Title: Method of making heating cables

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Abstract: A mineral insulated heating cable and a method of making same wherein the cable has the characteristic that for a given supply voltage the heat generated per unit length of the cable is substantially unaffected by the total length of the cable. The mineral insulated heating cable comprises at least two metallic conductors, a metallic protective sheath, a body of compacted mineral insulating material filling the sheath and spacing the conductors from one another and embedded in the compacted mineral insulating material and contacting each of the two said conductors throughout their lengths, at least one resistance element in the form of a thin layer consisting predominantly of resistive material. The method of making the mineral insulated electrical heating cable comprises the steps of forming an assembly consisting of two or more ductile metallic conductors, namely a surrounding sheath and at least one other conductor within it, and a multiplicity of preformed blocks of mineral insulating material, at least some of which carry coatings of resistive material, filling the remaining spaces within the sheath with the coatings individually or collectively contacting at least two of the conductors throughout the length thereof, and reducing the cross-section of the assembly to form the mineral insulating material into a homogeneous body of compacted insulating powder whilst maintaining at least one layer of resistive material individually or collectively contacting at least two of the conductors throughout the length thereof.


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