This standard specifies the safety requirements for the maintenance and operation of audio-visual, video and television equipment and systems. This standard applies to the safe maintenance and operation of audio-visual, video and television equipment and systems. Its purpose is to enable those who come into contact with or operate audio-visual equipment to follow the instructions in educational or training situations and take appropriate protective measures to ensure safety. GB 12641-1990 Safety requirements for the maintenance and operation of audio-visual, video and television equipment and systems GB12641-1990 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB12641—1990
Audiovisual, video and television equipment and systems
Safety requirements for maintenance and operation
Safe handling and operation of audiovisual, videoand televisionequipmentand systemsPromulgated on December 28, 1990
Implementation on October 1, 1991
Promulgated by the State Bureau of Technical Supervision
National Standard of the People's Republic of China
Audiovisual, video and television equipment and systems
Safety requirements for maintenance and operation
Safehandling and operation of audiovisual, videoand television equipment and systemsGB12641—1990
This standard is equivalent to the international standard EC574-7 "Audiovisual, video and television equipment and systems, Part 7: Safe maintenance and operation of audiovisual equipment".
1 Subject and scope of application
This standard specifies the safety requirements for the maintenance and operation of audio-visual, video and television equipment and systems. This standard applies to the safe maintenance and operation of audio-visual, video and television equipment and systems. Its purpose is to enable those who come into contact with or operate audio-visual equipment to follow them in educational or training situations and take appropriate protective measures to ensure safety. 2 Equipment safety
All equipment used should comply with national and internationally recognized safety standards at all times. See Appendix A (reference). 3 Equipment storage and transportation
3.1 Except for equipment designed for a wider temperature range, equipment should be stored in a dry place with a temperature between 15 and 35°C. 3.2 In hot or cold weather, equipment should not be stored in sealed vehicles. 3.3 During transportation, the equipment should be protected from rain, snow and any other form of moisture. When transportation between extreme temperatures is unavoidable, care should be taken to avoid the risk of electric shock caused by condensation. Equipment affected by such condensation should be thoroughly dried before connecting to the power supply. 3.4 The equipment transport device (handcart or various transport vehicles) should have sufficient strength and stability to ensure the safe transport of the load. The device should be able to be used freely and flexibly, and its fixings, wheels and tires should be checked regularly. The periphery of the load-bearing surface should have raised ribs or some measures to fix the load.
When the height of the load blocks the operator's front view, special attention should be paid, and the transport device should be operated smoothly and slowly. It should also be very careful when the ground height changes, and appropriate auxiliary measures should be used. 3.5 The carrying handle should be firm and intact.
3.6 Heavy equipment should be carried by people with strong physical strength. 4 Matters to be noted before using the distribution equipment
The following inspection should be carried out by the "designated person" (referring to a person who has been specially trained, performs a certain task, and has the corresponding safety qualifications and experience) to ensure that it is done.
4.1 The power supply voltage, frequency and fluctuation range of the equipment should be compatible with the local power grid power supply. Its multi-purpose power supply voltage selector should be adjusted to the correct position.
4.2 Remove all screws and other clamping devices or packaging used for transportation from the new equipment. Approved by the State Administration of Technical Supervision on December 28, 1990 and implemented on October 1, 1991
GB12641-—1990
4.3 All covers and handles of the equipment should be firm and intact. The outer shell should be free of cracks or holes. All knobs, keys and other operating controls should be complete and intact.
4.4 All ventilation and exhaust holes should be free of obstruction, and all protective grilles should be free of damage. 4.5 The equipment should not have any sharp edges, corners or protrusions that could injure people. 4.6 The insulation of all current-carrying wires of the power grid (double insulation is required) should be in good condition. 4.7 All plugs and sockets of the power grid power cord should be in good condition, without cracks or missing parts, and all fixing screws should be secure. 4.8 The cable clamp or strain relief device should clamp the outer sheath of the power cable. 4.9 No strand of the wire should constitute an electrical path to the outside of any plug or socket. 4.10 The internal connection of the detachable plug should be tightened with the terminal screw, and there should be no unconnected or loose strands. 4.11 Plugs and distribution boards with internal fuses should have fuses of the correct rating. 5 Site selection, installation and power supply preparation of equipment 5.1 Equipment powered by the mains should be avoided from being used outdoors or in any humid place, except for equipment specially designed for it. 5.2 The projection screen and folding stand should be assembled or disassembled with care to prevent the auxiliary equipment parts from injuring people. The equipment stand or support should have sufficient strength and stability. For independently supported screens, it should be ensured that it can withstand strong airflow or wind. The stand or support should be erected on flat ground and positioned to minimize the risk of accidental tipping. In order to ensure maximum safety, there should be no audience area near the stand or support supporting heavy equipment. 5.3 The support arms used for equipment supported on the wall or mounted on the ceiling should be reliable and inspected regularly. It is recommended to use a safety protection chain. 5.4 Projection screens, sign boards, etc. installed on the wall should be checked regularly to see if the screws are lost or if the fixings are damaged to ensure the normal operation of the lifting mechanism.
5.5 All cables, especially the mains power cables, should be carefully fixed. For example, cables crossing doorways are a potential hazard. Cables should not come into contact with metal frames, and various measures should be taken to ensure that the cables do not knock people over or cause equipment to fall from the stand or support. Cables should be brightly colored to reduce the risk of falling over. Orange cables are easier to see than dull cables. 5.6 External power cables should be safely assembled and their current ratings should meet the requirements of the equipment. Coiling cables should never be used because coiling can heat up and cause the cables to melt or catch fire. External power cables should generally not be led from one room or corridor to another. This is to avoid the possibility of dangerous high voltages on the equipment due to the combination of different phases in certain circumstances. 5.7 When a multi-channel adapter is used in the mains power socket, care should be taken to ensure that the socket is not overloaded. A better approach is to use a professionally manufactured wiring board with properly installed fuses and power indicator lights. For equipment that relies on the ground wire to achieve safe operation, the three-pole socket adapter must never use a two-pole plug. Cracked or missing power sockets should not be used, and each socket should be installed reliably. Any switch or indicator light should function correctly. Sockets, plugs and converters that cause overheating or cause the power to go on and off should not be used. Such problems should be reported to the designated person.
5.8 All power switches, including those on the equipment, should be in the dry-off position before connecting the power supply. 6 Precautions when connecting the equipment to the power supply
6.1 If the power cable, connector or any component is not selected correctly, or the equipment is faulty, there is a risk of electric shock when touching the equipment with wet hands or standing on wet ground. Only equipment designed specifically for wet conditions should be used in wet conditions. 6.2 If the power cord is removable, the user should ensure that the power cord that matches the equipment is used and that the power cord is connected to the equipment before plugging into the power supply.
6.3 Equipment that needs to be safely grounded (generally referred to as Class I equipment) must be reliably grounded. Only equipment with Class I insulation structure does not need to use grounding measures. This type of Class 1 equipment is often represented by the following symbol "double insulation". Drawing
GB 12641—1990
The power socket on Class I equipment is only allowed to connect to Class I equipment. The power socket on Class I equipment is only allowed to connect to Class I equipment or equipment with a safe grounding point. And this grounding point must be reliably connected to the safety grounding terminal. 7 Matters to be noted when the equipment is workingbzxZ.net
7.1 All removable safety protection plates and panels should be in normal positions. Before powering on, the doors and covers of the equipment should be reliably closed. 7.2 Before turning on the power switch, all volume controllers should be adjusted to the minimum position to avoid the possibility of the volume hurting the human ear when turning on the power. This is especially important for children with sensitive hearing. The headphone socket of a good device adopts a certain degree of function to prevent excessive volume from damaging the human ear. Only certain types of headphones can be safely connected to the speaker output sockets. Such connections should be made with the advice of the designated person. When using headphones with an internal volume control, ensure that the volume of the control is turned down before listening. 7.3 No moving part of the equipment should be intentionally stopped or locked. Care should be taken to avoid contact between fingers, hair, clothing, jewelry, etc. and moving parts.
7.4 Never observe the projector lens or open the lamp inspection door when the projection lamp is connected to the power supply. 7.5. Ensure that the ventilation vents are not blocked to allow the cool air to circulate. Prevent floating paper etc. from being sucked against the air inlet grilles, especially all air inlets under the equipment. Avoid contact with the lampshade grilles and adjacent areas, which may heat up and cause burns if touched for too long. 7.6 Be careful when replacing a defective bulb, as it is very hot. First turn off the switch of the equipment and unplug the power plug from the power socket. Allow the defective bulb and adjacent areas to cool before installing a new bulb. Before installing a new bulb, check the bulb rating mark or the manufacturer's technical manual to ensure that the correct type and electrical rating are replaced. Never use a bulb with a higher rating than recommended, as this may be dangerous.
Xenon arc discharge bulbs operate under great pressure, even when cold. When the bulb heats up, the pressure increases greatly. Such bulbs should be maintained by designated personnel wearing goggles and gloves. 7.7 Fuses of the correct rating must be used for replacement. Fuses with a higher rating than that recommended for the equipment and power supply should not be used. If a replaced fuse fails again, the equipment switch should be disconnected and the designated person should be notified. 7.8 Unless the equipment is specifically approved for unattended operation, the equipment should be operated by someone. 7.9 Before the equipment is returned to the storage place, the power cord should be repacked and coiled securely. 8 Equipment failure
8.1 If the equipment fails, the power switch of the equipment should be turned off and the plug should be unplugged from the power socket. 8.2 Equipment with known failures should be clearly marked to warn anyone who wants to use the equipment. 9 Routine safety inspection 1)
9.1 All equipment and power supplies should be safety inspected at a period determined by the designated person. This period should not exceed one year. Such inspections should only be carried out by designated persons.
9.2 The inspection procedures and instruments should usually be agreed upon between the relevant equipment manufacturers, the power supply bureau and the relevant government departments or agencies. 9.3 Any faults found should be eliminated by the designated person. Note: 1) It is not appropriate to use the original severity level in the test method of the corresponding safety standard (such as GB8898) for periodic safety inspections, because doing so may cause cumulative damage to the equipment, such as insulation failure. 10 Electric shock
Widely publicize the guidance methods for correct rescue when people are electrocuted through demonstration posters and training courses. 3
GB4793
GB8898
IEC364
IEC380
IEC414
IEC446
IEC447
IEC529
IEC536
Safety requirements for electronic measuring instruments
GB12641—1990
Appendix A
Related safety standards
(reference Components)
Safety requirements for household and similar general purpose electronic and related equipment powered by mains power supply Building electrical installations
Safety of electric office machinery
Safety requirements for indicating and recording electrical measuring instruments and their accessories Identification of insulation and bare conductors by color
Standard guide for controlling the movement of actuators of working electrical equipment Classification of enclosure protection levels
Classification of protection against electric shock of electrical and electronic equipment
Additional notes:
This standard was proposed by the Ministry of Machinery and Electronics.
This standard was drafted by the Third Research Institute of the Ministry of Machinery and Electronics Industry and other units. The main drafters of this standard are Wang Chunyu and Zhang Bin.
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