| 摘要 |
PURPOSE:To identify a cause of stopping combustion with a hardening of a non-burned ceramic layer by a method wherein an electrical wiring having the non-burned ceramic layer is applied as an electrical wiring to be connected to a temperature fuse and the like. CONSTITUTION:Electrical wirings 11 and 12 are constructed such that an electrical conductor 20 is covered by a non-burned ceramic layer 21 and its outer surface is covered by a protective layer 22. The non-burned ceramic layer is soft and if it shows a high temperature, its burned formation is promoted with heat and hardened. The protective layer 22 is formed by resin such as urethane and polyester and the like. In case a combustion device 3 continues to burn under an erroneous operation of a temperature control circuit and in case a temperature fuse 10 is broken with an over-heated state of a heat exchanger 6 and the combustion device 3 stops, the non- burned ceramic layer 21 of the electrical wirings 11 and 12 is hardened due to an increased temperature. In case the temperature fuse 10 is mechanically damaged and in case the combustion device 3 stops under an erroneous operation of the temperature control device, the non-burned ceramic layer 21 does not show any hardening at all, so that an examination if the electrical wirings 11 and 12 are hardened or not enables the cause of stopping of the combustion device 3 to be easily identified.
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