Is it safe to use the same cable for both indoor and outdoor parts of an electrical installation?

No, cables are designed for specific environmental conditions and using an indoor-rated cable outdoors can lead to premature failure and safety hazards. Outdoor installations require cables with UV resistance, enhanced moisture protection and often a tougher overall sheath. For fixed outdoor wiring, types like NYY or heavy-duty armored cables are suitable; for flexible connections in damp areas, H07RN-F rubber cables offer high flexibility and water resistance. Selection must also follow the installation method requirements detailed in HD 60364-5-52 to guarantee long-term reliability without insulation degradation.