Telephone Cables

 Indoor Switchboard Telephone Cables to CW 1293

Application

The cables are designed to handle low frequency signals for short range applications,suitable for cross connecting individual items of switchboard equipment and to connect exchanges with internal distribution points. The cables are intended to be terminated in Insulation/displacement Connectors (IDC).

Standards

• CW 1293
• IEC 60189-2
• IEC 60332-1
• UL1581 VW-1 & UL1666
• IEEE 383CI.IE

 

Construction

Conductors
Solid annealed bare copper 0.4/0.5/0.6/0.9mm as per class 1 of BS 6360 and IEC 60228

Insulation
Colour coded PVC T154 to BS 7878 or equivalent. LSZH option can be offered upon request

Twisted Pairs
Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk

Cabling Element
Twisted Pairs/Triples/Quads

Cable Core Assembly
There are two modes of construction: layer construction and unit construction. For layer construction, cables are laid up in concentric layers to form a compact and circular cable. For unit construction, the elements shall be pairs and shall be laid up as units or sub-units. Each unit shall consist of 20 pair

Core Wrapping
Cable containing more than 12 wires has a polyester tape applied over the cable core prior to sheathing

Screen (optional)
An aluminium polyester foil shield can be provided for fully enclosing the core with an overlap

Sheath
PVC TM51 to BS 7878 or equivalent. Grey, White or Cream colours are standard. LSZH option can be offered upon request

Ripcord
Nylon ripcord may be placed parallel to the cores to facilitate sheath removal

Drain Wire (optional)
For screened cables, a solid tinned copper drain wire may be longitudinally laid to ensure electrical continuity of the screen

Electrical & Mechanical Properties

Nominal Conductor Diameter

mm

0.4

0.5

0.6

0.9

Conductor Size

mm2

0.126

0.196

0.28

0.636

Maximum Conductor Resistance @20°C

Ω/km

153

97.8

67.9

29.6

Minimum Insulation Resistance @500V DC @20°C

MΩ.km

50

50

50

50

Maximum Capacitance Unbalance pair-to-pair *

pF/500m

*200/300

500

300

300

Minimum Insulation Thickness

mm

0.15

0.15

0.15

0.25

Maximum Insulated Conductor Diameter

mm

0.85

0.95

1.05

1.6

* For 25, 50 & 100 pair 0.4mm conductor size

Mechanical and Thermal Properties

Temperature range during operation (fixed state): -30°C – +70°C
Temperature range during installation (mobile state): -20°C – +50°C
Minimum bending radius: 7.5 x Overall Diameter

Color Code

The pair colour scheme for these cables complies with IEC 189-2 & 189-3 given in the Colour Code Chart below, with the exception of the 2 pair cable, which is constructed as a quad and a colour scheme of Blue, Green, Orange and Brown respectively.
Make-up & Unit Identification Colours – 20 Pair Unit

Pair Size 20 Pairs 40 Pairs 80 Pairs 160 Pairs 320 Pairs
Number of Units

Center

1

4 x  ½

1

4 x  ½

1

1st Layer

 

 

6 x  ½

6

5

2nd Layer

 

 

 

 

10

Colours of Unit Lappings

1

ORANGE

ORANGE

ORANGE

ORANGE

ORANGE

2

 

GREEN

ORANGE

GREEN

ORANGE

3

 

 

NATURAL

ORANGE

NATURAL

4

 

 

GREEN

NATURAL

NATURAL

5

 

 

 

NATURAL

NATURAL

6

 

 

 

NATURAL

GREEN

7

 

 

 

NATURAL

ORANGE

8

 

 

 

GREEN

NATURAL

9 – 15

 

 

 

 

NATURAL

16

 

 

 

 

GREEN

Note 1: ½ refers to sub-units of 10 Pairs.
Colour Scheme for Pairs & Triples

Cabling
Element
No.
a-wire b-wire Cabling
Element
No.
a-wire b-wire Cabling
Element
No.
a-wire b-wire

1

WHITE

BLUE

41

WHITE

Orange

BLUE

81

WHITE

Brown

BLUE

2

WHITE

ORANGE

42

WHITE

Orange

ORANGE

82

WHITE

Brown

ORANGE

3

WHITE

GREEN

43

WHITE

Orange

GREEN

83

WHITE

Brown

GREEN

4

WHITE

BROWN

44

WHITE

Orange

BROWN

84

WHITE

Brown

BROWN

5

WHITE

GREY

45

WHITE

Orange

GREY

85

WHITE

Brown

GREY

6

RED

BLUE

46

ORANGE

Red

BLUE

86

RED

Brown

BLUE

7

RED

ORANGE

47

ORANGE

Red

ORANGE

87

RED

Brown

ORANGE

8

RED

GREEN

48

ORANGE

Red

GREEN

88

RED

Brown

GREEN

9

RED

BROWN

49

ORANGE

Red

BROWN

89

RED

Brown

BROWN

10

RED

GREY

50

ORANGE

Red

GREY

90

RED

Brown

GREY

11

BLACK

BLUE

51

ORANGE

Black

BLUE

91

BROWN

Black

BLUE

12

BLACK

ORANGE

52

ORANGE

Black

ORANGE

92

BROWN

Black

ORANGE

13

BLACK

GREEN

53

ORANGE

Black

GREEN

93

BROWN

Black

GREEN

14

BLACK

BROWN

54

ORANGE

Black

BROWN

94

BROWN

Black

BROWN

15

BLACK

GREY

55

ORANGE

Black

GREY

95

BROWN

Black

GREY

16

YELLOW

BLUE

56

YELLOW

Orange

BLUE

96

YELLOW

Brown

BLUE

17

YELLOW

ORANGE

57

YELLOW

Orange

ORANGE

97

YELLOW

Brown

ORANGE

18

YELLOW

GREEN

58

YELLOW

Orange

GREEN

98

YELLOW

Brown

GREEN

19

YELLOW

BROWN

59

YELLOW

Orange

BROWN

99

YELLOW

Brown

BROWN

20

YELLOW

GREY

60

YELLOW

Orange

GREY

100

YELLOW

Brown

GREY

21

WHITE

Blue

BLUE

61

WHITE

Green

BLUE

101

WHITE

Grey

BLUE

22

WHITE

Blue

ORANGE

62

WHITE

Green

ORANGE

102

WHITE

Grey

ORANGE

23

WHITE

Blue

GREEN

63

WHITE

Green

GREEN

103

WHITE

Grey

GREEN

24

WHITE

Blue

BROWN

64

WHITE-

Green

BROWN

104

WHITE

Grey

BROWN

25

WHITE

Blue

GREY

65

WHITE

Green

GREY

105

WHITE

Grey

GREY

26

RED

Blue

BLUE

66

GREEN

Red

BLUE

106

GREY

Red

BLUE

27

RED

Blue

ORANGE

67

GREEN

Red

ORANGE

107

GREY

Red

ORANGE

28

RED

Blue

GREEN

68

GREEN

Red

GREEN

108

GREY

Red

GREEN

29

RED

Blue

BROWN

69

GREEN

Red

BROWN

109

GREY

Red

BROWN

30

RED

Blue

GREY

70

GREEN

Red

GREY

110

GREY

Red

GREY

31

BLUE

Black

BLUE

71

GREEN

Black

BLUE

111

GREY

Black

BLUE

32

BLUE

Black

ORANGE

72

GREEN

Black

ORANGE

112

GREY

Black

ORANGE

33

BLUE

Black

GREEN

73

GREEN

Black

GREEN

113

GREY

Black

GREEN

34

BLUE

Black

BROWN

74

GREEN

Black

BROWN

114

GREY

Black

BROWN

35

BLUE

Black

GREY

75

GREEN

Black

GREY

115

GREY

Black

GREY

36

YELLOW

Blue

BLUE

76

YELLOW

Green

BLUE

116

YELLOW

Grey

BLUE

37

YELLOW

Blue

ORANGE

77

YELLOW

Green

ORANGE

117

YELLOW

Grey

ORANGE

38

YELLOW

Blue

GREEN

78

YELLOW

Green

GREEN

118

YELLOW

Grey

GREEN

39

YELLOW

Blue

BROWN

79

YELLOW

Green

BROWN

119

YELLOW

Grey

BROWN

40

YELLOW

Blue

GREY

80

YELLOW

Green

GREY

120

YELLOW

Grey

GREY

Note 1: In each triple there shall be a c-wire, coloured Turquoise.
Note 2: Uppercase letters indicate the base, solid colour of insulation, and the lower case indicates ink bands applied onto the base colour.

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