Screw fixing method for electrical switch apparatus

摘要

The screw fixing method involves using switch apparatus (1) provided with a number of fixing bores (2) pressed against the surface of a mounting plate, after fitting a ring (4) provided with a surface ink around the outside of each fixing bore, so that an imprint of the position of the fixing bores is transferred to the mounting plate, for marking the position of the drill holes for the fixing screws. An Independent claim is included for an electrical apparatus with four fastening holes.