Question 1
A feeder is installed using 3 single-conductor cables in metal conduit supplying a non-linear load with significant third-harmonic currents. What is a key consideration for the neutral conductor?
Question 2
A 100A residential subpanel is being installed in a detached garage. According to Canadian practice, how must the neutral and ground conductors be handled in this subpanel?
Question 3
A three-phase, 347/600 V lighting panel supplies multiple electronic ballasts. The neutral conductor in the feeder is overheating, even though the phase conductors are below their allowable ampacity. Measurements show high triplen harmonics. What is the most appropriate corrective measure?
Question 4
During commissioning of a three-phase panel, you discover that neutral currents are unusually high even though phase currents are balanced and loads are mostly electronic. Which is the most likely cause?
Question 5
A fire pump controller requires a reliable power supply. Which installation practice BEST supports the required reliability of this circuit?