How often should amperage and voltage tests be performed on three-phase motors?

• A. Monthly
• B. At least every 3 months
• C. At least every 6 months
• D. At least once per year

Answer: (B)

Regular electrical performance checks are essential for three-phase motors because amperage and voltage readings reveal changes in motor loading, winding condition, and supply quality. By comparing actual current to the motor’s expected full-load current and checking how evenly the three phase voltages are in balance, you can spot overloads, undervoltage, loose connections, or winding faults before they cause overheating or failure. Performing these tests at least every three months keeps maintenance aligned with how often equipment in many systems, like water treatment pumps and mixers, should be inspected for developing issues. If readings drift outside tolerance—current rising toward or beyond full-load levels or noticeable voltage imbalance—inspect and address the cause promptly to protect motor life and system reliability.