Customer

AEP

Location

West Virginia

Highlights

  • Wire sizing error identified before installation
  • Coordination with engineering team prevented schedule impact
  • Avoided over-engineering and preserved safety integrity

Proactive Oversight Resolves Wire Sizing Conflict in Substation Upgrade

The Challenge

While overseeing the installation of a new station service feed, Think Power Solutions identified a design discrepancy in the engineering prints. The prints specified 750 MCM copper wire to be used with a 400-amp disconnect box. However, based on previous project experience, our construction oversight team questioned whether the disconnect lugs could accommodate this wire size.  Given the critical nature of station service and the risks of incorrect installation, including delays, rework, and safety issues, early verification was essential. Additionally, this project had already experienced a five-year scheduling delay, with multiple contractor and material turnovers, further raising the stakes. 



Root Cause Analysis
 

  • Design Oversight: Engineering prints specified a wire gauge incompatible with the lug size on the specified disconnect box. 
  • Legacy Planning Issues: The long delay in project execution introduced coordination gaps in equipment specifications and supply chain. 
  • Potential for Delay: Proceeding without verification would have led to rework, schedule disruption, or unsafe installations. 

The Solution

Engineering Validation 

Our team proactively reached out to the engineering lead to review the design. A joint investigation with station supervisors confirmed the incompatibility between the disconnect lugs and the specified 750 MCM wire. 

Voltage Drop Study and Wire Size Adjustment 

A new voltage drop study was conducted. It confirmed that 500 MCM copper wire would provide adequate capacity for the station feed, ensuring both compliance and performance. The adjusted wire size was approved and integrated into the project. 

Maintaining Schedule and Outage Plan 

This change prevented delays, allowed the contractor to maintain the outage schedule, and kept the project on track. 

Key Benefits

  • Time & Cost Savings: Avoided costly rework and potential material waste 
  • Schedule Adherence: Outage window maintained with no impact to customers 
  • Improved Design Fidelity: Field feedback loop helped validate engineering assumptions 
  • Safety Assurance: Equipment was installed properly without forcing improper fits 

The Results

The issue was resolved with zero impact on the construction schedule or budget. The proactive validation of field conditions against engineering documentation showcased the value of real-time construction oversight. As a result, the substation upgrade moved forward safely and efficiently, saving time, cost, and client resources. 

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