Arc Flash Repair & Main Bus Bar Re-Tap: How We Restored Safety and Power

Arc Flash Repair & Main Bus Bar Re‑Tap – Safety Restored

Arc flash events are some of the most dangerous electrical incidents that can occur in a commercial or industrial facility. In a matter of seconds, an arc flash can damage equipment, shut down operations, and create serious safety risks for anyone nearby. In this project spotlight, we are sharing how our team responded to an arc flash event, repaired the damage, and safely restored power through careful main bus bar re‑tapping and breaker replacement.

This type of work requires a combination of experience, planning, and strict attention to safety procedures. From the first inspection to the final testing, every step must be done correctly to protect both people and equipment. Below is an inside look at what was involved in this recent repair project and why it matters for facility owners and managers.

What Happened: The Arc Flash Event

The job began after a facility experienced an arc flash inside one of its main distribution sections. The incident:

Damaged multiple breakers in the affected section
Compromised parts of the main bus bars and connections
Raised immediate concerns about equipment safety and system reliability

Although the event was contained, the equipment could not be trusted in its current condition. Before power could be restored, the damaged gear had to be inspected, repaired, and thoroughly tested.

Our role was to respond quickly, make the area safe, and return the system to reliable operation in a way that met current electrical safety standards.

Step 1: Inspecting and Assessing the Damage

The first step was a detailed inspection of the distribution equipment. Our technicians:

Performed a visual inspection of the gear, breakers, and bus bars
Identified any obvious burn marks, pitting, or melted insulation
Checked for mechanical distortion or misalignment caused by the fault
Documented affected components for repair or replacement

This assessment helped us determine how far the damage extended and which parts of the system could be repaired versus which components needed full replacement. It also guided our safety plan for working inside the gear.

Step 2: Safely De‑Energizing and Securing the System

Before any hands‑on work could begin, the system had to be fully de‑energized and verified as safe to work on. Our team:

Coordinated with the facility to schedule an outage window
Shut down and lock out the affected equipment following lockout/tagout procedures
Verified absence of voltage using appropriate test instruments
Established safe work boundaries around the equipment

Taking the time to properly de‑energize and secure the system is essential. In arc flash repair work, there is no room for shortcuts. Clear communication with the facility and strict adherence to procedures protect both our technicians and on‑site staff.

Step 3: Main Bus Bar Re‑Tapping

One of the most critical parts of this project was re‑tapping sections of the main bus bars that had been affected by the arc flash. Overheated or damaged bus bar connections can lead to future failures if they are not addressed correctly.

Our work included:

Cleaning and preparing affected bus bar surfaces
Re‑tapping connection points to restore proper thread integrity
Ensuring clean, solid contact surfaces for new hardware
Installing new hardware where necessary to guarantee a secure connection

Proper bus bar re‑tapping helps restore both mechanical and electrical integrity. Tight, clean connections reduce the risk of overheating, arcing, and future faults once the system is back under load.

Step 4: Replacing Damaged Breakers

The arc flash event left several breakers visibly damaged or compromised. Rather than attempting to reuse questionable components, we removed and replaced them with new, properly rated breakers.

During this step, our technicians:

Removed all breakers showing signs of thermal or mechanical damage
Verified ratings, interrupting capacity, and compatibility for new breakers
Installed replacements according to manufacturer specifications
Checked torque values and mechanical operation of each breaker

Using the correct replacement breakers is essential for ongoing protection. A main distribution system is only as safe as the overcurrent devices that protect it.

Step 5: Testing and Verifying System Integrity

After repairs to the bus bars and breaker replacement were complete, we moved into the testing and verification phase. Before the system could be re‑energized, we needed to be confident that it was safe and ready to return to service.

Our verification process included:

Visual inspection of all repaired and re‑assembled components
Checking clearances, insulation, and barriers inside the gear
Confirming proper installation of breakers, lugs, and terminations
Performing appropriate electrical tests to verify continuity and insulation resistance

Only after the equipment passed these checks did we proceed to re‑energize the system in a controlled and monitored manner.

The Importance of PPE and Experienced Technicians

Arc flash repair is not routine electrical work. It demands:

Proper personal protective equipment (PPE) based on the hazard level
A clear understanding of arc flash boundaries and safe approach distances
Knowledge of NFPA 70E principles and best practices for energized and de‑energized work
Experience working inside complex distribution equipment

Having an experienced team on site helps ensure that the repair process itself does not create new hazards. We take training, procedures, and PPE seriously on every job, especially after an incident like this.

Lessons for Facility Owners and Managers

This project is a reminder that arc flash risk is real and that prevention and preparation are critical. Facility owners and managers can reduce the likelihood and impact of similar events by:

Scheduling regular inspections and preventative maintenance on switchgear and distribution equipment
Ensuring terminations and connections are tightened and in good condition
Reviewing and updating arc flash studies and labeling as needed
Training staff on basic electrical safety awareness and reporting unusual conditions

Catch issues early, and you are far less likely to face unexpected outages, equipment damage, or safety incidents.

Need Help After an Electrical Incident or Want to Reduce Arc Flash Risk?

Whether your facility has already experienced electrical damage or you want to be proactive about preventing arc flash events, our team is ready to help. We can:

Respond to emergency electrical issues and equipment failures
Inspect and repair damaged distribution equipment, breakers, and bus bars
Provide maintenance and recommendations to improve system reliability and safety

If you are responsible for a commercial or industrial facility in the Triangle or surrounding areas, reach out to schedule an assessment or discuss your electrical safety concerns. Having a qualified electrical partner on your side can make all the difference when it comes to preventing problems and responding effectively when they do occur.