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How to protect low voltage distribution systems?

Dec 13, 2018
Low Voltage Cabinet Device Fittings Primary Main Circuit Fixed Plug In.jpgMeasures such as protection zero and overcurrent protection devices installed in the current low-voltage power distribution system cannot completely prevent the occurrence of electric leakage fires. Therefore, a leakage protector dedicated to fire prevention should be installed at the building current total incoming line. In order to prevent large-scale power outage, the leakage protector should be separately installed in the main power distribution box and the user switch box. The rated operating current and rated action time should be reasonably matched to make it have the function of hierarchical protection.

The low-voltage power distribution system only provides indirect contact protection for single-phase 220V lines. At the same time, there are hidden dangers caused by mechanical wear, poor contact, short-lived quality and short life. It cannot be a reliable protection alone. Measures, therefore, the equipotential bonding should be implemented to effectively eliminate the arc and spark between the electrical circuit or equipment that leaks and the metal components with low potential, that is, eliminate the possibility of fire caused by the leakage voltage.

The low-voltage distribution system must prevent the insulation layer from being damaged. Low-voltage distribution system power distribution devices and electrical equipment and combustible materials should maintain a sufficient safety distance, and if they are inseparable, thermal insulation protection measures should be taken. After the completion of the construction project, the electrical installation of the low-voltage distribution system should be put into use after passing the test by a special inspection organization, and try to prevent the occurrence of leakage fire from the source.