Measuring relays and protection equipment - Functional requirements for frequency protectionWhat is this standard about? This part of IEC 60255 specifies the minimum requirements for functional and performance evaluation of frequency protection. This document also defines how to document and publish performance test results. This document covers the functions based on frequency measurement or rate of change of frequency measurements. This document also covers frequency protection where additional blocking elements are used. This document

together with corresponding grade designations

d)      LPG pipework installed in leisure accommodation vehicles and for accommodation purposes in vehicles in accordance with BS EN 1949

Why should you use PAS 402 - Specification for performance reporting on waste resource management

or electrical equipment to be used in an explosive atmosphere

Hot potable and non-potable water supply (up to 110 degrees C)

to ensure safe and efficient operation of the maritime works

and describes a widely applicable approach to achieving software trustworthiness which is based on the following concepts:

BS EN 60974-11 is applicable to electrode holders for manual metal arc welding with electrodes up to 10 mm in diameter

the purchase and/or control of the incoming materials should guarantee that contaminated or damaged material does not enter the process in sufficient quantity to affect the properties of the recyclate

BS EN 14600 identifies the particular requirements and classifications necessary to demonstrate the characteristics of fire resistance

Note 1: For other terms

1 Determination of minor constituents by AAS flame technique