JB/T 681-1999 Copper core paper insulated twisted pair local communication cable

This standard specifies the technical requirements, inspection rules, delivery length, marking and packaging of copper core paper insulated twisted pair local communication cables. This standard applies to copper-core paper insulated twisted-pair local communication cables used in telecommunications lines in cities, suburbs, towns and other areas. JB/T 681-1999 Copper core paper insulated twisted pair local communication cable JB/T681-1999 standard download and decompression password: www.bzxz.net

Pressing Machinery Ring Industry Standard JB/T6811999
1999-08-064
Double
Female
2000-01-01
JB/T681±1999||tt| |e
This standard is a revision of JB681-81 "Copper core paper insulated twisted pair local communication cable". This standard replaces JB681-81 from the date of implementation. This standard is proposed and administered by the National Technical Committee for Standardization of Wires and Cables. This standard was drafted by: Shanghai Cable Research Institute. The main drafter of this standard: Lin Zhenrong.
1 range
G 20P uxEe/
JB/T681±1999
JB681E81
This standard specifies copper core paper Technical requirements, inspection rules, delivery length, marking and packaging of insulated twisted pair local communication cables. This standard applies to copper core paper insulated twisted pair local communication cables. Cables are used in telecommunications lines in urban, suburban and town areas. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this international standard by being quoted in this standard. The editions shown were valid at the time of publication of the standard. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T 469—1995
GB/T2952-1989
GB/T3048—1994
GB/T3953—1983
GB/T5441—1985||tt| |GB/T7970—1987
GB/T10334—1989Www.bzxZ.net
JB5268.2—1991
JB/T8137—1999
Lead ingot
Outside the cable Sheath
Electrical performance test method of wire and cable
Electrical round copper wire
Test method of communication cable
Communication cable paper
Telephone paper||tt| |Cable metal sheath lead sheath
Wire and cable delivery tray
3 symbols, codes and product representation methods
3.1 symbols, codes
3.1.1 series codes|| tt||3.1.2 Insulation structure code
Paper insulation
3.1.3 Metal sleeve code
Lead sleeve
3.1.4 Outer sheath code||tt| |3.2 Product representation method
Omitted
·According to GB/T2952
Cables are represented by model, specification and standard number. For example: copper core insulated twisted pair bare lead sheathed local communication cable, 300 pairs, wire diameter 0.5mm, expressed as:
HQ300×2×0.5JB/T681-1999
4 model|| tt||Cable models are shown in Table 1.
1999-08-06rat
2000-01-01
HQ42| |tt||HQ43
5 specifications
JB/T681±1999
Table 1
name||tt ||Copper core paper insulated counter-grain bare lead sheath local communication cable copper core paper insulated twisted lead sheath PVC sleeve local communication cable name
copper core paper insulated counter-grain lead sheath steel strip absolute fiber Copper core paper insulated twisted lead sheath for local communication cable, steel tape armored PVC sleeve, copper core paper insulated twisted lead sheath for local communication cable, steel tape armored polyethylene sleeve for local communication cable, copper core paper insulated against texture Lead sheath, fine steel wire armored PVC sheath for local communication cable, copper core paper insulated twisted lead sheath, fine steel wire armored polyethylene sheath, local communication cable, copper core paper insulated, paired lead sheath, thick steel wire armored, red dimensional outer cover Internal communication cable Copper core paper insulated counter-grain lead sheath Thick steel wire armored polyvinyl chloride sleeve Internal communication cable Copper core paper insulated counter-grain lead sheath Thick steel wire armored polyethylene sleeve The specifications of the local communication cable are as shown in Table 2.
The number of pairs of cables is shown in Table 3. The actual number of pairs of cables upon delivery is the nominal number of pairs plus the number of reserved pairs. The nominal logarithm should comply with the requirements in Table 3. Table 2
HQ02,HQ03
HQ22.HQ23|| tt||HQ32.HQ33,HQ42,HQ43
nominal logarithm
25| |tt||30
preparatory logarithm
0| |tt||0
5~1800
50~1200||tt ||50~400
nominal logarithm
5~1200
20~900
50~600|| tt||30~400
50~400
Table 3
preparatory logarithm||tt ||1
Note: Adding reserve pairs is allowed number, but shall not exceed 1.5% of the nominal logarithm. 6
Technical requirements
Conductor
The nominal diameter of the conductor shall comply with the provisions of Table 2. 2 Insulation
Use paper tape insulation, and the overlap rate of paper tape wrapping should not be less than 20%. 2
straight
number
20~600
30~600| |tt||30~400
30~400
nominal logarithm
1200|| tt||1400
20~400
20~400|| tt||20~300
20~300
preparatory logarithm
12||tt| |14
6.3 twisting
6.3.1 pairs of wire group twisting
JB/T681±1999
6.3.1.1 Twist two insulated wire cores into a pair, and the twisting pitch should not be greater than 120mm. 6.3.1.2 There should be one wire in the pair whose core insulation is red or blue (or has obvious red or blue vertical stripes with an interval of no more than 100rm), and the other wire should be natural (not colored). 6.3.1.3 The insulation color can still be identified at +190℃. 6.3.2 Cable core twisting
6.3.2.1 Twist the wire combination into a cable core.
6.3.2.2200 pairs and below can be twisted concentrically. The two adjacent layers have opposite twisting directions. Cotton yarn or other similar fiber yarns should be loosely wound between each layer. There should be a pair of marks in each layer. There should be one core in the center of the marked pair that is a different color than the insulation of all the remaining cores in that layer.
Unit twisting can be used for 3150 pairs and above. Each unit consists of 50 pairs or 100 pairs, and the outside of each unit should be lightly wound with cotton yarn 6.3. 2.3
or other similar fiber yarns. The stranding direction of each unit is the same as the stranding direction of the cable core. There should be one marking unit in each layer of the cable core. In a common unit, there is one flag pair that is blue and white, and the other line pairs are red and white. One of the marking units in the marking unit is red and white, and the other pairs are blue and white.
6.3.2.4 The twisting pitch of concentric twisted cable cores and adjacent wire pairs on the same layer in any unit should be different. 6.3.2.5 At least two layers of paper tape should be overlapped and wrapped around the cable core. The outermost layer of paper tape should be printed with the name of the manufacturer and the year of manufacture every approximately 300mm, or a strip should be placed longitudinally within the lead sheath every 1m. Logo tape with a similar logo printed on it. Cables with a diameter less than 20mm in front of the lead package are allowed to be replaced with the manufacturer's logo colored wire or paper tape. A size tape should be placed inside the metal sheath of the cable. 6.4 Lead sheath
6.4.1 The thickness of the lead sheath shall comply with the requirements in Table 4. HQ
Lead sheath front diameter
below 6.00
6.01~8.00
8.01~13.00
13.01~16.00
16.01~20.00
20.01~23.00
23.01~26.00
26.01~30.00
30.01~33.00
33.01~36.00
36.01~40.00|| tt||40.01~43.00
43.01~46.00
46.01~50.00
50.01~53.00
53.01~56.00
56.01~60.00||tt| |Above 60.00
2.40| |tt||2.50
Table 4 Lead sleeve thickness
HQ32.JQ33,HQ11,HQ12,HQ3||tt ||HQ02.HQ03,HQ22.HQ23
nominal
1.60||tt| |1.70
2.50||tt| |2.60
Note, the minimum lead sleeve thickness does not apply to the joint when the lead press is stopped. min
2.10| |tt||2.20
6.4.2 The alloy composition of the lead sleeve shall comply with the provisions of 14.1 in JB5268.2-1991. Nominal
minimum
1.90|| tt||2. 0
nominal
2.70| |tt||2.70
JB/T681±1999
6.4.3 When the inner diameter of the lead sleeve is greater than 15mm, it should Withstand expansion testing. 6.4.4 The lead sleeve should be sealed.
6.5 Outer sheath
The outer sheath of the cable shall comply with the regulations of GB/T2952. 6.6 Electrical performance
The electrical performance of the cable should comply with the requirements in Table 5. Table 5
Serial number
The DC resistance of the wire core at 20℃ is not greater than
Q0.4mm||tt ||@0.5mm
The insulation resistance at 20℃ is not less than
Each wire core is grounded to the remaining wires||tt| |Operating capacitance
Nominal average
Maximum average
Maximum value
Insulation electrical strength, core-to-core and core-to-ground AC 50Hz2min
The wire cores are not mixed and the lines are not connected
0/km||tt| |M2·km
Indicator
2000|| tt||50
1 During the production process, the insulation resistance is allowed to be measured with a megger or high resistance meter. Test method
GB/T 3048.4
GB/T3048.5 or
GB/T 3048.6
GB/T 5441.2
GB/T 3048.14| |tt||Electric bells, earphones or indicator lights
Inspection regulations
1) Random inspection, 1% per plate, but not less than 20
2) 10 100% for those below
1) Random inspection
3 strands for 150 pairs and below
6 strands for 200 pairs and above
2) There is one strand during random inspection Those below 3000
MQ·km should double the random inspection
1) Random inspection, 2% per plate, but not less than 20
2) Below 20 pairs or 100%
3) When the test result is greater than 56nF/km
, the random inspection should be doubled
2 During the withstand voltage test , the insulated cores of all working pairs are divided into two groups. When testing the first group, the second group is connected to the lead sleeve and grounded. When testing the second group, the first group is connected to the lead sleeve and grounded.
6.7 Raw materials
The main raw materials used for manufacturing cables should comply with: a) Round copper wire--TR type in GB/T3953;
b) Lead--GB/T469;||tt ||C) Telephone paper—GB/T10334:
d) Communication cable paper—GB/T7970.
7 Inspection Rules
7.1 Products can only leave the factory after passing the inspection by the technical inspection department of the manufacturer. Each batch of products leaving the factory should be accompanied by the manufacturer's product quality inspection certificate.
7.2 The electrical properties of the cable are tested according to Table 5, and other properties are tested according to Table 6 4
serial number
4||tt ||8
Project name
Structure and appearance
Lead sleeve: thickness
Alloy lead composition
Expansion performance
Sealing performance| |tt||Outer sheath
Length
Delivery length
Standard provision number
6.1,6.2,6.3
6.4.1||tt ||6.4.2
JB/T681±1999
Table 6
Test method
Day force, micrometer or caliper
5.2 in JB5268.2-1991
5.1 in JB5268.2-1991
JB5268.2 -5.5 in 1991
JB5268.2--5.3 in 1991
GB/T2952
Meter counter or length marking tape
Inspection regulations
Control and factory inspection
Sampling inspection at least once a week
10% push inspection, at least 1 piece
100%| | tt | | 100% | | tt | 8%.
8.2 Any length of cable is allowed for delivery based on mutual agreement. 8.3 The length measurement error should not exceed ±1%. 9 Marking and packaging
9.1 The cable should be neatly wound on the cable drum for delivery, and the cable drum should comply with the regulations of JB/T8137. The simplified diameter of the cable drum should not be less than 25 times the outer diameter of the cable. The cable ends must be sealed and welded and fixed on the drum. The cable ends extending out of the drum should be nailed with protective covers. 9.2 The cable installed in the tray should be filled with 0.3~1.2MPa dry air or nitrogen. 9.3 The cable tray should be marked:
a) Manufacturer’s name and trademark;
b) Cable model and specifications;
c) Cable length, m;
d ) Gross weight, kg;
e) Manufacturing date: year, month,
f) Arrow indicating the correct rotation direction of the cable drum; g) Standard number: JB/T681—1999
JB/T6811999
degree by g||tt ||2A
880A1230
19XXA XX
XXX|| tt||halogen
100044
||XXXXX
|tt||6661189
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