic tape.
12.16 The connection of the internal strands to the device with the terminal screws should prevent the strands from contacting other live parts of opposite polarity or non-live metal parts. To achieve this requirement, devices such as pressure connectors, welding wire clamps, crimping iron rings, or other reliable methods such as welding the wire strands together can be used. 13 Isolation of field connection lines
13.1 The structure of the dry cleaning machine should ensure that the field connection wires of the Y-type connection circuit specified in Chapter 25 of GB 4706.1-1998 are separated from the wires of other circuits that do not belong to the Y-type connection by a partition or 6.4m. 14 Live parts
14.1 Live parts should be made of silver, copper, copper alloy or other materials that meet the requirements of use. 14.2 Live parts made of electroplated iron or electroplated steel can be used in the following situations: a) when the temperature exceeds 100℃ during normal use; b) in the motor or auxiliary regulator, c) in accordance with the requirements of 2.1.
However, unbonded steel or iron shall not be used to manufacture the above-mentioned live parts. This requirement does not apply to stainless steel or other corrosion-resistant alloys. 14.3 To prevent the rotation or displacement of non-insulated live parts, they shall be firmly fixed to the base plate or mounting surface.
14.4 The method of preventing the rotation of live parts by friction between surfaces is unacceptable, but the correct use of locking washers to prevent the rotation of live parts is acceptable.
15 Electrical Insulation
15.1 Insulating washers, bushings and base plates or brackets for mounting live parts shall be made of moisture-proof materials that will not be damaged by the temperatures encountered in actual use, such as ceramic, phenolic or cold-pressed composite materials, or other materials that have been proven to meet the requirements of use. 15.2 The insulating material used in dry cleaning machines is stainless steel and should be evaluated according to the requirements of its special use. Some materials, such as mica, certain molded compounds, or certain refractory materials, are usually used as supports for live parts. Other materials, such as magnesia, stone wool, etc., which cannot be used, are acceptable if used with other more compatible materials and are positioned or protected sufficiently to prevent mechanical damage and do not absorb moisture. If they must be tested to determine whether they are qualified, they should be tested for mechanical strength, dielectric strength, insulation resistance (see 35.1), heat resistance, degree of sealing, degree of protection, and all other characteristics related to the hazards of fire, electric shock, personal injury, etc. under actual conditions of use. All of the above characteristics should take into account the effects of thermal aging. 15.3 Screws or other purple fasteners used to mount or support small and fragile insulating materials should not be tightened too much to prevent them from cracking or breaking due to expansion and contraction.
15.4 For ordinary hardened paper, if shrinkage, moisture absorption, deformation may lead to leakage, or cause fire, electric shock or personal injury, it can only be used as insulating sleeves, washers, partitions, and interlayers, but it shall not be used as a dedicated support for non-insulated live parts. Thermoplastic materials are generally considered unsuitable for use as support base plates for non-insulated live parts, but if they are proven to have sufficient mechanical strength and rigidity, heat resistance, flame spread resistance, dielectric strength or other properties that meet the requirements of use, they can also be used to manufacture the above-mentioned supports. The effects of thermal aging should be taken into account when describing these properties.
15.5 Small molded parts such as terminal blocks should have sufficient mechanical strength and rigidity to withstand various stresses in actual use. 16 Thermal Insulation
16.1 Flammable or conductive thermal insulation materials shall be protected from contact with uninsulated live parts. 16.2 Certain glass wool materials described in 16.1 shall not come into contact with uninsulated live parts when used with conductive impurities such as slag.
17 Motors
17.1 Motors shall meet the requirements for their use and shall be able to withstand the maximum normal load of the dry cleaning machine specified in 36.2 without the risk of fire, electric shock, or personal injury. bzxz.net
17.2 Motor windings shall not absorb moisture. Film-coated conductors do not require additional moisture-proof treatment, but fiber pads, cloth insulation tapes for coils, and similar moisture-absorbing materials shall be impregnated or otherwise treated to prevent moisture absorption. 18 Overcurrent and Overload Protection
18.1 Motors for dry cleaning machines shall be equipped with overheating or overcurrent protection. During normal operation, these protective devices shall not open the circuit and shall not cause a risk of fire, electric shock, or personal injury. 18.2 Motors equipped with thermal protectors or impedance-protected motors that comply with the requirements for such motors shall be deemed to have complied with the requirements of 18.1 without further testing. 18.3 Fuses shall not be used as motor overload protection devices, except in the following cases: a) If the motor is protected by a time-delay fuse, a fuse holder with the highest ampere rating shall be installed. b) The fuse holder shall be permanently marked to indicate that a time-delay or fast-acting fuse of the corresponding rating is to be used. 18.4 Fuse holders or fuses shall comply with the requirements for their use. Plug-in fuse holders shall be S-type or shall be screw-in fuse holders with a factory-installed, non-removable S-type adapter.
18.5 If the handle of the circuit breaker is operated vertically rather than rotating or horizontally, the upward position of the handle shall be the on position. 18.6 If a dry cleaning machine is equipped with one or more general-purpose power plug sockets, and the dry cleaning machine is connected to a branch circuit, the overcurrent protection capacity of the branch circuit exceeds the protection capacity required for the socket or sockets. Each socket circuit that is a component of the dry cleaning machine should have an overcurrent protection capacity of no more than 20A. 18.7 If the dry cleaning machine is a component of the following, each internal circuit conductor should be equipped with overcurrent protection: a) The current rating of the dry cleaning machine exceeds 40A; b) There are two or more motors, motor control circuits or electric heating elements connected in parallel at both ends of each pair of power supply mains terminals.
Exception: In each component of a dry cleaning machine, the following conditions do not require additional overcurrent protection: GB 17647--1998
a) Motor or heating element circuit powered by insulated wires, and the current carrying capacity of the insulated wires is at least 1/3 of the current carrying capacity of the branch circuit protection device connected to the dry cleaning machine;
b) Motor control circuit powered by insulated wires, and the current carrying capacity of the insulated wires is at least 1/5 of the current carrying capacity of the branch circuit protection device connected to the dry cleaning machine.
18.8 The fuse used for motor operation overcurrent protection should be connected to each phase circuit. If it is a three-wire three-phase AC motor, it should be connected to each phase of the three phase lines.
18.9 For overcurrent protection devices used for motor operation, except for those inherent in the motor, all other devices should be connected to each phase circuit. 19 Electric heating elements
19.1 Electric heating elements should be firmly fixed and protected to prevent mechanical damage or contact with other parts. 19.2 The structure of the dry cleaning machine should ensure that the fabric load is reliably enclosed in the drum and prevent the fabric from contacting the electric heating elements or other parts where the working humidity can cause the fabric to catch fire. 19.3 The electric heating elements should have interlocking devices to avoid fires caused by airflow or rotating parts. If the test according to 37.1.2 can prove that there is no fire hazard, the interlocking device may not be installed. 19.4 The minimum voltage rating of the electric heating elements used in the washing machine shall comply with the provisions of Table 19.1. Table 19.1 Voltage ratings of heating elements
Nominal voltage of the circuit, V
20 Lamp holders
20.1 The connection method of the screw lamp holder shall comply with the requirements of Table 11.3.11. Low voltage ratings of heating elements V
Ratings of circuits
20.2 The structure or installation of the lamp holder shall ensure that: except for the need to use tools to remove the cover or other removable parts of the dry cleaning machine, replace the bulb or screw lamp cap, other non-insulated parts will not be touched by normal maintenance personnel. 21 Sockets
21.1 Sockets used as power plugs for general purposes shall be of the grounding type. 21.2 The surface of the socket shall:
a) be flush with or protrude from the surrounding non-conductive surface; b) protrude from the surrounding conductive surface by not less than 0.4 mm. 22 Switches and controls
22.1 The positioning or protection of switches shall not be mechanically damaged during normal use. 22.2 Controls - When the switch for one or more heating elements is opened, all ungrounded conductors of the supply circuit shall be disconnected. 22.3 The current and voltage ratings of the switch shall not be less than the corresponding ratings of the load controlled by the switch when the dry-cleaning machine is in operation. 22.4 The voltage and power ratings of a switch or other device controlling a motor shall not be less than the corresponding ratings of the motor it controls. 22.5 The voltage and volt-ampere ratings of a switch or other device controlling a contactor, relay coil, or other electromagnetic device shall not be less than the corresponding ratings of the motor it controls.
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