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Page 194

| Figure 10-17 Voltage-detecting device: (A) Voltage tester (60 to 7,500 V), and (B) statiscope overhead type. |

| Maintenance |

| For air switches, maintenance work centers mainly on the contacts. It must make sure that the contacts between blades and stationary contacts are made smoothly and evenly, that the pressures exerted meet the specifications, and that the movable parts move freely. Mechanisms should be adjusted to maintain full contact on all poles of a multipole switch as simultaneously as possible. Hinges should be lubricated but kept sufficiently stiff so that when the blades are open, they will not fall back on the live stationary contacts. Other parts that rotate, linkages and so forth, should also be lubricated. Contacts should be cleaned of dirt and dressed; oxides and pittings and line contacts |

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