| 摘要 |
PROBLEM TO BE SOLVED: To facilitate detection of buried sections, by installing, in a cable distribution box, a resonance circuit constituted of an annular conductor inserted and fixed in an annular resonance circuit fixation groove formed in an upper end of the main body of the box and a capacitor inserted in the annular conductor. SOLUTION: In an upper edge of the main body 1 of a box, a resonance circuit fixation groove 21 is formed. The resonance circuit fixation groove 21 is constituted of a conductor insertion groove 22 which has groove sections 22a of a larger width at the corners and is different in width at specified intervals, and a capacitor insertion groove 23. In such a resonance circuit fixation groove 21, a resonance circuit 24 is inserted and fixed. The resonance circuit 24 is constituted of an annular conductor 25 whose diameter is smaller than large width sections 22c of the conductor insertion groove 22 and a capacitor 26 which is inserted in the annular conductor 25 and is inserted and fixed in the capacitor insertion groove 23. |
