HySecurity HTG 320-2, Installation And Maintenance Manual

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Installation and Maintenance Manual
50
Wire Size Schedules
For 1/2-hp through 5-hp motors
Supplying a gate operator with the right electrical service is crucial to the way the performance of the
operator the life of its electrical components. If the wire size used is too small, the voltage loss,
especially during motor starting, will prevent the motor from attaining its rated horsepower. The percent
of horsepower lost is far greater than the percentage of the voltage loss. A voltage loss could also cause
the control components to chatter while the motor is starting, substantially reducing their life due to the
resultant arcing. There is no way to restore the lost performance resulting from undersized wires, except
to replace them; therefore it is much more economical to choose a sufficient wire size at the initial
installation.
The tables on the following page are based on copper wire and allow for a 5% voltage drop. The
ampere values shown are the service factor ampere rating (maximum full load at continuous duty) of the
motor.
Always connect electrical power and ground the operator in accordance with the National Electrical
Code, articles 430 and 250 plus other local codes that may apply.
The maximum distance shown is from the gate operator to the power source; assuming that source
power is from a panel box with adequate capacity to support the addition of this motor load. The values
are for one operator, with no other loads applied to the branch circuit. Avoid placing more than one gate
operator to a circuit, but if you must be certain to reduce the maximum allowed distance by half.
Low Voltage Control Wiring
:
The Smart Touch controller has very sensitive control inputs so the wire size of the control wiring is not a
significant issue. The following is a chart of maximum distances for the controls:
Wire Size Maximum Distance
18 ga 7.0 miles
20 ga 3.5 miles
22 ga 2.7 miles
24 ga 2.0 miles
26 ga 1.0 mile
28 ga 3700 feet