Earth Ground Rod; Power Wiring - Chamberlain EL1SS Installation And Programming Manual

INTRODUCTION

EARTH GROUND ROD

To AVOID damaging gas, power or other underground utility
lines, contact underground utility locating companies BEFORE
digging.
Connect the green ground wire to the grounding rod.
Run the wire from unit to suitable earth ground.
NOTE: Shield connections on boards should not be
connected to ground wire.
IMPORTANT: An earth ground rod is strongly recommended
and should be no further than 12 feet from the unit and
use a minimum of 12 gauge wire in most cases. The type
and length of earth ground rods vary by region. Contact the
building inspector's offi ce in the municipality where you
plan to install the unit for correct grounding materials and
installation procedures.

POWER WIRING

The 110 Vac outlet must be dedicated to the unit only. This outlet
should be wired back to its own 10 Amp minimum circuit
breaker. This will prevent two problems:
• Other equipment cannot introduce spikes, noise, surges, or
dips into the power circuit.
• The system's operation will not be affected if any other
equipment develops a short circuit across the power line.
Connect the transformer into a 110 Vac outlet after all
connections have been made, any other type of outlet will cause
damage to the system.
POWER WIRE TABLE
DISTANCE
Under 30 feet
30 - 75 feet
75 - 150 feet
150 - 250 feet
250 - 500 feet
NOTE: LiftMaster is not responsible for conflicts between the
information listed in the above table and the requirements of local
building codes. The information is for suggested use only. Check local
building codes before installation.
INSTALLATION
AC POWER WIRE SIZE
18 AWG
18 AWG
18 AWG
16 AWG
12 AWG
TESTING
NOTE: Keep ground wire as
straight as possible.
12 feet maximum
Check national
and local codes
for proper depth
Earth ground rod
11
PROGRAMMING
Ground wire
12 AWG minimum
Other ground sources within
12 feet of access control panel
Ground to
metallic cold
water pipe
Ground to
existing
electrical
system
Dedicated 10 Amp Minimum Circuit Breaker
12 Vac
Power (included)
The EL1SS
MUST be
Dedicated Outlet
grounded.