Telephone Cables

Indoor Telephone Cables

Indoor/Outdoor Telephone Cables

Special Telephone Cables

Ordering Information

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
Pair Size	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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