Which of the following is a potential cause for poor insulation resistance readings?

Poor insulation resistance readings can often be attributed to the presence of moisture and dirt, as these elements can significantly diminish the effectiveness of insulation materials. When moisture infiltrates an insulator, it effectively short-circuits the insulating properties by providing a conductive path for electrical current. Similarly, dirt and contaminants can contribute to this issue by creating varying degrees of conductivity across the surface of the insulation.

In environments where moisture and dirt are prevalent, the risk of insulation degradation and reduced resistance increases, leading to failures or malfunctions in the electrical systems. Thus, ensuring that insulation is kept clean and dry is critical for maintaining optimal performance and safety in electrical applications.