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Most homes are wired with both 15-amp and 20-amp receptacles. 15-amp outlets have a u-shaped grounding hole and two slots. 20-amp receptacles have a horizontal slot that branches off from the vertical slots. 20-amp outlets work with appliances, such as microwaves, and must operate on a 20-amp circuit.
Some duplex outlets allow for back wiring instead of side wiring because it is generally a much simpler process. However, back wiring is not as secure as a side wiring connection. We recommend installing a duplex receptacle with both type of connectors.
The Americans with Disabilities Act (ADA) mandates that unobscured outlets must measure between 15 inches and 48 inches from the floor.