How to Wire Three Phase 400V Distribution Board

Distribution Board or DB is an electricity supply system or a common enclosure that distributes the electrical power feed into subcircuits it isolates the circuit during fault conditions due to current leakage as well as during earthing electric shock when somebody comes to contact with phase and earth.
what is a three phase line
In electrical engineering three phase electric power systems have at
least three conductors carrying alternating current voltages that are
offset in time by one third of the period. A three phase system may be
arranged in delta ? or star Y also denoted as way in some areas.

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