Flat Cable Deflection Device Fire Resistance
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Solution Overview
Problem
Conventional electrical cables and installation systems fail to maintain functional integrity during fires due to insulation melting and short circuits, posing risks to evacuation systems in large buildings and structures.
Innovation Solution
A flat cable deflection device and installation set utilizing a cylindrical cable deflection body made of fire-resistant insulating material, combined with a holder and fire-resistant insulating material between high-voltage wires, prevents mechanical stress and short circuits by allowing the flat cable to wrap around the deflection body without touching it, ensuring continued functionality during fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cables are used in electrical installations, then the installation can be simply constructed, but the cable insulation melts or burns off under fire conditions causing short circuits and loss of functional integrity
Solution Approach 1:
A fire-resistant insulating material is introduced as an intermediary between the cable cores and the cable jacket. This intermediate layer prevents direct contact between cores when the outer insulation fails during fire, maintaining electrical isolation without requiring complete redesign of the cable structure.
Solution Approach 2:
The cable insulation system is segmented into multiple functional layers: the outer cable jacket, the fire-resistant insulating material layer, and the core conductors. This segmentation allows each layer to perform its specific function independently, with the fire-resistant layer acting as a backup isolation barrier.
2Reliability
If special fire-resistant equipment and core insulation are used to avoid short circuits during fire, then functional integrity is improved, but the technical demand and complexity increase significantly
Solution Approach 1:
The fire-resistant insulating material is applied uniformly between all cable cores in a consistent manner. This homogeneous application simplifies the manufacturing process by providing a standardized procedure that can be implemented across different cable types and configurations.
Solution Approach 2:
The cable construction uses composite material structure combining different insulating materials with complementary properties. The fire-resistant insulating material is selected and applied in a way that leverages its specific fire resistance characteristics while working together with the existing cable structure.
3Reliability
If standard cable attachments and hangers are used, then the installation system is simple, but they do not meet the high requirements for load-bearing elements and connecting elements under fire conditions
Solution Approach 1:
The cable deflection device changes the spatial parameters of cable routing by directing cables away from vertical surfaces and high-risk areas. This parameter change in cable position and orientation reduces exposure to fire hazards without requiring fundamental changes to the support system.
Solution Approach 2:
The cable deflection device acts as an intermediary element between the cable and the fire environment. It provides a mechanical solution that mediates the interaction between the cable installation and fire hazards, protecting the cable without requiring the cable material itself to have enhanced fire resistance.
Data Source
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AI summary
A flat cable deflection device (38) with fire resistance comprises a cylindrical cable deflection body (39) made of fire-resistant insulating material and a holder (41) for the cylindrical cable deflection body (39), also made of fire-resistant material. The holder is spaced from the cylindrical cable deflection body (39) such that it allows the flat cable (1) to wrap around it without touching it. An electrical installation (53) consists of at least one such deflection device (38) and a flat cable (1) that runs over the deflection device (38) and changes direction at it, wherein the cable's transverse direction (Q) is horizontal before and after the deflection device (38), and wherein the flat cable (1) at least partially wraps around the cylindrical cable deflection body (39).