Free Standards Library

UL 539-2009 pdf download - Single and Multiple Station Heat Alarms. 3 Glossary 3.1 For the purpose of this standard the fllowing definitions apply. 3.2 ALARM SIGNAL - An audible signal intended to indicate an emergency fire...

UL 539-2017 pdf download - Single and Multiple Station Heat Alarms. 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the...