MT 3 - TC 2/MT 3

CORRECTED VERSION 2026-07
IEC 60034-8:2026 applies to AC and DC machines and specifies:
a) rules for the identification of winding connection points;
b) marking of winding terminals;
c) direction of rotation;
d) relationship between terminal markings and direction of rotation;
e) terminal marking of auxiliary devices;
f) connection diagrams of machines for common applications.
This fourth edition cancels and replaces the third edition published in 2007 and Amendment 1:2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) The inclusion of turbine-type synchronous machines in the scope.
The content of the corrigendum 1 (2026-07) has been included in this copy.

Applies to a.c. and d.c. machines and specifies rules for the identification of winding connection points; marking of winding terminals; direction of rotation; relationship between terminal markings and direction of rotation; terminal marking of auxiliary devices; connection diagrams of machines for common applications. The main change with respect to the previous edition consists of changed terminal markings for d.c. machines.

This International Standard is intended to be applied by users, and covers factors directly related to the inspection and maintenance of electrical installations within hazardous areas only. It does not include conventional requirements for electrical installations, nor the testing and certification of electrical apparatus. It does not cover Group I apparatus (applications for mines susceptible to firedamp). It does not cover the alternative of "Continuous supervision by skilled personnel".