Electricity: conductors and insulators – Overhead – Towers – poles or posts
Patent
1979-03-05
1981-03-31
Reynolds, B. A.
Electricity: conductors and insulators
Overhead
Towers, poles or posts
248 56, H02G 322
Patent
active
042595428
ABSTRACT:
A poke-through electrical fitting for protecting and supporting a wire or cable as it passes through a fire rated barrier and which will fit through a standard knock out of an electrical fitting box which is one and three-eighths inches in diameter and which, in the trade, is called a one inch knock out. The fitting does not require an electrical fitting box on both sides of the barrier. The device comprises an elastomeric grommet having an appropriately sized transverse hole and a slit from the outer periphery to the hole for permitting opening of the grommet and laying in of the wire or cable. An upper and lower compression plate is provided on each end of the grommet and coupling screws are provided for compressing the grommet between the compression plates to cause the elastomeric grommet to grasp the wire and close the passageway through the barrier. The lower compression plate has a clamp for clamping and supporting any cable of the size range which may be accommodated by the device. The device provides through ground continuity, and prevents the passage of liquids, fire, smoke and related products of combustion, and provides support for the electrical fitting box.
REFERENCES:
patent: 1850792 (1932-03-01), Frederickson
patent: 1851940 (1932-03-01), Williams
patent: 2276818 (1942-03-01), Bellows
patent: 3779585 (1973-12-01), Handzlik
patent: 3803341 (1974-04-01), Klinkman et al.
patent: 3995102 (1976-11-01), Kohaut
patent: 4021604 (1977-05-01), Dola et al.
patent: 4061344 (1977-12-01), Bradley et al.
Bradley Robert L.
Tehan James F.
General Signal Corporation
Killian George W.
Kleinman Milton E.
Reynolds B. A.
Tone D. A.
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