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Remove any moisture by filtering before the oil is used. Always test the oil before putting back in service a recloser which has been temporarily removed for repair. Replace with clean dry oil if the dielectric strength of the oil is less than 22 kilovolts rms.

(2) Vacuum interrupting units. Leaks caused by excessive mechanical strain, insufficiently degassed contact materials, or other causes may decrease the unit's dielectric strength. The dielectric strength of the vacuum gap can be tested with a 60-hertz high-potential test at the manufacturer's recommended voltage.

(a) Adjust vacuum contacts for proper contact opening travel, contact closing overtravel, and contact closing force, according to the manufacturer's recommended procedure.

(b) X-radiat'ion may be produced when vacuum interrupters are energized above maximum rated voltage. Follow the manufacturer's required precautions.

(3) Units insulated with SF, gas. Follow the manufacturer's recommendations as to the insulating medium treatment.

(4) Tests. Test in accordance with the limits set by the manufacturer and in accordance with ANSI/IEEE C37.60.

(a) Insulation. Aging, moisture, and the sludge deposits can cause insulation on fiber parts and wiring to deteriorate. Test insulation by a 60-hertz high-potential test, by power factor measurement, or by dc insulation tests.

(b) Minimum tripping current. Make a minimum tripping current test to determine that the recloser trips at the proper current value.

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