| 摘要 |
PURPOSE:To easily, efficiently and economically provide illumination from a power cable in a site of no power supply like in a manhole or the like by annularly connecting the half-split lighting tubes, mounting each filament stored in the inside, made mountable with the single-core power cable serving as the center. CONSTITUTION:In the inside of half-divided lighting tubes 1, 2 formed of half ring-shaped glass tube, incandescent lamp use filaments 1a, 2a are respectively stored to be mounted, to provide protruded/recessed type terminals 1b, 1c and 2b, 2c in each end. By inserting these terminals 1b and 2c, 1c and 2b to each other, the lighting tubes 1, 2 are connected in an annular shape with a single- core power cable 3 serving as the center, to constitute a lighting equipment. Here is interposed a spacer 4 formed of non-magnetic material between the cable 3 and the lighting equipment so that the lighting tubes 1, 2 are formed in a concentrical circle relating to the cable 3. Thus in a site of no power supply like in a manhole or the like, illumination is easily, efficiently and economically obtained from the cable 3. |
