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| Figure 10-2 Oil switch: (A) Open position, and (B) closed position with tank removed. |

| necting devices available, but they are also one of the more costly. Size for size, they are considerably more expensive in first cost than air switches and also in operating and maintenance expense. |

| Oil switches are especially suitable for underground application and any situation where water, moisture, salt atmosphere, or chemical or other pollution makes air switches impractical. |

| The tanks and operating handles of oil switches should be effectively grounded. Provisions should also be made for locking the operating handles in the open or closed positions. |

| Air Switches |

| Switches of this type can be classified into two categories: disconnects and air-break switches. |

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