6.Quality and Technology Standards 6.1.The insulation resistance of busbar should comply with the following requirement: use the 2500v/1000v megameter to measure the insulation resistance of busbar and the measured resistance value should be no less than 100 MΩ.6.2.The test voltage (actual value) should be 75% of the factory default and the voltage-exerting time should be one minute.The test results showed no breakdown of the busbar.