| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to check the position of a wiring and piping box previously and form an opening accurately in position when the opening is drilled in a wall. SOLUTION: A part to be detected 3 in a wiring box 1 is magnetically detected from the front of a wall before an opening for an opened face of the wiring box 1 put inside the wall is drilled in a wall member 21. Then, a small hole is drilled at a detected position of the part 3 in the wall member 21. A metallic bar is passed in the small hole to detect whether magnetic attractive force is caused or not from the detective part, and thereby the position of the part 3 is checked. |
