Fire Resistant Power Cable

Comparison Dimensions

EN/IEC

UL/NEC

Core Standards System

EN 50200 (Fire resistance of emergency circuits)

IEC 60331 (Fire resistance performance)

IEC 60754 (Halogen acid gas release)

IEC 61034 (Smoke density)

EN 50363 (Low smoke halogen-free materials)

CPR Regulation (EN 50575)

UL 2196 (Fire-resistant cable)

UL 1685 (Flame-retardant bundled cable)

UL 910 (CMP ventilation zone)

UL 1666 (CMR shaft)

NEC Article 725 (Classification of communication cables)

Testing Methods

Smoke Toxicity and Material Requirements

- Bundle combustion: EN 60332-3-24 (Class C), 3.5m specimen, 750℃ propane flame, 20 minutes, char height ≤ 2.5m.

- Bundled flame retardancy: UL 1685 (vertical tray), 244cm specimen, flame temperature approximately 840℃, 20 minutes, char height ≤ 244cm, peak smoke density ≤ 0.15 m⁻¹

- Fire resistance test: IEC 60331, powered for ≥90 minutes under a 750°C flame, with mechanical impact and water spray.

- Fire resistance test: UL 2196, powered for ≥180 minutes under a 950℃ flame without mechanical impact.

- Smoke toxicity: IEC 60754-1 (HCl release ≤5%), IEC 61034-2 (light transmittance ≥60%)

- Flame retardancy rating: UL 910 (CMP, average smoke density ≤0.15, peak ≤0.5); UL 1666 (CMR, no smoke density requirement)

Core Standards System

Mandatory low-smoke halogen-free, halogen acid gas release ≤5%, smoke density and light transmittance ≥60%, CPR regulations require A1~F classification, and high-halogen materials are prohibited.

There are no mandatory low-halogen requirements, but CMP-grade certification requires low smoke (peak smoke density ≤ 0.5). Materials are mostly PVC or contain halogenated flame retardants. UL certification can be labeled "-HF".

Testing Methods

- Flame retardants: ZR-YJV, WDZB-YJY

- Flame retardants: CMP(OFNP),CMR(OFNR),CM(OFN)

- Refractory: NH-YJV,NH-BV

- Refractory: UL 2196

- Mineral insulation: BTTZ,RTTZ

- Flexible minerals: YTTW

Application Scenarios

Recommended Types

Reasons

Ordinary residential/office buildings

Flame-retardant, low-smoke, halogen-free cable

Controls smoke density, facilitates personnel evacuation, and has a moderate cost.

Power supply circuits for fire protection equipment

Fire-resistant cable (NH type)

Requires continuous power supply during fires to ensure the operation of the fire protection system.

Underground utility tunnels, damp environments

Armored fire-resistant cable with waterproof sheath

Resistant to mechanical damage, moisture-proof, and corrosion-resistant.

Main power lines in high-rise buildings

Flexible mineral-insulated cable

Highly fire-resistant, easy to construct, and suitable for vertical installation.

Extremely high temperature or explosion-proof areas

BTTZ

All-copper structure, withstanding temperatures up to 1083℃, suitable for critical areas.

Nominal cross section
mm2

Insulation nominal thickness
mm

The resistance of a conductor at 20℃ is no greater than
Ω/km

Metal sheath thickness(mm)

Calculated resistance value of copper sheath at 20℃Ω/km

Cable outer diameter(mm)

1 core

2 cores

3

core

4cores

1cores

2cores

3cores

4cores

1cores

2cores

3cores

4cores

1

0.8

18.1

0.4

0.5

0.5

0.5

4.63

2.20

0.28

1.90

3.53

5.66

5.96

6.46

1.5

0.8

12.1

0.4

0.5

0.5

0.5

4.19

2.00

1.89

1.73

3.78

6.16

6.50

7.06

2.5

0.8

7.41

0.4

0.5

0.6

0.6

3.75

1.75

1.36

1.24

4.18

6.96

7.56

8.23

4

0.8

4.61

0.5

0.6

0.6

0.6

2.61

1.26

1.18

1.08

4.85

8.10

8.57

9.36

6

0.8

3.08

0.5

0.6

0.6

0.6

2.33

1.11

1.04

0.945

5.36

9.12

9.67

10.59

10

1.0

1.83

0.5

0.7

0.7

0.7

1.74

0.689

0.646

0.586

7.02

12.44

13.22

14.52

16

1.0

1.15

0.6

0.7

0.7

0.8

1.19

0.570

0.55

0.432

8.24

14.48

15.42

17.18

25

1.0

0.727

0.6

0.8

0.8

0.9

1.05

0.429

0.401

0.32

9.56

17.32

18.46

20.57

35

1.0

0.524

0.6

0.8

0.8

1.0

0.935

0.377

0.141

0.28

10.90

19.90

21.43

23.86

50

1.2

0.387

0.7

0.9

0.9

1.0

0.68

0.285

0.266

0.215

12.60

23.00

24.55

27.34

70

1.2

0.268

0.7

1.0

1.0

1.0

0.591

0.22

0.205

0.185

14.40

23.80

28.63

31.69

95

1.2

0.193

0.8

1.0

1.0

1.0

0.451

0.191

1.79

0.161

16.50

30.60

32.72

36.72

120

1.4

0.153

0.8

1.0

1.0

1.1

0.408

0.172

0.161

0.131

18.14

33.88

36.26

40.43

150

1.4

0.124

0.8

1.0

1.0

1.1

0.366

0.154

0.131

0.117

20.15

37.70

40.56

45.00

185

1.4

0.0991

0.9

1

1

1.2

0.297

0.141

0.119

0.098

22.10

41.20

44.33

49.42

240

1.4

0.0754

0.9

1

1

1.2

0.263

0.124

0.104

0.086

24.69

46.38

50.22

55.83

300

1.6

0.0601

1

-

-

-

0.212

-

-

-

27.70

-

-

-

400

1.6

0.0470

1

-

-

-

0.193

-

-

-

30.40

-

-

-