How to Troubleshoot 3-Phase Power in Older Facilities

How to Troubleshoot 3-Phase Power in Older Facilities


Three-phase power systems are commonly used in industrial and commercial facilities to provide efficient and balanced power distribution. However, in older facilities, issues can arise with 3-phase power due to aging equipment, lack of maintenance, and obsolete wiring methods. As a facility manager, being able to effectively troubleshoot 3-phase power issues is an important skill for minimizing downtime and ensuring smooth facility operations. In this guide, I will provide an overview of 3-phase power and outline the steps involved in troubleshooting common issues in older facilities.

Overview of 3-Phase Power Systems

Common 3-Phase Issues in Older Facilities

Some common issues that can occur with 3-phase power systems in older facilities include:

Troubleshooting Process

When troubleshooting 3-phase issues, follow these key steps:

1. Visual Inspection

2. Check Voltages

3. Look for Phase Loss

4. Check Phase Rotation

5. Check Current Draw

6. Isolate the Problem

7. Contact Power Company

Preventive Maintenance

To help minimize 3-phase issues in older facilities:

When to Call a Professional Electrician

If the root cause of a 3-phase issue can't be identified, it's best to call in a qualified industrial electrician. They have the proper equipment and experience to diagnose and correct complex 3-phase problems. Vintage wiring methods in older buildings often complicate troubleshooting. Let the experts handle it to avoid safety hazards.


Troubleshooting 3-phase power issues in older facilities requires knowledge of 3-phase configurations, systematic testing, and isolation of problems. Voltage imbalance, phase loss, phase reversal, and ground faults are common issues that can arise. Both preventive maintenance and enlisting professional help when needed are key to minimizing 3-phase problems. This ensures reliable power delivery and avoids unnecessary downtime and damaged equipment.