GB 3883.1-1991 Safety of hand-held power tools Part 1: General requirements (available for certification)
Some standard content:
National Standard of the People's Republic of China
Safety of hand-held motor-operated electric tools
Part 1: General requirements
Safety of hand-held motor-operated electic toolsPart 1: General requirements (available for certification )
GB3883.1-91
IEC745-
replaces GB3883.1-83
This standard is equivalent to the international standard IEC745-1 "Safety of Handheld Power Tools" Part 1 General Requirements". This standard is divided into two parts:
Part 1: General Requirements, consisting of general characteristic requirements. Part II: Special Requirements, covering specific types of tools. The provisions of these special requirements supplement and amend the corresponding provisions of Part One. In the second part of the content, where the relevant requirements, test specifications or instructions of the first part are “added” or “replaced”, these are changes to the corresponding content of the first part, and the changed text is an integral part of the standard. Where no changes are required, the words "This chapter of Part One applies" are used in Part Two. This standard applies to a specific type of tool only if Part II exists for that type of tool. Then, as long as it is reasonable, the application of this standard to tools not mentioned in Part 2 and tools designed based on new principles may be considered. Reference standards:
GB8898 Safety requirements for household and similar general-purpose electronic and related equipment powered by grid power supply GB4706.1 General safety requirements for household and similar-purpose electrical appliances GB5013 Rubber insulated flexible cables with rated voltage 450/750V and below Rated voltage 450/750V and below Polyfluoroethylene insulated cable GB5023
GB11918
General requirements for industrial plugs, sockets and couplers IEC309 Appliance connectors for household and similar purposes IEC1029 Appliance switches Part 1 General requirements IEC83 Plugs and sockets for household and similar purposes IEC85
Classification standard for thermal stability of motors and electrical appliance insulation materials in use 1 Scope of application
1.1 This standard applies to electric motors for indoor or outdoor use Or electromagnet-driven hand-held tools or hand-held power tools (hereinafter referred to as tools), which can be installed on a bracket and used as a fixed tool without any modifications, fall within the scope of application of this standard.
Tools equipped with electric heating elements fall within the scope of application of this standard, but such tools should also comply with GB4706.1, as long as they are used reasonably.
Specific requirements for battery-powered tools will be specified in Part 2, but requirements regarding machine safety still apply to these tools.
Special requirements for replacement tools (see definition 2.2.16) are under study. In addition, the requirements of this standard apply wherever applicable to replacement tools.
State Bureau of Technical Supervision approved 1992-02-01 implementation on 1991-05-27
GB3883.1-91
For tools intended for use on ships or aircraft, additional Requirements; Special construction may be required for tools used in hazardous locations, such as those prone to explosions. For tools intended for use in tropical countries, special requirements may be required. 1.2 This standard is concerned with safety aspects and takes into account the safety implications of the components required to achieve the required level of suppression of radio and television interference.
2Definitions
2.1 Unless otherwise specified, wherever the terms "voltage" and "current" are used, they refer to the effective value. 2.1.1 In this standard, wherever the words "with the help of tools", "without the help of tools" and "requiring the use of tools" appear, the word "tool" refers to a screwdriver, a coin or any other tool that can be used to remove Install screws or similar fasteners. 2.2 The following definitions apply to this standard:
2.2.1 rated voltage
The voltage specified by the manufacturer for the tool (for a three-phase power supply, this voltage is the line voltage). 2.2.2 Rated voltage range ratedvoltagerange The voltage range specified by the manufacturer for the tool, expressed by its upper and lower limits. 2.2.3 Working voltage workingvoltage
The maximum voltage that the involved parts may be subjected to when the tool is operated at rated voltage and normal use. Note: Normal use conditions include voltage changes in the tool caused by possible accidents such as circuit breaker action or lamp damage. When judging the operating voltage, the influence of the instantaneous voltage that may occur on the power supply main line is not considered. 2.2.4 Rated input power ratedinput
The input power at rated voltage specified by the manufacturer for the tool. 2.2.5 Rated current ratedcurrent
The current specified by the manufacturer for the tool at the rated voltage or the lower limit of the rated voltage range. Note: If the current is not specified for the tool, then for the purpose of this standard, the rated current is based on calculations of the rated input power and rated voltage and/or current measurements when the tool is operated at rated voltage under normal load and normal operating temperature. Sure. 2.2.6 Rated frequency ratedfrequency
The frequency specified by the manufacturer for the tool.
2.2.7 Rated frequency range The frequency range specified by the manufacturer for the tool is expressed by its upper and lower limits. 2.2.8 Rated no-load speed ratedno-load speed refers to the no-load speed specified by the manufacturer for the tool at the rated voltage or the upper limit of the rated voltage range. 2.2.9 Detachable flexible cable or cord detachableflexiblecableorcord A flexible cable or cord prepared to be connected to a tool with a suitable appliance coupler for power supply or other purposes. Flexible cord devices are covered by IEC309.
2.2.10 power supply cord powersupplycord, a flexible cable or cord fixed or mounted on a tool in one of the following ways for power supply: X-type connection typeXattachment
refers to such a connection method : Without the aid of special tools, a flexible cable or cord can be easily replaced by a flexible cable or cord that does not require any special preparation.
M-type connection typeMattachment
refers to a connection method: without the help of special tools, a flexible cable or cord can be easily connected by a sheath molded on the cord Or replace the crimped ends with specialized flexible cables or cords. Y-type connection typeYattachment
GB3883.1-91
refers to such a connection method that the flexible cable or cord can only be replaced with special tools usually available to the manufacturer and its agents. Y-type connection can be used for ordinary flexible cables or cords, or special flexible cables or cords. Z-type connection typeZattachment
refers to a connection method in which the flexible cable or cord cannot be replaced without part of the tool being damaged. 2.2.11 Basic insulation basic insulation is used to provide basic protection against electric shock to live parts. Basic insulation does not necessarily include insulation for functional purposes only. 2.2.12 Supplementary insulation supplementary insulation is an independent insulation provided in addition to the basic insulation in order to prevent electric shock when the basic insulation is damaged. 2.2.13 Double insulation doubleinsulation insulation consisting of basic insulation and supplementary insulation. 2.2.14 Reinforced insulation refers to a single insulation system used for live parts. It has a degree of protection against electric shock equivalent to double insulation under the conditions specified in this standard.
NOTE: The term "insulation system" does not mean that the insulation must be homogeneous monolithic. It may consist of several insulation layers which cannot be tested separately like supplementary insulation or basic insulation.
2.2.15 Hand-held toolHand-held tool (referred to as "tool" in this standard) is a machine driven by a motor or electromagnet for performing mechanical work. It is designed to be assembled with electric motor and mechanical parts, and can be easily carried to the work site and operated by hand or hanging. Note: Hand-held tools can be equipped with flexible shafts, and their motors are fixed or portable. Hand-held tools may also have a device for mounting on a stand.
Hand-held tools also include hand tools (such as road crushers). 2.2.16 Exchange type tool exchange type tool Tools that are not intended to be repaired at all or can only be repaired by the manufacturer's service organization. 2.2.17 "Class tool classItool | The protective (grounding) conductor of the fixed wiring in the equipment is connected so that accessible conductive parts cannot become live when the basic insulation is damaged. NOTE: For tools using flexible cables or cords, this measure includes a Protective conductor forming part of a cable or cord. Class I tools may have double or reinforced insulated parts, or parts operating at safety extra-low voltage. Class II tool
refers to such tools: Its protection against electric shock not only relies on basic insulation, but it also contains additional safety protection measures, such as double insulation or reinforced insulation, does not provide protective earthing or does not rely on equipment conditions. Such a tool can be one of the following types: a. Tools. A solid, substantially continuous shell of insulating material that covers all metal parts except for some small parts such as nameplates, screws, rivets, etc., which are separated from live parts by insulation at least equivalent to reinforced insulation ;Such tools are called insulating material-cased Class II tools,
b. Tools have a substantially continuous metal casing, except for those parts where reinforced insulation is used because double insulation is clearly impractical. All tools use double insulation. Such tools are called metal shell class III tools; tools that are a combination of ca and b.
2.2.19 Class III tools classⅢtool
refers to such a type of tool: it. The protection against electric shock relies on the safety extra-low voltage (SELV) power supply. The tool does not generate a voltage higher than the safety extra-low voltage.
With internal circuits operating at extra low voltage, such tools are not included in this classification GB3883.1-91
and should comply with some additional requirements; these requirements are under consideration in 2.2.20 extra low voltage extra. -lowvoltageThe voltage supplied by the power supply within the tool. When the tool is operated at rated voltage, the voltage between the lines and the voltage between the conductors and the ground does not exceed 42V, or, for a three-phase power supply, the voltage between the conductors and the neutral wire does not exceed 24V. , extra-low voltage circuits are isolated from other circuits only by basic insulation
2.2.21 Safety extra-low voltage safety extra-low voltage refers to not exceeding 42V between conductors and conductors to ground, or, for three-phase power. For example, the nominal voltage between the conductor and the neutral line does not exceed 24V, and its no-load voltage does not exceed 50V and 29V respectively. When the safety extra-low voltage is obtained from the power supply mains, it must be provided by a safety isolation transformer or with a separate separate winding. The voltage limits specified are based on the assumption that the safety isolating transformer is operating at its rated supply voltage. The value of the DC voltage is under study.
AC voltages with limits below 50V should be specified in IEC specific standards, especially when direct contact with live parts is involved.
The practice of isolating the mains with a protective resistor is excluded. 2.2.22 Safety isolating transformer safety isolating transformer refers to a transformer in which the input winding and output winding are electrically isolated by at least insulation equivalent to double insulation or reinforced insulation. It is specially designed to supply safety extra-low voltage for distribution circuits, tools or other equipment. And designed. 2.2.23 Normal load normalload
The load exerted on the tool, which causes the stress on the tool to be equivalent to the stress produced under normal use. Pay attention to any signs of short-term or intermittent operation, unless otherwise specified , heating elements, if present, should operate as in normal use. Note: Normal load is based on rated voltage or the upper limit of rated voltage range. 2.2.24 Rated operating time rated operating time refers to the operating time specified by the manufacturer for the tool. 2.2.25 Continuous operation refers to operation without time limit under normal load. 2.2.26 Short-time operation: within a specified period, start from the cold state and operate at normal load. The interval between two operating periods should be long enough to allow the tool to cool to close to room temperature.
2.2.27 Intermittent operation intermittent operation operates in a series of prescribed identical cycles. Each cycle consists of a normal load operation period and the remaining tool no-load or power outage period. 2.2.28 Non-detachable parts refer to parts that can only be disassembled with the help of tools. 2.2.29 Detachable parts refer to parts that can be disassembled without the aid of tools. 2.2.30 Thermal cut-out refers to a device that limits the temperature of a tool or its parts by automatically disconnecting the circuit or reducing the current when the tool is running abnormally. It should be constructed so that the user cannot change its set point. 2.2.31 Non-self-resetting thermal cut-out refers to a thermal circuit breaker that requires manual reset or replacement of parts before the circuit can be reconnected. 2.2.32 Creepage distance refers to the shortest path measured along the surface of the insulating material between two conductive parts or between the conductive part and the tool interface. 2.2.33 Electrical clearance clearance
GB3883.1-91
refers to the shortest distance measured through air between two conductive parts or between a conductive part and the tool interface. Note: The interface of the tool refers to the outer surface of the tool shell, which surface should be regarded as if it were a layer of metal box next to the accessible surface of the insulating material. 2.2.34 All-poledis connection means that in single-phase AC tools and DC tools, two power conductors are separated by one switching action, or, in tools connected to more than two power supply conductors, by one switching action. Disconnect all power supply conductors except the ground conductor. NOTE: The protective ground conductor is not the power supply conductor. 2.2.35 Accessible part or accessible surface refers to the part or surface that can be reached by the standard test finger shown in Figure 1. Accessible metal parts also include any other metal parts that are electrically connected to these parts.
2.2.36 Shell body
Including all accessible metal parts, handle bars, knobs, gripping parts and the like and metal foil affixed to the surface of all insulating materials; it does not include Touched metal parts. 3 General requirements
3.1 The design and structure of the tool should ensure that it is safe and reliable in normal use, so that even in the case of negligence that may occur during normal use, it will not cause danger to people or surrounding things. Under normal circumstances, , check compliance with the requirements by conducting all relevant tests. 4 General precautions for testing
4.1 The test according to this standard is a type test. 4.2 Unless otherwise specified, the test shall be carried out on a specimen in the as-supplied condition, and the specimen shall withstand all relevant tests. Note: If an individual test item is obviously unsuitable from the design of the tool, the test item will not be carried out. If the tools are designed with different power supply voltages, AC and DC, different rotational speeds, etc., more than one sample may be required. If the test of Article 11.6 is to be carried out, additional samples must be added. If a Class II tool needs to be disassembled for relevant tests, an additional sample needs to be added. When conducting component testing, it may be required to provide an additional sample for the component being tested. When additional component specimens are required, these specimens may be provided with the tool.
4.3 Unless otherwise specified, the test shall be carried out in the order of the provisions of Part One. If interference levels are measured in accordance with Chapter 13, these measurements shall be made immediately after the tests in Chapter 8. Note: Before starting the test, run the tool at the rated voltage or the lower limit of the rated voltage range to verify whether the tool is in normal working condition. 4.4 The tool or any movable part of it shall be tested in the most unfavorable position likely to occur in normal use. 4.5 If the test results are affected by the ambient air temperature, the room temperature is generally maintained at 20±5°C. However, when the temperature that can be achieved in any part of the room is limited by a heat-sensitive element or is affected by the temperature when the state of matter changes (such as the temperature of boiling water), the room temperature should be maintained at 23±2°C.
4.6. If the tools used only for AC are marked with a rated frequency, they can be tested with AC at the marked frequency; for tools used only with DC, they can be tested with DC; for tools used with both AC and DC, they can be tested with a less favorable power source. . AC tools that do not indicate a rated frequency or indicate a frequency range of 50 to 60 Hz can be tested at any frequency of 50 Hz or 60 Hz (but it must be the frequency specified by the country). For tools whose rated frequency range is not 50 to 60 Hz, the test is conducted at the most unfavorable frequency within the range. Tools designed for more than one rated voltage are tested at the most unfavorable voltage. Unless otherwise specified, tools designed for one or more rated voltage ranges are tested at the most unfavorable voltage within the range concerned. For tools marked with a rated voltage range, when the specified power supply voltage is equal to the rated voltage multiplied by a coefficient, the power supply voltage is equal to; the upper limit of the rated voltage range is multiplied by the coefficient, if the coefficient is greater than 1; the lower limit of the rated voltage range is multiplied by The coefficient if the coefficient is less than 1. GB3883.1-91
Note: The maximum rated input or minimum rated input mentioned refers to the rated input relative to the upper limit or lower limit of the rated voltage range respectively. When testing tools for DC only use, consider the possible effects of polarity on the operation of the tool. NOTE For tools designed for more than one rated voltage or rated voltage range, it may be necessary to carry out some tests with the minimum, average and maximum values ??of the rated voltage or rated voltage range in order to determine the most unfavorable voltage. 4.7 Tools with optional thermal elements or accessories may be tested in accordance with the relevant provisions of Part 2 and with those elements or accessories within the range of elements or accessories specified by the manufacturer that give the most unfavorable results. 4.8 In normal use, if a heating element will not operate unless the motor is running, the element shall be tested with the motor running; if the heating element will operate when the motor is not running, the element shall be tested with or without the motor running (select Whichever one is more unfavorable) is tested. Unless otherwise specified, heating elements installed in the tool shall be connected to a separate power source and tested in accordance with GB 4706.1.
4.9 Unless otherwise specified, tools equipped with adjusting devices or similar control devices, if the setting point can be changed by the user, shall be tested by adjusting these control devices to the most unfavorable setting point. Note: If the adjusting mechanism of the control device can be accessed without the help of tools, this article is applicable to changing the setting point by hand or with the help of tools; if the adjusting mechanism cannot be accessed without the help of tools, this article is only applicable to changing the setting point by hand. The set point can be changed. Proper encapsulation can be considered to prevent the user from changing the set point. 4.10 When normal load conditions are specified in Part 2, unless it is obvious from the design of the tool that these conditions will not occur during use, any short-term or intermittent operation markings on the tool shall be Load it under these conditions. When normal load conditions are not specified in Part 2, the tool shall be loaded according to the manufacturer's instructions; in the absence of such instructions, the tool shall be operated continuously with a load that obtains the rated input power. For accessories that perform a certain function in a certain chapter of Part 2, the test should be carried out in accordance with the provisions of that chapter. Other accessories shall be tested according to the manufacturer's instructions; in the absence of instructions, the tool shall be operated continuously with a load of rated input power. The electronic speed regulator is set at the highest speed position. NOTE: Trials with settings in other positions are under consideration. 4.11 If a torque load is applied, the method of applying the load must be selected to avoid additional stresses such as lateral thrust. However, the additional load required for the tool to operate correctly needs to be taken into account. 4.12 Tools used at safety extra-low voltage shall be tested together with the power transformer if the power transformer is usually sold together with the tool.
4.13 For the purposes of Chapters 8, 15, 23 and 25, parts separated from live parts by double insulation or reinforced insulation are considered not to become live in the event of insulation failure; they are accessible The connection of Jinzhan parts to earth terminals or earth contacts does not preclude the necessity of conducting these tests.
4.14 If a Class 1 tool has accessible conductive parts that are neither connected to a grounding terminal nor isolated from live parts by an intermediate metal part connected to the grounding terminal, such parts shall be in accordance with the requirements for Class III The corresponding requirements of the tool are used to check whether it meets the requirements. 4.15 Unless otherwise specified, if a Class 1 tool or Class II tool has parts that operate at safety extra-low voltage, such parts shall be tested for compliance with the corresponding requirements specified for Class II tools. 4.16 For tools with built-in electronic circuits, see Appendix B. 4.17 Routine testing is currently under consideration. 5 Rating
5.1 Maximum rated voltage:
—DC tools are 250V,
—other tools are 440V.
The preferred values ??for the rated voltage of Class II tools are 24V and 42V. Compliance is checked by inspecting the markings. GB3883.1-91
Note: The requirements of this standard are based on the assumption that the voltage of the power line to ground does not exceed 254V in normal use. 6 Classification
Tools are divided into:
6.1 According to the protection against electric shock:
Class I tools;
—Class II tools,
-IIII class tools.
6.2 According to the degree of moisture resistance:
Ordinary tools;
Splash-proof tools:
A watertight tool.
Note: The classification number does not reflect the safety level of the tool, but only indicates the method of obtaining safety. If Class I and III tools are sold with a separate safety isolation transformer for drawing power from the grid, their classification does not change. 7 Marks
7.1 Tools should have the following marks:
rated voltage or rated voltage range, V;
a symbol of the power supply type, depending on whether it is applicable; rated frequency or Rated rate range, Hz; except tools specifically designed for DC or universally designed for AC 50Hz and 60Hz;
Rated input power (if greater than 25W), W or kW; or rated current, A; || tt||Name, trademark or identification mark of the manufacturer: a model number of the manufacturer;
-rated operating time or rated operating time and rated downtime, h, min or s, as applicable; - Class I structural symbol, limited to Class I tools; moisture-proof degree symbol, subject to availability. Note: Tools with tail-to-delta connection should be clearly marked with two rated voltages (for example, 200△/380Y). The rated input power or current marked on the tool is the total maximum input power or current that appears on the circuit at the same time. If the tool has some replaceable components that can be selected by the control device, the rated input power refers to the power that may be applied. The input power at the highest negative wearing condition.
Additional flags are allowed if they do not cause misunderstanding. If the motor of a tool has a separate mark, the mark on the tool and the mark on the motor should not cause doubt between the rating of the tool itself and that of the manufacturer.
7.2 Unless the operating time is limited by the construction of the tool or the normal load as described in Part 2, tools that operate for short periods of time or intermittently must be marked with the rated operating time or separately marked with the rated operating time and rated rest. time. The signs of short-term operation or intermittent operation must be consistent with normal use. The sign of intermittent operation must be: the rated operating time is placed in front of the rated rest time, and the two are separated by a slash. 7.3 For tools with built-in heating elements, the complete mark required for heating elements in GB4706.1 must be added to the nameplate of the tool. 7.4 If the tool can be adjusted for different rated voltages or different input powers, the voltage or input power to which it is adjusted must be clear and easily identifiable.
This requirement does not apply to tools with star
delta connections.
Note: For tools that do not require frequent changes in the voltage setting point, the rated voltage or rated input power regulated by the tool can be determined from the circuit diagram GB3883.1-91
fixed on the tool. This requirement may be deemed to have been met. This drawing may be placed on the inside of a cover that is to be removed when connecting the power cord. The drawing may be drawn on cardboard riveted to the cover, or on a paper or similar label affixed to the cover with adhesive. But it should never be placed on a label that is loosely attached to the tool.
7.5 Tools marked with more than one rated voltage or rated voltage range, if their rated input power is greater than 25W, must be marked with the rated input power corresponding to each voltage or voltage range. The upper and lower limits of the rated input power must be marked on the tool to clearly show the relationship between the input power and voltage, but this does not need to be so marked when the difference between the upper and lower limits of the rated voltage range does not exceed 10% of the average value of the range. In this case, the rated input power may be quoted relative to the mean of the range.
7.6When symbols are used, they should look like this: V
A
Hz·
W
kw
pF
kg
N/cm
Pawww.bzxz.net
h
min
3N
no
back
A (One dropping point in the triangle)
(Two dropping points)
/min.
The power supply type symbol must be immediately behind the rated voltage mark. volts
amps
hertz
watts
kilowatts
microfarads
liters
kilograms
Newtons /cm2
pascal
hour
many
second
AC
Three-phase AC
Three-phase with neutral line Phase AC
DC
no-load speed
Class III structure
... splash-proof structure
watertight structure
revolutions per minute or Number of reciprocations
The size of the Class I structural symbol should be: the side length of the square outer frame is approximately 2 times the side length of the square inner frame. The side length of the square outer frame shall not be less than 5 mm, unless the maximum size of the tool does not exceed 15cm, in this case, the size of this symbol can be reduced, but the side length of the square frame shall not be less than 3mm.
The position and placement of the Class II structural symbol should clearly indicate that it is part of the technical description and will not cause confusion with any other symbol.
Note: The revision of the symbol for the type of anti-protection structure is under consideration. 7.7 The dedicated terminal block for the neutral line must be marked with the letter N. The ground terminal must be marked with the symbol one.
These markings may not be placed on screws, removable washers, or other parts that may be removed when connecting conductors. 7.8 Unless the correct method of connection is obvious, any tool intended to be connected to more than two power cords shall have a connection diagram fixed to the tool.
GB 3883.1-91
Note: If the terminal block for connecting the power cord is marked with an arrow pointing to the terminal block, the correct connection method is considered to be obvious and easy to understand. The ground wire is not the power wire. For tools with star-delta connection, the circuit diagram should indicate the winding connection method. This connection diagram can be the line diagram mentioned in 7.4. 7.9 Unless clearly necessary, switches must be marked or placed to clearly indicate the part of the tool they control. Signs used for this purpose, no matter where they are used, should be able to be understood by people without resorting to knowledge of words, national standards, etc.
7.10 If the button is only used to disconnect the controlled circuit and has no other functions, the button should be colored red. Note: This requirement does not apply to the button used to lock the power switch. For tools that may cause danger when accidentally started, the off position of the power switch must be marked, unless this position is obvious; if this mark is required, it should be represented by the number 0. The number 0 should not be used as any other flag.
The position of the moving contact of the power switch must be consistent with the marks on the different positions of its operating mechanism. 7.11 Adjustment devices and similar devices that need to be adjusted during operation should have directional signs to indicate the increase or decrease of the adjusted characteristic value. Note: Marks made with "ten\" and "one" are considered to meet the requirements. If numbers are used to mark different positions, the "off" position must be represented by 0; while larger output, input, speed, etc. The position must be marked with a higher number.
Note: The first requirement does not apply to an adjustment mechanism with an adjustment device whose "full" and "off" positions are marked exactly opposite each other. The marks on the different positions of the operating parts of the control mechanism are not necessarily placed on the mechanism itself. 7.12 Tools equipped with electronic adjustment devices must have special marks or instructions, and the instructions should provide necessary instructions for the use of the tools. Written in the official language of the country to which the product is sold. Where symbols are used, those specified in this standard must be used. Compliance with the requirements of 7.1 to 7.13 must be checked by observation. The mark must be easily legible and durable. . The markings specified in Articles 7.1 to 7.12 shall be placed on the main part of the tool in such a way that the markings are clearly visible when the tool is ready for use.
Note: For ordinary tools, temporary use is allowed. Place self-adhesive labels in recesses of the tool housing. Markings and markings on switches, thermostats, thermal breakers, and other control devices should be placed near these components; these markings and markings should not be placed on removable parts. Otherwise, these parts will cause misinterpretation of the mark when reinstalled. Check whether it meets the requirements by observing and wiping the mark with a wet cloth soaked in water for 15 seconds, and then using a cloth soaked in gasoline to wipe the mark for 15 seconds. .
After all tests of this standard, the sign shall be legible; the sign shall not be easily removed and shall not exhibit curling. Note: Revision of the test to check the durability of the sign and for adhesion. Compliance labeling requirements are under consideration. 8 Electric shock protection
8.1 For Class I tools, the construction and housing of the tool shall be adequate to prevent accidental contact with live parts. The insulating properties of paint, enamel, plain paper, cotton, oxide films on metal parts, glass powder and sealants shall not be relied upon to provide protection against accidental contact. Required protection of live parts.
There shall be no openings in the tool casing that provide access to live parts other than those necessary for the use and work of the tool; for Class II tools, there shall also be no openings accessible to the live parts. Openings of parts separated only by basic insulation from live parts. Unless otherwise specified, parts operating at a safety extra-low voltage not exceeding 24V may not be treated as live parts by observation and using the standards shown in Figure 1. Test probes are used to check compliance with the requirements of this article. In addition, the test probe shown in Figure 2 is to be used to test the apertures of Class II tools and the metal parts of Class I tools except those on the metal parts connected to the ground terminal or ground contact. The pores outside the pores are tested.9 Unless clearly unnecessary, switches must be marked or placed to clearly indicate the part of the tool they control. Signs used for this purpose, no matter where they are used, should be able to be understood by people without resorting to knowledge of words, national standards, etc.
7.10 If the button is only used to disconnect the controlled circuit and has no other functions, the button should be colored red. Note: This requirement does not apply to the button used to lock the power switch. For tools that may cause danger when accidentally started, the off position of the power switch must be marked, unless this position is obvious; if this mark is required, it should be represented by the number 0. The number 0 should not be used as any other flag.
The position of the moving contact of the power switch must be consistent with the marks on the different positions of its operating mechanism. 7.11 Adjustment devices and similar devices that need to be adjusted during operation should have directional signs to indicate the increase or decrease of the adjusted characteristic value. Note: Marks made with "ten\" and "one" are considered to meet the requirements. If numbers are used to mark different positions, the "off" position must be represented by 0; while larger output, input, speed, etc. The position must be marked with a higher number.
Note: The first requirement does not apply to an adjustment mechanism with an adjustment device whose "full" and "off" positions are marked exactly opposite each other. The marks on the different positions of the operating parts of the control mechanism are not necessarily placed on the mechanism itself. 7.12 Tools equipped with electronic adjustment devices must have special marks or instructions, and the instructions should provide necessary instructions for the use of the tools. Written in the official language of the country to which the product is sold. Where symbols are used, those specified in this standard must be used. Compliance with the requirements of 7.1 to 7.13 must be checked by observation. The mark must be easily legible and durable. . The markings specified in Articles 7.1 to 7.12 shall be placed on the main part of the tool in such a way that the markings are clearly visible when the tool is ready for use.
Note: For ordinary tools, temporary use is allowed. Place self-adhesive labels in recesses of the tool housing. Markings and markings on switches, thermostats, thermal breakers, and other control devices should be placed near these components; these markings and markings should not be placed on removable parts. Otherwise, these parts will cause misinterpretation of the mark when reinstalled. Check whether it meets the requirements by observing and wiping the mark with a wet cloth soaked in water for 15 seconds, and then using a cloth soaked in gasoline to wipe the mark for 15 seconds. .
After all tests of this standard, the sign shall be legible; the sign shall not be easily removed and shall not exhibit curling. Note: Revision of the test to check the durability of the sign and for adhesion. Compliance labeling requirements are under consideration. 8 Electric shock protection
8.1 For Class I tools, the construction and housing of the tool shall be adequate to prevent accidental contact with live parts. The insulating properties of paint, enamel, plain paper, cotton, oxide films on metal parts, glass powder and sealants shall not be relied upon to provide protection against accidental contact. Required protection of live parts.
There shall be no openings in the tool casing that provide access to live parts other than those necessary for the use and work of the tool; for Class II tools, there shall also be no openings accessible to the live parts. Openings of parts separated only by basic insulation from live parts. Unless otherwise specified, parts operating at a safety extra-low voltage not exceeding 24V may not be treated as live parts by observation and using the standards shown in Figure 1. Test probes are used to check compliance with the requirements of this article. In addition, the test probe shown in Figure 2 is to be used to test the apertures of Class II tools and the metal parts of Class I tools except those on the metal parts connected to the ground terminal or ground contact. The pores outside the pores are tested.9 Unless clearly unnecessary, switches must be marked or placed to clearly indicate the part of the tool they control. Signs used for this purpose, no matter where they are used, should be able to be understood by people without resorting to knowledge of words, national standards, etc.
7.10 If the button is only used to disconnect the controlled circuit and has no other functions, the button should be colored red. Note: This requirement does not apply to the button used to lock the power switch. For tools that may cause danger when accidentally started, the off position of the power switch must be marked, unless this position is obvious; if this mark is required, it should be represented by the number 0. The number 0 should not be used as any other flag.
The position of the moving contact of the power switch must be consistent with the marks on the different positions of its operating mechanism. 7.11 Adjustment devices and similar devices that need to be adjusted during operation should have directional signs to indicate the increase or decrease of the adjusted characteristic value. Note: Marks made with "ten\" and "one" are considered to meet the requirements. If numbers are used to mark different positions, the "off" position must be represented by 0; while larger output, input, speed, etc. The position must be marked with a higher number.
Note: The first requirement does not apply to an adjustment mechanism with an adjustment device whose "full" and "off" positions are marked exactly opposite each other. The marks on the different positions of the operating parts of the control mechanism are not necessarily placed on the mechanism itself. 7.12 Tools equipped with electronic adjustment devices must have special marks or instructions, and the instructions should provide necessary instructions for the use of the tools. Written in the official language of the country to which the product is sold. Where symbols are used, those specified in this standard must be used. Compliance with the requirements of 7.1 to 7.13 must be checked by observation. The mark must be easily legible and durable. . The markings specified in Articles 7.1 to 7.12 shall be placed on the main part of the tool in such a way that the markings are clearly visible when the tool is ready for use.
Note: For ordinary tools, temporary use is allowed. Place self-adhesive labels in recesses of the tool housing. Markings and markings on switches, thermostats, thermal breakers, and other control devices should be placed near these components; these markings and markings should not be placed on removable parts. Otherwise, these parts will cause misinterpretation of the mark when reinstalled. Check whether it meets the requirements by observing and wiping the mark with a wet cloth soaked in water for 15 seconds, and then using a cloth soaked in gasoline to wipe the mark for 15 seconds. .
After all tests of this standard, the sign shall be legible; the sign shall not be easily removed and shall not exhibit curling. Note: Revision of the test to check the durability of the sign and for adhesion. Compliance labeling requirements are under consideration. 8 Electric shock protection
8.1 For Class I tools, the construction and housing of the tool shall be adequate to prevent accidental contact with live parts. The insulating properties of paint, enamel, plain paper, cotton, oxide films on metal parts, glass powder and sealants shall not be relied upon to provide protection against accidental contact. Required protection of live parts.
There shall be no openings in the tool casing that provide access to live parts other than those necessary for the use and work of the tool; for Class II tools, there shall also be no openings accessible to the live parts. Openings of parts separated only by basic insulation from live parts. Unless otherwise specified, parts operating at a safety extra-low voltage not exceeding 24V may not be treated as live parts by observation and using the standards shown in Figure 1. Test probes are used to check compliance with the requirements of this article. In addition, the test probe shown in Figure 2 is to be used to test the apertures of Class II tools and the metal parts of Class I tools except those on the metal parts connected to the ground terminal or ground contact. The pores outside the pores are tested.
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