Railway applications. Fixed installations. Particular requirements for alternating current switchgear - Circuit-breakers with nominal voltage above 1 kV1 Scope This EN 501521 is applicable to single pole and two pole alternating current (a. c.) circuit breakers which are: for indoor or outdoor fixed installations in tractions systems, and operated with an a. c. line voltage and frequency as specified in EN 50163. NOTE 1 EN 50163 specifies the a. c. traction systems 15 kV 16,7 Hz and 25 kV 50 Hz. NOTE 2 As rails of a. c. traction systems are connected to earth and included in the return current path

5 mm to 6 mm at room temperature and a relative humidity of max

This document is not relevant to temperature conversion integrated into gas meters which only indicate the converted volume

Annex A of this International Standard applies to high speed craft

— only in one position per coordinate plane of the machine

and complete filter units for electromagnetic interference suppression

This Part of BS 585 specifies materials and construction requirements for stairs constructed of timber

It is recognized that each of these tasks can at times be performed by the same persons

Flight passengers in commercial aviation spend the most part of their journey on their seats

These rivets are made of corrosion-resistant steel which implies that it has durable properties and prevents any oxidization or wear or tear which is much needed for such an industry

Marking and form of delivery

It is not recommended therefore to try to test multiple assemblies in this test

an outlet diameter of 50 mm