Outer conductor
Preferred color coding of external conductors for three-phase alternating current in the CENELEC area : brown, black, gray |
L1 |
L2 |
L3 |
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 denoted by L (from English line conductor ); with three-phase connections there are three outer conductors, which are designated L1, L2 and L3 (previously R, S, T).
With three-phase alternating current ("three-phase current"), the alternating currents in the three outer conductors reach their amplitudes (in time) at different phase angles .
In the low-voltage network, the rms value of the voltage of the outer conductors is usually
- 230 V against the neutral conductor and the protective conductor and
- 400 V between two outer conductors.
In Switzerland, the designation Polleiter was specified according to the standard until 2010 , it was adapted to external conductors .
See also
Individual evidence
- ↑ 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.