Variable power limiting heat tracing cable

(19)

(11)

EP 0 802 701 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	19.11.1997 Bulletin 1997/47

(43)	Date of publication A2:
	22.10.1997 Bulletin 1997/43

(21)	Application number: 96303335.2

(22)	Date of filing: 13.05.1996

(51)	International Patent Classification (IPC)⁶: H05B 3/56

(84)	Designated Contracting States:
	DE FR GB IT NL

(30)

Priority:

19.04.1996 CA 2174615

(71)	Applicant: Heizer, Glenwood Franklin
	London, Ontario, N6K 1B1 (CA)

(72)	Inventor:
	Heizer, Glenwood Franklin London, Ontario, N6K 1B1 (CA)

(74)	Representative: Bailey, David Martin
	Brookes & Martin High Holborn House 52-54 High Holborn London WC1V 6SE London WC1V 6SE (GB)

(54)	Variable power limiting heat tracing cable

(57) A heating cable includes a pair of elongated electrode wires, each of which is coated with a first layer of insulating material. The first layer of insulating material is at least partially stripped off selected ones of the wires at spaced, alternating locations. A resistive heater wire, together with a yarn of fibrous insulating material, is spirally wound around the electrode wires whereby the heater wire is brought into electrical contact with selected ones of the electrode wires at the alternating locations, to electrically connect the alternating locations with the resistive heater wire. A second layer of an insulating material is provided over the resistive heater wire and insulating material, forming an outer surface for the cable.

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