Insulation resistance testing is a method used to measure the resistance of electrical insulation in cables, motors, and other equipment. This test helps ensure that the insulation is effective in preventing electrical leakage, which can lead to short circuits or equipment failure. A specialized device called a megohmmeter applies a high voltage to the insulation and measures the resulting current flow, providing a resistance value. The results of insulation resistance testing are crucial for maintaining safety and reliability in electrical systems. A high resistance value indicates good insulation, while a low value suggests potential issues that may require further investigation or repair. Regular testing can help prevent accidents and extend the lifespan of electrical equipment.