NBN EN 50123-4 Ed. 1 (1999)被替代

Defines requirements for outdoor d.c. switch-disconnectors, disconnectors and earthing switches for use in outdoor fixed installations of traction systems.

NBN EN 50123-4:2003

NEN EN 50123-4:2003 - Identical

SS EN 50123-4 Ed. 2 (2003) - Identical

UNE EN 50123-4:2004 - Identical

I.S. EN 50123-4:2003 - Identical

NF EN 50123-4:2004 - Identical

DIN EN 50123-4 (2003-09) - Identical

BS EN 50123-4:2003 - Identical

SN EN 50123-4:2003 - Identical