Electricity: conductors and insulators – Overhead – Towers – poles or posts
Patent
1981-07-31
1983-12-06
Grimley, A. T.
Electricity: conductors and insulators
Overhead
Towers, poles or posts
52232, 169 48, H02G 322
Patent
active
044195354
ABSTRACT:
A multi-cable conduit has a housing which is opened at opposite ends, and a plurality of partitions dividing the interior of the housing into a plurality of compartments extending between the open ends. Each of the compartments is sized to receive a multiplicity of cables extending through the compartment and the open ends of the housing, and the compartments are elongated in a direction transverse to the axes of the cables. The partitions are slidably supported within the housing so that each partition can be separately inserted into, and removed from, the housing. A lining of intumescent material is provided on the walls of each compartment for expanding into and sealing each of the compartments in response to a fire. Compartments or portions of compartments which are not filled with cables are filled with a nonflammable insert. At least one end of each compartment is also sealed to limit the transmission of smoke through the compartments prior to expansion of the intumescent material. Directing means are also provided at the open ends of the compartments for focusing the expansion of the intumescent material into the compartments.
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Building Materials Directory, Underwriters Laboratories Inc., Jan. 1981, pp. 507-523.
Grimley A. T.
Tone D. A.
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