| 摘要 |
An electric device, such as a transformer, has a tank and an arrester for protection against high voltage surges, the arrester being grounded to a wall of the tank. A switch is mounted in the tank wall for enabling the ground connection to be disconnected from outside the tank. The switch includes a shaft extending slidably through an opening in the tank wall. A gripping handle is mounted on an outer end of the shaft, and a spring washer is mounted on an inner end of the shaft. The spring washer is electrically connected to a discharge side of the arrester and is movable toward the wall and into electrically conductive relationship therewith in response to sliding of the shaft. By sliding the shaft in a direction moving the washer away from the wall, the electrical connection is broken. The handle is threadedly mounted to the shaft to be reversible between a first position holding the shaft in its switch closed position, and a second position for enabling the shaft to be slid to its switch open position.
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