Each place is slighty diffrent so it will varies a bit but really most common is 36 hight and useally from 12 to 18 inch away from the unit unless have multi units then i group the disconnect switch if in line of sight other wise spec ed.
Roof ac disconnect.
An ac disconnect also known as a fuse box or switch box is for controlling the breakers and fuses that lead to your air conditioner.
Nec 440 13 disconnect for room air conditioners or heat pumps paraphrasing.
There are 3 standard designs non fused fused and a molded case switch.
The hight of the disconnection switch is no higher than the a c unit typically 36 inch up from roof line.
Devices are available in fused non fused molded case switch or three phase designs and in metal or plastic enclosures for all application.
The disconnecting means shall be permitted to be installed on or within the air conditioning or refrigerating equipment.
The best ac disconnects are outdoor rated provide easy access to the interior and are built to last.
The disconnecting means must be within sight of the transformer unless the location of the disconnect is field marked on the transformer and the disconnect is lockable click here to see fig.
The air conditioner or heat pump unit disconnect must be within sight from and readily accessible from the unit.
Acds provide a visible disconnecting means when performing maintenance and are commonly referred to as disconnects pullouts or air conditioning switches.
An air conditioning disconnect acd provides an installer or repair personnel with a visible disconnecting means while performing maintenance on an air conditioning unit.