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Section 3 - Installing the Control
3-25
Panel Earth Ground Connections
In order for the lightning transient protective devices in
this product to be effective, the designated earth ground
terminal (terminal 30) must be terminated in a good
earth ground. Recommended wire gauge for the ground
connection is #16 AWG, run no farther than 30 feet.
The following are examples of good earth grounds
available at most installations:
• Metal Cold Water Pipe: Use a noncorrosive metal
strap (copper is recommended) firmly secured to the
pipe to which the ground lead is electrically
connected and secured.
• AC Power Outlet Ground: Available from 3-
prong, 120VAC, power outlets only. To test the
integrity of the ground terminal, use a three-wire
circuit tester with neon lamp indicators, such as
the UL-Listed Ideal Model 61-035, or equivalent,
available at most electrical supply stores.
The panel requires the earth ground
connection for its lightning transient protection
devices.
Determining the Control’s Power Supply Load
Use the tables that follow to calculate the total current
for the Auxiliary Power, the Alarm Output, and the
Polling Loop. In each table, multiply each device’s
standby and/or alarm current by the number of units
used.
1. In Table 1, enter devices used on the polling loop.
Calculate total current draw on the polling loop.
Table 1: Total Polling Loop Current Draw
Polling Loop Device Current # of Units Total
Polling Loop Subtotal
(terminals 24 & 25 – 64mA) ✳
✳ The total current cannot exceed 64mA. If total load exceeds
64mA, then a 4297 Loop Extender Module can be used. Note
that the total number of points connected to the panel cannot
exceed 55.
2. In Table 2, enter devices used on Auxiliary Power.
Calculate standby and alarm currents, then add to
get Auxiliary Power current subtotal.
Table 2: Auxiliary Power Current Load
Total Current
Device
Model #
Device Current X
# of Units
Standby Alarm
Auxiliary Power Subtotal
(terminals 6 & 7 – 750mA max.)