Outer conductor - Außenleiter
Preferred color coding of external conductors for three-phase alternating current in the CENELEC area : |
brown, black, gray
An outer conductor (colloquially phase ) is a conductor, which in the normal operating under tension is, and can contribute to the transmission or distribution of electric power, but no neutral conductor (center conductor) is.  In single-phase connections with a nominal voltage of 230 V , it only occurs once and is designated with L (from English line conductor ); In the case of three-phase connections, there are three outer conductors, which are designated L1, L2 and L3 (previously R, S, T). 
In the low-voltage network, the rms value of the voltage of the outer conductors is usually
In Switzerland, the name Polleiter was specified according to the standard until 2010 , it was adapted to external conductors .
- DIN 40108: 2003-06 Electrical power engineering , power systems - terms, sizes, symbols.
- International Electrotechnical Dictionary IEC 60050-826: 2004-08 (DIN VDE 0100-200: 2006-06), No. 826-14-09.