GB 4793.6-2001 Safety of electrical equipment for measurement, control and laboratory use Particular requirements for laboratory material heating equipment
Some standard content:
GB 4793. 6--2001
All technical contents of this standard are mandatory. Foreword
This standard is formulated based on IEC61010-2-010 Particular requirements for laboratory material heating equipment and Amendment No. 1 (1996) formulated by the 66th Technical Committee of the International Electrotechnical Commission IEC. This standard adopts IEC 61010-2-010:1992 and Amendment No. 1. This standard should be used in conjunction with IEC 61010-1. GB 4793.1-1995 has adopted the 1990 edition of IEC61010-1 and the first amendment in 1991, but has not adopted the second amendment in 1995. To ensure the coordination and consistency between the standards, this standard is used in conjunction with IEC 61010-1. The content of IEC 61010-1 can refer to GB4793.1-1995.
The safety standard for electrical equipment for measurement, control and laboratory use consists of two parts. Part 1 is the general requirements, and Part 2 is the special safety requirements for each product.
The part of this standard marked with "applicable" indicates that the corresponding provisions in IEC 61010-1 are applicable to this standard; the part of this standard marked with "replace" or "modify" is subject to the provisions in this standard; the part of this standard marked with "addition" indicates that in addition to complying with the corresponding provisions of IEC61010-1, it must also comply with the provisions added in this standard. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the Mechanical Industry Instrument and Meter Comprehensive Technical and Economic Research Institute. The drafting unit of this standard: Mechanical Industry Instrument and Meter Comprehensive Technical and Economic Research Institute. The main drafter of this standard is Li Lin.
GB 4793.6-2001
IEC Foreword
1) The formal resolutions or agreements of the IEC on technical issues formulated by the technical committees in which all national committees with special concerns participate express the international consensus on the issues involved as closely as possible. 2) These resolutions or agreements are recommended for international use and are accepted by the national committees in this sense. 3) In order to promote international unification, the IEC hopes that all national committees will adopt the contents of the IEC standards as the provisions of their national committees to the extent permitted by their domestic conditions. Any differences between the standards recommended by the IEC and the corresponding national standards should be clearly stated in the national standards as much as possible. Note.
This standard was prepared by Technical Committee IEC/TC66 (Safety of electrical equipment for measurement, control and laboratory use). This standard has the status of a safety publication in accordance with IEC Guide 104. The text of this standard is based on the following documents: DIS
66E(CO)10
Voting Report
66E(CO)16
Full information on the voting to approve this standard can be found in the voting report shown in the table above. This standard is used in conjunction with IEC61010-1. IEC61010-1 consists of the first edition of 1990, the first amendment of 1991 and the second amendment of 1995. IEC Future versions or revisions of IEC 61010-1 are under study. This standard supplements or modifies the corresponding clauses of IEC 61010-1 in order to become an IEC standard: Particular requirements for laboratory equipment for heating of materials.
Some clauses of IEC 61010-1 are not restated in this standard, but this standard still applies. Where there is "supplement", "modification" or "replacement" in this standard, the relevant requirements, test requirements or notes in IFC 61010-1 shall also apply. The following typographical fonts are used in this standard:
Requirements: Roman:
- Note: Small Roman;
- Test specifications: Italic:
- Terms defined in Chapter 3 for use in this standard: Small Roman, National Standard of the People's Republic of China
Safety of electrical equipment formeasuretbent ,control and laboratory useParticular requirements Por laboratory equipment forthe heating of materials materials
1 Scope and purpose
Except as follows, this chapter of IEC61010-1 is applicable.1.1 This clause is replaced by the following:
GB 4793. 62001
idt IEC 61010-2-010:1992
This standard applies only to electrically-driven laboratory equipment for heating materials, where heating of materials is the only function or one of several functions of the equipment. 1. 1.2 This clause adds the following:
Laboratory heating and ventilation equipment,
—Disinfection equipment;
—Heating equipment into which an operator can enter, i.e. equipment in which the space is sufficient to accommodate an operator when the door of the equipment is closed. 2 Referenced standards
This chapter of IEC61010-1 is applicable.
3 Definitions
This clause of IEC 61010-1 applies except as follows: This clause adds the following:
3.7. 101 Pollution degree 3 Conductive pollution or non-conductive pollution resulting from conductive pollution, which is expected to be caused by condensation. 4 Tests
This clause of IEC 61010-1 applies except as follows: 4.3.2 This clause adds the following:
Note: In case of uncertainty, the test shall be carried out under more than one combination of conditions. 4.3.14 This clause is replaced by the following:
Under normal use conditions, the equipment loaded with the specified material shall be loaded with the minimum appropriate amount of material, including no load, under normal use as allowed by the operating instructions. In case of doubt, the test shall be carried out under more than one load condition. 4.4.2.10 Add the following content to this clause:
Under normal use conditions, if filling with an excess or insufficient amount of the specified heat transfer medium can cause a hazard (see 1.2), then an overload or no-load test, or a combination of these two conditions, shall be carried out as appropriate (see 9.5 and 11.4). Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on November 2, 2001 and implemented on June 1, 2002
4.4.4.2 Replace the second paragraph with the following content: GB 4793. 6-2001
Except for the surface heating of heating equipment (see Chapter 9), whether the equipment is heated by heat transfer or by proximity to a heating element, the temperature of the equipment surface or parts shall not exceed 105°C at an ambient temperature of 40°C (see 1.4). 5 Marking and Documentation
Except for the following, this chapter of IEC61010-1 is applicable:5.1.2 This clause adds the following:
The degree of protection, if required, shall be in accordance with IEC60529 (see 11.6).5.1.3 This clause adds the following:
The following note is added to clause c):
Note: If the actual power and current are likely to be much greater than the indicated maximum rated power and current for 1 mun or less after switching on, the instantaneous maximum value shall be marked after the maximum rated function or current on the bracket. 5.1.6 This clause adds the following:
Clause f) adds the following:
For drying cabinets and similar equipment, each side of the equipment with doors shall have an indication of the "open" state. 5.2.101 Equipment with high allowable current
For equipment that is not permanently connected to water, if the allowable current of the equipment exceeds the limits of 6.3.1.2 or 6.3.2.2, but is within the limits for permanently connected equipment, then the power supply shall be marked with a warning of non-permanent connection. The mark shall be on the surface or next to the exhaust valve connected to the power supply, and the temporary warning shall also be repeated in the installation instructions. In Table 1 of IEC61010-1 Symbol 14 is a suitable warning sign, but in view of the fact that the symbol may not be understood in different countries where the equipment is used, the warning sign should be printed in the appropriate language. Compliance is checked by visual inspection.
5.4.3 This clause is amended by the following:
Add after the first dash:
Warning that the equipment must not be mounted on surfaces of flammable materials if hot parts falling from the equipment could cause a hazard, for example, when a door is open.
Replace the third dash with the following: Switching on the power supply. When the power supply is permanently switched on, the required warnings and statements are necessary (see 5.2.101).For the accessible mist parts of the equipment that endanger people (see 6, 1.1012, it should be stated that a residual current circuit breaker needs to be installed, and the following should be added after the last comma:
—Any drying equipment (see 5.4.3.101) If the heated material can produce dangerous gases, the installation instructions should have necessary instructions for the exhaust system, and add the temperature range of the device related to the safe temperature of the material (see the corresponding clauses in 5.4.1). This clause adds the following content:
5.4.3.101 Drying
If the equipment may not meet all the safety requirements of this standard after transportation or storage under humidity conditions, the installation instructions should specify the operating cycle of the drying equipment to restore to normal conditions. The instructions should include this warning that the equipment cannot be assumed to have met all the safety requirements of this standard during the drying process.
Note: There are also requirements for drying before the test in 6.8. These tests need to be carried out at both ambient temperature and operating temperature. It is conducive to the completion of the drying process and to carry out 6.3 and 6. The test is restarted and repeated at the operating temperature. The qualification is checked by daily test method.
5.4.4 This clause adds the following content:
When the accessible parts (see 6.1.101) may cause personal injury, special protective devices shall be added for the operators; GB 4793. 6--2001
- Warnings regarding any possible danger of explosion, implosion, release of toxic or flammable gases, etc. caused by heating of the material (see 1.1);- Specification of suitable heat transfer media, such as liquids for heating tanks. 5.4.4.101 Cleaning and Decontamination
The documentation should state:
- If a hazardous material is released from or into the equipment, it is the user's responsibility to carry out appropriate decontamination. The manufacturer should give advice on the necessary cleaning locations, decontamination procedures, and the types of materials to be used for cleaning and decontamination.
The following should be stated in the documentation:
"Users who use cleaning and decontamination methods not recommended by the manufacturer should check with the manufacturer's methods to ensure that such methods will not damage the equipment."
If the manufacturer states that an item can be decontaminated by steam sterilization, the item should be able to withstand steam sterilization for at least one of the time-temperatures given in Table 1A.
1 The manufacturer should refer to the internationally recognized "Laboratory Biosafety Manual", which was published in 1994. Published by the World Health Organization in Geneva in 2000, the manual includes information on decontamination use, dilution, characteristics and possible applications. It can also be used in accordance with relevant domestic standards. 2 When laboratory heating equipment and its accessories are maintained, repaired or replaced, cleaning and decontamination are necessary protective measures. The manufacturer should also prove to the user that the above process has been carried out.
Table 1A Time-temperature conditions
Absolute pressure
Rated temperature
Corresponding steam temperature
Previous. "Minimum holding time\ refers to the time when the contaminant is at the steam temperature. Compliance is checked by visual inspection.
5.4.5 The following content is added to this clause:
134—138
126—129
121 -124
115--118
Minimum holding time
If the main power cord uses a high-temperature or other special cable, the instructions should indicate that it can only be replaced with an equivalent cable. The instructions shall specify how the responsible person shall check the effective operation of the overheating or liquid level protection devices necessary for safety and state the intervals at which the checks are to be carried out (see 9.5).
6 Protection against electric shock
This clause of IEC 61010-1 applies except as follows. 6.1 The following should be added:
6.1.101 Exceptions for laboratory heating equipment If the drying oven or heating furnace is operated correctly, hazardous live parts may be touched, which is not allowed otherwise. Such parts include: - parts that require continuous contact (such as the transfer section of the drying oven and the furnace of the heating furnace); - holes for observation or insertion of sensors and probes; - the operating temperature must be kept constant to prevent the material being processed from being subjected to thermal shock, so that the energy of the heating parts that are touched when the furnace door is opened remains unchanged.
In the above case, if the following conditions can be met, it is allowed to access the internal dangerous parts: - The dangerous live parts are powered by a circuit protector through a residual current control interrupter, which will cut off the power supply when the variable current is 30mA or less, or it is specified in the installation instructions that the equipment must be connected to a power supply equipped with a similar circuit breaker,
GB 4793. 6-2001
- Warning signs remind potential dangers, and indicator lights are installed at dangerous locations: - Conductive transmission belts, furnace jackets, etc. must be connected to the protective conductor terminal; - The instructions for use should indicate that operators must prevent electric shock, including parts that may be dangerous to the human body and the protective conductor terminals connected to the parts, and explain how to achieve the above requirements. One or more of the following methods can be adopted, such as insulating tools, insulating clothing, standing on an insulating floor, shielding plates of parts connected to the protective conductor terminals, etc., so that operators can access parts under normal use conditions.
Qualification is checked by daily test method.
6.2 Add the following to this clause:
Add the following note after the first paragraph:
Note: If the test fingers or probes that contact the material are provided with suitable insulation protection (see the note in 6.4), they must not contact any metallic parts. 6.3 Add the following to this clause:
If the installation instructions specify a drying process (see 5.4.3.101), this process is carried out before the measurements in 6.3. Immediately after drying, a 2 h recovery period is entered during which the equipment is disconnected from the power supply and continues until the test is carried out. The equipment is measured at room temperature. If it is suspected that the permissible limit may be exceeded at the maximum operating temperature, the relevant measurements shall be carried out at the maximum temperature and the higher temperature used.
6.3.1.2 Add the following to this clause:
Add the following after the first dash: The current values for permanently connected equipment are 1.5 times these values. 6.3.2.2 Add the following to this clause:
Add the following after the first decompression mark: The current values for permanently connected equipment are 1.5 times these values. 6.4 Add the following to this clause:
Add the following after the note:
Although ceramics provide satisfactory electrical insulation at room temperature, their insulating properties are reduced at elevated temperatures, not only because they are sensitive to mechanical damage, but also because at elevated temperatures they become conductive and can be contaminated by conductive materials under normal conditions of use. 6.8.2 Add the following to this clause:
For the drying process of the equipment, see 5.4.3.101.) The pre-wet treatment does not apply. 6-8.3 Amend the clause with the following:
Replace the second sentence of the first paragraph with the following. If the installation instructions specify a drying process (see 5.4.3.101), this process shall be completed before the test in 6.8.4. After drying, a 2 h recovery period shall be immediately entered with the equipment disconnected from the power supply, and the test shall be completed within 1 h of the recovery period. The equipment is not operated during the test. If there is any doubt as to whether the equipment will pass a particular test at the highest operating temperature, the test shall be repeated at the highest operating temperature.
6.10.1 Add the following to this clause:
Add a dash after the first dash: - If the wire may contact hot parts of the equipment, it shall be made of suitable heat-resistant material (see 5.4.5) and shall not be detachable unless the equipment is provided with an input rating device for use at the highest temperature to which it will be exposed. In the latter case, the corresponding power connector shall have the same high temperature rating and be installed with wires of suitable heat-resistant material. 7 Protection against mechanical hazards
This clause of IEC61010-1 applies.
8 Resistance to mechanical shock and impact
This clause of IEC61010-1 applies.
9 Temperature limits of equipment and protection against fire GB 4793. 6—2001
Except for the following, this chapter of IEC61010-1 is applicable. This clause is amended with the following content:
9.1 Replace the first line of the second paragraph with the following content: If a surface that is easily accessible is required for functional reasons, whether it is heated by heat transfer or by proximity to hot parts, it is allowed to 9.5 This clause is replaced with the following content,
9.5 Overtemperature protection
If a single fault condition occurs in a temperature control system, heater, cooling device, agitator or other component which could cause a hazard through overheating of a component of the equipment or the material being processed, a non-automatic reset overtemperature protection device or system shall disconnect the power supply to the heating device and other components that could cause the hazard. If an insufficient amount of heat transfer fluid could cause a hazard, an automatic or non-automatic level protection device shall disconnect the power supply to the heating device or other components that could cause the hazard.
The whole of the equipment or related parts shall be disconnected from the power supply by one of the following methods: - For single-phase equipment, by a simple electrode device or system; for parts controlled by the temperature control system overtemperature protection device, disconnect the power supply to the opposite conductor of the temperature control system; - For multi-phase equipment, by a simple device or system to disconnect all phases, or by a separate device or system for each phase
A device or system may disconnect all electrodes from the power supply. 1 If a single fault condition specified in the safety standard occurs, a single-pole overtemperature protection device will be activated. Over-temperature protection devices which disconnect the relevant parts from the supply pole have the advantage of providing protection in certain situations where the failure of a component (e.g. a grounded part of an isolated supply) may increase the possibility of a hazard (see 1.2) resulting from failure of the temperature control system, without impairing its operation and safety. 2 In equipment designed for heating materials, hazards (see 1.2) may be caused by overheating of the material being processed or overheating of the heat transfer medium (mainly in the heating tip), as well as by overheating of the parts of the equipment itself. Therefore, it may be necessary to install a high level of safety system to prevent a single failure condition of the equipment.
3 In certain situations, a drop in the temperature of the heating medium (e.g. a mold in the tip or gas in the furnace) may cause a hazard (see 1.2). If one temperature control system fails, resulting in the operation of an over-temperature protection device, a second temperature control system may be activated to maintain a safe temperature unless the over-temperature protection device is activated. For equipment used to contain flammable materials and also used to operate or conduct heat, the overtemperature protective device or system shall ensure that, when installed directly in accordance with the manufacturer's instructions, the fluid does not exceed the temperature specified in Table 3 of 9.2 for normal use or single fault conditions. NOTE Normal use (meaning use in accordance with the manufacturer's instructions) includes the correct installation of each adjustable overtemperature protective device. Faulty installation of the device due to the use of own tools may cause a single fault condition, so each single fault condition of the overtemperature protective device or system shall be tested in accordance with the manufacturer's instructions.
Safety overtemperature protective devices shall be completely separated from each temperature control system. This requirement applies not only to the temperature sensor, but also to all control contacts and circuits. Whether the control is by temperature, pressure, level, air flow or other means, the requirements of 14.3 shall be met. Adjustable overtemperature and level devices shall only be adjusted with the aid of tools. Compliance is checked by visual inspection and by the fault tests of 4.4.2.9 and 4.4.2.10. 10 Heat resistance
This chapter of IEC.61010-1 is applicable.
11 Protection against hazards of fluids
1This chapter of IEC61010-1 is applicable.
12 Protection against radiation (including laser sources), sound pressure and ultrasonic pressureThis chapter of IEC61010-1 is applicable.
13 Protection against gas release, explosion and implosion
GB 4793.6—2001
Except for the following contents, this chapter of IEC61010-1 is applicable. 13.2.1 This clause is amended by the following:
13.2.1 Components and heated materials
Replace the first paragraph with the following:
If components are liable to explode when overheated or overloaded and no pressure relief device is provided, or if the equipment is designed to handle materials that may explode or implode, the apparatus shall be equipped with protective means for the operator (see 7.5). 13.3 This clause is added with the following:
13.3.101 Implosion of vacuum furnaces
Vacuum furnaces shall be equipped with protective means to protect the operator and the environment from the effects of implosion. Compliance shall be checked by visual inspection of the equipment and design data and, in case of doubt, by inducing an implosion. 14 Components
This clause of IEC61010-1 applies except as follows. 14.3 This clause is replaced by the following: Overtemperature protection devices that are activated under single fault conditions shall be assembled and tested to ensure reliable function, and the maximum voltage and current used to interrupt the circuit shall be specified! The temperature of specified parts and materials shall be limited, and the device shall not exceed the relevant temperature range of Table 3. See also 4.4.4.2. If practicable, the operator shall be provided with a function to check the function of the device or system under single fault conditions. The instructions for use shall detail the usual inspection methods and inspection intervals.
Note: For adjustable devices or systems, the inspection is usually carried out when the over-temperature protection device is installed to achieve a temperature lower than that of the temperature control system. For non-removable covers or systems, they cannot be used as filter level protection. They must be automatically reset when the temperature of the temperature control system is temporarily exceeded. The liquid level device used to achieve over-temperature protection will follow the same requirements as the over-temperature protection device or system. Compliance is checked by understanding the working principle of the device and by conducting sufficient reliable tests on the performance of the equipment under single fault conditions (see 4.4). The number of operations is as follows:
--Operate once for non-resetting devices;
---Operate 10 times for non-automatic resetting devices, except fuses, and reset after each operation; operate 200 times for automatic resetting devices. Note: To prevent equipment damage, forced cooling and intermittent operation methods are adopted. During the test, the reset device shall operate when each single fault condition occurs, and the non-resetting device shall only operate once. After the test, the reset device will not display a danger signal in the case of multiple single faults. 15 Interlock protection
This chapter of IEC610101 is applicable.
GB 4793. 6-2001
Except for the following contents, the appendix contents of IEC 61010-1 are applicable. Appendix D
(Standard Appendix)
The electrical clearances, creepage distances and test voltage specifications in equipment and on printed circuit boards are applicable to the following contents in Appendix D of IEC61010-1. D2.1 This clause adds the following contents:
Add the following Note 1:
If the heated materials are stored at gradually decreasing distances, it is recommended to increase the electrical clearances and creepage distances. For the specified values of basic insulation or supplementary insulation corresponding to pollution level 3, see Table D101, Table D102 and Table D103, for double insulation or reinforced insulation, see Table D104, Table D105 and Table D106, for creepage distances, if D2 is not met (see D8), see Table D107.
Add new tables D101 to D107:
D5.2 Calculation of basic insulation or supplementary insulation clearances when non-uniform hook structure is usedReplace the last sentence of the last paragraph with the following new content:
If the creepage distance is lower than the minimum value, increase it to the minimum value. For pollution level 1, the minimum creepage distance is 0.1mm, for pollution level 2, the minimum creepage distance is 0.2m (see IEC60664 Table 1) For pollution level 3, the minimum creepage distance is 0.8mm (see Tables D101 to D106). Table D101 Basic insulation or supplementary insulation
Pollution level 3
Working voltage
(effective value
or DC)
Electrical clearance
IRC2600
Equipment category (overvoltage category) 1
Creep distance
Material group
IRC400
To: Working voltage greater than 630V, material group, CTI≥175 required. (See note)
IRC100
Type impulse peak
1.2/50μs
Test voltage
effective value
50/60 Hz
DC or
50/60Hz
Bee value lmin
Working voltage
(effective value
or DC)
Electrical room
IRC600
GB4793.6—2001
Table D102
Basic insulation or supplementary insulation
Pollution level 3
Equipment category (overvoltage category)
Fertilizer distance
Material groupbZxz.net
IRC2400
Note: Working voltage is greater than 630 V, material group, and CTI≥175 is required.I
(See Note)
IRC2100
Impact Peak
1.2/50μs
Basic Insulation or Supplementary Insulation
Table D103
Pollution Level 3
Working Voltage
(RMS
or DC]
Electrical Clearance
IRC600
Cabinet Distance
Equipment Class (Overvoltage Category)
Material Group
IRC≥400
Note: Working voltage is greater than 630 V, material group E, CTI≥1751 is required
(See Note)
IRC2100
Impact Peak
1.2/50 μs
Test voltage
effective value
50/60Hz
Test voltage
effective value
50/60Hz
, 490
DC or
50/60Hz
Peak value 1mn
DC or
50/60Hs
Bee value 1 mun
Working voltage
(effective value
or DC)
Electrical clearance
IRC2600
GB 4793. 6—2001
Table D104 Double insulation or strong insulation
Pollution level 3
Equipment category (overvoltage category) I
Creep distance
Material group
(See note)
IRC2400
Note: Working voltage is greater than 630V, material group I, CTI≥175 is required. IRC2100
Impact bee value
1.2/50μs
Table D105 Double insulation or reinforced insulation
Pollution level 3
Equipment category (overvoltage category) 1
Working voltage
(effective value
or DC)
Electrical clearance
IRC2600
Creepage distance high
Material group
(see note)
IRC2400
Note: Working voltage is greater than 630 V, material group【, CTI≥175.IRC100
Strike peak
1.2/50μs
Test voltage
effective value
50/60 Ha
Test voltage
effective value
50/60Hz
DC or
50/60Hz
DC or
50/60Hz
Working voltage
(effective value
or DC)
Electrical clearance
IRC600
GB4793.6—2001
Double insulation or reinforced insulation
Table D106
Pollution level 3
Equipment category (overvoltage category) Mutual
High voltage
Material group
TRC2400
Note, working voltage is greater than 630 V, material group I, requires CTI = 175. (see note)
TRC2100
Creep distance
Table D107
Impact peak value
Creep distance
Working voltage
(RMS or DC)
IRC600
Pollution degree 3
IRC≥400
Test voltage
RMS
50/60H2
DC or
50/60Hz
【a/1b(see note)
IRC≥600
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