This standard specifies the technical requirements for the safety of electricity use for various underwater electrical equipment related to underwater operations of divers, as well as various underwater electrical structures and facilities that are not directly related to underwater operations but may pose a hazard to working divers. This standard applies to the safety of electricity use for various types of diving systems, equipment and gear, underwater operating equipment and underwater structures and facilities related to divers. GB 16636-1996 Technical Specification for Safety of Underwater Electricity Use by Divers GB16636-1996 Standard download decompression password: www.bzxz.net

GB16636
This standard refers to and draws on the relevant contents of Part 1 "Underwater Electrical Application" and Part 3 "System Design" of the "Safety and Practical Code for Underwater Electricity Use" of the International Association of Offshore Engineering Diving Contractors (English abbreviation: AODC, now renamed: International Association of Underwater Engineering Contractors, English abbreviation: AUEC), and is formulated in combination with the specific actual conditions of diving and underwater engineering in my country. The provisions of this standard for the design, construction, installation and testing 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. Appendix A and Appendix B of this standard are both informative appendices. This standard was 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 unit of this standard: Marine Underwater Engineering Science Research Institute of the Ministry of Communications and the Ministry of Petroleum. The main drafters of this standard are: Zhang Guoguang, Lu Lianfang, Jing Yanlin, Xie Changjiang, Zheng Jichang, Wang Xianqun, Yu Weining. 347
1 Scope
National Standard of the People's Republic of China
Technical regulations for diver's safeuse of electricity under waterGB166361996
This standard specifies the technical requirements for the safe use of electricity for 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 working divers although they are not directly related to underwater operations. This standard applies to the safety of electricity use for various types of diving systems, equipment and gear, underwater operating equipment and underwater structural facilities related to divers.
2 Definitions
This standard adopts the following definitions.
2.1 Underwater safe use of electricity refers to avoiding or preventing various possible hazards to divers caused by the use of underwater (or pressure chamber) electrical devices (such as electric shock), as well as the production of toxic and explosive products due to the degradation of electrical insulation materials due to heat, or the ignition of certain mixed gases due to arcs and sparks generated by heated surfaces, faulty equipment, switchgear, etc. 2.2 Diving system and equipment refers to the complete set of systems and equipment (including: deck decompression chambers, diving bells, underwater work chambers and personnel transfer chambers, etc.) and various types of submersibles that can transport divers under pressure for diving operations, as well as equipment that divers must wear, maintain or wear during diving operations (such as: diving suits, underwater breathing apparatus, umbilical cords and communication equipment, etc.). 2.3 Diver's emergency transfer system refers to a series of devices that send divers underwater or out of the water in an emergency, and is one of the main equipment of the diving system. The diver emergency transfer system is equipped with air supply, electrical and audio-visual monitoring devices, which can be connected to the deck decompression chamber. 2.4 Underwater tool and equipment refers to the various tools, instruments and apparatus used by divers when working underwater. 2.5 Underwater structure and installation refers to large-scale equipment and structures that work underwater for a long time, such as: impressed current cathodic protection system, submarine oil and gas production system, submarine pipeline and underwater cable.
2.6 Operational environment refers to the surrounding environmental restrictions when underwater electrical equipment is in normal use, such as: pressure, gas, temperature, humidity of the environment, and the dress of divers.
2.7 Body safe current refers to the maximum safe current that can be allowed to flow through the diver's body. 2.8 Underwater safe distance refers to the minimum distance between the diver and the charged body when the voltage gradient in the water will not harm the diver. 2.9 Underwater habitat Approved by the State Administration of Technical Supervision on December 4, 1996 348
Implemented on August 1, 1997
GB16636-1996
Refers to a cabin structure set up near the working area and used to complete underwater welding and other work. Under the pressure of external condensed water, the interior of the working cabin has a dry but moderately gaseous environment. 2.10 Electrical-heat diving suit Refers to diving suits, pants, gloves, hats, hands, etc. that generate the necessary heat for divers to keep warm during underwater work by means of electrical heating. 2.11 Hand-held equipment Refers to various small devices carried by divers during diving operations, such as: cameras, underwater lighting fixtures, hand-held power tools and non-destructive testing (NDT) equipment.
2.12 Seabed equipment Seabed equipment Refers to hydraulic pumps or power sources that provide power for various working tools and equipment on the seabed through electrical drive. 2.13 High power equipment refers to the subsea wellhead control device and power cables in the development of subsea oil and gas, as well as other power and electrical equipment. 3 Operating environment
3.1 Deck decompression chamber (DDC) and emergency transfer system 3.1.1 Pressure: between 0 and 5 MPa, but generally within the range of 0 to 2.5 MPa, and can change at different rates. 3.1.2 Environment: compressed air in the range of 0 to 0.5 MPa, or oxygen-containing mixed gas with an oxygen partial pressure of no more than 0.05 MPa and an oxygen concentration of no more than 25%.
3.1.3 Humidity: 25 to 35°C in the saturated chamber and 0 to 50°C in the air chamber. 3.1.4 Humidity: The relative humidity in the chamber is within the range of 50% to 75%, and can be temporarily raised to 100% under special circumstances. 3.1.5 Diver's clothing: thin non-electrical protective clothing. 3.2 Diving bell and submersible with lock
3.2.1 Pressure: between 0~5MPa, but generally within the range of 0~2.5MPa, and changes rapidly. 3.2.2 Environment: compressed air in the range of 0~0.5MPa, or oxygen-containing mixed gas with oxygen partial pressure not more than 0.05MPa and oxygen concentration not more than 25%.
3.2.3 Temperature: 25~35℃ inside, which can be reduced to 10℃ under special circumstances. The outside changes in the range of 0~30℃, but generally between 5~15℃.
3.2.4 Humidity: the relative humidity inside the equipment is high, and the outside is exposed to the seawater splash zone and can be submerged by seawater. 3.2.5 Diver's clothing: thin non-electrical protective clothing. 3.3 Underwater working chamber
3.3.1 Pressure: between 0~5MPa, but generally within the range of 0~2.5MPa. 3.3.2 Environment: Compressed air in the range of 0-0.5MPa, or oxygen-containing mixed gas with oxygen partial pressure not more than 0.05MPa and oxygen concentration not more than 25%.
3.3.3 Temperature: The internal temperature varies in the range of 5~40℃. If it is in a very small cabin, the temperature can rise to 60℃ in special circumstances. 3.3.4 Humidity: It can be completely immersed in seawater under external force. During the operation, the relative humidity will vary in the range of 70%~~100%.
3.3.5 Diver's clothing: Wear rubber diving suit, conventional welding suit or heat-resistant suit. 3.4 Electric heating diving suit
3.4.1 Pressure: The external pressure depends on the diving depth, ranging from 0~5MPa, but generally within the range of 0~2.5MPa, and will not change rapidly.
3.4.2 Environment: When a diver enters or leaves a diving bell, the environment is 0~0.5MPa compressed air; or a mixed gas with an oxygen partial pressure of no more than 0.05MPa and a carrier concentration of no more than 25%. In the case of surface-supported diving, when diving into or leaving the ocean surface, it is a normal pressure environment.
3.4.3 Humidity: Depends on the water temperature at the depth, usually in the range of 5~15℃. 349
3.4.4 Humidity: The external environment is usually seawater GB16636--1996www.bzxz.net
3.4.5 Diving suit: The outside of the electric heating suit + a rubber diving suit. 3.5 Manned submersible
3.5.1 Pressure: The internal pressure is maintained at a normal pressure environment. The external pressure depends on the depth of the operation and can sometimes be as high as 10MPa. 3.5.2 Environment: The oxygen partial pressure is no more than 0.05MPa and oxygen-containing mixed gas with an oxygen concentration of no more than 25%. 3.5.3 Temperature: The internal temperature is in the range of 10-25℃, which can temporarily drop to 2℃ or rise to 35℃. The external temperature is the seawater temperature at the depth reached, that is, 0~30℃
3.5.4 Humidity: Inside the cabin, the relative humidity is high; outside the cabin, from the atmosphere (splash or immersion area) to the seawater. 3.5.5 Diver's clothing: thin non-electrical protective clothing. 3.6 Remotely operated submersible
3.6.1 Pressure: Once fully submerged, its external pressure is the pressure of the surrounding water environment, ranging from 0 to 10MPa, usually 0 to 3MPa. The pressure it is subjected to will change rapidly when the submersible is launched or collected. 3.6.2 Environment: The equipment is completely immersed in seawater. 3.6.3 Temperature: The water temperature changes from 0~30℃. 3.6.4 Humidity: The external environment is seawater.
3.6.5 Diver's clothing: Wear rubber diving suit. 3.7 Umbilical cord
3.7.1 Pressure: Depends on the pressure at the depth of water reached, ranging from 0 to 5 MPa, but generally 0 to 2.5 MPa. 3.7.2 Environment: Atmosphere, splash mist or seawater. 3.7.3 Temperature: When immersed in seawater, the temperature is 0 to 30°C, and in special cases the temperature can be as low as 0°C or as high as 50°C. 3.7.4 Humidity: From the atmosphere (splash or immersion area) to seawater. 3.7.5 Diver's clothing: Wear rubber diving suit. 3.8 Portable equipment
3.8.1 Pressure: Depends on the pressure at the depth of water reached, ranging from 0 to 5 MPa, but generally 0 to 2.5 MPa. Rapid pressure changes 3.8.2 Environment: atmosphere, splashing mist or completely submerged in seawater, and can also enter 0.5MPa compressed air, or nitrogen-oxygen mixed gas environment with a pressure of 5MPa.
3.8.3 Temperature: submerged in seawater, the temperature is 0~30℃, but generally 5~15℃. 3.8.4 Humidity: from atmosphere (splashing or submerged area) to seawater. 3.8.5 Diver's clothing: wear rubber diving suit 3.9 Undersea equipment
3.9.1 Pressure: depends on the pressure at the depth of water, ranging from 0~5MPa, but generally 0~2.5MPa. 3.9.2 Environment: atmosphere, splashing mist or seawater. 3.9.3 Temperature: submerged in seawater, the temperature is 0~30℃, but generally 5~15℃. 3.9.4 Humidity: from atmosphere (splashing or submerged area) to swimming water. 3.9.5 Diver's clothing: Wear rubber diving suit. 3.10 Wet welding and cutting
3.10.1 Pressure: Depends on the pressure at the depth of the water, ranging from 0 to 5 MPa, but generally 02.5 MPa. 3.10.2 Environment: Atmosphere, splashing mist or seawater. 3.10.3 Temperature: Immersed in seawater, the temperature is 0~30C, but generally 5~15℃. 3.10.4 Humidity: From atmosphere (splashing or flooding area) to seawater. 3.10.5 Diver's clothing: Wear rubber diving suit, heavy diving suit, helmet covered with thin rubber or insulating film, and wear rubber gloves. 3.11 Impressed current device
3.11.1 Pressure, depends on the pressure at the depth of the water, ranging from 0 to 3 MPa. 350
3.11.2 Environment: Atmosphere, splashing mist or seawater. GB166361996
3.11.3 Temperature: When immersed in seawater, the temperature is 0~~30℃, but generally 5~15℃. 3.11.4 Humidity: From the atmosphere (splash or immersion zone) to seawater. 3.11.5 Diving suit: Wear a rubber diving suit. 3.12 High-power equipment
3.12.1 Pressure, depends on the pressure at the depth of the water, generally 0~3MPas3.12.2 Ambient atmosphere, splash mist or seawater. 3.12.3 Temperature: When immersed in seawater, the humidity is 0~~30℃, but generally 5~15C. 3.12.4 Humidity, from the atmosphere (splash or immersion zone) to swimming. 3.12.5 Diving suit: Wear a rubber diving suit. 3.13 Surface power distribution equipment
3.13.1 Pressure: Normal pressure environment
3.13.2 Environment: From dry, warm air indoor conditions to exposed ship decks (wind, rain, waves and disturbances). 3.13.3 Humidity: Depends on the intensity of the environment, generally in the range of 0~50℃. 3.13.4 Humidity: From dry atmosphere to seawater splash zone. 3.13.5 Diving clothing: General clothing or rubber diving suit. 3.14 Underwater blasting device
3.14.1 Pressure, depends on the pressure at the depth of the water, ranging from 0.5MPa, but generally in the range of 0~3MPa. 3.14.2 Environment: Atmosphere, splash mist or swimming water. 3.14.3 Temperature: When immersed in seawater, the temperature is 0~30°C, but generally 515°C. 3.14.4 Humidity: From the atmosphere (splash or submersion zone) to the seawater. 3.14.5 Diving suit: Wear a rubber diving suit. 3.15 Battery
3.15.7 Pressure: Pressure environment.
3.15.2 Environment: Completely sealed.
3.15.3 Temperature: Depends on the temperature of the environment, generally in the range of 0~50°C. 315.4 Condensation: Dry.
3.15.5 Diving suit: Ordinary clothing or rubber diving suit. 3.16 Insulation materials
3.16.1 Pressure between 0.5 MPa, but generally within the range of 0.2.5 MPa, can be induced at different rates 3.16, 2 Environment: from dry, warm indoor conditions to exposed ship decks (wind, waves, waves and vibration). 3.16.3 Temperature, depending on the temperature of the environment, generally in the range of 0~50℃. 3.16.4 Degrees, from dry atmosphere to seawater splash zone. 3.16.5 Diver's clothing: ordinary clothing or rubber diving suit. 4 Technical requirements
4.1 Deck decompression chamber (DDC) and emergency transfer system 4.1.1 The design, construction, installation and testing of electrical devices used in deck ballast tanks and emergency transfer systems shall comply with the relevant regulations of the current national ship inspection agency.
4.1.2 The power voltage of the deck decompression chamber and emergency transfer system must comply with the provisions of Table 1. 351
AC power with automatic trip device? ）
Direct current with automatic tripping device
Alternating current without automatic tripping device
Direct current without automatic tripping device
GB 16636---1996
Safety current for human body
Impedance of current path
1) Voltage (V)Safety current for human body (A)×Impedance of current path (Q). For the calculation of safety current for human body, please refer to Appendix A (Suggestive Appendix) of this standard.
2) This standard stipulates that the action response time of the automatic tripping device is <20ms. 4.1.3 The electrical system of the deck decompression chamber and the emergency transfer system shall not use its metal shell as a circuit, and a protective device with automatic tripping shall be provided in the circuit for overload and short circuit protection. 4.1.4 All metal parts of the deck decompression chamber and the emergency transfer system must be reliably grounded, and the grounding resistance value shall not be greater than 40. Each insulated power distribution system shall be equipped with a leakage detection or grounding circuit breaker alarm device, and the insulation resistance value shall not be less than 5MQ. 4.2 Diving bells and submersibles with locks
4.2.1 The design, construction, installation and testing of electrical devices used in diving bells and submersibles with locks shall comply with the relevant regulations of the current national ship inspection agency.
4.2.2 The power voltage used in diving bells and submersibles with locks must comply with the provisions given in Table 1. 4.2.3 The automatic trip devices used in diving bells and submersibles with locks shall be capable of being readjusted by the diving supervisor after the necessary safety inspection. At the same time, these devices shall also be equipped with overload protection devices that can be operated by the diving supervisor after readjustment. 4.3 Underwater working chambers
4.3.1 The design, construction, installation and testing of electrical devices used in underwater working chambers shall comply with the relevant regulations of the current national ship inspection agency.
4.3.2 The power voltage used in underwater working chambers must comply with the provisions given in Table 1. 4.3.3 The AC power supply used in the underwater work chamber, such as from an isolation transformer with no grounded secondary pole, should use a line insulation monitor with a circuit breaker.
4.3.4 The AC power supply used in the underwater work chamber, such as from an isolation transformer with secondary grounding, should use a protection device with automatic tripping and limit its fault current to less than 1A. 4.3.5 The automatic tripping device used in the underwater work chamber should be able to be readjusted by the diving supervisor after the necessary safety inspection. At the same time, these devices should also be equipped with overload protection devices that can be operated by the diving supervisor after readjustment. 4.4 Electric thermal diving suits
4.4.1 The resistance wire of the electric thermal diving suit must have a high fatigue strength and a reliable structure that is not easy to break. The insulating and conductive fabrics must be non-flammable and non-toxic materials.
4.4.2 The power voltage of the electric heating diving suit must comply with the provisions given in Table 2. 4.4.3 The helmet or gas heater of the electric heating diving suit shall be completely enclosed in a reliably grounded conductive shield. 352
Alternating current with automatic tripping device?
Direct current with automatic tripping device
Direct current without automatic tripping device
GB 16636-1996
Human body safety current
Current path impedance
Voltage 1
1) Voltage (V) = human body safety current (A) X current path impedance (0). For the calculation of human body safety current, refer to Appendix A of this standard. 2) This standard stipulates that the action response time of the automatic tripping device is ≤20ms. 4.5 Manned submersibles
4.5.1 The design, construction, installation and testing of electrical devices used in manned submersibles shall comply with the relevant regulations of the current national ship inspection agency.
4.5.2 The voltage of any electrical equipment in a manned submersible that may be touched by internal passengers or external divers must comply with the provisions of Table 1.
4.5.3 The AC power supply of a manned submersible should be supplied by an isolation transformer, and its electrical system should be equipped with a reliable grounding alarm device. 4.6 Remotely Operated Submersibles
4.6.1 The design, construction, installation and testing of electrical equipment used in remotely operated submersibles should comply with the relevant regulations of the current national ship inspection agency.
4.6.2 If the AC power supply used by the remotely operated submersible comes from an isolation transformer with no grounded secondary pole, a line insulation monitor with a circuit breaker should be used.
4.6.3 If the AC power supply used by the remotely operated submersible comes from an isolation transformer with secondary grounding, a protection device with automatic tripping should be used, and its fault current should be limited to less than 1A. 4.6.4 The automatic tripping device used by the remotely operated submersible should be able to be readjusted by the diving supervisor after necessary safety inspections. At the same time, these devices should also be equipped with overload protection devices that can be operated by diving supervision after readjustment. 4.7 Umbilical
4.7.1 The design, construction, installation and testing of electrical devices used in umbilicals should comply with the relevant regulations of the current national ship inspection agency. 4.7.2 The umbilical cable should have sufficient tensile strength and measures should be taken to prevent it from being subjected to tensile loads. 4.7.3 The voltage of electrical equipment outside the umbilical that may be touched by divers or relevant personnel must comply with the provisions given in Table 1. 4.7.4 The AC power supply used for the umbilical cable, such as from an isolation transformer with no grounded secondary, should use a line insulation monitor with a circuit breaker.
4.7.5 The AC power supply used for the umbilical cable, such as from an isolation transformer with secondary grounding, should use a protection device with automatic tripping and limit its fault current to less than 1A. 4.8 Portable equipment
4.8.1 Diver's portable equipment should be sturdy and durable. 4.8.2 The power voltage of the divers' portable equipment must comply with the provisions given in Table 1. 4.9 Submarine equipment
4.9.1 The AC power supply used for the subsea equipment, such as from an isolation transformer with no grounded secondary, should use a line insulation blue tester with a circuit breaker.
4.9.2 The AC power supply used for the subsea equipment, such as from an isolation transformer with secondary grounding, should use a protection device with automatic tripping and limit its fault current to less than 1A. 4.9.3 In any case, the conductive structure or frame of the subsea equipment should be reliably grounded. The resistance value of the grounding wire shall not exceed 4Qα and have sufficient mechanical strength. 353
4.10 Wet welding and cutting
GB 16636-1996
4.10.1 The power voltage of the wet welding and cutting equipment must comply with the provisions given in Table 3. 4.10.2 For wet welding and cutting, a DC welding machine shall be used, connected to the AC power supply through a rectifier. The grounding wire shall be securely and tightly connected to the welded (cut) piece, and the grounding resistance value shall not be greater than 4Ω. The welding or cutting equipment shall be placed on a ship or a surface platform. 4.10.3 The welding device for wet welding and cutting shall not have any open flame parts, that is, the power cable immersed in water shall be completely insulated, and the insulation resistance value shall not be less than 5MQ.
4.10.4 The welding cable shall consist of two completely insulated conductors with sufficient cross-section, and the cable length shall be kept as short as possible to limit loop induction while meeting the operational requirements and safety. All joints on the cable shall be completely insulated, and the cables shall not be arranged close together, but shall be bundled at intervals to reduce the inductance effect. The cables connected in parallel shall be arranged with the same lead and polarity diagonally in reverse phase to reduce the inductance effect.
4.10.5 The loop connection of the workpiece for wet welding and cutting shall be as close to the working area as possible. Table 3
Human body safety current
Direct current without automatic tripping device
Current path impedance
Voltage\
1) Voltage (V) = human body safety current (A) X current path impedance (Q). For the calculation of human body safety current, refer to Appendix A of this standard. 4.11 Impressed current device
4.11.1 An isolation fence and/or safety sign should be set at an appropriate distance from the impressed current device to prevent divers from mistakenly entering a potentially hazardous area. The calculation of the installation distance of the isolation fence and/or safety sign can refer to B1 in Appendix B (suggestive appendix) of this standard. 4.11.2 The power supply voltage of the impressed current device must comply with the provisions given in Table 3. 4.11.3 If the DC power supply voltage of the impressed current device is not greater than 30V, an isolation fence and safety sign may not be set. 4.12 High-power equipment
4.12.1 Isolation fences and/or safety signs should be installed at appropriate distances from high-power equipment to prevent divers from mistakenly entering potentially hazardous areas. The calculation of the installation distance of isolation fences and/or safety signs can refer to B1 in Appendix B of this standard. 4.12.2 If the AC power supply used by high-power equipment comes from an isolation transformer with no grounded secondary pole, a line insulation monitor with a circuit breaker should be used.
4.12.3 If the AC power supply used by high-power equipment comes from an isolation transformer with a grounded secondary pole, a protection device with automatic tripping should be used, and its fault current should be limited to less than 1A. 4.13 Surface power distribution equipment
4.13.1 The design, construction, installation and testing of surface power distribution equipment (surface support vessels or similar facilities) controlled by the diving team and serving divers' underwater operations shall comply with the relevant regulations of the current national ship inspection agency. 4.13.2 All power sources used for underwater operations should be electrically isolated from the ship or facility's power distribution system, such as by using an isolation transformer or an independent generator.
4.14 Underwater Blasting
4.14.1 This standard only covers underwater blasting explosives or devices that are detonated electrically. 4.14.2 The electrical detonators used for underwater blasting must be able to avoid interference from external radio frequency transmitting devices and not be accidentally detonated. 4.14.3 The danger of "stray current" in the construction environment causing the electric detonators to automatically detonate must be prevented. 4.15 Batteries
4.15.1 The design, selection, installation and testing of batteries related to divers' underwater operations should comply with the relevant regulations of the current national ship inspection agency.
4.15.2 Primary batteries (non-rechargeable type) should provide adequate short-circuit protection. 354
GB 16636-1996
4.15.3 Secondary batteries (rechargeable type) should be charged in a properly ventilated area on the water surface. If submersible charging facilities are required on fixed facilities, the charging voltage should be limited to a level not greater than the blistering voltage. 4.15.4 To prevent water from entering the battery space and the possible explosion or toxic gas mixture, the battery compartment should be completely watertight and necessary airtightness tests should be carried out.
4.15.5 The fuse should be as close to the battery as possible and fixed and sealed in the battery compartment to avoid burning the fuse due to ignition of hydrogen-containing gas that may exist in the compartment.
4.16 Insulating materials
4.16.1 Electrical insulating materials related to underwater operations of divers and that may come into contact with breathing gas circuits or general working equipment must be flame retardant or flame retardant, and have the lowest potential hazards of fire, explosion, electric shock, smoke and toxic gases emitted to personnel.
4.16.2 Electrical equipment with potential toxic hazards must be separated from spaces containing breathing gases to reduce possible toxic hazards. The amount of potentially toxic insulating materials can be reduced by limiting the amount of electrical equipment in the sealed space. And on the premise of meeting the electrical protection and cable length margin, select the thickness of the insulating material that minimizes the potential toxicity and shorten the cable length as much as possible. 4.16.3 For electrical components used inside cabins that come into contact with divers or breathing gas circuits, special sealed containers must be considered to withstand the working pressure and prevent any possible toxic diffusion. Wires and cables should have mechanical protection. At the same time, the hazards caused by high temperature and complete immersion in water, which may lead to toxic evaporation of insulating materials, should be considered. 4.16.4 The rated current, voltage and possible fault current should be selected so that their normal operating temperature is within the acceptable limit of the given insulating material.
A1 Basic Definitions
GB 16636-1996
Appendix A
(Suggestive Appendix)
Human Safety Current
The "Human Safety Current" in this standard refers to the maximum safe current that can be allowed to flow through the diver's body, which is different from the fault current of underwater electrical equipment.
Electric shock current
A2.1 Perception threshold Icz
Icz(50/60Hz AC)=0.5mA
Icz(DC)=2 mA
A2.2 Escape threshold TBT
Igr(f<50 Hz AC)=9+3110-0.07 mAIBr(50 Hz AC）9mA
Ir(f>50Hz AC)8.9+10-3·f.logfmAIB(DC)=40mA
A2.3 Maximum electric shock current IAc(AC), Ic(DC)A2.3.1 Electric shock duration t: 3.5ms
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