scope:

Gives guidance on the selection, installation, use and maintenance of electrically operated Group II apparatus intended for use in industrial and commercial safety applications for the detection and measurement of: - combustible gases as described in EN 50054, EN 50057, EN 50058 or - oxygen as described in EN 50104. It is applicable to all new permanent installations and, where reasonably practicable, to existing permanent installations. It is also applicable to temporary installations, whether new or existing.