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Railway Cables
 

G7622 Trackside Communications Cables

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

 

 
   
   
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