EN IEC 61116:2025

Electromechanical equipment guidance for small hydroelectric installations EN IEC 61116:2025

Publication date:   Jan 15, 2026

Scope

IEC 61116:2025 used as a guidance that applies to hydroelectric installations containing impulse or reaction turbines with unit power up to about 15 MW and reference diameter of about 3 m. These figures do not represent absolute limits.

This document deals only with the direct relations between the purchaser or the consulting engineer and the supplier. It does not deal with civil works, administrative conditions or commercial conditions. This document is intended to be used by all concerned in the installation of electromechanical equipment for small hydroelectric plants.

This document, based essentially on practical information, aims specifically at supplying the purchaser of the equipment with information which will assist him with the following:

preparation of the call for tenders;

- evaluation of the tenders;

- contact with the supplier during the design and manufacture of the equipment;

- quality control during the manufacture and shop-testing;

- follow-up of site erection;

- commissioning;

- acceptance tests;

- operation and maintenance.

The document comprises the following:

a) general requirements for the electromechanical equipment of small hydroelectric installations;

b) technical specifications for the electromechanical equipment, excluding its dimensioning and standardization;

c) requirements for acceptance, operation and maintenance

This second edition cancels and replaces the first edition published in 1992. This edition includes the following significant technical changes with respect to the previous edition:

a) harmonization of scope with IEC 62006;

b) introduction of new technical aspects;

c) overall editorial revision.