| 摘要 |
Power cable includes, along with standard conductor wires encased in insulation, a heat responsive cable alongside the conductor wires. The heat responsive cable includes helically wound wires each coated with heat sensitive dielectric, The two wound wires at one end are oppositely connected to an alarm and to a main power switch, forming a normally open safety circuit. The dielectric on the heat responsive cable is subject to vaporization in response to a fault in the power cable, whereby the wound wires make electrical contact to close the safety circuit, activate the alarm, and open the main power switch.
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