8 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors
Note: Refer to the releasing device manufacturer’s installation instruction
for proper connections.
For Initiating Device Circuit (IDC) wiring (the wiring between
interconnected detectors), it is recommended that the wire be no smaller
than 18 American Wire Gauge (AWG) (1.0 square mm). However, the
screws and clamping plate can accommodate wire sizes up to 12 AWG
(3.3 square mm).
Smoke detectors and alarm system control panels have specifications for
allowable IDC wire type and maximum resistance. Consult the control
panel manufacturer’s specifications for the total IDC resistance allowed
for the control panel being used before wiring the detector IDCs.
Begin electrical connections by stripping about 3/8 inch insulation from
the end of the wire (use strip gauge molded in detector base). Then, slide
the bare end of the wire under the clamping plate and tighten the clamping
plate screw.
Note: Break the wire at each terminal to ensure that the connections are
supervised--do not loop the wire under the terminals.
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Figure 1: Electrical Connections
Contacts are shown in standby mode and will transfer in alarm condition.
The detectors are marked with a compatibility identifier located as the last
digit of a five digit code stamped on the back of the product. Connect
detectors only to compatible control units as indicated in the Device
Compatibility Technical Bulletin in the Fire Management Accessories
Manual (FAN 445).
The National Fire Protection Association (NFPA) 72-National Fire Alarm
Code defines the spacing requirements for smoke detectors. Typically,
this is 30 foot centers for mounting (maximum of 21 foot radius of each
detector) when the detectors are installed on a smooth ceiling no higher
than a foot. Room configuration and operating environment may require a
reduction in the standard maximum 900 square foot coverage for
each detector.
Spacing
