Specification for underground fire hydrants and surface box frames and covers Ingestion-build-61878 Alloy groups

Alloy groups

This International Standard defines characteristics of a thermometer shield/screen

Resistance Unbalance is a measure of the difference in resistance between the two conductors in a cabling system

b) Method B — Determination of the 25 %-40 %-65 %/30 s indentation hardness characteristics

additional provisions may be required

Specification for underground fire hydrants and surface box frames and covers Ingestion-build-61878 Alloy groups1 Scope This British Standard specifies the operational and health and safety requirements for underground fire hydrants conforming to the dimensional, material and performance requirements of BS EN 14339 and BS EN 10746. It also includes specific national requirements not included in BS EN 14339 and BS EN 10746. This British Standard applies to underground fire hydrants: a) to be installed in a water supply system; b) size DN80; c) suitable for a