Fire and oil resistant cable
AssigneeInternational Standard Electric Corporation
InventorsJack R. Pedersen, Hans R. Thomassen, Svein Henriksen
Life of this patent
Estimating the term…
Abstract
A cable is described which has improved flame/fire and oil/abrasion resistant properties. The cable is halogen free since the conductor insulation and all sheaths are of the self-extinguishing type. A metal screen braided at an angle between 35.degree. and 45.degree. formed between the individual wires and a plane at right angles to the cable axis over a vulcanized filler sheath provides protection of the cable conductors during fires. Outermost there is placed a thin oil and abrasion resistant extruded layer of nylon.
Claims12
A fire-resistant communication cable comprising:
- a conductor;
- a cover of an insulating material disposed on the outer surface of said conductor;
- a layer of a self-extinguishing material disposed on the outer surface of said cover of insulating material;
- a sheath of a material which is capable of releasing water of crystallization when subjected to at least a predetermined temperature and which is positioned on the outer surface of said layer of self-extinguishing material;
- a metallic screen positioned on the outer surface of said sheath and including wires braided with respect to a plane perpendicular to the cable axis at an angle in the range between but excluding 35.degree.-45.degree. to reduce longitudial shrinkage of the screen upon an increase in cable diameter and to maintain integrity of said conductor;
- and
- two outer protective covers located directly on the outer surface of said screen, said covers including a sheath of a self-extinguishing material.
Dependencies are inferred from the claim text.