computer shielding cable (cable for dsc system)
http://www.ahdqjt.com time: 11/04/10 10:32it is used as connection cable of inspection devices and instruments with high demand on interference resistant performance in computer network and control system.
executive standard:
q/tk.j.04.030-2004 or bs5308 standard for reference
performance for usage:
1. ac rated voltage u0/u: 300/500v. long term working temperature of cable conductor is 70℃ & 105℃ for cable with pvc insulation, 70℃ for cable with pe insulation and 90℃ for cable with xlpe insulation.(xlpe insulation includes silane xlpe & irradiation xlpe insulation.)
2. min. environment temperature is -40℃ for fixed laying and -15℃ for non-fixed laying. environment temperature shall be no less than 0℃ for installing.
3. min. bending radius allowed by cable is no less than 6 times that of cable od for non-armored soft cable or braided shielding cable and 12 times that of cable od for cable with metallic tape wrapped shielding or steel wire/steel tape armor.
type, description and definition
example: djyp3vp3-32
32: steel wire winding armor pvc outer sheath
p3: aluminum-plastic compound tape wrapped general shielding
v: pvc inner sheath
p3: aluminum-plastic compound tape wrapped individual shielding
y: pe insulation
dj: series number of computer cable
main technical parameter
- dc resistance of conductor at 20℃
nominal cross section area (mm2) |
pieces of conductor/diameter of single piece |
dc resistance of conductor at 20℃ |
|||
a |
b |
c |
a, b |
r |
|
0.5 |
1/0.80 |
7/0.30 |
16/0.20 |
≤36.0 |
≤39.0 |
0.75 |
1/0.97 |
7/0.37 |
24/0.20 |
≤24.5 |
≤26.0 |
1.0 |
1/1.13 |
7/0.43 |
32/0.20 |
≤18.1 |
≤19.5 |
1.5 |
1/1.38 |
7/0.52 |
30/0.25 |
≤12.1 |
≤13.3 |
2.5 |
1/1.78 |
7/0.68 |
49/0.25 |
≤7.41 |
≤7.98 |
2. insulation resistance at 20℃
performance item |
pvc insulation |
pe, xlpe insulation |
insulation resistance at 20℃ |
≥25 |
≥500 |
3. cable shall endure a.c. voltage test of 2000v under power frequency for 1min without puncture of insulation. and testing temperature is environment temperature.
cables
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