1.5 These requirements, where applicable, also cover all remote accessories that are to be connected.

1.6 This standard does not cover the following:

1. a) Smoke detectors of the non-self-contained type that are intended for connection to a household or industrial system control unit. These are included in the Standard for Smoke Detectors for Fire Protective Signaling Systems, UL 268;

2. b) Mechanically operated single and multiple station fire alarm devices that are specified in the Standard for Single and Multiple Station Heat Alarms, UL 539;

3. c) Heat detectors – except for the requirements in the Fire Test – Smoke Alarm with Supplementary Heat Detection, Section 72, incorporated as part of a single station smoke alarm assembly whose requirements are covered in the Standard for Heat Detectors for Fire Alarm Signaling Systems, UL 521 or and/or when part of a multi-criteria smoke alarm.

4. d) An accessory that is provided with a means to transmit alarm signals to a constantly attended, remote monitoring location. Any accessory capable of transmitting these types of signals is covered by the requirements in the Standard for Household Fire-Warning System Units, UL 985 or;

5. e) A gas and vapor detector or sensor incorporated as a part of a smoke alarm assembly and covered by the Standard for Single and Multiple Station Carbon Monoxide Alarms, UL 2034, or except when part of a multi-criteria smoke alarm.