US 2015/0271874 A9 · HEATING CABLE

Abstract

A heating cable includes a bus wire structure that includes a plurality of bus wires. An insulation layer is provided to insulate the plurality of bus wires. A plurality of node areas exposes portions of the bus wires from the insulation. A heating element is wrapped around the bus wire structure in a helical manner. The heating element includes an insulating core and one or more resistance wires wrapped around the core in a helical manner. The heating element is electrically coupled to the nodes of the bus wire structure at the plurality of node areas. The insulating core may be made of a folded-over tape made of a cloth material, such as glass cloth. Pluralities of redundant paths in between two nodes are provided to allow for current to flow in a zone if one of the redundant paths is broken.

Claims21

Dependent claims

A heating cable comprising:

a bus wire structure comprising:
a plurality of bus wires;
and
an insulation layer for the plurality of bus wires, the insulation layer including a plurality of node areas, the node areas exposing portions of the bus wires from the insulation;
a heating element wrapped around the bus wire structure in a helical manner, the heating element comprising:
an insulating core;
and
one or more resistance wires wrapped around the core in a helical manner,
wherein the heating element is electrically coupled to the nodes of the bus wire structure by coupling the one or more resistance wires to the bus wires at the plurality of node areas to create a plurality of resistance zones, wherein a plurality of redundant paths in between two nodes are provided to allow for current to flow in a zone if one of the redundant paths are broken.

6 more elements

Dependencies are inferred from the claim text.

Heating cable

Life of this patent

Heating cable

Life of this patent

Abstract

Claims21