| 摘要 |
PROBLEM TO BE SOLVED: To provide a conduit tube having superior insulating property and not interfering a wire sensing function such as the detection of a starting end of a welding robot used simultaneously with the conduit tube. SOLUTION: In this conduit tube 1, a tube body 2 is composed of a long coil spring 6 and an insulating tube 4 covering the outside of the spring 6, and the insulating tube 4 has a radial thickness of 5 mm, and a resistance value of 50 MΩor more when the impressed voltage is 250 V.
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