Three-phase line

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Cross-section of a three-phase cable for low voltage

A three-phase line is an electrical line for three-phase alternating current . In addition to the three outer conductors , it usually has a PEN conductor or a protective conductor and a neutral conductor . Common types of construction are overhead lines (without protective conductors), high-voltage cables in which the individual conductors are designed in a coaxial design, and multi-core cables for low voltage .

Marking in the low-voltage network

The conductor colors and markings for connection terminals permitted for three-phase cables in low-voltage networks are specified in several standards. In DIN EN 60445; VDE 0197: 2011-10 defines general rules for the use of certain colors or alphanumeric characters for the identification of electrical conductors. The intention is to avoid ambiguity and to ensure safe operation. These colors or alphanumeric characters for conductors are intended for use in cables and wires or wires, busbars, devices and installations.

From DIN VDE 0100-510: 2011-03 is under section 514.3. the binding identification of the protective conductor (PE) with the two-color combination “green-yellow” and the neutral conductor (or center conductor) with the color “blue”. For both conductors, color coding is required over the entire length. In the case of the protective conductor, the color combination “green-yellow” must not be used for any other purpose. Outer conductors must be marked with the colors "brown" or "black" or "gray" over their entire length. The use of only one of these colors for all external conductors of a circuit is permitted. The individual colors "green" and "yellow" may not be used in three-phase lines.

The labeling of insulated conductors in rigid and flexible cables and lines with two to five cores must comply with DIN VDE 0298-300: 2009-09. This does not apply to supply cables from network operators to the transfer point to the customer.

literature

  • Günter Springer: Expertise in electrical engineering . 18th edition. Europa - Lehrmittel, Wuppertal 1989, ISBN 3-8085-3018-9 .
  • Herbert Schmolke: Selection and dimensioning of cables and lines . 4th edition. Hüthig & Pflaum Verlag, Munich and Heidelberg 2010, ISBN 978-3-8101-0299-7 .

Norms

  • DIN EN 60445 VDE 0197: 2011-10 - Basic and safety rules for the human-machine interface - Marking of connections of electrical equipment, connected conductor ends and conductors (IEC 60445: 2010); German version EN 60445: 2010
  • DIN VDE 0100-510: 2011-03 - Installation of low-voltage systems Part 5-51: Selection and installation of electrical equipment - General provisions (IEC 60364-5-51: 2005, modified); German adoption HD 60364-5-51: 2009
  • DIN VDE 0298-308: 2009-09 - Guidelines for the use of harmonized low-voltage power lines; German version HD 516 S2: 1997 + A1: 2003 + A2: 2008

Individual evidence

  1. ↑ Copper in electrical engineering - cables and wires. (PDF; 650 kB) Deutsches Kupfer-Institut eV, accessed on February 20, 2019 .