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RGSFB Ex is for bolting. The bolted transits can be used in areas where welding is prohibited, or when the stress level induced by welding is unacceptable.
For installations where cables are already in place, specify RGSFBO Ex which has a removable end.

The system consists of a frame, rubber blocks and a compression unit.
The frame is or bolted to a marine structure and packed with rubber blocks suited for each cable and pipe dimension. The compression unit is inserted to compress the rubber blocks against cables and pipes to establish a tight seal. 


6 Bar
6 Bar
RGSFB Ex multi cable transit

Benefits of MCT Brattberg Ex systems

  • Ex rated transit for hazardous environments
  • Assists cable management
  • Seals the penetration against the passage of fire, water, gas, sound and environmental hazards
  • Can be combined with special EMC modules and for Grounding and Bounding
  • Cable dimension marked on block
  • Unlike other brands our system can be dismantled and re-used
  • No adaptation of standard blocks needed


The marking of the equipment and protective system

Group II Category 2GD Ex eb IIC Gb Ex tb IIIC Db Tamb (-60°C to+70°C)





Technical Specifications

RGSFB Ex is a standard transit with a flange and Ex gasket that allows the frame to be bolted where welding is not possible.

Standard frames come in eight sizes: 1, 2, 3, 4, 5, 6, 7, and 8. 
The internal width can be 60.5 ± 1 (Size 1,3,5,7) or 120.5 ± 1 (2,4,6,8).

Note that there can be limitations in type-approvals & certificates, making certain sizes inapplicable.

RGSFB Ex can also be installed in multiple frames.

RGSFB Ex transits are supplied in kits, complete with drilled holes, bolts, nuts, washers and a gasket or sealing compound. The flange is 60x10mm. (2.36”x0.39”).

Standard frames come in four sizes: 2, 4, 6 and 8. They are all the same width. Height differences are shown below. The material is 10 mm thick.

RGSFB Ex Sizes

For further technical information see tables in our Online Catalogue:


Maritime resistance to fire: 
Class A0, A60, H0, H60, H120 - IMO FTP Code 2010
(For more info see Certificates)

6 Bar water pressure load for 60 minutes - DNVGL-CP-0165 

4 Bar air pressure load for 30 minutes - DNVGL-CP-0165  

Enclosure degree of protection Nema 250:
3R; 4X; 12 - Nema 250-1st

Enclosure degree of protection IP: 
IP65; IP66; IP67; IP68 2 meters 60 min - IEC 60529

Resistance to jet fire:
RGSbtb- J120 & JF 
RGS - J60 & JF 
(Contact MCT Brattberg for application details)



Trade name: 
MCT Brattberg RGSFB Ex multi cable/pipe transit system


Working temperature:
 -60 to +70 degrees C

Lycron data

Read Lycron data sheet:
Data sheet Lycron

Lycron is halogen free and flame retardant.


For all approvals, please also see Certificates 


  • Available only as equipment.
  • Ex gasket is supplied with the transit and is a mandatory component. 

Component is not intended to be used alone and requires additional consideration when incorporated into other equipment or systems for use in explosive atmospheres (refer to IEC 60079-0)

  • Ex system combined with EMC has yellow marking on the front face (see EMC instructions)


  • The Stainless steel bolts A4 M12 recommended torque value is 75 Nm.

Correct and safe installations

To achieve the highest standard of safety, a cable or pipe transit must be installed correctly. As there are many different types of frame – which may be either welded, bolted or glued into position – and insert block, it is essential that installers known when to use the most appropriate installation method.

For more information, please view following instructions, videos or download manuals as PDFs.

RGSFB bolting instruction
RGS frame, horizontal installation
RGS frame, vertical installation

Download pdf instructions 

For more information visit Documents & instructions

Multiple frames


Horizontal multiple frames are described by listing the frame type and size x the desired number of horizontal openings.
Designation (starting at bottom):
Frame type 6x4


Vertical multiple frames are described by listing the bottom frame type and size + the next frame type and size.
Designation (starting at bottom):
(frame type) 6+6+4 and (frame type) 6+4+2


List the entire vertical frames x the desired number of horizontal repetitions.
Designation (starting at bottom):
(frame type) 6+4+2x4

NOTE: All multiple frame designations must be preceded by the frame type.

NOTE: All multiple frame designations must be preceded by the frame type.

Components Ex

Ex and ATEX requirements are very strict, some Ex Insert blocks may not be approved with certain systems.



  • Insert Blocks combined with EMC has yellow marking on the front face (see EMC instructions)

Ex Insert Blocks (IECEx/ATEX)


Standard Block

Standard Block for a fast and safe installation.

Read more


Eleven blocks and 66 dimensions.

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The U-Block is used to convert the external dimensions of Insert Blocks, AddBlocks and Spare Blocks to the next modular size.

Read more
Spare Block


The unused space in the frame is filled with solid spare blocks. Using the spare blocks allows the option of fitting new cable in the future.

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MCT Brattberg Lubricant for easier and safer installation.

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PTG Presswedge

The Presswedge compresses the system and completing the seal.

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E-PTG Presswedge

The Presswedge with EMC and G&B capabilites compresses the system and completing the seal.

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