Electrical heating cable with temperature self-limiting heating

Electric heating – Heating devices – With heater-unit housing – casing – or support means

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Details

174 52PE, 219505, 219535, 219541, 219544, 219549, 338 22R, 338214, H05B 356

Patent

active

040728480

ABSTRACT:
An electrical heating cable which limits power output once an established temperature limit is reached. The cable includes heating elements in the form of temperature-sensitive variable resistance elements electrically connected in parallel between two supply bases at spaced positions along the length of the buses. The heating elements not only serve to generate heat for heating but also undergo a substantial positive increase in resistivity when the temperature of the cable nears the established temperature limit. The increase in resistivity substantially reduces the heat-generating current in the cable to limit the power output to within established heat limits.

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patent: 3748439 (1973-07-01), Ting et al.
patent: 3757086 (1973-09-01), Indoe
patent: 3824328 (1974-07-01), Ting et al.
patent: 3959622 (1976-05-01), Bohdonow
patent: 3976854 (1976-08-01), Ishikawa et al.
patent: 3995141 (1976-11-01), Vieau et al.

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