Controlled Products Systems Group HRG 220-A ST - Manual (Page 80)

Installation and Maintenance Manual
66
APPENDIX
For ½ -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, article’s
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.