If you are searching for you are likely an electrical engineer, installer, or project planner working on low-voltage electrical installations in Germany or other DACH countries. This standard is the German implementation of the international IEC 60364 series (Low-voltage electrical installations).
A massive series of sub-sections covering everything from switchgear (Part 530) to wiring systems (Part 520). The is invaluable here because it clarifies the unique German requirements for "concealed cables" (installation behind walls) and derating factors specific to German climate conditions.
Let's address the elephant in the room. If you search for a free PDF of DIN VDE 0100 in English, you will find many websites offering downloads.
