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In many installations the switch can be used as the ground block. To be used properly in this manner, your switch should be located in a position that satisfies National Electrical Code requirements for the placement of a ground block. For most installations, this will be where the external wiring enters the structure. If this placement is inconvenient, or you wish to mount the switch indoors, use an actual ground block as recommended by the NEC. Some switches may also function better if they are grounded, and you may wish to do this by running a ground wire from the switch to the point where your electrical service enters the building, or to a nearby cold water pipe.
Note: grounding your switch or ground block to a place other than the ground rod where your electrical service enters the structure may result in ground loops and/or the danger of shock from stray electrical currents. Contrary to popular belief, not all grounds are at the same potential. See: What is a Ground Loop?
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