A METHOD OF DETERMINING THE TYPE AND THE POSITION OF A CLOSED ELECTRICAL CONDUCTOR, A MEASURING SET-UP FOR DETERMINING THE TYPE AND THE POSITION OF A CLOSED ELECTRICAL CONDUCTOR, AND USE OF THE MEASURING SET-UP

摘要

For determining the type and the position of a closed electrical conductor (4, 10), such as a ring (4) of electrically conductive material arranged in an electrical wiring box (1) which is concealed behind a wall/ceiling panel or below a floor, a method and a measuring set-up are disclosed wherein a current is induced in the ring (4, 10) from at least one movable magnetic field generating device, which thereby generates a magnetic field which is detected by one or more magnetic field detectors (A, B, C, D) which are fixed with respect to the magnetic field generating device (20). When the position of the magnetic field generating device provides a measuring signal with a given shape or value predetermined from the magnetic field detectors, the exact position of the closed electrical conductor (4, 10) may be determined. The measuring set-up for performing the invention consists of at least 3 coils, preferably 5 coils, where 1 coil serves as a transmitter coil (20), while 4 coils (A, B, C, D) in pairs serve as receiver coils for determining the co-ordinates (0, 0) of a system of co-ordinates in which a wiring box has its centre.