ProSYS Installation and Programming Manual 17
Safety Precautions
When mounting the Main Panel, the following safety precautions are relevant:
When the Main Panel is powered on, mains voltage is present on the main PCB. To prevent
risk of electric shock, disconnect all power (AC transformer and battery) and phone cords
before servicing. Under no circumstances should mains power be connected to the PCB
other than to the main terminal block.
For AC mains connection, a readily accessible disconnect device shall be incorporated in the
building installation wiring.
The equipment should be installed in accordance with the National Fire Protection
Association's Standard #74 (N.F.P.A. Batterymarch Park, Qulncy, MA 02269) and local
National Electrical Codes.
For continued protection against risk of fire, replace fuses only with fuses of the same type
and rating.
There is a risk of explosion if a battery is replaced with an incorrect type. Dispose of used
batteries according to the proper instructions. (The Main Panel is designed to work with a
12 V, 7 Amp-hour sealed lead battery as a backup for the primary power supply.)
Do no short the terminals of the transformer together. This causes the internal fuse to blow.
The transformer must be connected to a 230 VAC, 24-hour outlet not controlled by a switch
other than an approved over-current protection device.
The Main Panel is designed with reverse polarity protection on the battery charging circuit.
However, prolonged improper connection of the battery to the Main Panel will result in
damage. The power should remain disconnected until all connections have been made
and checked for accuracy.
Discharging Static Electricity
Please note that it is important to discharge static electricity that may have built up in
your body before you touch a circuit. To do this, touch the earth. (Refer also to What
Makes a Good Ground? in Chapter 2, Mounting and Wiring the Main Panel.)
Following Local Regulations
Be sure to follow your local regulations regarding fire protection, electrical installation,
noise pollution, and security systems installation.
What Makes a Good Ground?
Grounding provides a degree of protection against lightning and induced transients for
any piece of electronic equipment that may, due to lightning or static discharge,
experience permanent or general malfunctions. The ideal ground is considered to be a
unified earth ground in which an 8-foot copper-clad rod, located close to the existing
power and telephone ground rods, is sunk several feet into the earth. Appropriate
hardware and clamps are then used to electrically connect each of these rods together
and then to the ground terminal of the device to be protected.
It may be possible to use an existing electrical ground on the premises if one is close
enough to the Main Panel. Ideally, that ground can be obtained at the metal service
panel where the incoming electrical power originates. When connecting the ground
wire, use a solid 14-gauge wire [or larger (numerically lower) size] connected between
the ProSYS's GND terminal and an acceptable electrical ground connection. Keep this
wire as short as possible and do not run it in conduit, coil it, bend it sharply, or run it
alongside other wiring. If you must bend it or change its direction, it should have a
radius of at least 8 inches at the point from which it is bent. If in doubt, you may want
to enlist the help of a licensed electrician in matters concerning such grounding.