Which of the following involves an acceptable method for cleaning generating equipment insulation?

Cleaning generating equipment insulation is a critical maintenance task that helps ensure efficient operation and longevity of the equipment. The correct choice involves wiping with a clean cloth or approved solvent, which is appropriate for several reasons.

Using a clean cloth helps remove dust, dirt, and other particulates that may accumulate on insulation surfaces. The choice of an approved solvent ensures that any residues or contaminants that might compromise the insulation's effectiveness are properly removed without risking damage to the material itself. Not all cleaners are suitable for all types of insulation; therefore, selecting an approved solvent is essential in maintaining the integrity of the insulation.

In contrast, other methods listed may not be suitable. For instance, using dish soap and water could leave residues that may attract more dirt or potentially damage the insulation material. A dry cloth only might not effectively remove difficult contaminants or oils that can degrade insulation performance. Lastly, steam cleaning, while thorough, can introduce excessive moisture, which is often not advisable for electrical insulation materials, as it can lead to insulation failure.

Thus, wiping with a clean cloth or an approved solvent strikes the right balance of thoroughness and safety for cleaning generating equipment insulation.