This document applies to: - functional and electrical safety aspects of carrier cycles covered in all parts of EN 17860; - electrical aspects of electrically power assisted cycle trailers (EPACT) covered in prEN 17860-7; - electrical aspects of batteries used for carrier cycles; - electrical aspects of chargers used for carrier cycles. This document does not apply to charging stations. This document specifies requirements and test methods for motor power management systems, electrical circuits including the charger for the assessment of the design and assembly of carrier cycles and subassemblies for systems having a Safety Extra Low Voltage (SELV) maximum working voltage ≤ 60 V d.c. disregarding transients.