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DIN 18381 [Withdrawn] references following documents:

Document number Edition Title
DIN VDE 0100-450 ; VDE 0100-450:1990-03 1990-03 Erection of power installation with nominal voltages up to 1000 V; protective measure for safety; protection against undervoltage More 
IEC 60529 1989-11 Degrees of protection provided by enclosures (IP code) More