8 Conventional Products—2400AT and 2400AIT Direct 2-Wire Smoke Detector
National Fire Protection Agency (NFPA) 72-National Fire Alarm Code
defines the spacing requirements for smoke detectors. Typically, this is
30 feet when the detectors are installed on a smooth ceiling. However, all
installations must comply with NFPA 72-National Fire Alarm Code
and/or special requirements of the authority having jurisdiction. Where
conditions or response requirements vary, other spacing may apply.
All wiring must comply with the National Electrical Code, the applicable
local codes, and any special requirements of the authority having
jurisdiction, using the proper wire gauges. The conductors used to connect
smoke detectors to control panels and accessory devices should be color-
coded to reduce the likelihood of wiring errors. Improper connections can
prevent a system from responding properly in the event of a fire.
For Initiating Device Circuit (IDC) wiring (the wiring between
interconnected detectors as well as the control panel), it is recommended
that the wire be no smaller than No. 18 American Wire Gauge (AWG)
(1.0 square mm). However, the screws and clamping plate in the base can
accommodate wire sizes up to No. 12 AWG (3.3 square mm).
For best system performance, the power (+ and –) wires should be a
twisted pair and installed in a separate grounded conduit or shielded cable
to protect the IDC from extraneous electrical interference. If a cable shield
is provided, the shield connection to and from the detector must be made
continuous by using wire nuts, crimping, or soldering, as appropriate for a
reliable connection.
To make wire connections:
1.
Strip about 3/8 inch insulation from the end of the wire.
2.
Slide the bare end of the wire under the clamping plate.
3.
Tighten the clamping plate screw.
Note: Do not loop the wire under the terminals.
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).
Spacing
Wiring
Installation
Guidelines
