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  • Tunnels are fascinating structures. In such a complex microcosm, the requirements with respect to the technical configuration are extremely high. Safety is of utmost priority.
    TUNNELS

    Space for
    Security

    Tunnels are fascinating structures. In such a complex microcosm, the requirements with respect to the technical configuration are extremely high. Safety is of utmost priority.

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Overview

The experts in tunnel building:
Spelsberg

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Spelsberg: the experts in tunnel construction
  • Maintained electrical function in case of fire for classes E30 to E90 according to DIN 4102 Part 12
  • Rugged installation materials in industrial quality
  • Weatherproof
  • Shockproof
  • Protection rating up to IP 68
  • Pressure and suction resistance tested according to "Tunnel safety lighting for railway tunnels" test
  • Certified products with VDE seal, general building authority approval (AbZ) and general building authority test certificates (AbP)

Safety in motorway tunnels

In the 3,300-metre-long Gubrist tunnel, fireproof junction boxes from Spelsberg ensure that vital systems continue to work in case of fire. 

Case Studies Tunnels

Tunnel safety in practice
Safety under the most unfavourable conditions

The 3,300-metre-long Gubrist tunnel is part of Zurich's north bypass, one of the busiest stretches of motorway in Switzerland. The stringent safety requirements for electrical installation systems are a particular challenge here.

Were an accident to result in fire, vital equipment such as emergency lighting, ventilation systems and rescue equipment would have to remain available.
This is assured by the WKE 54 fireproof junction box from Spelsberg with its especially high protection rating of IP 67. It was developed especially for tunnels and is made of rugged duroplastic and protected against entry of foreign objects and moisture. The WKE 54 is also an important element of safety plans for railway tunnels. Its pressure and suction resistance has been confirmed by the "Tunnel safety lighting for railway tunnels" test.

Intelligent solutions for large-scale tunnel projects

The first inner-city drilled tunnel in the Netherlands runs some 30 metres beneath Rotterdam. Its tubes, 2.4 kilometres long, are part of the "RandstadRail" local transport system.

At this considerable depth, the WKE 54 fireproof junction boxes with their especially high protection rating of IP 67 ensure reliable current flow. In addition to their maximum maintenance of electrical function, these boxes made from special duroplastic and specially developed for tunnels maintain insulation for 180 minutes and can function for 120 minutes at a temperature of 400 degrees Celsius.
The WKE 54 is also an important element of safety plans for train tunnels. Its pressure and suction resistance has been confirmed by the "Tunnel safety lighting for railway tunnels" test.

Safely through the heart of Berlin

The U55 underground line travels through the centre of Berlin underneath the government district. Around the clock, 365 days a year. The 1.8-kilometre-long tubes used here set the benchmark in terms of both design and technical standards. Fireproof junction boxes with fused branches from Spelsberg protect the electrical wiring systems.

The WKE 300 BVG and WKE 400 BVG junction boxes developed specially for the Berlin Verkehrsbetriebe (Berlin transport companies) are made from an especially rugged, halogen-free and self-extinguishing duroplastic. They maintain operation of the lighting and evacuation equipment for at least 30 minutes in case of fire. In addition, junction boxes in the Abox-i series from Spelsberg protect the electronics from penetration by liquids and dust. They are flame-resistant, impact-resistant and shatterproof and can withstand even extreme temperatures between -35 and 75 degrees Celsius.

WKE 54
Junction box for tunnel customizable
WKE 54

278 x 208 x 107 mm
Article number: 86025401

to be used as a junction box with fused branch, Connection box 5-pole 1.5 - 16 mm², Junction box 5-pole 1.5 - 10 mm², Number of conductors per pole:, 20 x 1.5² / 16 x 2.5² / 12 x 4.0² / 8 x 6² / 4 x 10² / 4 x 16², 2 fuse bases D01 max. 16 A, {Montiertes Zubehör:}, 2 cable glands M40, Seal range 16 - 28 mm, 1 cable gland M32, seal range 11 - 21 mm

Cable junction and connection boxes with IP66 /67, certified according to EN 61439-2, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made of a high-temperature-resistant special ceramic, rapid mounting by external brackets

WKE 202 RK
Cable junction box customizable
WKE 202 RK

115 x 115 x 93 mm
Article number: 86220201

Junction box 5-pole, termination capability per pole 2 x 0.5 - 6 mm², Accessories supplied:, 2 cable glands M32, seal range 17 - 26 mm, Wall plug set ø 6 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic

WKE 204 RK
Cable junction box customizable
WKE 204 RK

115 x 115 x 93 mm
Article number: 86220401

Junction box with fused branch, Connection box 3-pole, Junction box 3-pole, {Anzahl klemmbarer Leiter pro Pol 4 x 0,5 - 4mm²}, {Klemmvermögen pro Klemmstelle 1 x 0,5 - 4mm²}, {Sicherungshalter (20 x 5mm) max. 6,3A}, Accessories supplied:, {3 St. Kabelverschraubung M25 (6-15mm)}, Wall plug set ø 6 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic, {Abzweig in Anlehnung an E30}

WKE 403 RK
Cable junction box customizable
WKE 403 RK

200 x 200 x 110 mm
Article number: 86240301

Junction box 5-pole, termination capability for each pole 4 x 4 - 16 mm², Accessories supplied:, 2 cable glands M40, seal range 17 - 27 mm, 1 cable gland M32, seal range 17 - 26 mm, Wall plug set ø 6 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic

WKE 402 RK
Cable junction box customizable
WKE 402 RK

200 x 200 x 110 mm
Article number: 86240201

Junction box 5-pole, termination capability for each pole 2 x 2.5 - 35 mm², Accessories supplied:, Wall plug set ø 6 mm, 2 cable glands M50, seal range 23 - 34 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic

WKE 203 RK
Cable junction box customizable
WKE 203 RK

115 x 115 x 93 mm
Article number: 86220301

Junction box 3-pole, termination capability for each pole 4 x 0.5 - 4 mm², Accessories supplied:, 3 cable glands M25, seal range 6 - 15 mm, Wall plug set ø 6 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic

WKE 404 RK
Cable junction box customizable
WKE 404 RK

200 x 200 x 110 mm
Article number: 86240401

Junction box with fused branch, Junction box 5-pole, {Anzahl klemmbarer Leiter pro Pol 2 x 2,5 - 35mm²}, {Klemmvermögen pro Klemmstelle 1 x 2,5 - 35mm²}, Junction box 3-pole, {Anzahl klemmbarer Leiter pro Pol 4 x 1,5 - 10mm²}, {Klemmvermögen pro Klemmstelle 1 x 1,5 - 10mm²}, {Sicherungshalter (20 x 5mm) max. 6,3A}, Accessories supplied:, Wall plug set ø 6 mm, {2 St. Kabelverschraubung M50 (23 - 34mm)}, {1 St. Kabelverschraubung M32 (17 - 26mm)}

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic

WKE 304 RK
Cable junction box customizable
WKE 304 RK

160 x 160 x 110 mm
Article number: 86230401

Junction box with fused branch, Connection box 5-pole, Junction box 3-pole, {Anzahl klemmbarer Leiter pro Pol 4 x 1,5 - 10mm²}, {Klemmvermögen pro Klemmstelle 1 x 1,5 - 10mm²}, {Sicherungshalter (20 x 5mm) max. 6,3A}, Accessories supplied:, {2 St. Kabelverschraubung M40 (17 - 27mm)}, {1 St. Kabelverschraubung M25 (6 - 15mm)}, Wall plug set ø 6 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic, {Abzweig in Anlehnung an E30}

WKE 303 RK
Cable junction box customizable
WKE 303 RK

160 x 160 x 110 mm
Article number: 86230301

Junction box 5-pole, termination capability for each pole 4 x 2.5 - 10 mm², Accessories supplied:, 3 cable glands M32, seal range 17 - 26 mm, Wall plug set ø 6 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic

WKE 302 RK
Cable junction box customizable
WKE 302 RK

160 x 160 x 110 mm
Article number: 86230201

Junction box 5-pole, termination capability for each pole 4 x 4 - 16 mm², Accessories supplied:, 2 cable glands M40, seal range 17 - 27 mm, Wall plug set ø 6 mm

Cable junction and connection box with IP66 certified acc. EN 60670, with electrical functional integrity E30 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, enclosure and terminal strips made from halogen-free special duroplastic

WKE 405 LSA
Cable junction box customizable
WKE 405 LSA

200 x 200 x 110 mm
Article number: 86240501

Junction box equipped with two LSA-Plus connector blocks, respectively for 10 double wires (2 x 10 DA), the LSA-Plus contacts are suitable for a solid conductor with 0.4 to 0.8 mm diameter and an outside insulation diameter of 0.7 to 1.6 mm. Accessories supplied: Wall plug set ø 6 mm, 4 cable glands M25, seal range 9 - 19 mm

Tested system: WKE 405 - cable junction boxes with time-saving (solder, screw and stripping free) connection technology for cables with functional integrity according to DIN 4102 Part 12 - tested by the MPA Dresden

WKE 2 - 5 x 6²
Cable junction box customizable
WKE 2 - 5 x 6²

100 x 100 x 50 mm
Article number: 86050201

Connection box 5-pole 0.5 - 6 mm², Junction box 5-pole 0.5 - 1.5 mm², Number of conductors per pole:, 8 x 0.5² / 4 x 0.75² / 6 x 1² / 6 x 1.5² / 2 x 2.5² / 2 x 4² / 2 x 6², Accessories supplied:, Drilling template, D6 wall + ceiling attachment set, 4 IP54 attachment bushes M25, seal range 9 - 18.5 mm, 1 IP54 sealing plug M25, seal range 9 - 18.5 mm

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE 4 - 5 x 16²
Cable junction box customizable
WKE 4 - 5 x 16²

165 x 165 x 76 mm
Article number: 86050401

Connection box 5-pole 1.5 - 16 mm², Number of conductors per pole:, 10 x 1.5² / 8 x 2.5² / 4 x 4² / 4 x 6² / 2 x 10² / 2 x 16², Accessories supplied:, 4 IP54 attachment bushes M40, seal range 17 - 30 mm, 1 IP54 sealing plug M40, seal range 17 - 30 mm, Drilling template, D6 wall + ceiling attachment set

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE 5 - 15 x 6²
Cable junction box customizable
WKE 5 - 15 x 6²

171 x 256 x 106 mm
Article number: 86050501

Connection box 15-pole 0.5 - 6 mm², Number of conductors per pole:, 8 x 0.5² / 4 x 0.75² / 6 x 1² / 6 x 1.5² / 2 x 2.5² / 2 x 4² / 2 x 6², Accessories supplied:, Drilling template, D6 wall + ceiling attachment set, 6 IP54 attachment bushes M20, seal range 8 - 13 mm, 2 IP54 attachment busches M40, seal range 17 - 30 mm, 2 IP54 double end connectors M40, seal range 17 - 30 mm, 1 IP54 sealing plug M20, seal range 8 - 13.5 mm, 1 IP54 sealing plug M40, seal range 17 - 30 mm

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE 4 - 8 x 6²
Cable junction box customizable
WKE 4 - 8 x 6²

165 x 165 x 76 mm
Article number: 86051401

Connection box 8-pole 0.5 - 6 mm², Number of conductors per pole:, 8 x 0.5² / 4 x 0.75² / 6 x 1² / 6 x 1.5² / 2 x 2.5² / 2 x 4² / 2 x 6², Accessories supplied:, 2 IP54 attachment bushes M40, seal range 17 - 30 mm, 2 IP54 double end connectors M40, seal range 8 - 13 mm, 1 IP54 sealing plug M20, seal range 8 - 13.5 mm, 1 IP54 sealing plug M40, seal range 17 - 30 mm, Drilling template, D6 wall + ceiling attachment set

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE 3 - 5 x 10²
Cable junction box customizable
WKE 3 - 5 x 10²

115 x 115 x 66 mm
Article number: 86050301

Connection box 5-pole 1 - 10 mm², Junction box 5-pole 1 - 4 mm², Number of conductors per pole:, 10 x 1² / 8 x 1.5² / 6 x 2.5² / 4 x 4² / 2 x 6² / 2 x 10², Accessories supplied:, Drilling template, D6 wall + ceiling attachment set, 4 IP54 attachment bushes M32, seal range 13 - 23 mm, 1 IP54 sealing plug M32, seal range 13 - 23 mm

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE 2 - 3 x 10²
Cable junction box customizable
WKE 2 - 3 x 10²

100 x 100 x 50 mm
Article number: 86051201

Connection box 3-pole 1 - 10 mm², Number of conductors per pole:, 10 x 1² / 8 x 1.5² / 6 x 2.5² / 4 x 4² / 2 x 6² / 2 x 10², Accessories supplied:, Drilling template, D6 wall + ceiling attachment set, 4 IP54 attachment bushes M25, seal range 9 - 18.5 mm, 1 IP54 sealing plug M25, seal range 9 - 18.5 mm

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE 5 - 24 x 6²
Cable junction box customizable
WKE 5 - 24 x 6²

171 x 256 x 106 mm
Article number: 86050524

Connection box 2 x 12-pole 0.5 - 6 mm², Number of conductors per pole:, 8 x 0.5² / 4 x 0.75² / 6 x 1² / 6 x 1.5² / 2 x 2.5² / 2 x 4² / 2 x 6², Accessories supplied:, 6 IP54 attachment bushes M20, seal range 8 - 13 mm, 2 IP54 attachment busches M40, seal range 17 - 30 mm, 2 IP54 double end connectors M40, seal range 17 - 30 mm, 1 IP54 sealing plug M20, seal range 8 - 13.5 mm, 1 IP54 sealing plug M40, seal range 17 - 30 mm, Drilling template, D6 wall + ceiling attachment set

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE 5 - 20 x 6²
Cable junction box customizable
WKE 5 - 20 x 6²

171 x 256 x 106 mm
Article number: 86050520

Connection box 2 x 10-pole 0.5 - 6 mm², Number of conductors per pole:, 8 x 0.5² / 4 x 0.75² / 6 x 1² / 6 x 1.5² / 2 x 2.5² / 2 x 4² / 2 x 6², Accessories supplied:, 6 IP54 attachment bushes M20, seal range 8 - 13 mm, 2 IP54 attachment bushes M40, seal range 17 - 30 mm, 2 IP54 double end connectors M40, seal range 17 - 30 mm, 1 IP54 sealing plug M20, seal range 8 - 13.5 mm, 1 IP54 sealing plug M40, seal range 17 - 30 mm, Drilling template, D6 wall + ceiling attachment set

Junction box with IP54 / IP65 certified as per EN 60670, with electrical functional integrity E30 – E90 acc. to DIN 4102-12, with insulation integrity FE180 acc. IEC 60331-11 as well as functional class F400 acc. EN 12101, halogen-free enclosure made from special duroplastic, terminals made from high temperature-proof special ceramics, rapid mounting thanks to external fixing brackets and wall + ceiling fastening parts kit D6

WKE AK 28
Small scale distributor customizable
WKE AK 28

400 x 690 x 230 mm
Article number: 86542801

stop left, 2 row, 28 distribution units, Ui=400V, 150 mm rail spacing, screwless PE/N terminal rails each with 3 screwable clamping points 1.5 - 4 mm², 21 / 2 x 14 screwless clamping points 1.5 mm² - 4 mm², elastic entries on top, with cable covering, masking and labelling strips, additional double-membrane seals and other accessories

Fire protection small-scale distributors, VDE certificated compliant with DIN EN 61 439-2, VDE tested and certified under specific operating conditions to be compliant with DIN EN 61 439-2, tested compliant with DIN 4102-2 by MPA Dresden, F90 for internal flame impingement according to DIN 4102 based on I90, F90 for external flame impingement according to DIN 4102 based on E90, can be individually equipped with type-tested operating materials

WKE AK 14
Small scale distributor customizable
WKE AK 14

400 x 540 x 230 mm
Article number: 86541401

stop left, 1-row, 14 distribution units, Ui=400V, screwless PE/N terminal rails each with 3 screwable clamping points, 2.5 - 16 mm², 14 screwless terminal points, 1.5 - 4 mm², elastic entries on top, with cable covering, masking and labelling strips, additional double-membrane seals and other accessories

Fire protection small-scale distributors, VDE certificated compliant with DIN EN 61 439-2, VDE tested and certified under specific operating conditions to be compliant with DIN EN 61 439-2, tested compliant with DIN 4102-2 by MPA Dresden, F90 for internal flame impingement according to DIN 4102 based on I90, F90 for external flame impingement according to DIN 4102 based on E90, can be individually equipped with type-tested operating materials

WKE AK 42
Small scale distributor customizable
WKE AK 42

400 x 840 x 230 mm
Article number: 86544201

stop left, 3 row, 42 distribution units, Ui=400V, 150 mm rail spacing, screwless PE/N terminal rails each with 6 screwable clamping points, 2.5 - 16 mm², 21 / 2 x 14 screwless clamping points 1.5 mm² - 4 mm², elastic entries on top, with cable covering, masking and labelling strips, additional double-membrane seals and other accessories

Fire protection small-scale distributors, VDE certificated compliant with DIN EN 61 439-2, VDE tested and certified under specific operating conditions to be compliant with DIN EN 61 439-2, tested compliant with DIN 4102-2 by MPA Dresden, F90 for internal flame impingement according to DIN 4102 based on I90, F90 for external flame impingement according to DIN 4102 based on E90, can be individually equipped with type-tested operating materials

WKE AK 70
Small scale distributor customizable
WKE AK 70

400 x 1140 x 230 mm
Article number: 86547001

stop left, 5 row, 70 distribution units, Ui=400V, 150 mm rail spacing, screwless PE/N terminal rails each with 6 screwable clamping points, 2.5 - 16 mm², 21 / 2 x 14 screwless clamping points 1.5 mm² - 4 mm², elastic entries on top, additional double-membrane seals and other accessories

Fire protection small-scale distributors, VDE certificated compliant with DIN EN 61 439-2, VDE tested and certified under specific operating conditions to be compliant with DIN EN 61 439-2, tested compliant with DIN 4102-2 by MPA Dresden, F90 for internal flame impingement according to DIN 4102 based on I90, F90 for external flame impingement according to DIN 4102 based on E90, can be individually equipped with type-tested operating materials

WKE AK 56
Small scale distributor customizable
WKE AK 56

400 x 990 x 230 mm
Article number: 86545601

stop left, 4 row, 56 distribution units, Ui=400V, 150 mm rail spacing, screwless PE/N terminal rails each with 6 screwable clamping points, 2.5 - 16 mm², 21 / 2 x 14 screwless clamping points 1.5 mm² - 4 mm², elastic entries on top, additional double-membrane seals and other accessories

Fire protection small-scale distributors, VDE certificated compliant with DIN EN 61 439-2, VDE tested and certified under specific operating conditions to be compliant with DIN EN 61 439-2, tested compliant with DIN 4102-2 by MPA Dresden, F90 for internal flame impingement according to DIN 4102 based on I90, F90 for external flame impingement according to DIN 4102 based on E90, can be individually equipped with type-tested operating materials

WKE AK 42 R
Small scale distributor customizable
WKE AK 42 R

400 x 840 x 230 mm
Article number: 86554201

Stop right, 3 row, 42 distribution units, Ui=400V, 150 mm rail spacing, screwless PE/N terminal rails each with 6 screwable clamping points, 2.5 - 16 mm², 21 / 2 x 14 screwless clamping points 1.5 mm² - 4 mm², elastic entries on top, with cable covering, masking and labelling strips, additional double-membrane seals and other accessories

Fire protection small-scale distributors, VDE certificated compliant with DIN EN 61 439-2, VDE tested and certified under specific operating conditions to be compliant with DIN EN 61 439-2, tested compliant with DIN 4102-2 by MPA Dresden, F90 for internal flame impingement according to DIN 4102 based on I90, F90 for external flame impingement according to DIN 4102 based on E90, can be individually equipped with type-tested operating materials

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