MCT Brattberg - Fire Resistance Class A60 & H120 Cable & Pipe Seal Penetrations

MCT Brattberg Cable Transits 

Fire Resistance Class A60 & H120 Cable & Pipe Seal Penetrations

MCT Brattberg cable transits are tested against fire resistance to both A and H classification.

Cable Transit Fire Test Procedure
The temperature regime in the furnace during an A-class fire is similar to that of a cellulose fire and during an H-class fire similar to that of an oil fire. In a H-class fire the increase in temperature is much faster than that of an A-class fire. The cable penetration must be tested both vertically and horizontally in order to be approved for general usage by the leading certifying authorities.

Location of Thermocouples
The temperature is constantly measured at different points on the cables and on the face of the cable or pipe penetration during the fire test. The quantity of thermocouples, type and position on the test specimen is regulated by the standards.

Cable Transit Integrity
The integrity of the cable penetration must be maintained throughout the test period (A-class 60 minutes, H-class 120 minutes). The occurrence of flaming on the unexposed face or ignition of a cotton wool pad applied to any gap that appears in the test specimen constitutes a loss of cable transit integrity.

Cable Transit Insulation
The limit of temperature increase on the non fire side of the penetration is stipulated in EN1366-3 or IMO A754 (18). The maximum acceptable temperature increase at any point on the cable or pipe penetration during the test is 180 degrees celsius. An approved fire test gives the cable or pipe penetration a classification where the fire is specified (a-H-class fire) and the time for which the penetration was able to resist the fire in respect of the maximum allowed temperature increase on the non fire side of the penetration (180 degrees celsius). For example, a cable or pipe penetration that withstands an H-class fire for 120 minutes is classed as H120 and a penetration that withstands an A-class fire for 60 minutes is classed A60.
 

Marine "A" Class Definitions

“A” class divisions are those marine divisions formed by bulkheads and decks which comply with the following :

1 they shall be constructed of steel or other equivalent material;

2 they shall be suitably stiffened;

3 they shall be constructed as to be capable of preventing the passage of smoke and flame to the end of the one-hour standard fire test;

4 they shall be insulated with the approved non-combustible materials such that the average temperature of the unexposed side will not rise more than 140oC above the original temperature, nor will the temperature, at any one point, including any joint, rise more than 180oC above the original temperature, within the time listed below:

Class “A-60” 60 min

Class “A-30” 30 min

Clss “A-15” 15 min

Class “A-0” 0 min

MCT Brattberg - Fire Resistance Class A60 & H120 Cable & Pipe Seal Penetrations