Primary leakage protection system

When the leakage protector is classified protection, it should meet the selectivity of the upper and lower levels.Generally, the rated leakage action current of the upper level leakage protector should not be less than the rated leakage action current of the lower level leakage protector, or 2 times of the normal leakage current of the protected line equipment.

Secondary leakage protection system

The secondary leakage protection system means that the electricity system shall at least set the secondary leakage protection of the main distribution box and the switch box. The rated leakage operating current and rated leakage operating time of the secondary leakage protection device in the main distribution box and the switch box shall be reasonably coordinated to form the classified and subsection protection.Leakage protection device should be installed in the main distribution box and switch box close to the load side, that is, the electric circuit first through the knife power switch, then to leakage protection device, can not be installed back;Leakage protection device shall meet the following requirements: rated leakage action current ≤30mA, rated leakage action time ≤0.1s, rated leakage action current ≤15mA, rated leakage action time ≤0.1s for the leakage protection device used in damp places;The rated leakage operating current of the leakage protector in the main distribution box shall be greater than 30mA, and the rated leakage operating time shall be greater than 0.1s, but the product of the rated leakage operating current and the rated leakage operating time shall not be greater than 30mA.The leakage protector shall be sensitive in action and shall not fail to operate or misoperate.