DKE German Commission for Electrical, Electronic & Information Technologies of DIN and VDE
DIN VDE 0100 Beiblatt 5
; VDE 0100 Beiblatt 5:2017-10
Low-voltage electrical installation - Supplement 5: Permissible lengths of cables and cords taking into consideration fault protection, protection against short circuit and voltage drop
Errichten von Niederspannungsanlagen - Beiblatt 5: Maximal zulässige Längen von Kabeln und Leitungen unter Berücksichtigung des Fehlerschutzes, des Schutzes bei Kurzschluss und des Spannungsfalls
Overview
This Supplement contains information for the planning and construction of low-voltage electrical installations; for example, the various calculation methods required for calculating the limit lengths of cables and lines and for selecting the protective devices, taking into account the various protection goals. The selection tables listed for the limit lengths of cables and lines and device parameters with specified boundary parameters support the electricians in setting up a safe low-voltage system. Compared to DIN VDE 0100 Supplement 5 (VDE 0100 Supplement 5):1995-11, the following significant changes have been made: a) the values for the limit lengths in the tables have been revised. b) the derivation of the network series impedance and the line impedances has been formulated to be generally valid, not only for outgoing and return conductors with the same cross-section, as was previously the case. c) the conductor temperature was derived at the end of the fault time. d) The impedance angles of multi-conductor cables have been adjusted. e) notes were added on: - flow chart for determining the equipment and the coordination of a circuit - important formulas for calculating short circuits in accordance with IEC 60909-0 - General equipment data - checking protection in the event of a short circuit - determining the conductor temperature at the end of the fault time - determining the limit lengths for the voltage drop - simplified approach to checking selectivity. The responsible committee is DKE/UK 221.2 "Schutz gegen thermische Auswirkungen/Sachschutz" ("Protection against thermal effects/property protection") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.
Document: references other documents
Document: referenced in other documents
Responsible national committee
DKE/K 221 - Elektrische Anlagen und Schutz gegen elektrischen Schlag
