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ELECTRICAL SAFETY DESIGN |
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Single-Throw Knife Switch |
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| Switches provide a means for turning power on and off to equipment or
circuits. Single-throw knife switches have one energized (closed or "ON") position and one open (dead or "OFF") position. The switch must be designed so that when it is in the open position, the blades are not energized (connected to the load side, not the supply side of the circuit). Switches must also be installed so that if the switch falls downward, it will not fall into its energized position. However, some single-throw knife switches are designed to be installed so that they open upward, but these must have a latch or other locking device used to secure the switch in the open position.
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