1.To under the condition of the insulation material basic damage appears to remove the danger of the insulation of the voltage to take protective measures.

2.Made of electrically charged part of the insulation has the certain requirement, must be enough resistance to wet conditions, such as the use of less susceptible to external factors and itself ability.

3.Insulation materials to have enough insulation performance, according to the different scope of application of the leakage current limit within the limit value of does not affect the security, to ensure safe and reliable equipment to prevent due to the current caused by the direct use of danger.

4.The last request whatever insulation parts should have the enough good heat resistance.