Systems for the maintenance of electrical function – standard support structures and routing systems

The maintaining of the electrical function of safety-relevant systems is one of the main protection aims in case of fire. Technical equipment, such as emergency lighting, fire alarm systems and smoke extraction systems, must continue to operate. To ensure this, OBO offers numerous systems approved as standard support structures in accordance with DIN 4102 Part 12.

These include not only cable trays, cable ladders and mounting systems, but also strain relief TSE90, which is used for the vertical routing of cables for the maintenance of electrical function. A direct fire load in the area of the clips can mean that the cables are no longer clamped properly and can tear due to their dead weight. This would result in an interruption to the power supply. But the strain relief can prevent this happening and maintain secure functioning of the electrical supply. The housing, made of non-combustible material with integrated insulation, is mounted directly over a series of clips. This means that even at a storey height of more than 3.5 m elaborate loops can be prevented. The operating principle is similar to that of the cable insulation in the storey ceiling: If there is a fire, the series of clips in the housing remains relatively cold and the cables remain clamped, effectively preventing breakage. With this recognised fire protection solution, DIN-conformant and effective support of the vertically installed cables that maintain the electrical supply can be achieved in a way that is extremely economic and space-saving.