| 摘要 |
Cable trunking (10) lined with fire resistant thermal insulating material (13, 14). The trunking (10) has a panel (12) which is removable to provide access to the interior. The panel (12) has a channel section, the flanges (12A) of which form a gas-tight seal with the rest (11) of the casing. A normally-open vent arrangement (24-26) allows heat generated by the cables (16-18, 21-22) during normal operation to be dissipated. Each vent (26) is formed in a strip (24) of highly intumescent material which fills the interior of a top-hat section housing (25). In the event of a fire outside the trunking (10), the intumescent material within the housing (25) expands to form a rigid carbon plug which closes the respective vent (26). |
