usually most light switches sit between 42'' and 48''
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I do not believe there is any code restrictions (USA) on the height above the countertop unless a particular locality has added such a restriction Common sense should be used as practical so that one's head does not hit the light while working at the countertop
The standard height is around 12" to 15" the bottom of the box above the floor but for the disabled you can install them higher but no more than 48" above the floor. Pick a height that will work for the disabled and install all of them the exact same height.
You must have a switch to turn the disposal on and off. If you are asking how to connect because you do not have a switch. Install the switch under the sink just above the door opening. You can buy disposals that turn on and off when you place the lid over the hole. InSinkerator makes one.
The height is usually based on the type of mirror that is to be installed above the sink. Take the height of the sink plus the height of the mirror and add 6 inches to find the center for the placement of the fixture junction box. If there is to be a space between the sink and the mirror add that measurement in to factoring of the height.
There is no set height. Most smaller surfaces can be lit at about 28" above the surface top, while larger surfaces may warrant a height of 32 to 34 inches. The farther away the light is, the larger pool of light it casts, but the less bright it is. Anywhere from 28 to 34 inches is best for most situations. It is really your choice.