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Firetuf 300/500V Multicore

Solid Conductor Type (Class 1 to BS 6360)

Cable Ref

Insulated Phase Cores

Protective Earth Conductor

Nominal Sheath thickness
mm

Nominal Overall Diameter
mm

Approx. Nett weight
mm

Resistance
W/km

No. of Cores

Conductor

Nominal Insulation Thickness
mm

CSA
mm2

Strand No/mm

CSA
mm2

Strand No/mm

FTZ 2E 1.0

2

1.0

1/1.13

0.6

1.0

1/1.13

0.9

7.0

83

18.10

FTZ 3E 1.0

3

1.0

1/1.13

0.6

1.0

1/1.13

0.9

7.3

95

18.10

FTZ 4E 1.0

4

1.0

1/1.13

0.6

1.0

1/1.13

1.0

8.2

115

18.10

FTZ 7E 1.0

7

1.0

1/1.13

0.6

1.0

32/0.2

1.0

10.5

175

18.10

FTZ 12E 1.0

12

1.0

1/1.13

0.6

1.0

32/0.2

1.1

13.5

275

18.10

FTZ 19E 1.0

19

1.0

1/1.13

0.6

1.0

32/0.2

1.2

15.7

405

18.10

FTZ 2E 1.5

2

1.5

1/1.38

0.7

1.5

1/1.38

0.9

7.9

110

12.10

FTZ 3E 1.5

3

1.5

1/1.38

0.7

1.5

1/1.38

0.9

8.3

128

12.10

FTZ 4E 1.5

4

1.5

1/1.38

0.7

1.5

1/1.38

1.0

9.5

160

12.10

FTZ 7E 1.5

7

1.5

1/1.38

0.7

1.5

30/0.25

1.1

12.2

250

12.10

FTZ 12E 1.5

12

1.5

1/1.38

0.7

1.5

30/0.25

1.2

15.7

390

12.10

FTZ 19E 1.5

19

1.5

1/1.38

0.7

1.5

30/0.25

1.3

18.2

560

12.10

 

 

 

 

 

 

 

 

 

 

 

FTZ 2E 2.5

2

2.5

1/1.78

0.8

2.5

1/1.78

1.0

9.3

160

7.41

FTZ 3E 2.5

3

2.5

1/1.78

0.8

2.5

1/1.78

1.0

9.9

190

7.41

FTZ 4E 2.5

4

2.5

1/1.78

0.8

2.5

1/1.78

1.1

11.3

235

7.41

FTZ 7E 2.5

7

2.5

1/1.78

0.8

2.5

50/0.25

1.2

14.6

375

7.41

FTZ 12E 2.5

12

2.5

1/1.78

0.8

2.5

50/0.25

1.4

19.5

610

7.41

FTZ 19E 2.5

19

2.5

1/1.78

0.8

2.5

50/0.25

1.5

22.8

900

7.41


Stranded Conductor Type (Class 2 to BS 6360)

Cable Ref

Insulated Phase Cores

Protective Earth Conductor

Nominal Sheath thickness mm

Nominal Overall Diameter mm

Aprox. Nett weight kg/km

Resistance
W/km

No. of Cores

Conductor

Nominal Insulation Thickness

CSA
mm2

Strand No/mm

CSA
mm2

Strand No/mm

FTZ 2E7 1.0

2

1.0

7/0.44

0.6

1.0

7/0.44

0.9

7.2

90

18.10

FTZ 3E7 1.0

3

1.0

7/0.44

0.6

1.0

7/0.44

0.9

7.5

102

18.10

FTZ 4E7 1.0

4

1.0

7/0.44

0.6

1.0

7/0.44

1.0

8.8

125

18.10

FTZ 7E7 1.0

7

1.0

7/0.44

0.6

1.0

32/0.2

1.0

11.3

190

18.10

FTZ 12E7 1.0

12

1.0

7/0.44

0.6

1.0

32/0.2

1.1

14.5

295

18.10

FTZ 19E7 1.0

19

1.0

7/0.44

0.6

1.0

32/0.2

1.2

16.9

430

18.10

 

 

 

 

 

 

 

 

 

 

 

FTZ 2E7 1.5

2

1.5

7/0.53

0.7

1.5

7/0.53

0.9

8.4

125

12.10

FTZ 3E7 1.5

3

1.5

7/0.53

0.7

1.5

7/0.53

0.9

8.9

142

12.10

FTZ 4E7 1.5

4

1.5

7/0.53

0.7

1.5

7/0.53

1.0

10.2

177

12.10

FTZ 7E7 1.5

7

1.5

7/0.53

0.7

1.5

30/0.25

1.1

12.9

275

12.10

FTZ 12E7 1.5

12

1.5

7/0.53

0.7

1.5

30/0.25

1.2

16.7

427

12.10

FTZ 19E7 1.5

19

1.5

7/0.53

0.7

1.5

30/0.25

1.3

19.4

617

12.10

 

 

 

 

 

 

 

 

 

 

 

FTZ 2E7 2.5

2

2.5

7.0.67

0.8

2.5

7.0.67

1.0

9.7

175

7.41

FTZ 3E7 2.5

3

2.5

7.0.67

0.8

2.5

7.0.67

1.0

10.6

210

7.41

FTZ 4E7 2.5

4

2.5

7.0.67

0.8

2.5

7.0.67

1.1

12.3

265

7.41

FTZ 7E7 2.5

7

2.5

7.0.67

0.8

2.5

50/0.25

1.2

15.0

400

7.41

FTZ 12E7 2.5

12

2.5

7.0.67

0.8

2.5

50/0.25

1.4

19.8

640

7.41

FTZ 19E7 2.5

19

2.5

7.0.67

0.8

2.5

50/0.25

1.5

21.3

930

7.41

 

 

 

 

 

 

 

 

 

 

 

FTZ 2E7 4.0

2

4.0

7/0.85

0.8

4.0

7/0.85

1.1

11.1

243

4.61

FTZ 3E7 4.0

3

4.0

7/0.85

0.8

4.0

7/0.85

1.1

12.2

297

4.61

FTZ 4E7 4.0

4

4.0

7/0.85

0.8

4.0

7/0.85

1.2

13.8

365

4.61

 

 

 

 

 

 

 

 

 

 

 

FTZ 2E7 6.0

2

6.0

7/1.04

0.8

6.0

7/1.04

1.2

12.4

330

3.08

FTZ 3E7 6.0

3

6.0

7/1.04

0.8

6.0

7/1.04

1.3

14.5

415

3.08

FTZ 4E7 6.0

4

6.0

7/1.04

0.8

6.0

7/1.04

1.3

14.8

485

3.08

 

COLOUR CODING:

For 7, 12 and 19 core cables colour coding will be by reference and marker

2 Core

Red/Black

7 Core

Centre
1st Layer

Red
Red, 4 Black & Blue

3 Core

Red/ Yellow / Blue

12 Core

Centre
1st Layer

Red, Black & Blue
Red, 7 Black & Blue

4 Core

Red / Yellow / Blue / Black

19 Core

Centre
1st Layer
2nd Layer

Red
Red, 4 Black & Blue
Red, 10 Black & Blue

 

Multipair 300/500V

Cable Ref

Insulated Phase Cores

Drainwire

Nominal Sheath thickness
mm

Nominal Overall Diameter
mm

Aprox. Nett weight
kg/km

No. of Pairs

Conductor

Nominal Insulation Thickness
mm

CSA
mm2

Strand No/mm

CSA
mm2

Strand No/mm

FTZ 2P 1.0

2 (quad)

1.0

32/0.2

0.6

0.5

16/0.2

1.0

9.3

130

FTZ 5P 1.0

5

1.0

32/0.2

0.6

0.5

16/0.2

1.2

15.3

300

FTZ 10P 1.0

10

1.0

32/0.2

0.6

0.5

16/0.2

1.4

20.2

510

FTZ 15P 1.0

15

1.0

32/0.2

0.6

0.5

16/0.2

1.5

23.3

705

FTZ 20P 1.0

20

1.0

32/0.2

0.6

0.5

16/0.2

1.6

26.6

880

 

 

 

 

 

 

 

 

 

 

FTZ 2P 1.5

2 (quad)

1.5

30/0.25

0.7

0.5

16/0.2

1.0

10.4

165

FTZ 5P 1.5

5

1.5

30/0.25

0.7

0.5

16/0.2

1.3

18.4

440

FTZ 10P 1.5

10

1.5

30/0.25

0.7

0.5

16/0.2

1.5

23.6

700

FTZ 15P 1.5

15

1.5

30/0.25

0.7

0.5

16/0.2

1.7

27.5

965

FTZ 20P 1.5

20

1.5

30/0.25

0.7

0.5

16/0.2

1.8

31.4

1250

 

 

 

 

 

 

 

 

 

 

FTZ 2P 2.5

2 (quad)

2.5

50/0.25

0.8

0.5

16/0.2

1.2

12.3

245

FTZ 5P 2.5

5

2.5

50/0.25

0.8

0.5

16/0.2

1.4

21.8

585

FTZ 10P 2.5

10

2.5

50/0.25

0.8

0.5

16/0.2

1.7

27.9

1010

FTZ 15P 2.5

15

2.5

50/0.25

0.8

0.5

16/0.2

1.9

32.5

1420

FTZ 20P 2.5

20

2.5

50/0.25

0.8

0.5

16/0.2

2.0

34.1

1820

 

COLOUR CODING:

Pairs are Red, Black and individually numbered.

Alternative colour coding is available on request.

Cables in this range can also be supplied with steel wire armour protection.
Single pair Firetuf cables are also available. For technical details, refer to the multicore solid or stranded data tables above.

 

Screening

The use of helical aluminium tape closely wrapped around the insulating cores gives improved screening, resulting in improved security from external interference, as indicated by testing to IEC 801-6 (DRAFT) 1990, Direct Voltage Injection Method.

Over the frequency range 1-100MHz, attenuation improvement of 30-35dB is achieved over unscreened cable.

 

 


Capacitance

Firetuf cables have a much lower core to core and core to screen
capacitance than other conventional fire resistant cables.

The growth of systems allowing longer cable runs makes Firetuf ideal
for fire alarm circuits where low capacitance is vital. Typical mutual
and earth capacitance figures for each conductor size are as follows:


Phase Conductor CSA (mm2)
Capacitance Core-Core (pF/metre)
Capacitance Core-Screen (pF/metre)

1.0

100

175

1.5

102

180

2.5

115

205

4.0

125

230

6.0

140

260


Current Ratings and Associated Voltage Drop
BS 7629 limits maximum conductor temperature (unless enclosed) to 70C. Where 90C is permitted refer to IEE wiring regulations.

Phase conductor CSA
mm2

Reference Method 1* (Clipped Direct)

Reference Method 3* (enclosed)

one twin cable with protective conductor single phase ac or dc

one 3 or 4 core cable with protective conductor, 3 phase

one twin cable with protective conductor single phase ac or dc

one 3 or 4 core cable with protective conductor, 3 phase

current rating
A

volt drop per amp per metre
mV

current rating
A

volt drop per amp per metre
mV

current rating
A

volt drop per amp per metre
mV

current rating
A

volt drop per amp per metre
mV

1.0

15

44

13.5

38

13.5

44

11.5

38

1.5

19.5

29

17.5

25

16.5

29

15

25

2.5

27

18

24

15

23

18

20

15

4.0

36

11

32

9.5

30

11

27

9.5

6.0

46

7.3

41

6.4

38

7.3

34

6.4

*As defined in Appendix 4 of BS 7671, the IEE Wiring Regulations,
16th Edition. Conductor operating temperature: 70C. Ambient temperature: 30C.

 

Rating Factors

Conductor operating temperature 70C

For ambient temperature - overload protection by a fuse to BS 88 or BS 1371.

Ambient temp. (C)

Rating factor

25


1.03

30


1.00

35


0.94

40


0.87

45


0.79

50


0.71

55


0.61

60


0.50

65


0.35

For grouping

Number of cables

Rating factor

2


0.80

3


0.70

4


0.65

5


0.60

6


0.57

8


0.52

10


0.48

12


0.45

14


0.43

16


0.41

18


0.39

20


0.38

 

 

L/R Ratio

mm2

H/W

1.0

25

1.5

40

2.5

50

4.0

65

6.0

90