Installation
August 2007 2-2 P/N 06-236716-001
• Electrical wiring and conduit
• 4-inch electrical junction boxes (as required)
• Wire-nuts and crimp-on terminals (as required)
• Ground strap (for use when handling printed circuit boards)
2-2 INSTALLATION GUIDELINES
2-2.1 Electrical Connections
Take special care when installing the system and follow the guidelines given in the following
paragraphs.
Install electrical conduit and wiring in accordance with applicable National Electrical Code,
NFPA Standard and state and local building code requirements.
The incoming AC voltage must be stable and within the permissible voltage range. This is
especially important in new construction where incoming power may be high or unstable, and
temporary connections may cause large inductive voltage spikes.
Most supervised circuits use voltage or current sensing circuits that are sensitive to induced
voltages on the sensor wiring.
2-2.2 Grounding and Lightning Protection
CAUTION
Do not under any circumstances run AC power, speaker, PA, intercom or switch
control wiring with inductive loads in the same conduit or in the immediate vicinity
of sensor wiring. Control unit damage or malfunction may result.
CAUTION
The system should never be connected to a conduit or green wire circuit that is also
used to power resistance heating, motors, fans, air-conditioning equipment or
fluorescent lighting circuits. Leakage currents from these types of circuits into the
ground return could damage sensitive system components.
A separate earth ground or cold water pipe with properly bypassed water meter
should be used. All external devices such as horns or alarm bells should have their
housings grounded. All low-level signal cables should have foil shielding and a
drain wire to be installed in their own grounded metallic conduit.
Ground only one end of the drain wire or shield, since a ground on both ends will
provide a current path and thus subject the circuit to induced RF currents and
noise. A minimum alternative would be to use shielded #16 AWG twisted pair wire.
Adequate lightning protection must be provided for the incoming power at the
building entry. Arrestor circuitry and earth grounding should be in accordance with
article 250 of the National Electric Code.
There is no known protective device available that is capable of protecting
equipment from damage caused by a direct lightning hit due to the extremely high
energy released (10 million to 100 million volts at 10,000 to 30,000 or more
amperes). However, line surges from indirect strikes and voltage spikes induced
through power line load switching can be minimized by the addition of transient
suppressors.
Although the Kidde AEGIS circuits have transient protection devices, additional
protection is required in areas subject to above average lightning activity or
induced voltage spikes and fluctuations due to power line load switching.
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