Which of the following steps is not required for sliding-type contact relays and circuit breakers if a bright surface is visible on the contact?

The correct choice indicates that tarnish removal is not necessary when a bright surface is observable on the contact of sliding-type contact relays and circuit breakers. A bright surface typically signifies that the metal is clean and free of significant corrosion or oxidation. In this context, tarnish refers to a layer of discoloration or oxidation that forms on metal surfaces, which can impede electrical conductivity. If the surface appears bright, it implies effective contact and functionality, reducing the urgency for tarnish removal.

Surface cleaning and lubrication can be important maintenance tasks to ensure optimal operation and longevity of electrical contacts. Inspection for damage is also vital, as it helps identify any mechanical wear or physical damage that could affect performance. Thus, while those actions contribute to overall maintenance, they are not obligatory if a bright surface is present, confirming the functionability of the relay or circuit breaker.