GB/T 13029.1-1991 Selection and laying of cables for low voltage power systems on ships
Some standard content:
UDC 621. 315
National Standard of the People's Republic of China
GB/T 13029. 1~13029. 3--91
Choice and installation of cables in ships
Issued on July 15, 1991
State Administration of Technical Supervision
Implementation on April 1, 1992
W.National Standard of the People's Republic of China
Choice and installation of cables for low-voltage power systems in shipsGB/T 13029.1—91
This standard adopts the international standard IEC.92-3524 Selection and installation of cables for low-voltage power systems 3 (1979 and its Amendment No. 1 of 1987).
1 Topic content and scope of application
This standard specifies the basic requirements for the selection and installation of relays in low-voltage power systems of 1kV and below on ships. This standard is applicable to steel ships (excluding oil tankers) and is not applicable to special requirements of other types. 2 Reference standards
B9%31.1 General provisions for power cables and wires for ships with rated voltages of 0.6/1kV and below
GB10250
Electromagnetic compatibility of electrical and electronic equipment in ships Part I Selection of cables
3 Selection of insulation
3.1 The rated voltage of the cable should not be lower than the nominal voltage of the circuit using the cable. Special considerations should be made for relays used in high-inductance circuits such as winches operated by contactors.
3.2 The long-term allowable operating temperature of the cable insulation material should be at least 10℃ higher than the highest ambient temperature that may exist or be generated in the cable installation location. The name of the insulation material, the long-term allowable operating temperature and the short-circuit temperature are shown in Table 1. Table 1
Insulating materials
Natural-styrene-butadiene rubber
Thermosetting
Thermoplastic
Other materials
Acrylic rubber
Cross-linked polyethylene
Silicone rubber
Aoyicheng (general)
Polyethylene (thermoplastic)
Conductor long-term maximum allowable operating temperature
Conductor short-circuit temperature
Note: (I) Conductor temperature is the sum of the temperature rise caused by the ambient temperature and the load. The long-term, maximum allowable operating temperature of the conductor is the long-term allowable operating temperature of the insulating material.
Natural-styrene-butadiene rubber insulated cable is generally used for non-human ships. Approved by the State Technical Supervision Bureau on July 15, 1991 and implemented on April 1, 1992
W.bzsoso:com Choice of protective layer
G/T 13029.1--91
4.1. Cables fixedly installed on exposed decks, damp places (such as bathrooms), cargo holds, cold places, engine rooms and places where condensed water or harmful gases (such as oil vapor) are usually present shall have sealing protection. Note: Although polyethylene, sulfonated ethylene and rubber are not suitable for long-term immersion in the body, they can be used as materials for the above-mentioned sealing protection. 4.2 When selecting the protective layer, the mechanical effects that the cable may be subjected to during installation and use shall be considered. If the mechanical strength of the cable protective layer is not enough, it should be installed in a pipe, duct (relay) or other protection measures shall be taken (Chapter 18). 4.3 In AC system For the selection of protective layer for single-core cable, please refer to Chapter 29. 5 Requirements for fire retardant characteristics of cables
5.1 The cable shall have D-type or S-type flame retardant characteristics as specified in GB9331.1. 5.2 When cables with fire-resistant characteristics are required, N-type fire-resistant cables as specified in GB9331.1 shall be used. 6 Determination of conductor cross-sectional area
The consideration of the cross-sectional area of each conductor shall meet the following conditions. 1.1 The current carrying capacity of each conductor after correction shall not be less than the maximum continuous load that the conductor may be subjected to in the circuit. The corrected current carrying capacity is the continuous working current carrying capacity of the cable listed in Table 3 of Chapter 7 multiplied by the relevant correction factor (see Table 8 and 9 of Chapter 8). Chapter, Chapter 10).
The maximum continuous load that the cable may pass should be calculated based on the characteristics of the circuit and motor powered by the cable and the simultaneous working coefficient. 6.2 When the cable passes the maximum current, the line voltage drop should not exceed the limit specified for the relevant line (see Chapter 11). 6.3 After determining the cross-sectional area by the above calculation, taking into account the temperature rise caused by short circuit (see Chapter 15) and motor starting current (see Chapter 10), the conductor cross-sectional area should also be checked. 6.4 Under laying and working conditions, the conductor should have sufficient mechanical strength. The minimum area of the power cable conductor is 1mm. 6.5 The cross-sectional area of the grounding conductor of electrical equipment is shown in Table 2. Table 2
Grounding conductor type
Grounding conductor in weekly fixed cable
Grounding conductor with a separate fixed number
7 Current carrying capacity of continuous working system
Related current-carrying conductor cross-sectional area
2. 5 S 120
Minimum area of copper pool conductor
$= 421. 5
≥ and 0216
For multiple copper wire flexible cords
For single copper wire
=Q≥4
7.1 The continuous working system of the cable means that the time of current carrying (constant load) is greater than 3 times of the heating time constant of the cable and greater than the critical continuous time (see Figure 1).
W.204
GB/T 13029.1 -91
Critical duration = 3T
22533157816
[S2025 3035404550 61 7(8) 9010 Electrical outer diameter n
Figure 1 Cable time band number
7.2 The continuous duty current carrying capacity of cables of various insulating materials is shown in Tables 3 to 7. The type of protective layer (whether armored or not) may be ignored when selecting these current carrying capacities.
Table 3 Long-term allowable operating temperature of conductor 60℃
PVC (general) insulated cable current carrying capacity (ambient temperature 45℃) Core teaching
Cross-sectional area.mm
Cross-sectional area.mn:
Cross-sectional area, A
W.bzsoso:comNumber of cores
Cross-sectional area.mm
Cross-sectional area, mm*
Cross-sectional area.mm*
GB/T 13029.191
Table 4 Conductor long-term allowable working temperature 75℃
PVC (heat-resistant) insulated cable current carrying capacity (ambient temperature 45℃) No. 8 4
Carrying capacity, A
Cross-sectional area, mm
Conductor long-term allowable working temperature 70℃
Natural-styrene-butadiene rubber insulated cable current carrying capacity (ambient temperature 45℃) 2
Flow rate, A||tt ||Cross-sectional area, mm
Conductor long-term allowable working temperature 85℃
Comparative current, A
Current carrying capacity, A
Current carrying capacity of acrylic rubber or cross-linked polyethylene insulated cable (ambient temperature 45℃) 3 or 4.
Cross-sectional area, mm
Current carrying plate, A
Number of cores
Cross-sectional area, mm
GB/T 13029. 191
Conductor long-term allowable working temperature 95℃
Silicone rubber or mineral insulated cable current carrying capacity (ambient temperature 45C)2
Current carrying capacity
Cross-sectional area, mm
Current carrying capacity, A
Note: ① The current carrying capacity listed in Tables 3 to 7 is the calculated value when the ambient temperature is 45℃, when four cables are bundled and placed in free air, and the conductor temperature reaches the long-term allowable working temperature of the insulation and is continuously maintained at this temperature. 2 The current carrying capacity of 2, 3 and 4 core relays is calculated using the current carrying capacity of single core cable with the following coefficients. 2 core cable: 0.85
3 core and 4 core cable: 0.70
@ When the mineral insulated cable is installed in a position where the copper sheath is easily touched by human body, the current carrying capacity listed in the table should be multiplied by the coefficient, 0.7, so that the temperature of the thin sheath does not exceed 70℃.
7.3 When the number of cable cores exceeds four (such as control cables), the current carrying capacity of single-core cables in Tables 3 to 7 should generally be increased by the coefficients listed in Table 8. Table 8
25-~42
Note: Taking into account the simultaneous working coefficient, the above coefficients can be appropriately relaxed. 8 Correction coefficients for different ambient temperatures
The current carrying capacity listed in Tables 3 to 7 is based on an ambient temperature of 45°C. This is applicable to any ship sailing under any climatic conditions. However, considering that the ambient temperature of special-purpose ships (such as coastal ships, ferries and port ships, etc.) is often lower than 45°C, the current carrying capacity listed in Tables 3 to 7 can be increased (but the ambient temperature must not be lower than 35°C). When it is expected that the air temperature around the cable is higher than 45°C (for example, when the cable metal part or part passes through a high-temperature space or cabin), the current carrying capacity listed in Tables 3 to 7 should be reduced.
The correction coefficients for different ambient air temperatures are shown in Table 9. Table 9 Correction coefficients for different ambient air temperatures Conductor long-term allowable
Working temperature,
Different ambient air temperature +
W.bzsoso: com Conductor long-term allowable
Working humidity, core
9 Correction coefficients for bundled cables
GB/T13029:1-91
Continued Table 9
Different ambient air temperature,
The current carrying capacity of cables laid in bundles on guide plates, pipes, ducts or relays generally does not need to be corrected, and the current carrying capacity bases listed in Tables 3 to 7 can be directly used. However, when more than six cables work at rated load at the same time (generally belonging to the same circuit), and the ears are closely laid together in bundles so that there is no free circulation of air around the relay, the correction coefficient of 0.85 should be applied. The number of laying layers generally does not exceed two layers or the height does not exceed 50mm.
10 Correction coefficient for non-continuous working system
10.10.5 or 1h working system The corresponding correction coefficient given in Figure 2 can be used to correct the current carrying capacity of cables. However, the correction coefficient given in Figure 2 is only applicable when the working time exceeds the critical duration given in Figure 1 (the critical duration is equal to 3 times the cable time constant).
method, the correction factor given in Figure 2 is an approximate value, which mainly depends on the cable diameter. Usually, the 0.5h working system is suitable for vehicles and anchor machines. 102 The correction coefficient given in Figure 3 can be used to correct the current carrying capacity of cables in repeated short-time working systems. Note: The correction coefficient given in the figure is calculated based on a period of 10 minutes, of which 1 minute is subjected to the fixed load and 6 minutes is idle. W.2.2
GB/T 13029. 191
Correction coefficient =
Number of trips in one time, width,
,-working time
t,=uoh
electrical voltage,mm
Figure 20.Correction coefficient for 5h and 1h working system
W.11 Voltage drop
GB/T 13029.1-91
:expf-
Time receipt to period 10 yuan 1n
Same song than things 40%
Outer diameter of cable, mm
Figure 3-Correction coefficient of working system
When the cable passes the maximum current under normal working conditions, the voltage drop from the main switchboard or emergency switchboard to any point in the system should not exceed 6% of the rated voltage. When powered by a battery with a voltage not exceeding 50V: the voltage drop can be increased to 10%. The voltage drop of the navigation light line should be limited to a small value to maintain its sufficient brightness and color. These values are applicable to normal and stable conditions. Under short-term special conditions (such as motor starting), a larger voltage drop is allowed, as long as the equipment can withstand the influence of these larger voltage drops. .12 Estimation of lighting load
When estimating the rated current of the lighting point to determine the cable cross-sectional area, the current of each lamp head is equivalent to the maximum load that may be connected and is at least 6DW. Unless the structure of the lamp can only accommodate a small F60W bulb, the rated current can be estimated accordingly. Each lighting socket is calculated as two lighting points.
13 Parallel use of cables
If all cables used in parallel have the same cross-sectional area, length, impedance and conductor long-term allowable operating temperature, their current carrying capacity is the sum of the current carrying capacity of all parallel conductors. Generally, conductors with smaller cross-sectional areas should not be used in parallel as much as possible. 14 Independent circuits
All circuits that require independent short-circuit protection or over-current protection, except for the circuits described in items a and b below, should each use a separate cable.
If the main circuit and the control circuit use a common isolating switch, the control circuit derived from the main circuit (such as the motor circuit) can share the same cable with the main circuit.
h Non-critical circuits whose voltage does not exceed the safe voltage. 15 Short-circuit capacity
Cables and their insulated cores should be able to withstand the maximum short-circuit current flowing through any part of the circuit in which they are located [mechanical and thermal effects caused by W.GB/T13029.91
should not only consider the time/current characteristics of the circuit protection device, but also the expected short-circuit current peak value during the first period. The short-circuit capacity of the cable can refer to A. To calculate the cable reactance required for the short-circuit current of the circuit, please refer to Appendix B, Part II Cable Design
16 Cable routing
16.7 The cable routing should be as straight as possible and easy to repair. 16.2 The cable routing should avoid condensation or dripping and the influence of water. 16.3 The cable routing should be away from heat sources such as boilers, heat sinks and resistors. If the location of the cable cannot avoid the heat source, and the relay is in danger of being heated, appropriate protection should be installed or other measures should be taken to avoid overheating, such as using special windproof equipment, installing insulation materials or using special heat-resistant cables. 16.4 The structure of the cable routing should be considered to prevent the invasion of rats or other harmful animals. 16.5 The cable should not cross the expansion joint of the hull. If it is unavoidable, the cable should be bent into a circular expansion elbow, the length of which is proportional to the extension length of the joint. The minimum average diameter of the expansion elbow is not less than 12 times the outer diameter of the relay. 16.6 Insulated cables with different conductors with different long-term allowable working temperatures should not be laid together in bundles. If such laying is unavoidable, the working temperature of any cable in the cable bundle should not exceed the temperature allowed by the cable with the lowest temperature rating in the bundle. 16.7 When the protective layer of one cable may damage the protective layer of another relatively weak cable, these relays cannot be laid together in a bundle. 16.8 Cables with metal sheaths or metal shields should be protected from galvanic corrosion caused by contact with other metals in the equipment. 16.9 Cables are strictly prohibited from passing through oil tanks. Cables should not generally pass through water tanks. If it cannot be avoided, they should pass through metal shields. 16.10 For important electrical equipment with at least two power supplies, such as engine room transmission equipment, their power supplies and related control cables should be routed separately and as far away from the equipment as possible in the vertical and horizontal directions. For important electrical equipment with two power supplies, their power supplies and any related control cables should be routed separately and as far away from the equipment as possible in the vertical and horizontal directions.
Note: For systems with important functions that can be used as backup for each other, such as engine room command and re-driving control systems, their connections should be handled in this way. Where the main switchboard is installed in an independent and enclosed compartment, such as a control room, this provision shall not apply to the equipment and cables installed in these compartments:
16.11 Where the ship is to be divided into several fire zones (e.g. on passenger ships), the emergency feeder cables passing through any fire zone should be arranged as far away from the main fire zone as possible in the vertical direction so that in the event of a fire in any main fire zone, the power supply to important equipment in other fire zones will not be affected.
16.12 The cables for important or critical power, lighting and communication equipment should be routed as far as possible away from fire rooms, laundry rooms, engine rooms or machinery spaces and in areas with greater fire hazards, except for cables supplying equipment in these spaces. If possible, the cables should be routed so as to avoid damage to the cables by heating the bulkheads before a fire breaks out in the adjacent sheltered spaces. In order to prevent damage to the cables by fire, special attention should be paid to protecting the main cables of important lines between the engine room and the isolated compartments. This takes into account the risk of fire in living quarters. When the circuit must continue to work for a period of time during a fire and the cable must inevitably pass through an area with a high risk of fire, the cable should be of a type that can pass the test specified in the appendix of GB9331.1, or be properly protected to prevent the cable from being directly exposed to fire (oxygen emergency fire protection circuits and related systems). The power and control cables of the main cables and important equipment should be routed away from machines, machine parts or equipment with a greater risk of fire. Unless:
, the wires must be connected to equipment that is connected to these machines: h. The cable main steel cabin or printed board protection; c. The N-type fire-resistant system that complies with GB9331.1 is used in this area. 9
W.Note: () 1. Cable routing as follows:
GB/T 13029.191
. The wiring of the central machine and relay to the emergency distribution and recovery of the insect correction machine: b. The wiring of the upper switchboard or emergency switchboard, the central control panel of the automatic control device, the zone switchboard or the important medium material, the wiring of the control panel on the side or below
2; The machine, machine parts or equipment that handles flammable items can be considered as having a greater risk of fire. 18.73 The penetration of the cable should maintain the integrity of the cabin fire protection 1B.74 The layout of the cable routing should also prevent the spread of flames as much as possible. When using D-type cables, the following measures should be taken: 1B.14.1 For cables routed vertically in F-clothed or semi-closed spaces, fire prevention measures should be set at the following locations. . Fire-stopping measures shall be provided on at least one deck of each vehicle, and the maximum distance between them shall not exceed 6m. Unless the cables are laid in a fully enclosed cable skirt, fire-stopping measures shall be provided on the main switchboard and auxiliary switchboard, at the place where the cables enter the machine control room, at the control panel of the propulsion machinery and important auxiliary machinery ... m.
16.14.3 Fire-stopping measures arranged in accordance with the provisions of 16.14.1 and 16.14.2 shall be set as follows: For vertical cables in non-fully enclosed cable ducts, a steel plate with a thickness of at least 3 mm shall be used as a cover for the cable. The gaps in the entire cross-section a
or the entire length of the cable duct shall be coated with approved fire-retardant paint. b. For open vertical cables, panels shall be installed in accordance with the provisions of a. The extension of the cables around the baffles shall be twice the maximum size of the cable bundle. However, the extension does not need to exceed the bulkhead or solid relay wall, or the entire length of the cable bundle shall be coated with approved fire-retardant paint. Approved fire retardant coatings. For cables with micro-openings and horizontal wiring, baffles shall be installed in accordance with the provisions of the regulations. The size of the baffles extending around the cables shall be twice the maximum size of the cable bundle, but shall not exceed the ceiling, deck, bulkhead and solid wall; or approved fire retardant coatings shall be used on the cable bundle for at least 1㎡ in length. Note: When cables are protected with fire retardant coatings, the possible impact of the humidity on the working environment of the cables shall be considered. 16.14.4 In cargo holds and loading areas or underdeck passages, fire extinguishing measures shall be set up along the boundaries of these places. 17. Cable number design method for electromagnetic interference is to avoid electromagnetic interference as much as possible. The influence of magnetic interference should be paid special attention to the provisions of GB10230. These provisions are particularly important for cables laid near radio equipment and cables of sensitive control systems and monitoring systems under the kitchen. 18 Mechanical protection
18.1 In places where there may be danger of mechanical damage, the relay should be enclosed with appropriate pipes or covers, unless the cable sheath has sufficient toughness protection (engraved armor).
18.2 In places where there is a great risk of mechanical damage, such as under the bottom steel plate, in the yard and cargo hold, etc., steel covers, relay troughs or arm channels should be used for protection, that is, The cable shall be armored, even if the hull or accessory structure does not provide adequate protection for the cable. 18.3 Metal casings used for mechanical protection of cables shall be effectively shielded. 19 Grounding of Cable Metal Sheath and Mechanical Protection 19.1 All metal sheaths of cables shall be grounded at both ends to the metal hull, but for the exceptions specified in Article 29.1, for the branch circuit (grounded at the power supply end) and other equipment (control and measuring instrument cables, mineral insulated cables, intrinsically safe circuits and control circuits, etc.), single-point grounding may be used if there is a technical and safety need. 19.2 The metal sheath of the cable shall be connected with a conductor whose cross section is related to the rated current of the cable (see Table 10). It may also be connected with an equivalent method, such as clamping the metal sheath of the cable with a metal transformer and then connecting it to the metal hull structure. If the design of the stuffing box can ensure that the cable metal sheath can be connected to the metal hull structure, the metal sheath of the cable can also be grounded through the stuffing box.
Cross-sectional area of current-carrying conductor
Cross-sectional area of grounding conductor
19.3 The metal sheath of the cable should have air continuity throughout its length, especially at joints and taps. 19.4 Metal cable shields, pipes and cable troughs should be reliably grounded. 20 Cable bending radius
The minimum inner bending radius of the cable should be selected according to the different models recommended by the manufacturer, and should not be less than the values listed in Table II.
Table Cable Bending Radius
Cable Structure
Protective Layer
Metal Sheath, Sheath
Thermoplastic Elastomer
21 Cable Fixation
Other Sheath
Metal Sheath
Cable Outer Diameter D
Good Value
Any Value
General Inner Radius
21.1 Cables, except those used in portable equipment and laid in pipes, ducts, relay troughs or shields, shall be effectively fastened with clips or tie straps. The clips and tie straps shall be made of suitable flame-retardant materials and have a large enough area and a certain shape so that the cable can remain fastened without damaging its sheath.
21.2 The distance between adjacent fasteners shall be appropriately selected according to the relay type and vibration resistance, but shall not exceed 10 crm. For water-borne relays, if guide plates, separate brackets or assembled brackets are used, the distance between the fixing feet may be as long as 40 m1.
21.3 The materials of the fasteners and corresponding accessories shall be strong and corrosion-resistant, or shall be appropriately treated with anti-corrosion before installation. 21.4 Cable clips or tie bands made of non-metallic materials (such as polyamide, polyethylene, etc.) may be used. 21.5 When the cable is fastened with the clips or tie bands specified in Article 21.4, and the cable is not laid on the horizontal guide plate or bracket, appropriate metal cable clips or tie bands shall be added at a certain distance (such as 1 to 2m) to prevent the cable from loosening in the event of fire. This rule also applies to the fixing of non-metallic cable ducts.
22 Cables passing through bulkheads and decks
22.1 When the cable passes through the watertight bulkhead or the middle plate, a single stuffing box or a bundled stuffing box can be used and filled with flame-retardant material. If other types of cables are not used, the stuffing box or stuffing box and the packing assembly shall meet the requirements of the stuffing box watertight test. Note: The stuffing should be carefully selected to avoid adverse effects on the cable performance (such as high temperature generated by the compound used for the seeding, chemical reactions, and local cable overheating due to poor thermal conductivity of the material).
22.2 When the cable passes through non-watertight bulkheads or structural members, the opening must be equipped with a cable frame or a bushing of any appropriate material. The material selected for the stuffing or bushing should not be corrosive and should not damage the cable or hull structure. !
W.The plate should be installed according to the provisions of Article a, and the extension of the cable around the baffle is twice the maximum size of the cable bundle. However, the extension does not need to exceed the bulkhead or solid electrical wall, or the approved fire retardant paint should be applied to the entire length of the cable bundle. For the card micro-open horizontal wiring cable, the baffle should be installed according to the provisions of Article 1, and the extension of the cable around the baffle is twice the maximum size of the cable bundle, but it does not exceed the ceiling, deck, bulkhead and solid electrical wall; or the approved fire retardant paint should be applied to the cable bundle for at least 1㎡. Note that when the cable is protected by fire retardant paint, the possible impact of the humidity on the working humidity of the cable should be considered. 16.14.4 In the cargo hold and the cargo area or the underdeck passage, fire extinguishing measures should be set along the boundaries of these places. 17 Cable number design method for electromagnetic interference is to avoid the influence of electromagnetic interference as much as possible, and special attention should be paid to the provisions of GB10230. These provisions are particularly important for cables laid near radio equipment and cables for sensitive control systems and monitoring systems under shipboard. 18 Mechanical protection
18.1 In places where there may be danger of mechanical damage, the relays shall be enclosed in appropriate pipes or casings, unless the cable sheath has sufficient toughness protection (engraved armor).
18.2 In places where there is a high risk of mechanical damage, such as under the bottom steel plate, in the yard and cargo hold, etc., steel casings, relay troughs or arm ducts shall be used for protection, even if the cable is armored, unless the hull or auxiliary structures do not provide adequate protection for the cable. 18.3 Metal casings used for mechanical protection of cables shall be effectively protected from lightning. 19 Grounding of Cable Metal Sheath and Mechanical Protection 19.1 All metal sheaths of cables shall be grounded at both ends to the metal hull. However, for the branch circuits (grounded at the power supply end) and other equipment (control and measuring instrument cables, mineral insulated cables, intrinsically safe circuits and control circuits, etc.), single-point grounding may be used if there is a technical and safety need, except for those specified in Article 29. 19.2 The metal sheath of the cable shall be grounded using a conductor whose cross section is related to the rated current of the cable (see Table 10). It may also be grounded using an equivalent method, such as clamping the metal sheath of the cable with a metal transformer and then connecting it to the metal hull structure. If the design of the stuffing box can ensure that the metal sheath of the cable can be grounded to the metal hull structure, the metal sheath of the cable may also be grounded through the stuffing box.
Cross-sectional area of current-carrying conductor
Cross-sectional area of grounding conductor
19.3 The metal sheath of the cable should have air continuity in its length, especially at joints and taps. 19.4 Metal cable shields, pipes and cable troughs should be reliably grounded. 20 Cable bending radius
The minimum inner bending radius of the cable should be selected according to the different types recommended by the manufacturer and should not be less than the values listed in Table II.
Table Cable Bending Radius
Cable Structure
Protective Layer
Metal Sheath, Sheath
Thermoplastic Elastomer
21 Cable Fixation
Other Sheath
Metal Sheath
Cable Outer Diameter D
Good Value
Any Value
General Inner Radius
21.1 Cables, except those used in portable equipment and laid in pipes, ducts, relay troughs or shields, shall be effectively fastened with clips or tie straps. The clips and tie straps shall be made of suitable flame-retardant materials and have a large enough area and a certain shape so that the cable can remain fastened without damaging its sheath.
21.2 The distance between adjacent fasteners shall be appropriately selected according to the relay type and vibration resistance, but shall not exceed 10 crm. For water-borne relays, if guide plates, separate brackets or assembled brackets are used, the distance between the fixing feet may be as long as 40 m1.
21.3 The materials of the fasteners and corresponding accessories shall be strong and corrosion-resistant, or shall be appropriately treated with anti-corrosion before installation. 21.4 Cable clips or tie bands made of non-metallic materials (such as polyamide, polyethylene, etc.) may be used. 21.5 When the cable is fastened with the clips or tie bands specified in Article 21.4, and the cable is not laid on the horizontal guide plate or bracket, appropriate metal cable clips or tie bands shall be added at a certain distance (such as 1 to 2m) to prevent the cable from loosening in the event of fire. This rule also applies to the fixing of non-metallic cable ducts.
22 Cables passing through bulkheads and decks
22.1 When the cable passes through the watertight bulkhead or the middle plate, a single stuffing box or a bundled stuffing box can be used and filled with flame-retardant material. If other types of cables are not used, the stuffing box or stuffing box and the packing assembly shall meet the requirements of the stuffing box watertight test. Note: The stuffing should be carefully selected to avoid adverse effects on the cable performance (such as high temperature generated by the compound used for the seeding, chemical reactions, and local cable overheating due to poor thermal conductivity of the material).
22.2 When the cable passes through non-watertight bulkheads or structural members, the opening must be equipped with a cable frame or a bushing of any appropriate material. The material selected for the stuffing or bushing should not be corrosive and should not damage the cable or hull structure. ! bZxz.net
W.The plate should be installed according to the provisions of Article a, and the extension of the cable around the baffle is twice the maximum size of the cable bundle. However, the extension does not need to exceed the bulkhead or solid electrical wall, or the approved fire retardant paint should be applied to the entire length of the cable bundle. For the card micro-open horizontal wiring cable, the baffle should be installed according to the provisions of Article 1, and the extension of the cable around the baffle is twice the maximum size of the cable bundle, but it does not exceed the ceiling, deck, bulkhead and solid electrical wall; or the approved fire retardant paint should be applied to the cable bundle for at least 1㎡. Note that when the cable is protected by fire retardant paint, the possible impact of the humidity on the working humidity of the cable should be considered. 16.14.4 In the cargo hold and the cargo area or the underdeck passage, fire extinguishing measures should be set along the boundaries of these places. 17 Cable number design method for electromagnetic interference is to avoid the influence of electromagnetic interference as much as possible, and special attention should be paid to the provisions of GB10230. These provisions are particularly important for cables laid near radio equipment and cables for sensitive control systems and monitoring systems under shipboard. 18 Mechanical protection
18.1 In places where there may be danger of mechanical damage, the relays shall be enclosed in appropriate pipes or casings, unless the cable sheath has sufficient toughness protection (engraved armor).
18.2 In places where there is a high risk of mechanical damage, such as under the bottom steel plate, in the yard and cargo hold, etc., steel casings, relay troughs or arm ducts shall be used for protection, even if the cable is armored, unless the hull or auxiliary structures do not provide adequate protection for the cable. 18.3 Metal casings used for mechanical protection of cables shall be effectively protected from lightning. 19 Grounding of Cable Metal Sheath and Mechanical Protection 19.1 All metal sheaths of cables shall be grounded at both ends to the metal hull. However, for the branch circuits (grounded at the power supply end) and other equipment (control and measuring instrument cables, mineral insulated cables, intrinsically safe circuits and control circuits, etc.), single-point grounding may be used if there is a technical and safety need, except for those specified in Article 29. 19.2 The metal sheath of the cable shall be grounded using a conductor whose cross section is related to the rated current of the cable (see Table 10). It may also be grounded using an equivalent method, such as clamping the metal sheath of the cable with a metal transformer and then connecting it to the metal hull structure. If the design of the stuffing box can ensure that the metal sheath of the cable can be grounded to the metal hull structure, the metal sheath of the cable may also be grounded through the stuffing box.
Cross-sectional area of current-carrying conductor
Cross-sectional area of grounding conductor
19.3 The metal sheath of the cable should have air continuity in its length, especially at joints and taps. 19.4 Metal cable shields, pipes and cable troughs should be reliably grounded. 20 Cable bending radius
The minimum inner bending radius of the cable should be selected according to the different types recommended by the manufacturer and should not be less than the values listed in Table II.
Table Cable Bending Radius
Cable Structure
Protective Layer
Metal Sheath, Sheath
Thermoplastic Elastomer
21 Cable Fixation
Other Sheath
Metal Sheath
Cable Outer Diameter D
Good Value
Any Value
General Inner Radius
21.1 Cables, except those used in portable equipment and laid in pipes, ducts, relay troughs or shields, shall be effectively fastened with clips or tie straps. The clips and tie straps shall be made of suitable flame-retardant materials and have a large enough area and a certain shape so that the cable can remain fastened without damaging its sheath.
21.2 The distance between adjacent fasteners shall be appropriately selected according to the relay type and vibration resistance, but shall not exceed 10 crm. For water-borne relays, if guide plates, separate brackets or assembled brackets are used, the distance between the fixing feet may be as long as 40 m1.
21.3 The materials of the fasteners and corresponding accessories shall be strong and corrosion-resistant, or shall be appropriately treated with anti-corrosion before installation. 21.4 Cable clips or tie bands made of non-metallic materials (such as polyamide, polyethylene, etc.) may be used. 21.5 When the cable is fastened with the clips or tie bands specified in Article 21.4, and the cable is not laid on the horizontal guide plate or bracket, appropriate metal cable clips or tie bands shall be added at a certain distance (such as 1 to 2m) to prevent the cable from loosening in the event of fire. This rule also applies to the fixing of non-metallic cable ducts.
22 Cables passing through bulkheads and decks
22.1 When the cable passes through the watertight bulkhead or the middle plate, a single stuffing box or a bundled stuffing box can be used and filled with flame-retardant material. If other types of cables are not used, the stuffing box or stuffing box and the packing assembly shall meet the requirements of the stuffing box watertight test. Note: The stuffing should be carefully selected to avoid adverse effects on the cable performance (such as high temperature generated by the compound used for the seeding, chemical reactions, and local cable overheating due to poor thermal conductivity of the material).
22.2 When the cable passes through non-watertight bulkheads or structural members, the opening must be equipped with a cable frame or a bushing of any appropriate material. The material selected for the stuffing or bushing should not be corrosive and should not damage the cable or hull structure. !
W.The distance between the fixing feet can be up to cm.
21.3 The materials of the fasteners and corresponding accessories should be strong and corrosion-resistant, or they should be properly treated with anti-corrosion before installation. 21.4 Cable clips or ties made of non-metallic materials (such as polyamide, polyethylene, etc.) can be used. 21.5 When the cable is fastened with the clips or ties specified in Article 21.4, and the cable is not laid on the horizontal guide plate or bracket, appropriate metal cable clips or ties should be added at a certain distance (such as 1 to 2m) to prevent the cable from loosening in the event of fire. This rule is also applicable to the fixing of non-metallic cable ducts.
22 Cables passing through bulkheads and decks
22.1 When the cable passes through the watertight bulkhead or the middle plate, a single stuffing box or a bundled stuffing box can be used and filled with flame retardant material. If other types of cables are used, the stuffing box or the assembly of the stuffing box and the stuffing should meet the requirements of the stuffing box watertight test. Note: Filling materials should be carefully selected to avoid adverse effects on cable performance (e.g. high temperatures, chemical reactions and poor thermal conductivity of materials resulting from overheating of cables).
22.2 When cables pass through non-watertight bulkheads or structural members, the openings must be equipped with cable frames or bushings of any suitable material. The materials selected for filling materials or bushings should not be corrosive and should not damage cables or hull structural materials.
W.The distance between the fixing feet can be up to cm.
21.3 The materials of the fasteners and corresponding accessories should be strong and corrosion-resistant, or they should be properly treated with anti-corrosion before installation. 21.4 Cable clips or ties made of non-metallic materials (such as polyamide, polyethylene, etc.) can be used. 21.5 When the cable is fastened with the clips or ties specified in Article 21.4, and the cable is not laid on the horizontal guide plate or bracket, appropriate metal cable clips or ties should be added at a certain distance (such as 1 to 2m) to prevent the cable from loosening in the event of fire. This rule is also applicable to the fixing of non-metallic cable ducts.
22 Cables passing through bulkheads and decks
22.1 When the cable passes through the watertight bulkhead or the middle plate, a single stuffing box or a bundled stuffing box can be used and filled with flame retardant material. If other types of cables are used, the stuffing box or the assembly of the stuffing box and the stuffing should meet the requirements of the stuffing box watertight test. Note: Filling materials should be carefully selected to avoid adverse effects on cable performance (e.g. high temperatures, chemical reactions and poor thermal conductivity of materials resulting from overheating of cables).
22.2 When cables pass through non-watertight bulkheads or structural members, the openings must be equipped with cable frames or bushings of any suitable material. The materials selected for filling materials or bushings should not be corrosive and should not damage cables or hull structural materials.
W.
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