SS EN 257 Ed. 1 (1992)现行

Describes the construction and performance requirements for mechanical thermostats for gas applications. Establishes the definitions, test conditions and marking. Applies to mechanical thermostats controlling the gas flow directly or indirectly through an integral gas valve, and which do not require external electrical energy for their operation. Applies to thermostats for all gas appliances. Excludes thermostats used with gas appliances installed in the open air.

UNE EN 257:1994 - Identical

NS EN 257:1992 - Identical

UNI EN 257:1994 - Identical

DIN EN 257 (1996-08) - Identical

ONORM EN 257:1996 - Identical

NF EN 257:1992 - Identical

I.S. EN 257:1992 - Identical

NBN EN 257:1992 - Identical

BS EN 257:1992 - Identical

NEN EN 257:1994 - Identical

SN EN 257:1997 - Identical