DIN 44030-1:1992 Control technology; light barriers and light scanners; definitions
DIN EN 50047:1983 Low voltage switchgear and controlgear for industrial use; control switches; position switches 30 × 55; dimensions and characteristics
DIN EN 50178:1998 Electronic equipment for use in power installations; German version EN 50178:1997
VDI 2388-1995 Krane in Gebaeuden - Planungsgrundlagen
VDI 3575-2000 Path limiters for cranes - Mechanical and electromechanical components