This standard specifies the basic operation and use requirements for the safety of electricity use of various underwater electrical equipment related to underwater operations of divers, as well as various underwater electrical structures and facilities that may pose a hazard to underwater divers. This standard applies to the safe operation and management of electricity use of various diving systems, equipment, underwater operation equipment and underwater structures and facilities related to underwater operations of divers. GB 17869-1999 Safety Operation Procedures for Underwater Electricity Use by Divers GB17869-1999 Standard Download Decompression Password: www.bzxz.net

GB17869-1999
This standard is formulated based on the actual situation of diving and underwater engineering technology in my country, and with reference to the relevant contents of Part 2 "Installation and Use of Equipment" of the "Safety Code of Practice for Underwater Electricity Use" of the International Association of Offshore Engineering Diving Contractors (English abbreviation: AODC, now renamed: International Marine Contractors Association, English abbreviation: IMCA). The provisions of this standard for the installation, operation and use of electrical devices used in deck decompression chambers (DDC), emergency transfer systems, diving bells, lock-type submersibles, underwater work chambers, manned submersibles, remotely operated submersibles, umbilical cords, batteries, and surface power distribution equipment are consistent with the relevant regulations of the current national ship inspection agency. This standard is a supporting standard for GB16636-1996 "Technical Specifications for Underwater Electricity Use Safety for Divers". This standard is proposed by the Ministry of Communications of the People's Republic of China. This standard is under the jurisdiction of the Technical Committee for Standardization of Salvage and Underwater Engineering of the Ministry of Communications. Drafting units of this standard: Ministry of Communications, Ministry of Petroleum Marine Underwater Engineering Science Research Institute. The main drafters of this standard are: Zhang Guoguang, Lu Lianfang, Xie Changjiang, Jing Yanlin, Dong Jianshun, Gao Jiandong, Lin Wenzhong. 359
1 Scope
National Standard of the People's Republic of China
Operating rules for diver's safe use of electricity under water
GB17869--1999
This standard specifies the basic operation and use requirements for the safe use of electricity of various underwater electrical equipment related to the underwater operation of divers, as well as various underwater electrical structures and facilities that may pose a hazard to underwater divers. This standard applies to the safe operation and management of electricity use of various diving systems, equipment, underwater operation equipment and underwater structural facilities related to the underwater operation of divers.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB6722-1986 Explosive Safety Regulations
GB16560-1996 Deck Decompression Chamber
GB 16636-1996
Technical Specifications for Underwater Electricity Safety for Divers
3 Definitions
This standard adopts the following definitions.
3.1 Active protection active protection
Anti-electric shock measures using protective devices that can detect actual or potential electric shock situations and take corresponding actions to respond, such as: residual current protection devices, line insulation monitoring protection devices, etc. 3.2 Passive protection passive protection Anti-electric shock measures that reduce the possibility of electric shock by intrinsic means, such as: insulation, shielding and grounding, etc. 3.3 Fully-protective diving suit fully-protective diving suit adopts measures such as complete insulation, complete conductivity, or a combination of insulation and conductivity to avoid the danger of electric shock caused by potential gradients in water.
3.4 ​​Isolation transformer is a transformer whose input and output windings are electrically isolated to avoid accidental contact with the earth and live parts (or live metal parts due to insulation damage) at the same time, which may cause harm. 3.5 Line insulation monitor, LIM is an active protection device that continuously monitors the insulation integrity between the live conductor and the grounding loop, and triggers an alarm or circuit breaker when the measured insulation impedance drops below a predetermined value. If the circuit breaker contains a line insulation monitor, it is called a line-insulation circuit breaker (LICB), approved by the State Administration of Quality and Technical Supervision on September 17, 1999, and implemented on August 1, 2000. GB17869--1999. 3.6 Residual current device, RCD When the current between the power supply and the load is different, it can determine the leakage current and respond by cutting off the power supply through the circuit breaker trip device, also known as earth leakage circuit breaker. 3.7 Automatic trip device trip device A protective device that can automatically cut off the power supply immediately when a fault is determined, such as a residual current device, a line insulation monitor with an automatic trip mechanism, etc. 3.8 Fault current Fault current The current caused by insulation damage or insulation short circuit. 3.9 Wet welding and cutting Welding and cutting operations performed in wet conditions in water. 4 Basic requirements
4.1 Personnel engaged in the installation, modification and maintenance of electrical facilities of diving systems, equipment, underwater operation equipment and underwater structural facilities related to the safety of underwater operations of divers should be professionals who are proficient in electrical installation procedures, familiar with the dangers and problems of underwater engineering practice, hold national accreditation certificates, and are familiar with the relevant provisions of the current national ship inspection agency, GB16636 and the relevant contents of this standard. 4.2 All types of portable and fixed electrical facilities or devices related to the safety of underwater operations of divers must establish corresponding technical files, be regularly inspected by professionals, and the inspection results must be recorded and archived to ensure the integrity and reliability of all protective structures of these electrical facilities or devices.
4.3 Before using various electrical facilities, devices, or temporary electrical equipment related to the safety of underwater operations of divers, it is necessary to first check and ensure that these electrical facilities, devices or equipment have met the relevant provisions of the current national ship inspection agency, GB16636 and the requirements of this standard. 4.4 Before diving and underwater operations, you must first check and understand the electrical characteristics and experimental conditions of underwater structures and facilities, seabed devices or high-power equipment in the vicinity of the operating waters. If necessary, appropriate emergency precautions should be formulated to ensure the safety of underwater divers.
4.5 The installation, modification and maintenance of electrical facilities of various diving systems, equipment and tools, underwater operating equipment and underwater structures and facilities related to the safety of divers' underwater operations must follow the following points! a) All electrical circuits with voltages greater than 6V should have corresponding fuses/circuit breakers for short-circuit protection; 1) Electrical conductors should have sufficient cross-sectional area to pass the full load current, overload current, and the barrier current that may pass during the action time of the protection device; c) The joints in the electrical circuit must be reliable and their number should be minimized; d) The electrical connection terminals used must be structurally complete and have a certain length of wire tail cable; e) The wire path selection should avoid places prone to mechanical damage and be fixed, and some form of mechanical protection should be provided when necessary; 1) The wiring of electrical circuits should be separated to avoid damage to cross-circuits or short circuits; g) The terminal box of the electrical circuit must be sealed to avoid moisture intrusion; h) Common feedback loops shall not be used, each loop should work independently, and each protection loop should be separated and have conspicuous signs. When a certain When a circuit fails, it will not affect the normal operation of other circuits; i) The marking sleeve of the electrical line should be installed at a certain distance from the end to reduce the impact of the group of substances that may be produced by the heating of the marking sleeve on the safety of divers:
) Good performance tracing marking materials should be used, and sufficient tracing distance should be arranged in the design of plugs, sockets, wiring and printed circuit boards to ensure that there is still a corresponding gap after the surface is scaled; k) Soft soldering shall not be used in stranded cables or flexible cables, and corresponding support shall be taken for wiring when necessary; 1) Regularly check the mechanical damage and insulation performance of the cable, and pay attention to the changes in the electrical safety performance of related equipment: m) The active protection device in the electrical circuit must be inspected regularly, and the inspection results must be recorded and archived; n) Adhere to the inspection and recording of the electrical safety performance of underwater electrical facilities and equipment to ensure that they meet the design safety standards. At the same time, any repairs to the above electrical facilities and equipment must be recorded and archived. 4.6 Insulation of electrical facilities of various diving systems, equipment, underwater operation equipment and underwater structural facilities related to the safety of divers' underwater operations.The following requirements must be followed: a) Electrical insulation related to diving and underwater operations must meet the relevant provisions of GB16636; b) When using double-layer sheaths with electrical shielding, sealing arrangements (such as "" rings and pressure balance terminals, etc.) should be combined to improve the double insulation performance. wwW.bzxz.Net
) The insulation of the electrical system is improved by connecting an isolation transformer between the power supply and the entire electrical system (including the transformer and all devices) to ground and insulate; d) Active protection devices should be used in the electrical system to avoid electric shock to divers due to insulation failure; e) Regularly check the power supply and its application equipment The electrical insulation and sealing of the cable should be checked and any problems found should be corrected in time. For cables used for deep underwater operations, their insulation and sealing should be ensured in particular. 1) During operation, avoid contact between the wires in the circuit and the crane ropes, steel platform legs, or the ship hull on the water surface to avoid the electric shock hazard caused by the connection to the existing circuit:
Name) The entire circuit (transformer secondary coil, connecting cables and loads, etc.) should have a high insulation impedance to the ground. At the same time, the capacitance of the circuit to the ground must be limited. In practice, the capacitance to the ground can be limited by limiting the maximum length of the cable connecting the transformer secondary coil to the load. 5 Operating procedures
5.1 Deck decompression chamber (DDC) and emergency transfer system 5.1.1 In the deck decompression chamber (DDC) and emergency transfer system facilities (including various cabin equipment), if no automatic tripping protection device is installed, only power supplies with a rated voltage not exceeding AC 6V or DC 24V are allowed to be used in the cabin. 5.1.2 If the primary power is taken from a 380V (440V) three-phase AC power supply, it should be stepped down, insulated and rectified to provide a safe AC 6V power supply or DC 24V power supply for the cabin.
5.1.3 The working power supply of the test equipment is AC 220V, and the excitation voltage of various sensors should not be higher than DC 10V (typical current is 15 mA). Protection measures should be taken for instruments related to sensors. 5.1.4 Other relevant regulations shall be in accordance with GB16560. 5.2 Diving bells and gate-type submersibles
5.2.1 All primary power is supplied by the main isolation transformer on the surface. The transformer should be grounded to limit the maximum fault current to no more than 1A through the corresponding grounding resistor. An active protection device with an action response time of no more than 20ms should also be installed in the circuit. 5.2.2 The power inside the diving bell is a DC 24V power supply, which is provided by the transformer and rectifier power supply of the surface pressure vessel installed outside the diving bell.
5.2.3 The AC 220V power supply for the external lighting of the diving bell shall be protected by an isolation transformer with limited fault current and an active protection system consisting of a residual current protection device (RCD). 5.3 Underwater working chamber
5.3.1 All primary power is provided by the main isolation transformer. All power in the underwater working chamber shall be taken from the additional isolation transformer on the underwater working chamber.
5.3.2 The umbilical cable shall be continuously monitored for insulation breakdown by a line insulation monitor. The line insulation monitor monitors the changes in circuit insulation by monitoring the leakage resistance and providing continuous readings. 5.3.3 Hazardous power sources in the underwater working chamber (such as preheating power and portable tool power, etc.) shall also be continuously monitored by a line insulation monitor.
5.4 Electric Heating Diving Suit
5.4.1 The maximum voltage of electric heating diving suit shall not exceed the safety value specified in GB16636. The insulation and conductive fabric of electric heating diving suit shall be flame retardant, high temperature resistant and non-toxic materials. 5.4.2 Before wearing electric heating diving suit for diving operation, divers shall conduct strict appearance inspection and electrical safety performance test on electric heating diving suit and its circuit. Those that fail the safety performance test shall not be used. 5.5 Manned Submersible
5.5.1 In manned diving facilities, only power supply of no more than DC 24V is supplied in the cockpit for life support and control circuits. 5.5.2 The primary power supply of manned submersible comes from the ship's 380V (440V) three-phase AC power supply system, and high voltage power supply shall be provided to the umbilical cord through an isolation transformer. The power supply shall be monitored by a line insulation monitor and an automatic tripping action response shall be established for faults. 5.5.3 The equipment container for placing the transformer and handling the rectifier and its control circuit for powering the submersible should be placed outside the submersible.
5.6 Remotely Operated Submersible
5.6.1 The primary power supply is transformed by the ship's 380V (440V) three-phase AC power supply system, and the required power is provided to the power unit installed on the submersible through a cable through an isolation transformer. The power supply should be monitored by a line insulation monitor connected to the alarm. 5.6.2 The lighting and control lines should also be installed in the above manner and monitored by a second line insulation monitor. 5.6.3 When divers work together with remotely operated submersibles, appropriate safety protection measures must be taken, such as: divers should wear full anti-electric diving suits for work.
5.7 Umbilical
The cables in the umbilical cord should take active protection measures, and the power cord should be connected to the isolation transformer installed on the water surface. 5.8 Portable equipment
5.8.1 For the electrical devices of portable equipment (such as non-destructive testing equipment, etc.) used by divers, if the primary power is taken from the 380V (440V) three-phase AC power supply system, it should be reduced to the required voltage through an isolation transformer. 5.8.2 The secondary winding of the isolation transformer should be grounded through a resistor with a limited fault current of 1A, and an automatic tripping device (such as residual current protection device, etc.) with an action response time of no more than 20ms should be installed in the circuit. 5.9 Submarine equipment
5.9.1 In the electrical facilities of high-power subsea equipment (such as suction dredging pumps), the power supply to the motor should be provided from the 380V (440V) three-phase AC power supply system on the water surface through the umbilical cord, and the insulation performance and grounding shielding performance of the main umbilical cord cable and the motor connector should be ensured.
5.9.2 The power supply is supplied by an isolation transformer installed on the water surface, and the current leaking from the secondary winding to the ground wire should be continuously monitored using a line insulation blue monitor. If the leakage impedance drops to the preset value, the power supply should be automatically cut off. 5.9.3 Divers assisting the operation of submarine equipment should wear insulating gloves and take appropriate safety protection measures. 5.10 Wet welding and cutting
Before implementing wet welding and cutting operations, it is necessary to carefully check whether the welding equipment and its layout, wiring, grounding, etc. fully comply with the relevant national safety technical specifications and other requirements.
5.10.1 In order to protect the operating divers, a reliable special knife switch or contactor for cutting off the power supply should be provided in the welding circuit, which can forcibly cut off the power supply at any time. The switch should be managed and operated by a dedicated person and must meet the following requirements: a) The operator should be able to see the contact status when it is turned on; b) The switch should be reliable, stable and easy to operate; e) The switch should be equipped with a slotted cover to ensure that it will not be automatically opened due to vibration, and it must be closed when not in operation. 5.10.2 All cables used for welding or cutting must meet the following conditions: a) If parallel connection is required, multi-core soft rubber cables with sufficient cross-section should be used, especially cables with longer lengths. Excessive voltage drop of the cables should be avoided. b) The length of the cables should be kept as short as possible while meeting the operating requirements. c) The cables should be bundled and arranged at intervals and not close together. d) Cables connected in parallel should have the same conductivity and polarity and be arranged diagonally in reverse phase. e) The cables should have corresponding protective covers at the point where they enter the connector to reduce electrical friction and avoid damage. f) The cable should consist of two completely insulated conductors, one of which connects the negative terminal of the welding (or cutting) device to the welding torch (or cutting torch), and the other conductor is connected to the positive terminal of the device and overlapped on the workpiece. Joints in the middle of the relay should be avoided as much as possible, and all joints should be completely insulated.
5.10.3 The electric oxygen cutting device must meet the following conditions: a) The electric oxygen cutting device should be designed with an oxygen valve, which must always ensure that it is in contact with the cutting edge; b) The cutting edge should have an electrical insulation sleeve: The electrical insulation sleeve should have high wear resistance and will not cause the insulation performance to deteriorate due to long-term immersion in seawater.
5.10.4. Divers must strictly abide by the safety operating procedures, including: a) welding, cutting torches, cables, etc. must be insulated: the outside of the diving helmet and collar should be coated with insulating paint or covered with insulating rubber; 6) Divers must wear insulating gloves from beginning to end to provide additional safety protection; c) Since the end of the welding torch (or cutting torch) is not insulated from water, it should be at a certain safe distance from the diver's hand; when in use, the welding rod (or cutting rod) should not be consumed to less than the minimum safe length, and the safe distance from the hand to the welding torch (or cutting torch> The top should be not less than 100mm;) All welding or cutting equipment (including cables and connectors) should be checked by professionals before use to determine whether they are in a safe state:
e) A circuit breaker control device with a certificate of inspection should be used: use Before use, make sure that the device is in the power-on and disconnected state: 1) Before the workpiece is lowered or lifted, the flash (or cutting torch) should be checked to ensure that the welding circuit is disconnected and there is no welding rod (or cutting rod) on the welding torch (or cutting torch).
g) Explosion rods (or cutting rods) with good insulating coatings should be used. For welding rods (or cutting rods) that have been submerged in water for a long time, if the coating absorbs water, they must be scrapped;
) Before welding or cutting, check and remove flammable solids, liquids or gases inside or near the workpiece. 1) Check that there is no gas accumulation space above the working area. It is strictly forbidden to perform welding (carrying cutting) operations under the diving bell: J) Be careful when using conductive tools and items (such as wrenches and backpacks, etc.) carried by divers. , avoid contact with live electrodes and cause electric shock:
k) When the power switch is closed, the welding rod (or cutting rod) must not be replaced or fixed: the live welding torch (or cutting torch) must not be put down or carried; 1) The connecting (cutting) equipment must never be taken into a diving bell or a gated submersible; once the welding torch (or cutting torch) has a problem, it must be sent back to the surface for inspection;
) A properly designed and maintained welding torch (or cutting torch) must be used. The welding rod (or cutting rod) must be inserted into the head of the welding torch (or cutting rod) so that it can be firmly placed in the rubber seal inside the welding torch (or cutting torch) head: Under no circumstances should the welding torch (or cutting torch) be pushed against yourself: n) Both the diving caretaker and the diving commander should be able to directly or with the help of underwater television, or through the diving telephone , keep abreast of the welding (or cutting) operations being performed by the diver; o) When welding (or cutting) in the underwater work chamber, the welding rod (or cutting rod) should not have an additional wax layer or glue to avoid the above materials from producing toxic or flammable substances
5.10.5 The welding circuit can only be turned on under the following conditions: a) The diver has stood at the position to start welding (or cutting), and this position must be stable; ) The clamps of the connecting parts have been clamped;
c) The welding rod (cutting rod) is actually installed on the welding stove (or cutting torch), and the fingers are away from the diver and as close to the workpiece as possible; d) There should be no diving equipment or diving gear between the welding torch and the workpiece to avoid electric field injuries; e) The diver is sure that he is ready and notifies the surface personnel again. 5.11 Impressed current device
5.11.1 The anode voltage of the impressed current device must be within the safe range, and appropriate passive protection measures must be taken. 5.11.2 Appropriate protective measures should be taken to prevent the external current device system from being polarized. 5.11.3 Divers should, as far as possible, conduct underwater operations with the power supply of the external current device system cut off. Otherwise, the electric field strength of the nearby waters must be detected first, and appropriate protective measures must be taken before underwater operations can be carried out. 5.12 High-power equipment
GB17869-1999
5.12.1 The power supply of high-power equipment cannot usually be interrupted at will. Before the diving operation begins, detailed inquiries, investigations and possible hazard assessments should be carried out, and necessary safety protection measures should be proposed. 5.12.2 In the case where the safety of high-power equipment cannot be ensured (even if a tangible protective fence is used), the operator should make corresponding requirements for the insulation level of the equipment before the diving operation begins. 5.12.3 In the case where the existing power supply of high-power equipment cannot be interrupted, necessary anti-electric shock protection must be taken for the operating divers to protect the safety of the diving operators.
5.13 Surface power distribution equipment
Maintenance or modification related to underwater electrical equipment must be remembered: The installation, operation and use of surface power distribution equipment related to underwater operations of divers must be strictly carried out in accordance with the provisions of relevant national ship inspection regulations. 5.14 Underwater blasting
This regulation only involves underwater blasting operations detonated by electrical means. In addition to meeting the relevant provisions of GB6722 and GB16636, underwater blasting operations should also follow the following requirements
a) It is strictly forbidden to carry out electric welding, electric oxygen cutting or other underwater operations unrelated to underwater blasting at the same time as underwater blasting operations. 6) Before detonating the explosives for underwater blasting, the operating divers must have evacuated the waters where underwater blasting is to be carried out, and no divers may stay in the waters where underwater blasting is to be carried out. Surface personnel and ships must also evacuate to safe waters. 5.15 Batteries
5.15.1 Before using batteries, the condition of the batteries must be checked. Both primary batteries (non-rechargeable batteries) and secondary batteries (rechargeable batteries) should be provided with adequate short circuit protection. 5.15.2 When loading and unloading batteries, the risk and hazards of electric shock, burning or leakage caused by accidental short circuit by metal tools, leakage or overflow of electrolyte, etc. should be avoided.
5.15.3 Fuses should be installed as close to the batteries as possible and should be sealed to avoid burning fuses due to ignition of hydrogen gas that may be present.
5.15.4 The location where the batteries are placed should be completely watertight. 5.15.5 The batteries may produce explosive hydrogen gas during charging and discharging. Therefore, secondary batteries should be charged on the surface with proper ventilation:
5.15.6 In fixed facilities, where underwater charging is required, the running voltage should be limited to below the bubbling voltage level: otherwise, the required working voltage should be achieved by adding additional batteries. 5.15.7 In addition to providing a device that does not recombine hydrogen and oxygen, overcharging should be avoided to avoid electrolyte transfer and device failure caused by overcharging.
5.15.8 If there is a possibility of relative movement between batteries, flexible electrical connectors should be used. 6 Precautions
6.1 When a diver receives electric shock, the surface diving commander shall promptly take the following measures: a) Turn off the power supply related to underwater tools and equipment; b) Inquire about the details of the electric shock suffered by the diver and take appropriate rescue measures according to the degree of harm; c) Check the insulation and safety of all cables, lines, tools and equipment related to this underwater operation; d) Check whether the diver’s clothing, position and operating procedures are correct; e) Determine the cause of the electric shock and take appropriate protective measures. 6.2 When a diver receives serious electric shock: The surface diving commander must immediately take the following measures: a) Turn off all underwater operating power supplies (except life support systems); b) Organize emergency rescue of the diver who received electric shock and transfer him to relevant medical institutions; c) Check the insulation and safety of all cables, lines, tools and equipment related to this underwater operation; d) Investigate the cause of the electric shock accident and submit a written investigation report. 365
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6.3 After a diving electric shock accident occurs, underwater operations may only be resumed after any possible risk of electric shock has been eliminated and appropriate protective measures have been taken.3 After a diving electric shock accident occurs, underwater operations can only be resumed after any possible electric shock hazard has been eliminated and appropriate protective measures have been taken.3 After a diving electric shock accident occurs, underwater operations can only be resumed after any possible electric shock hazard has been eliminated and appropriate protective measures have been taken.2 In the case that the safety of high-power equipment cannot be ensured (even if a tangible protective fence is used), the operator shall make corresponding requirements for the insulation level of the equipment before the diving operation begins. 5.12.3 In the case that the existing power supply of high-power equipment cannot be interrupted, necessary anti-electric shock protection must be taken for the operating divers to protect the safety of the divers.
5.13 Surface power distribution equipment
Maintenance or modification related to underwater electricity must be remembered: The installation, operation and use of surface power distribution equipment related to divers' underwater operations must be strictly carried out in accordance with the provisions of the relevant national ship inspection regulations. 5.14 Underwater blasting
This regulation only involves underwater blasting operations detonated by electrical means. In addition to meeting the relevant provisions of GB6722 and GB16636, underwater blasting operations shall also follow the following requirements
a) It is strictly prohibited to carry out electric welding, electric oxygen cutting or other underwater operations unrelated to underwater blasting at the same time as underwater blasting operations. 6) Before detonating the explosives for underwater blasting, the operating divers must have evacuated the waters where underwater blasting is to be carried out, and no divers are allowed to stay in the waters where underwater blasting is to be carried out. Surface personnel and ships must also evacuate to safe waters. 5.15 Batteries
5.15.1 Before using the batteries, the condition of the batteries must be checked. Both the primary batteries (non-rechargeable batteries) and the secondary batteries (rechargeable batteries) should be provided with adequate short circuit protection. 5.15.2 When loading and unloading batteries, the risks and hazards of electric shock, burning or leakage caused by accidental short circuits by metal tools, leakage or overflow of electrolytes, etc. should be avoided.
5.15.3 The installation of the fuse should be as close to the battery as possible and should be sealed to avoid burning the fuse due to ignition of possible hydrogen-containing gas.
5.15.4 The location where the battery is placed should be completely watertight. 5.15.5 The battery may produce explosive hydrogen during charging and discharging. Therefore, the secondary battery should be charged on the water surface with proper ventilation.
5.15.6 In fixed facilities, if underwater charging is required, the running voltage should be limited to less than the bubbling voltage level. Otherwise, the required working voltage should be achieved by adding additional batteries. 5.15.7 In addition to providing a device that does not allow hydrogen and oxygen to recombine, overcharging should be avoided to avoid electrolyte transfer and device failure caused by overcharging.
5.15.8 If there is a possibility of relative movement between batteries, flexible electrical connectors should be used. 6 Precautions
6.1 When a diver receives electric shock, the surface diving commander shall promptly take the following measures: a) Turn off the power supply related to underwater tools and equipment; b) Inquire about the details of the electric shock suffered by the diver and take appropriate rescue measures according to the degree of harm; c) Check the insulation and safety of all cables, lines, tools and equipment related to this underwater operation; d) Check whether the diver’s clothing, position and operating procedures are correct; e) Determine the cause of the electric shock and take appropriate protective measures. 6.2 When a diver receives serious electric shock: The surface diving commander must immediately take the following measures: a) Turn off all underwater operating power supplies (except life support systems); b) Organize emergency rescue of the diver who received electric shock and transfer him to relevant medical institutions; c) Check the insulation and safety of all cables, lines, tools and equipment related to this underwater operation; d) Investigate the cause of the electric shock accident and submit a written investigation report. 365
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6.3 After a diving electric shock accident occurs, underwater operations may only be resumed after any possible risk of electric shock has been eliminated and appropriate protective measures have been taken.2 In the case that the safety of high-power equipment cannot be ensured (even if a tangible protective fence is used), the operator shall make corresponding requirements for the insulation level of the equipment before the diving operation begins. 5.12.3 In the case that the existing power supply of high-power equipment cannot be interrupted, necessary anti-electric shock protection must be taken for the operating divers to protect the safety of the divers.
5.13 Surface power distribution equipment
Maintenance or modification related to underwater electricity must be remembered: The installation, operation and use of surface power distribution equipment related to divers' underwater operations must be strictly carried out in accordance with the provisions of the relevant national ship inspection regulations. 5.14 Underwater blasting
This regulation only involves underwater blasting operations detonated by electrical means. In addition to meeting the relevant provisions of GB6722 and GB16636, underwater blasting operations shall also follow the following requirements
a) It is strictly prohibited to carry out electric welding, electric oxygen cutting or other underwater operations unrelated to underwater blasting at the same time as underwater blasting operations. 6) Before detonating the explosives for underwater blasting, the operating divers must have evacuated the waters where underwater blasting is to be carried out, and no divers are allowed to stay in the waters where underwater blasting is to be carried out. Surface personnel and ships must also evacuate to safe waters. 5.15 Batteries
5.15.1 Before using the batteries, the condition of the batteries must be checked. Both the primary batteries (non-rechargeable batteries) and the secondary batteries (rechargeable batteries) should be provided with adequate short circuit protection. 5.15.2 When loading and unloading batteries, the risks and hazards of electric shock, burning or leakage caused by accidental short circuits by metal tools, leakage or overflow of electrolytes, etc. should be avoided.
5.15.3 The installation of the fuse should be as close to the battery as possible and should be sealed to avoid burning the fuse due to ignition of possible hydrogen-containing gas.
5.15.4 The location where the battery is placed should be completely watertight. 5.15.5 The battery may produce explosive hydrogen during charging and discharging. Therefore, the secondary battery should be charged on the water surface with proper ventilation.
5.15.6 In fixed facilities, if underwater charging is required, the running voltage should be limited to less than the bubbling voltage level. Otherwise, the required working voltage should be achieved by adding additional batteries. 5.15.7 In addition to providing a device that does not allow hydrogen and oxygen to recombine, overcharging should be avoided to avoid electrolyte transfer and device failure caused by overcharging.
5.15.8 If there is a possibility of relative movement between batteries, flexible electrical connectors should be used. 6 Precautions
6.1 When a diver receives electric shock, the surface diving commander shall promptly take the following measures: a) Turn off the power supply related to underwater tools and equipment; b) Inquire about the details of the electric shock suffered by the diver and take appropriate rescue measures according to the degree of harm; c) Check the insulation and safety of all cables, lines, tools and equipment related to this underwater operation; d) Check whether the diver’s clothing, position and operating procedures are correct; e) Determine the cause of the electric shock and take appropriate protective measures. 6.2 When a diver receives serious electric shock: The surface diving commander must immediately take the following measures: a) Turn off all underwater operating power supplies (except life support systems); b) Organize emergency rescue of the diver who received electric shock and transfer him to relevant medical institutions; c) Check the insulation and safety of all cables, lines, tools and equipment related to this underwater operation; d) Investigate the cause of the electric shock accident and submit a written investigation report. 365
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6.3 After a diving electric shock accident occurs, underwater operations may only be resumed after any possible risk of electric shock has been eliminated and appropriate protective measures have been taken.
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