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(3) Miscellaneous checks. Check supporting de­vices such as protective relays and controls as cov­ered in chapter 11 and as follows:

(a) Test key interlock systems by a key ex­change made with devices operating in an off-normal position to ensure that they have not been bypassed. A closure attempt is required on locked-open devices and an opening attempt is required on locked-closed devices.

(b) Finally, compare equipment nameplate information with latest one-line diagram and report discrepancies.

8-16. Maintenance of low-voltage power cir­cuit breakers.

The following guidelines are provided for mainte­nance of low- voltage circuit breakers. Also follow the manufacturer's detailed instruction.

a. Maintenance. Maintenance is given for drawout circuit breakers. Modify instructions, as required, if circuit breakers are of the fixed type. (1) Initially check that the circuit breaker is in the test position, prior to withdrawing it from its enclosure.

(2) Clean insulating parts, including bushings.

(3) Check the alignment and condition of the movable and stationary contacts, and adjust accord­ing to the manufacturer's instruction book.

(4) Check arc chutes and replace any damaged parts.

(5) Inspect the circuit breaker operating mechanism for loose hardware and missing or bro­ken cotter pins. Examine the cam, latch, and roller surfaces for damage or wear.

(6) Clean and lubricate the operating mecha­nism with a light machine oil (SAE-20 or SAE-30) for pins and bearings.

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