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This specification defines basic technical requirements for emergency call systems for forestry use. It gives guidance on minimum requirements for the construction and equipment of radio emergency call systems. The following requirements are defined: - design principles; - environmental requirements; - labelling; - user information; - testing. This specification does not address the application-specific safety rules for handling emergency call equipment. This is part of the rules and regulations of the accident insurance institutions. This Technical Specification (DIN SPEC) has been prepared by DIN Standards Committee Municipal Services (NKT), Working Committee NA 051-03-05 AA "Forestry machinery" following preparatory work in Working Group NA 051-03-05-01 AK "Fernsteuerungen" ("Remote controls").