RT/ZHLS, A-2Y(L)2Y External Telephone Cables
to NR/PS/TEL/00015
2Y_External_Telephone_Cables.jpg)
Application
The cables are designed primarily for trackside railway installation in non electrifi ed area. For direct burial application, brass tape armoured or Zetabon type corrugated steel tape armoured can be offered against rodent attack.
Standards
● NR/PS/TEL/00015 (formerly RT/E/PS/00015 or GK/RT 0315)
● TS0886/BR1822
● BR892
Construction
Conductors
Solid plain copper conductor, 0.63 or 0.9 mm nominal diameter.
Insulation
Solid polyethylene to BS 6234.
Cabling Element
Two insulated conductors are twisted together to form a pair.
Stranding
Pairs are helically stranded in 10 pair units.
Core Wrapping
Plastic tape(s) with overlapping.
Moisture Barrier
One laminated sheath made of aluminium tape (0.15mm) coated with PE-Copolymer on at least one side is applied with longitudinally overlap.
Outer Sheath
Polyethylene to BS 6234. LSZH compound option can be offered upon request.
Optional
Jelly Filled Cables: The cable core interstices are fi lled with petroleum jelly to avoid longitudinal water penetration
within the cable. The water resistant filling compound is applied to the air space between non-hygroscopic tape and shield, shield and sheath within the cable core.
Armoured Cables: Corrugated steel tape armour coated on both sides with copolymer can be applied over an
intermediate sheath. The steel tape thickness is 0.145mm. Brass tape armour can be offered as an option.
Electrical Characteristics at 20℃
| Nominal Conductor Diameter |
mm |
0.63 |
0.9 |
| Maximum Conductor Resistance |
Ω/km |
60.0 |
30.0 |
| Minimum Insulation Resistance @500 V DC (1min) |
MΩ.km |
1500 |
1500 |
| Maximum Conductor Capacitance @1000Hz (AC) |
|
|
|
Maximum Average Value |
|
|
|
| For 20 pairs or less |
nF/km |
70 |
79 |
| More than 20 pairs |
nF/km |
67 |
75 |
| Maximum Individual Value 99% of pairs |
|
|
|
| Up to 20 pairs |
nF/km |
79.0 |
85.0 |
| More than 20 pairs |
nF/km |
75.0 |
81.0 |
| Maximum Capacitance Unbalance @1000Hz pair to pair (99% of pairs) |
|
|
|
| For 2 pairs (1 quad) |
pF/500m |
800 |
800 |
| All other sizes |
pF/500m |
275 |
275 |
| Dielectric Strength, conductor to screen (DC voltage 2mins) |
V |
2000 |
2000 |
| Maximum Average Attenuation |
|
|
|
| @1.0KHz |
dB/km |
1.40 |
0.95 |
| @2.4KHz |
dB/km |
2.15 |
1.46 |
| @1.024MHz |
dB/km |
18.70 |
14.6 |
| Minimum Average Near-end Crosstalk |
|
|
|
| @1.0KHz |
dB/km |
70 |
70 |
| @2.4KHz |
dB/km |
65 |
65 |
| @1.024MHz |
|
|
|
| Within Units |
dB/km |
40 |
40 |
| Between Units |
dB/km |
47 |
47 |
| High Voltage Breakdown Test |
|
|
|
| DC for 2mins |
V |
2000 |
2000 |
| AC for 2mins |
V |
1333 |
1333 |
Mechanical and Thermal Properties
Minimum Bending Radius: 7.5×OD (unarmoured); 10×OD (armoured)
Temperature Range: -40℃ to +70℃ (during operation); -10℃ +60℃ (during installation)
Core Identification
Colour scheme, unit binder colour and cable make-up according to NR/PS/TEL/00015
Pair Number |
A Wire |
B Wire |
Unit Number |
Binder Colour |
Cable Size |
Number and Pair Size of Unit |
Centre |
1st Layer |
1 |
WHITE |
BLUE |
1 |
BLUE |
2 |
1x2 |
- |
2 |
WHITE |
ORANGE |
2 |
ORANGE |
5 |
1x5 |
- |
3 |
WHITE |
GREEN |
3 |
GREEN |
10 |
1x10 |
- |
4 |
WHITE |
BROWN |
4 |
BROWN |
20 |
4x5 |
- |
5 |
WHITE |
GREY |
5 |
GREY |
20 |
2x10 |
- |
6 |
RED |
BLUE |
6 |
WHITE |
30 |
6x5 |
- |
7 |
RED |
ORANGE |
7 |
RED |
30 |
3x10 |
- |
8 |
RED |
GREEN |
8 |
BLACK |
50 |
5x10 |
- |
9 |
RED |
BROWN |
9 |
YELLOW |
50 |
1x10 |
4x10 |
10 |
RED |
GREY |
10 |
VIOLET |
75 |
3x5 |
6x10 |
|
|
|
|
|
100 |
2x10 |
8x10 |
|
|
|
|
|
100 |
3x10 |
7x10 |
|
|
|
|
|
100 |
4x5 |
8x10 |
|
