What is a common cause of electrical insulation deterioration?

Aging and environmental factors, such as exposure to ultraviolet (UV) light, are significant contributors to electrical insulation deterioration. Over time, insulation materials can break down due to chemical reactions triggered by UV light, leading to a loss of integrity and effectiveness. Aging is a natural process that affects all materials, causing them to become brittle, cracked, or otherwise compromised.

Environmental factors also play a crucial role; high temperatures, moisture, and pollutants can further weaken insulation. As a result, the combination of aging and exposure to environmental elements is a primary cause of insulation failure, making it imperative to consider these aspects when assessing the condition of electrical insulation.

The other options identify specific scenarios that could affect insulation but do not encompass the broader range of factors, particularly how aging and environmental exposure can lead to more extensive deterioration over time.