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Manual Functional Integrity

Circuit Integrity of Fire Safety Cabling Systems

pdf [5 MB]
Datwyler System Circuit Integrity E30 – E60 / E90 cabling

in accordance with DIN 4102-12:
A short overview of products and installation / laying techniques

pdf [709 KB]
The most important test procedures and their functions

Update: fire behaviour and fire performance of cables

pdf [1 MB]
Product features and pictograms

Update: fire behaviour and fire performance of cables

pdf [986 KB]
Construction Products Regulation (CPR): Clear Labelling of Cable Fire Safety Classes

From 1 July 2017 only cables with classified fire behaviour may be put on the European market…

pdf [1 MB]
Regulamentação de produtos de construção

O impacto na utilização dos cabos de energia, controlo e comunicação em edifícios
(versão portuguesa, 2013/2014)

pdf [1 MB]
(N)HXH / (N)HXCH Keram E30-E60

Certificate No. P-MPA-E-03-043 (German language)

pdf [3 MB]
(N)HXH / (N)HXCH Keram E90

Certificate No. P-MPA-E-04-019 (German language)

pdf [12 MB]

Ogólne świadectwo kontroli nadzoru budowlanego
Nr świadectwa kontroli P- MPA- E- 04-019 (Polish language)

zip [4 MB]
JE-H(St)H / JE-H(St)HRH…E30-E90

Certificate No. P-MPA-E-06-030 (German language)

pdf [3 MB]
VAD 3 connection/terminal box E30-E90

Certificate No. P-MPA-E-18-009 (German language)

pdf [3 MB]
Enhanced fire resistant cable

BS 5839-1:2013 26.2(e) utilising BS 7629-1:2015,
tested to BS EN 50200:2015 (PH 120), to BS 8434-2:2003 & A2:2009 and to BS 6387:2013 CWZ
1.5 to 2.5 mm²; 2-core to 4-core
Certificate No: 153/001/042

pdf [494 KB]
Enhanced fire resistant cable

I.S. 3218:2013 utilising BS 7629-1:2008,
tested to IS EN 50200:2006 (PH 120) and to BS 8434-2:2003 & A2:2009
1.5 to 2.5 mm²; 2-core to 4-core
Certificate No: 153/001/045

pdf [493 KB]
DFS ST / Standard (218)

BS 5839-1:2013 26.2(d) utilising BS 7629-1:2015,
tested to BS EN 50200:2015 (PH 120) and Annex E and to BS 6387:2013 CWZ
1.0 to 2.5 mm², max. 4 mm²; 2-core to 4-core, EI2 Insulation
Certificate No: 218/001/003

pdf [192 KB]
DFS ST / Standard 60

BS 7629-1:2015 (STANDARD 60), BS 6387:2013 (CWZ),
EN 50200:2015 (Class PH120) Annex E (30 mins), BS 5839-1:2013 (Clause 26.2d Standard)
2 x 1 mm² and 2/3/4 x 1.5/2.5/4 mm²
Certificate No: 172g

pdf [184 KB]
Datwyler Enhanced Fire Safety Cable

BS 7629-1:2008, BS 6387:2013 (CWZ), BS 5839-1:2013 (Clause 26.2e Enhanced)
achieved Class PH120 in accordance with (BS) EN 50200:2006
Solid and stranded conductors: 2 x 1.5 mm² and 2 x 2.5 mm²
Certificate No: 172c

pdf [183 KB]
DFS ME Fire alarm cable, 300/500V

BS EN 50200 + Annex E 30 min., PH30 to PH120, BS 6387 (CWZ)
Solid conductors: 2 x 1 up to 2 x 2.5 mm2 and 4 x 1.5 mm2
Certificate No: 172e

pdf [182 KB]

Can the following halogen-free low voltage cables be laid directly in the ground?


The types specified are manufactured according to DIN VDE 0266. DIN VDE 0266 explicitly forbids direct laying in the ground. Installation in protective conduit is permitted however, provided the formation of condensation is prevented. 

Are the following halogen-free cables and conductors, as well as cables with functional integrity UV-resistant?


UV-resistance mainly depends on the colour of the outer sheath. Cables designed for external use generally have a black outer sheath. Cables with gray, red or orange outer sheath must be protected against solar radiation, e.g. by a duct, conduit or by painting with a water-soluble outer coat. 

Can the outer sheath of one of the following halogen-free cables or conductors or a cable with functional integrity be repaired?


Halogen-free cables and conductors are repaired in the same way as PVC-insulated cables with a repair collar. Cables with functional integrity can only be repaired if the flame barrier below the outer sheath (binding or filler) is completely undamaged. In general, however, a halogen-free repair collar should likewise be used. 

Is the fire load of a halogen-free cable, conductor or a cable with functional integrity higher than those insulated with PVC?


According to VDE or VDS table yes, but every manufacturer of halogen-free cables and conductors and cables with functional integrity has its “own” mixture and therefore differing fire load values. Halogen-free Datwyler safety cables and conductors, as well as cables with functional integrity have up to 50 % lower fire load than comparable halogen-free cables, conductors and cables with functional integrity or PVC insulated cables and conductors. 

What is the bending radius of a halogen-free cable and conductor or cable with functional integrity?

            according to DIN VDE 0298-3:
4 x outer diameter  
N2XH/CH, (N)HXH/CH E30-E60 / E90:
according to DIN VDE 0276-604:
15 x outer diameter (solid conductors)
12 x outer diameter (stranded conductors)
according to ABP:
15 x outer diameter (E30 / E60 / E90)
J-H(St)H, JE-H(St)H E30 L / E30-E90:
according to DIN VDE 0891-5:
7,5 x outer diameter
(N)HXSLHXÖ up to 12 mm:
(N)HXSLHXÖ more than 12 mm:
(N)HXSLHXÖ up to 8 mm:
(N)HXSLHXÖ more than 8 -12 mm:
(N)HXSLHXÖ more than12 mm:
3 x outer diameter at fixed installation
4 x outer diameter at fixed installation by bending only once
2 x outer diameter at fixed installation
3 x outer diameter at fixed installation
4 x outer diameter at fixed installation

The prerequisite here is that the cable is bent evenly without any kinks. 

What is the tensile strength of a halogen-free cable and conductor or cable with functional integrity? 

            according to DIN VDE 0298-3:
50 N/mm² copper cross-section  
N2XH/CH, (N)HXH/CH E30-E60 / E90:
according to DIN VDE 0276-604:
50 N/mm² copper cross-section
J-H(St)H, JE-H(St)H E30 L / E30-E90:
according to DIN VDE 0891-5:
depending on the number of cores, suspended length
and temperature  

What is the max. permissible operating temperature of the conductor in a halogen-free cable or in a cable with functional integrity?

      acc. to Datwyler spec.:
      -25°C to +50°C (mobile state)
-45°C to +90°C (fixed state)
NHXMH, H07Z-U/R, H05 /H07 Z-K:
acc. to DIN VDE 0298-3:
+05°C to +50°C (mobile state)
-40°C to +70°C (fixed state)
E30-E60 / E90:
acc. to DIN VDE 0276-604:
acc. to Datwyler spec.: 
-05°C to +50°C (mobile state)
-45°C to +90°C (fixed state)
Datwyler Keram FE 180/E30-CL:
 acc. to Datwyler spec.: 
-05°C to +50°C (mobile state)
-45°C to +90°C (fixed state)
J-H(St)H, JE-H(St)H
E30 L / E30-E90
acc. to DIN VDE 0891-5: 
-05°C to +50°C (mobile state)
-30°C to +70°C (fixed state)

The temperatures in the “mobile state” must be considered installation temperatures. These temperatures apply to the cable itself and not to the surroundings. If cables have a lower temperature than that permissible, they should be heated. It should be ensured that the cable temperature does not fall below the permissible temperature throughout the entire installation. 

Why is it possible that a cable terminal of the same cross-section as a core is too large for this?

According to DIN VDE 0295 the cross-section of a core is calculated from its resistance. Based on the manufacturing techniques of some manufacturers it is possible with multi-wire construction to compress the copper or form the circular conductor as sector conductor. This makes the cable more round and the external diameter (as well as the core diameter) smaller. There are reducing pieces for the cable terminal, which compensate for this difference. 

How do Datwyler safety cables behave in tunnels or underground parkings?

J-H(St)H, NHXMH, N2XH/CH, FE5-CL, FE180 E30 CL, JE-H(St)H E30-E90, NHXH/CH E30-E60, NHXH/CH E90

In complying with the following additional conditions the function of our halogen-free cables and conductors is not affected or impaired by the influence of water or water with salt (de-icing salt) or “acids” from vehicle exhaust gases: 
• No damage to cable sheath
• Water cannot influence the cable in the longitudinal direction
• The cables must be installed protected (e.g. in an enclosed concrete duct with sand bed, so that the cables are not permanently surrounded by water or in pipe systems from where water can drain).

In addition, the function of the cables can be guaranteed without problems for storage in the following media and under the following conditions:
• Storage at almost 100% relative humidity
• Immersed in water in the temperature range “+5°C to max. +50°C”. 

Table of material resistances at room temperature:

Material       Resistance at +23°C
5% – 30% formaldehyde:short-term: good to very good 
5% – 30% acetic acid:short-term: good to very good
Methanol: short-term: good to very good
20% soda solution:short-term: good to very good
NACl 10% common salt solution:good
Javel water 3%:conditional to good
Ammonia (gaseous / aqueous):moderate to good, the material is not destroyed
Hydrocarbon:short-term: conditional to moderate
Water resistance (water bath
storage at 70°C):
Water resistance (water bath
storage at room temperature):
good to very good 
Storage at almost 100% umidity:very good

May heavy current cables be installed with light current cables?

From the fire protection point of view: yes. But the relevant DIN VDE for the corresponding application should always be considered. 

May safety cables be painted?

Datwyler fire safety cables may be provided with a solvent-free coat of paint. It is advisable, however, to consult acceptance authorities beforehand concerning qualifications. 

Is it permissible to install safety cables directly in concrete?

According to DIN VDE 0276 Part 604 Appendix A Section 3.1 (contains regulations pertaining to the application areas for low voltage cables with improved fire properties), safety cables may installed indoors, in the air or embedded in concrete. According to HD 604 Part 5 Section 5.1.2, the cables also have to be protected against mechanical damage.

Functional integrity can only be achieved as part of a “non-essential deviation” if the cable has a functional integrity approval for the installation under plaster. 

Functional integrity under plaster or in concrete?

NHXH E30/NHXCH E30 and NHXH E90/NHXCH E90 may be installed indoors, in the air or in concrete (DIN VDE 0276 Part 604 Annex A Section 3.1). However, the cables must be protected against mechanical damage.

The laying in concrete can only be deduced within the scope of a “non-significant deviation” if the cable has a functional integrity approval for the installation under plaster.

The installation under plaster or in concrete does not per se constitute a measure of the functional integrity.

Is the C-conductor of a concentric cable a screen?

The concentric conductor in N2XCH/NHXCH E30 and NHXCH E90 cables is not a screen in the normal sense and therefore not comparable with telecommunications or data technology. It only has a slight screening effect. The concentric conductor is specified in DIN VDE 0276 part 604 section 5 point 3.3.5. 

Can halogen-free cables and conductors be jointed?

Halogen-free cables and conductors can be jointed exactly the same as PVC-insulated cables and conductors. A halogen-free joint should be used however. 

Can halogen-free cables and conductors be connected to PVC-insulated cables?

From the electrical point of view: yes. But one requirement for halogen-free cabling according to DIN VDE 0482-267 is not satisfied. A low fire propagation capacity according to DIN VDE 0482-266 and a minimum smoke production to DIN VDE 0482-1034 are no longer guaranteed. 

Must halogen-free cables and conductors be specially installed
(and therefore need more work time and expense)?

No. Halogen-free cables and conductors are laid in the same way as PVC-insulated cables. Halogen-free fixing material should be used however. 

What are the advantages of halogen-free cables?

In the event of fire no corrosive gases are produced to cause significant damage to humans and structures. No hydrogen chloride gas is produced, which combines with water to form hydrochloric acid. The proportion of toxic gases is reduced to a minimum, i.e. no irritation of the mucous membranes and eyes (according to test class DIN VDE 0482-267).
Halogen-free cables do not burn easily and possess a low fire propagation factor, so there is no dreaded fuse effect to test class DIN VDE 0482-266-2-4 cat. C).
Since there is little production of smoke, the escape and rescue routes remain clear for persons to escape and provide access for the fire service (to test class DIN VDE 0482-1034). 

What does NHMH mean or halogen-free cables without improved behaviour in event of fire?

In contrast with NHXMH, an NHMH is not tested to DIN VDE 0482-266-2-4 cat. C, but only to test class B. This is the corresponding test for low fire propagation capacity. The danger with this type of cable lies in the fuse effect. 

What is the difference between flame-resistance and low fire propagation or what is the meaning of improved behaviour in the event of fire?

Flame-resistance of a cable means that the cable extinguishes itself if the source of the fire is removed after 1 min (DIN VDE 0482-332-1-2). This test does not conform with practice, but is a laboratory test. For a cable this test condition is not a requirement and has no reference at all to the actual fire behaviour.
A low fire propagation factor, however, means that no further propagation of the fire is possible even after 20 mins. (DIN VDE 0482-266-2-4 cat. C). 

May halogen-free cables be laid together with PVC-insulated cables?

There is no DIN VDE which restricts this, provided it only concerns a common installation of pure halogen-free cables and conductors with PVC-insulated cables. 

What is the meaning of functional integrity E30 and E90?

This means retention of function as tested according to DIN 4102-12. A complete system is always tested, i.e. a cable can only have functional integrity if it includes the installation system. The cable or laying system alone has no functional integrity. In addition, approved dowels and screws must also be used. 

What are the regulations for vertical installation?

According to DIN 4102 part 12 sections 8.2 and 8.3 the same classification applies to vertical cable systems as for individual laying on the ceiling with individual clamps. A tested stirrup clamp (with fixing spacing of individual clamps) can be used alternatively for fixing. 

May cables with functional integrity be used again following a fire?

All safety cables must be replaced following any exposure to fire. The cable system with functional integrity must be accepted again by experts. 

May cables with functional integrity be laid together with halogen-free cables or PVC-insulated cables?

In principle, functional integrity cables must not be laid with other conductors. According to DIN VDE 0108 section 6.7 there are special cases for common installation. It is recommended to consult the accepting agent before making the installation. 

What happens when cables with functional integrity are exposed to water under pressure in the case of fire (sprinkler system)?

Datwyler safety cables NHXH/NHXCH E90 Keram have been tested according to VdS procedure guideline 2344 (1999-02) for this application and have the corresponding VDS approval. 

Are functional integrity cables suitable for continuous ambient temperatures > 100°C?

No. Cables with functional integrity are not silicone cables and so cannot be compared with them. The permissible service temperature in the rest condition for a conductor in an NHXH/NHXCH E30 and E90 is -15°C to + 90°C and for a JE-H(St)H E30-E90 -30°C to +70°C. 

How must functional integrity cables be secured with vertical installation over several floors?

According to DIN 4102 part 12 it is necessary to secure the cables for this form of installation at intervals of max. 3500 mm, e.g. meandering form of installation, accommodated in ceiling partitions S90 or clamps. 

What does ABP mean?

ABP is the abbreviation for “Allgemeines bauaufsichtliches Prüfzeugnis” and means “General building supervisory test certificate” or “General appraisal certificate”. Where functional integrity is required by regulation, only safety cabling systems with an ABP may be used. Otherwise the specific agreement and approval from the local building regulation authority is required. 

What is the meaning of a “G Number” in context with functional integrity?

According to the “VdS guideline for sprinkler systems VdS 2092 section 5.5.1 f)” cables used for the power supply of sprinkler pumps must be additionally tested against impact of water during a fire (VdS guideline 2344). Upon successful completion of such a test, the cable will be marked with a recognition number starting with an “G”.
Datwyler NHXH Keram E90 is marked with G-4070050,
Datwyler NHXCH Keram E90 is marked with G-4980024. 

What is the proper method of installing vertical lines of cables with functional integrity that extend across multiple storeys?

Meander-shaped installation or effective supportmount?

According to DIN 4102-12 Section 8.3, the classification of functional integrity only applies when effective supportmounts (spacing ≤ 3.500mm) are installed for the cables. An example of an effective support mount is shown there in figure 5. An other method is to use an appropriately classified ceiling fire bulkhead or a tested and certified clip construction. Only authorised test institutes are permitted to evaluate mount designs that differ from the one shown in figure 5. Figure 5 displays a meander-shaped cable installation, with the cable system leading horizontally every 3,500 mm and fastened by two clips at a spacing of max. 300 mm. The cable must run for at least 300 mm in the horizontal direction. The bending radii must be included in the calculation. Using Datwyler WUM (effective support mounts), it is possible to eliminate the need for the horizontal cable routing since this has been certified by a recognisedtest institute.

Installation using only single or bracket clips According to DIN 4102 -12 Section 8.3, the only test results that apply to vertical cable systems are those for separately installed cables on ceilings using single clips. A certified bracket clip can be used as alternative means of fastening the cables.The spacing of the bracket clips is the same as the spacing used to install cables separately using single clips (Using standard installationtechniques, this corresponds to a fastener spacing of 300 mm). Using Datwyler SAS single clips or bracket clips of type B to D, it is possible to achieve fastener spacings of up to 1.2 m with bundled cable weights of up to 2.5 kg/m. For more information, refer to our “Optional InstallationTechniques”.