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Tests on some
of these items may be necessary at times, particularly after a faulty operation. These tests will have to be conducted when the machine or equipment being controlled can be removed from service. Monthly inspection should be adequate. Annual testing of the insulation will detect defective wiring before the insulation breaks down.
e. Thermally-operated devices. Thermostats, thermal overload units, and temperature devices operate on the heating effect of electric current. Inspect units about once a month for dirt, excess heating, freedom of moving parts, corrosion, wear, and condition of the heating elements. As elements which normally operate only when an overload or trouble takes place in the equipment being controlled, they must be in good operating condition at all times.
/. Motor-operated devices. Motor-operated timers, thrusters, valves, and brakes are included in this category. Periodic inspections should be made for evidence of dirt, heating, corrosion, wear, noisy operation, and vibration. Such inspections should ensure correct voltage, freedom of moving parts, proper lubrication, adequate gaskets, and satisfactory condition of gearing. Cleanliness is particularly important in mechanical linkages. Trial operation of moving parts may be necessary to detect trouble. As this may necessitate temporary removal from service, actual operation tests if necessary should be coordinated with scheduled equipment outages. Monthly inspections should be satisfactory, but for extremely dirty locations more frequent inspections are desirable.
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