GB/T 2952.3-1989 Cable outer sheath Part 3: General outer sheath of non-metallic sheathed cables
Some standard content:
National Standard of the People's Republic of China
Cable sheaths General sheaths for non-metallic cables Protcctive coverings for electric cables General protcctive caverings for cables with non-mctallie sheath GB 2952.3—89
Substitute GB2952--82
This standard refers to the international electrotechnical standard IEC502 "Extruded solid insulated power cables with rated voltages of 1~30kV" (1983 edition).
1 Subject content and scope of application
This standard specifies the model, name, structure, size, technical requirements and inspection rules for the common outer sheath of non-metallic sheathed cables. This standard is applicable to the outer sheath of power, communication, signal and control cables with non-metallic sheaths and fixed laying methods. The non-metallic sheath can be extruded, such as a material sheath, or it can be wrapped. The technical standard does not apply to the outer sheath of cables with other special requirements. 2 Model and name
2.1 Model and name of outer sheath for non-metallic sheathed cables The name and main installation location shall comply with the provisions of Table 1. Table 1
Interlocking steel belt armored polyvinyl chloride jacket
Steel belt armored polyvinyl chloride jacket
Steel belt armored vinyl jacket
Fine round steel wire armored vinyl jacket
Fine round steel wire armored polyvinyl chloride jacket
Fine round steel wire armored polyvinyl jacket
Coarse round steel wire armored fiber jacket
Coarse copper wire armored polyvinyl jacket
Coarse steel wire armored vinyl jacket
Aluminum belt armored polyvinyl jacket
Aluminum belt armored vinyl jacket
Double round steel wire armored fiber sheath
Copper belt-valve steel wire armored fiber sheath
Note: Indicates applicable:. Indicates that it is applicable when plastic-coated steel wire or steel wire with a good non-metallic corrosion protection layer is used. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on March 25, 1989 24
Special environment
Implementation on January 1, 1990
3 Structure and material toughness
GB 2932.389
, 3.1 The structure of the outer sheath of non-metallic sheathed cables shall consist of concentric layers as specified in Table 2. Table 2
Inner lining
Plastic wrapping: plastic tape or non-woven tape
Extrusion type: plastic sleeve
Outer sheath
Armor layer
Interlocking armor
Double steel tape armor
Single round wire armor
Double aluminum tape (or aluminum alloy tape) armor
Single meat wire armor
Double coarse saw wire armor
Double steel tape-single coarse mesh steel wire armor
Ethylene jacket
Ethylene jacket
|tt||Polyvinyl jacket
Ethylene jacket
Vinyl jacket
Polyvinyl chloride jacket
Polyvinyl jacket
Adhesive coating-polypropylene insulation or cable insulation-cable insulation-chalk powder
3.212, 22, 23, 32, 33, 62, 63 type lining layer generally adopts wrapping type, but if the materials of armor and metal screen are different, the inner lining layer under the armor must adopt extrusion type, also called separation sleeve. 3.3 The inner layer of the interlocking armor can be made of fiber shrinkage, and its weaving density should not be less than 95%. 3.4 The material of the outer sheath of non-metallic sheathed cables shall comply with the provisions of Chapter 6 of GB2952.1. 4 Size
The size of each component of the cable outer sheath shall be determined by the assumed value of the diameter. The calculation method of the assumed diameter is shown in Appendix A of this standard. All calculated values shall be accurate to 0.1mm. 4.1 Liner thickness
4.1.1 On the extruded inner sheath, the nominal thickness of the wrapped inner sheath shall be 0.8mm, but when the nominal thickness of the armor tape is 0.2mm or less, the nominal thickness of the inner sheath shall be 0.5mm, and the minimum thickness of the wrapped inner sheath at one point shall not be less than 80% of the nominal thickness. 0.2 mm.
4.1.2 On the cable core tape layer, the total thickness of the wrapped inner lining layer and the tape layer is approximately the value in Table 3. The approximate value of the total thickness is a value that is not guaranteed or checked.
Assumed diameter of cable core
Nominal thickness
GB 2952.3—89
4.1.3 The thickness of the interlocking armor inner lining layer shall not be less than 0.6mm. 4.1.4 The nominal thickness of the extruded inner lining layer (or isolation sleeve) shall be determined by formula (1), and its minimum nominal thickness shall be 1.2mm. The nominal thickness of the extruded lining layer can also be directly selected according to Appendix B of this standard. The minimum thickness at any point shall not be less than 80% of the nominal thickness. 0.2mm.
A, - 0.02D.+0.6..
Wu Zhong: A. Nominal thickness of the extruded lining layer (or isolation sleeve), mm; D - the assumed diameter before the sheath, that is, the outer diameter of the concentric conductor or the gold shield, m. 4.1.5 The minimum thickness of the plastic sheath of the thick round steel wire lining layer shall not be less than 2.0 mm. 4.2 Armor layer size
4.2.1 The number, thickness and width of the armored steel strip or armored aluminum strip (including aluminum alloy strip) shall comply with the provisions of Table 4. Table 4
Assumed true diameter before armoring
35.1-50.0
50.1 - 70.0
Number of layers × thickness (not less than)
Aluminum strip or aluminum alloy strip
Width not greater than
Note: When the assumed true diameter before armoring is less than 10.0 mm, fine steel wire armor with a diameter of 0.8~1.6 mm should be used. A layer of chain strontium steel with a thickness of 0.1~0.2 mm can also be used as the energy-saving device, and the selection rate should be not less than 25%. 4.2.2 The number of layers and thickness of the interlocking armored steel belt shall comply with the provisions of Table 5. Table 5
Assumed true diameter before armoring
4.2.3 The diameter of the armored steel wire shall comply with the provisions of Table 6. Table 6
Assumed diameter before armoring
[5.1~25.0
25.1 ~~ 35.0
35.1~60.0
Diameter of fine steel wire
0.8 ~ 1.6
1.6~- 2.0
2.0 ~ 2.5
2.5 ~ 3.15
Number of steel strip layers × thickness
Diameter of thick steel wire
Note: The diameter of the steel wire does not include the non-corrosion protection layer on the steel wire. If the production requirements or the same, it is allowed to use a steel wire with a larger diameter than the specified diameter. 4.3 Thickness of outer layer
4.3.1 The nominal thickness of the outer layer of thick steel wire armored fiber is 2.0mm in general underwater and 4.0mm in seawater. A negative deviation of 20% is allowed, and the positive deviation is not specified.
4.3.2 The nominal thickness of the plastic outer layer shall be determined by formula (2), and its minimum nominal thickness shall be 1.8mm. It can also be directly selected from Appendix C of this standard. The minimum thickness at any point on the outer layer shall not be less than 80% of the nominal thickness - 0.2mm. 26
Where: A.
GB 2952.3-89
A. - 0.035D+1.0..
-Nominal thickness of plastic jacket, mm;
-Assumed diameter before jacket, mm,
5 Process requirements
The process of the outer sheath of non-metallic sheathed cables shall comply with the provisions of Chapter 7 of GB2952.16
Performance requirements
The performance of the outer sheath of non-metallic sheathed cables shall comply with the provisions of Chapter 8 of GB2952.1 Inspection rules
The outer sheath of non-metallic sheathed cables shall be inspected in accordance with the provisions of Chapter 10 of GB2952.1 (2)
GB 2952.3--89
Appendix A
Calculation method of assumed values
(Supplement)
The calculation method of assumed values is intended to eliminate various differences often encountered in general design methods. The calculation method of assumed values is only used to determine the dimensions of each component of the relay sheath. Therefore, the calculated dimensions are assumed dimensions, not actual dimensions. The calculated values should be accurate to 0.1 mm. For communication cables with complex structures, the assumed values can be replaced by the designed values. A1 Symbols are sharp
d--The diameter assumed according to the nominal cross-section S of the conductor, regardless of the shape or whether the conductor is compressed. The conductor can be solid, composite, round or shaped: for cables without nominal cross-section indication, the nominal diameter of the conductor is used. A
--The nominal thickness of the insulation layer, determined according to the product standard, the assumed diameter of the insulating core,
The assumed diameter of the larger insulating core in the insulating core, the assumed diameter of the smaller insulating core in the insulating core, N--The number of cores.
Assumed diameter of the stranded core (cabled) or the assumed diameter of the combined core of the fan cable - the thickness of the inner sheath (extruded or wrapped). - Assumed diameter of the inner sheath.
4 The value of the increase in diameter caused by a concentric conductor or metal shield, D.
The assumed diameter of a concentric conductor or metal shield: the thickness of the inner lining layer (wrapped or extruded isolation sleeve), the assumed outer diameter of the inner lining layer, that is, the assumed diameter before armoring - the nominal thickness of the armor layer: in the case of interlocking armor, the height of the corrugation should be added. The assumed outer diameter of the armor layer,
A2 Calculation method of assumed values
1 Assumed diameter of conductor
Regardless of the shape or degree of compression of the conductor, the assumed diameter of each nominal cross-section of the conductor is specified in Table A!. Table AI
Conductor cross-section S
Assumed diameter d
Conductor cross-section S
Assumed diameter ±
Note: ① The assumed diameter of conductors with a nominal cross-section greater than 1000mm2 can be calculated using d=2s/yuan. 28
Conductor surface S
Assumed diameter d
GB 2952.3-89
③ For conductors not represented by nominal cross-section, the assumed diameter adopts the nominal diameter of the conductor, A2.2 Assumed diameter of insulated core
a. Assumed diameter of unshielded core:
D,= d+24
h. The assumed diameter of the semi-conductive shielded core: D, = +24, +3.0-
c. The assumed diameter of the metal shielded or concentric conductor core should be added with the value specified in Table A3 of Article A2.5. The assumed diameter of the core twisted (cabled) or the assumed diameter of the core of the fan cable 8: 'When the cores of equal conductor carrying area are twisted:
D, - nD:
Where: n-twisting (cabled) coefficient: should be selected according to Table A2, b. When the large-small core is twisted:
When the equal diameter cores of the flat cable are combined:
Number of cores W
2.41(3Dib + D.
Number of cores N
To: 1) For more than 61 cores, the combined (cabled) coefficient can be calculated as n=1.16VN. 2) The cores are twisted in one layer,
A2.4 Assumed true diameter of inner sheath
Dr= D+24
When D, is 40 mm or less, △,=0.,4 mm; when D, is 40 mm or more, A,=0.6 mm 4.70
Number of cores N
GB 2952.3—89
8. Unless the inner sheath is replaced by an inner lining (or isolation sleeve) in accordance with A2.6, for multi-core cables, regardless of whether there is an inner sheath or not, and regardless of whether the inner sheath is extruded or wrapped, the above-mentioned assumed thickness value of the inner lining must be used. For fan cables, treat them as multi-core cables.
b. For single-core cables, if there is an inner sheath, regardless of whether the inner sheath is extruded or wrapped, the assumed thickness value of the inner lining must be adopted. 4g.
A2.5 Assumed diameter D of concentric conductor or metal shield - De+A.*.
If there is no inner sheath, that is, the concentric conductor or metal shield is directly wrapped on the cable core, then: D.=D+A.
4. It should be selected according to Table A3,
Nominal cross-section of concentric conductor or metal shield
Diameter increase
Nominal cross-section of concentric conductor or metal shield
Note: If the nominal cross-section of the concentric conductor or metal shield is between the two values listed in the table, the increased diameter should be the larger value, A2.6 Assumed diameter of the inner lining
. For extruded inner lining (or isolation sleeve): D,=D.±24
A, is the calculated value specified in Article 4.1.4 of this standard. For wrapped inner lining:
Dr=D±24,
A, is the assumed thickness of the inner lining. When the assumed diameter D of the inner sheath is 30mm or less, A.=0.5mm; when D is above 30mm, A,=0.8mm.
c. The thickness of the inner layer of the interlocking armor, regardless of its actual size, is taken as 0.6 mm: A2.7 The assumed diameter of the armor layer
D,= D,±24,
A. is the armor layer thickness specified in Article 4.2 of this standard: - For double-layer metal armor, A, is equal to twice the thickness of the metal strip; for round steel wire armor, A, is equal to the diameter of the steel wire; - For interlocking armor, A. is equal to the thickness of the steel strip plus the corrugation height. 30
GB 2952.3—89
Appendix B
Nominal thickness of extruded lining
(Supplement)
When the metal shield and armor materials are different: the nominal thickness of the inner layer between them should be selected according to the provisions of Table B1. Table B1
Assumed diameter before sheath
37.5~ 42.4
47.5~52.4
52.5 ~ 57.4
57.5~62.4
62.5~67.4
67.5 ~ 72.4
72.5 ~77.4
77.5 -- 82.4
87.5~92.4
92.5~97.4
97.5 ~ 102.4
Nominal thickness of extruded inner layer
GB 2952.3—89
Appendix C
Nominal thickness of plastic jacket
(Supplement)
C1 The nominal thickness of plastic jacket shall comply with the provisions of Table C1. Table C1
Assumed diameter of jacket
12.9~15.7
15.8-18.5
18.6~21.4
24.3~27.1
30.0~32.8
32.9~35.7
35.8~38.5
38.6~41.4
41.5~44.2
44.3~47.1
47.2 ～49.9 .
50.0~52.8
52.9~55.7
Nominal pregnancy of the material jacket
Assumed diameter of the jacket
55.8 ~ 58.5
58.6--61.4
61.5 ~64.2
64.3 ~ 67.1
67.2--69.9
70.0~72.8
72.9~75.7
75.8 ~78.5
78.6~81.4
81.5~-84.2
84.3-87.1
87.2~89.9
92.9~95.7
95.8 ~-98.5
98.6 101.4
Nominal thickness of plastic jacket3 Assumed diameter of twisted (cabled) cores or assumed diameter of combined cores of fan cable 8: 'When cores with equal conductor area are twisted:
D,- nD:
Where: n-twisting (cabled) coefficient: It should be selected according to Table A2, b. When twisted with large and small cores:
When flat cable cores with equal diameters are combined:
Number of cores W
2.41(3Dib + D.
Number of cores N
To: 1) For more than 61 cores, the combined (cabled) coefficient can be calculated as n=1.16VN. 2) The cores are twisted in one layer,
A2.4 Assumed true diameter of inner sheath
Dr= D+24
When D, is 40 mm or less, △,=0.,4 mm; when D, is 40 mm or more, A,=0.6 mm 4.70
Number of cores N
GB 2952.3—89
8. Unless the inner sheath is replaced by an inner lining (or isolation sleeve) in accordance with A2.6, for multi-core cables, regardless of whether there is an inner sheath or not, and regardless of whether the inner sheath is extruded or wrapped, the above-mentioned assumed thickness value of the inner lining must be used. For fan cables, treat them as multi-core cables.
b. For single-core cables, if there is an inner sheath, regardless of whether the inner sheath is extruded or wrapped, the assumed thickness value of the inner lining must be adopted. 4g.
A2.5 Assumed diameter D of concentric conductor or metal shield - De+A.*.
If there is no inner sheath, that is, the concentric conductor or metal shield is directly wrapped on the cable core, then: D.=D+A.
4. It should be selected according to Table A3,
Nominal cross-section of concentric conductor or metal shield
Diameter increase
Nominal cross-section of concentric conductor or metal shield
Note: If the nominal cross-section of the concentric conductor or metal shield is between the two values listed in the table, the increased diameter should be the larger value, A2.6 Assumed diameter of the inner lining
. For extruded inner lining (or isolation sleeve): D,=D.±24
A, is the calculated value specified in Article 4.1.4 of this standard. For wrapped inner lining:
Dr=D±24,
A, is the assumed thickness of the inner lining. When the assumed diameter D of the inner sheath is 30mm or less, A.=0.5mm; when D is above 30mm, A,=0.8mm.
c. The thickness of the inner layer of the interlocking armor, regardless of its actual size, is taken as 0.6 mm: A2.7 The assumed diameter of the armor layer
D,= D,±24,
A. is the armor layer thickness specified in Article 4.2 of this standard: - For double-layer metal armor, A, is equal to twice the thickness of the metal strip; for round steel wire armor, A, is equal to the diameter of the steel wire; - For interlocking armor, A. is equal to the thickness of the steel strip plus the corrugation height. 30
GB 2952.3—89
Appendix B
Nominal thickness of extruded lining
(Supplement)
When the metal shield and armor materials are different: the nominal thickness of the inner layer between them should be selected according to the provisions of Table B1. Table B1
Assumed diameter before sheath
37.5~ 42.4
47.5~52.4
52.5 ~ 57.4
57.5~62.4
62.5~67.4
67.5 ~ 72.4
72.5 ~77.4
77.5 -- 82.4
87.5~92.4
92.5~97.4
97.5 ~ 102.4
Nominal thickness of extruded inner layer
GB 2952.3—89
Appendix C
Nominal thickness of plastic jacket
(Supplement)
C1 The nominal thickness of plastic jacket shall comply with the provisions of Table C1. Table C1
Assumed diameter of jacket
12.9~15.7
15.8-18.5
18.6~21.4
24.3~27.1
30.0~32.8
32.9~35.7
35.8~38.5
38.6~41.4
41.5~44.2
44.3~47.1
47.2 ～49.9 .
50.0~52.8
52.9~55.7
Nominal pregnancy of the material jacket
Assumed diameter of the jacket
55.8 ~ 58.5
58.6--61.4
61.5 ~64.2
64.3 ~ 67.1
67.2--69.9
70.0~72.8
72.9~75.7
75.8 ~78.5
78.6~81.4
81.5~-84.2
84.3-87.1
87.2~89.9
92.9~95.7
95.8 ~-98.5
98.6 101.4
Nominal thickness of plastic jacket3 Assumed diameter of twisted (cabled) cores or assumed diameter of combined cores of fan cable 8: 'When cores with equal conductor area are twisted:
D,- nD:
Where: n-twisting (cabled) coefficient: It should be selected according to Table A2, b. When twisted with large and small cores:
When flat cable cores with equal diameters are combined:
Number of cores W
2.41(3Dib + D.
Number of cores N
To: 1) For more than 61 cores, the combined (cabled) coefficient can be calculated as n=1.16VN. 2) The cores are twisted in one layer,
A2.4 Assumed true diameter of inner sheathWww.bzxZ.net
Dr= D+24
When D, is 40 mm or less, △,=0.,4 mm; when D, is 40 mm or more, A,=0.6 mm 4.70
Number of cores N
GB 2952.3—89
8. Unless the inner sheath is replaced by an inner lining (or isolation sleeve) in accordance with A2.6, for multi-core cables, regardless of whether there is an inner sheath or not, and regardless of whether the inner sheath is extruded or wrapped, the above-mentioned assumed thickness value of the inner lining must be used. For fan cables, treat them as multi-core cables.
b. For single-core cables, if there is an inner sheath, regardless of whether the inner sheath is extruded or wrapped, the assumed thickness value of the inner lining must be adopted. 4g.
A2.5 Assumed diameter D of concentric conductor or metal shield - De+A.*.
If there is no inner sheath, that is, the concentric conductor or metal shield is directly wrapped on the cable core, then: D.=D+A.
4. It should be selected according to Table A3,
Nominal cross-section of concentric conductor or metal shield
Diameter increase
Nominal cross-section of concentric conductor or metal shield
Note: If the nominal cross-section of the concentric conductor or metal shield is between the two values listed in the table, the increased diameter should be the larger value, A2.6 Assumed diameter of the inner lining
. For extruded inner lining (or isolation sleeve): D,=D.±24
A, is the calculated value specified in Article 4.1.4 of this standard. For wrapped inner lining:
Dr=D±24,
A, is the assumed thickness of the inner lining. When the assumed diameter D of the inner sheath is 30mm or less, A.=0.5mm; when D is above 30mm, A,=0.8mm.
c. The thickness of the inner layer of the interlocking armor, regardless of its actual size, is taken as 0.6 mm: A2.7 The assumed diameter of the armor layer
D,= D,±24,
A. is the armor layer thickness specified in Article 4.2 of this standard: - For double-layer metal armor, A, is equal to twice the thickness of the metal strip; for round steel wire armor, A, is equal to the diameter of the steel wire; - For interlocking armor, A. is equal to the thickness of the steel strip plus the corrugation height. 30
GB 2952.3—89
Appendix B
Nominal thickness of extruded lining
(Supplement)
When the metal shield and armor materials are different: the nominal thickness of the inner layer between them should be selected according to the provisions of Table B1. Table B1
Assumed diameter before sheath
37.5~ 42.4
47.5~52.4
52.5 ~ 57.4
57.5~62.4
62.5~67.4
67.5 ~ 72.4
72.5 ~77.4
77.5 -- 82.4
87.5~92.4
92.5~97.4
97.5 ~ 102.4
Nominal thickness of extruded inner layer
GB 2952.3—89
Appendix C
Nominal thickness of plastic jacket
(Supplement)
C1 The nominal thickness of plastic jacket shall comply with the provisions of Table C1. Table C1
Assumed diameter of jacket
12.9~15.7
15.8-18.5
18.6~21.4
24.3~27.1
30.0~32.8
32.9~35.7
35.8~38.5
38.6~41.4
41.5~44.2
44.3~47.1
47.2 ～49.9 .
50.0~52.8
52.9~55.7
Nominal pregnancy of the material jacket
Assumed diameter of the jacket
55.8 ~ 58.5
58.6--61.4
61.5 ~64.2
64.3 ~ 67.1
67.2--69.9
70.0~72.8
72.9~75.7
75.8 ~78.5
78.6~81.4
81.5~-84.2
84.3-87.1
87.2~89.9
92.9~95.7
95.8 ~-98.5
98.6 101.4
Nominal thickness of plastic jacket4
47.5~52.4
52.5 ~ 57.4
57.5~62.4
62.5~67.4
67.5 ~ 72.4
72.5 ~77.4| |tt||77.5 -- 82.4
87.5~92.4
92.5~97.4
97.5 ~ 102.4
Nominal thickness of extruded inner layer
GB 2952.3—89
Appendix C
Nominal thickness of plastic jacket
(Supplement)
C1 The nominal thickness of the plastic jacket shall comply with the provisions of Table C1. Table C1
Assumed diameter of sheath before use
12.9~15.7
15.8-18.5
18.6~21.4
24.3~27.1
30.0 ~32.8
32.9~35.7
35.8~38.5
38.6~41.4
41.5~44.2
44.3~47.1
47.2 ~49.9 .
50.0~52.8
52.9~55.7
Nominal pregnancy of the outer jacket
Assumed diameter of the jacket
55.8 ~ 58.5||tt ||58.6--61.4
61.5 ~64.2
64.3 ~ 67.1
67.2--69.9
70.0~72.8
72.9~75.7||tt ||75.8 ~78.5
78.6~81.4
81.5~-84.2
84.3-87.1
87.2~89.9
92.9~95.7
95.8 ~ -98.5
98.6 101.4
Nominal thickness of plastic jacket4
47.5~52.4
52.5 ~ 57.4
57.5~62.4
62.5~67.4
67.5 ~ 72.4
72.5 ~77.4| |tt||77.5 -- 82.4
87.5~92.4
92.5~97.4
97.5 ~ 102.4
Nominal thickness of extruded inner layer
GB 2952.3—89
Appendix C
Nominal thickness of plastic jacket
(Supplement)
C1 The nominal thickness of the plastic jacket shall comply with the provisions of Table C1. Table C1
Assumed diameter of sheath before use
12.9~15.7
15.8-18.5
18.6~21.4
24.3~27.1
30.0 ~32.8
32.9~35.7
35.8~38.5
38.6~41.4
41.5~44.2
44.3~47.1
47.2 ~49.9 .
50.0~52.8
52.9~55.7
Nominal pregnancy of the outer jacket
Assumed diameter of the jacket
55.8 ~ 58.5||tt ||58.6--61.4
61.5 ~64.2
64.3 ~ 67.1
67.2--69.9
70.0~72.8
72.9~75.7||tt ||75.8 ~78.5
78.6~81.4
81.5~-84.2
84.3-87.1
87.2~89.9
92.9~95.7
95.8 ~ -98.5
98.6 101.4
Nominal thickness of plastic jacket
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