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SECTION 4: 120VAC ELECTRICAL WIRING SAFETY
Follow all safety warnings if installing AC power for charging purposes. Board operates only from DC power.
• Disconnect power to the gate operator by manually opening its dedicated circuit breaker before making
any mechanical or electrical adjustments.
• Use a 20 amp dedicated circuit breaker for each installed gate operator.
CAUTION!
DO NOT WIRE AC POWER TO
THE CONTROL BOARD! THE
CONTROL BOARD OPERATES
ON DC VOLTAGES ONLY!
DANGER!
TO REDUCE THE RISK OF SEVERE
INJURY AND DEATH FOLLOW ALL
SAFETY PROCEDURES!
DANGER!
DO NOT WIRE AC MAINS
POWER TO METAL CONTROL
BOX WITHOUT EARTH GROUND
CONNECTION!
GROUND
FIGURE 4-1: 936
CONTROL BOARD
GROUND LOCATION
4.1
HIGH VOLTAGE WIRE GAUGE REQUIREMENTS
Use Table below to determine high voltage wire size requirements.
Distance shown in the chart is measured from the operator to the power source. If power wiring is greater than
the maximum distance shown, a service feeder is recommended.
When large gauge wire is used, a separate junction box must be installed for the operator connection.
Wire table is based on stranded copper wire. Wire run calculations are based on a 110 VAC power source with
a 3% voltage drop on the power line, plus an additional 10% reduction in distance to allow for other electrical
losses in the system.
110V/AWG GAUGE
MAX RUN
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INSTALLATION AND PROGRAMMING MANUAL
LUG
TABLE 4-1: MAXIMUM RUN PER WIRE GAUGE
14
180 FT
(54.8m)
CBOX936
• Open dedicated circuit breaker supplying power to
gate operator before a new installation or making any
modifications to an existing installation of this gate
operator.
• All wiring connections must be made by a qualified
individual.
• Run individual circuits in separate U.L. Listed conduits.
Do not combine high voltage (120vac) power wiring
and low voltage (+12vdc to +24vdc) control wiring in
the same conduits.
IF AC POWER IS BEING RUN INTO THE CONTROL
BOX FOR CONVERSION TO DC, THE GATE
OPERATOR SYSTEM SHOULD BE GROUNDED
THROUGH THE EARTH GROUND IN THE AC
MAINS WIRING SYSTEM (GREEN WIRE). This
ground connection will prevent dangerous currents
from appearing on the metal control box, the actuator,
or the gate itself.
Nice recommends an 8 foot copper rod driven all the
way into the ground with a copper clamp and 12ga
copper wire minimum.
Connect ground wire to the grounding lug on the
lower left corner of the 936 control board (FIGURE
4-1). Alternatively, bonding of the control box can be
done by drilling a hole in the control box, removing
the powder coating around the hole, and bonding the
copper ground wire to that area with a bolt.
12
10
280 FT
460 FT
700 FT
(85.3m)
(140m)
(213.3m)
8
6
4
1150 FT
1800 FT
(350.5m)
(548.6m)
11
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