G7622 Trackside Communications Cables
Application
The cables are designed for installation in trackside bracket runs and for use within railway equipment rooms within open locations (type 1) or in subsurface tunnels and underground locations (type 2).
Standards
● LUL Spec G7622 A1 type 1 (for PVC sheath)
● LUL Spec G7622 A1 type 2 (for LSZH sheath)
Construction
Conductors
Solid plain copper, 0.63/0.9 mm nominal diameter.
Insulation
Cellular polyethylene.
Cabling Element
Four insulated conductors are twisted together to form a quad.
Stranding
Conductors are helically stranded in concentric layers.
Core Wrapping
Plastic tape (s) with overlapping.
Moisture Barrier
One laminated sheath made of aluminium tape (0.15mm thick) coated with PE-Copolymer on at least one side is applied with longitudinally overlap.
Outer Sheath
LSZH sheath, coloured violet.
Optional
Type 1 Cables: For type 1 cables, additional foil (at least one polyester tape) and PVC sheath are applied over the
LSZH sheath. (VDE Code: A-02Y(L)HY)
Armoured Cables: Corrugated steel tape armour is applied with an overlap over LSZH sheath. An outer LSZH
sheath is applied over the armour. (VDE Code: A-02Y(L)H(SR)H)
Electrical Characteristics at 20℃
| Nominal Conductor Diameter |
mm |
0.63 |
0.9 |
| Maximum Conductor Resistance |
|
|
|
| Average Value |
Ω/km |
57.5 |
28 |
| Individual Value |
Ω/km |
59 |
29 |
| Minimum Insulation Resistance @500 V DC |
MΩ.km |
1500 |
1500 |
| Maximum Average Mutual Capacitance |
nF/km |
59 |
59 |
| Maximum Average Capacitance Unbalance |
|
|
|
| Between pairs in same quad |
pF/460m |
50 |
50 |
| Between pairs (centre or in any layer) |
pF/460m |
30 |
30 |
| Between any pairs and earth |
pF/460m |
200 |
200 |
| Between phantom and pairs in same quad |
pF/460m |
300 |
300 |
Mechanical and Thermal Properties
Minimum Bending Radius: 7.5×OD (unarmoured); 10×OD (armoured)
Temperature Range: -40℃ to +70℃ (during operation); -10℃ to +50℃ (during installation)
Core Identifi cation
Quad colours in centre and even layers
| Position of Quad in Layer |
Centre and Even Layers |
Quad Whipping Colours |
A Wire |
B Wire |
C Wire |
D Wire |
| 1st Quad (Marker) |
ORANGE |
WHITE |
BLUE |
GREY |
WHITE/ORANGE |
| Even Quads |
RED |
WHITE |
VIOLET |
YELLOW |
WHITE |
| Odd Quads |
BROWN |
WHITE |
GREEN |
GREY |
WHITE |
| Last Quad |
ORANGE |
WHITE |
RED |
GREEN |
WHITE/ORANGE |
Quad colours in odd layers
| Position of Quad in Layer |
Centre and Even Layers |
Quad Whipping Colours |
A Wire |
B Wire |
C Wire |
D Wire |
| 1st Quad (Marker) |
ORANGE |
BLACK |
BLUE |
GREY |
WHITE/ORANGE |
| Even Quads |
RED |
BLACK |
VIOLET |
YELLOW |
WHITE |
| Odd Quads |
BROWN |
BLACK |
GREEN |
GREY |
WHITE |
| Last Quad |
ORANGE |
BLACK |
RED |
GREEN |
WHITE/ORANGE |
Make-up of cable
Number of Pairs |
Number of Quads in centre and successive layers |
Centre |
1st Layer |
2ndLayer |
3th Layer |
4th Layer |
5th Layer |
6th Layer |
8 |
4 |
- |
- |
- |
- |
- |
- |
14 |
1 |
6 |
- |
- |
- |
- |
- |
20 |
2 |
8 |
- |
- |
- |
- |
- |
28 |
4 |
10 |
- |
- |
- |
- |
- |
38 |
1 |
6 |
12 |
- |
- |
- |
- |
54 |
3 |
9 |
15 |
- |
- |
- |
- |
74 |
1 |
6 |
12 |
18 |
- |
- |
- |
104 |
4 |
10 |
16 |
22 |
- |
- |
- |
160 |
4 |
10 |
16 |
22 |
28 |
- |
- |
228 |
4 |
10 |
16 |
22 |
28 |
34 |
- |
308 |
4 |
10 |
16 |
22 |
28 |
34 |
40 |
|
