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Mode 1 - Direct application of power. 12V AC or DC is applied to the unit; the sound plays for the duration of the applied power. Mode 2 - Triggered by an isolated contact. The unit is permanently powered from 12V AC or DC.
10 Σεπ 2024 · This Bell SG1 unit provides an extension of the call tone on a door entry telephone. In addition to an output of 80 dB at one metre it has 8 user selectable tones. The unit can be triggered either from a 12 Volts source or from a switch.
The 900 Series door entry systems are recognised for their high quality and competitive pricing and are widely accepted as the industry standard. Each system provides all of the components necessary to install a complete audio door entry system; including a surface lock release as standard.
The bellissimo digital system is supplied with a dedicated door controller, for each entrance, and a video controller for every four videophones. The basic system supports 1 videophone per address, and up to 3 extension videophones (more with additional power supplies).
For your door entry and access control needs, Bell System is the trusted UK choice. Shop your door entry systems today by following the product links on this page. Special Trade offers on all bell system door entry systems, including intercom panels and door entry kits.
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2 Σεπ 2024 · 6.3.2 Fire alarm panel. a. An electrical fire alarm system of the automatic or manual type shall be provided with a fire alarm panel to indicate the location of the alarm which has been actuated or operated. Such an alarm panel shall be accurate to the maximum allowed alarm group area limitations specified in SS 645.
