Andover Controls CMX 240 Series User Manual

CMX 240 Series Installation Guide 7
Warning
Be sure to have your grounds inspected before you begin the
installation process to be sure your municipality follows the National
Electrical Code. Many municipalities do not and often have
substandard electrical grounds.
An example of a substandard ground is a galvanized steel cold water
pipe. As the pipe corrodes, it does not act as a true ground. The corro-
sion acts as an insulator, raising the potential of the pipe with respect to
the ground.
When lightning strikes in the area of the installation, it drastically
changes the potential of the earth.
Since properly grounded Andover Controls units respond to changes in
potential more rapidly than poorly grounded electrical systems, a poor-
ly grounded building tries to reach ground through the Andover
Controls system. The surge of current can destroy electronic compo-
nents on the controller board. Surges of much lower potential than
lightning also impact the reliability of Andover Controls equipment.
Inspecting the Ground
You can check your ground as follows:
1. Check your ground by first inspecting the building power
distribution panel for earth ground termination. If the ground
termination is any of the following, it is not adequate and must be
corrected:
• Does not exist.
• Is connected to a corroded or galvanized pipe.
• Is connected using a small gauge wire (less than 14 AWG).
2. Be sure your Andover Controls cabinet is connected to the ground
with a copper conductor that terminates at the distribution panel.
Technical Manuals Online! - http://www.tech-man.com
firealarmresources.com

Andover Controls CMX 240 Series Specifications

General

Brand	Andover Controls
Model	CMX 240 Series
Category	Controller
Language	English