South Dakota State University (SDSU) is testing mixed reality headsets to help electrical contractors visualize conduit placements in commercial buildings, potentially eliminating one of the most persistent coordination challenges on complex construction sites. The research, led by assistant professor Yilei Huang of the Department of Construction and Operations Management, applies mixed reality technology to solve the problem of limited visibility in tight ceiling plenums where electrical conduits compete for space with HVAC ducts, water pipes, and fire protection systems.
This approach builds on broader trends in virtual reality technology in construction planning that are reshaping how builders coordinate complex building systems before breaking ground. The SDSU study moves beyond VR into mixed reality, where digital models overlay the real physical environment in real time.
How Mixed Reality Differs from Virtual Reality in Construction Applications
Mixed reality occupies a distinct position on the reality-virtuality spectrum that has significant implications for onsite construction work. Unlike virtual reality, which immerses the user entirely in a digital environment, mixed reality allows the wearer to see the physical world with digital content superimposed on it.
Key distinctions between mixed reality and virtual reality
- Environmental awareness: Mixed reality headsets allow users to maintain full situational awareness of the jobsite, including moving equipment, other workers, and site hazards. Virtual reality blocks out the physical environment entirely.
- Spatial registration: Mixed reality systems can anchor digital models to specific physical locations, enabling contractors to see a projected conduit layout exactly where it will be installed in the actual building.
- Mobility: Mixed reality headsets are wearable and hands-free, allowing contractors to walk through spaces, point at locations, and take measurements without holding a tablet or laptop.
- Collaboration potential: Multiple stakeholders can view the same digital overlay simultaneously, facilitating real-time coordination between electrical, mechanical, and plumbing trades.
As Huang explained, “With virtual reality, you cannot see the actual world, just the digital content. With mixed reality, you see what is in front of you plus the digital content.” This distinction is critical for construction applications where workers must remain aware of their physical surroundings.
Hardware and software components of the SDSU system
The mixed reality headset used in the SDSU trial projects a miniature three-dimensional model of the building directly into the wearer’s field of view. The user can virtually walk through the model, viewing the structure from the front, back, and sides, and examining the spatial relationships between different building systems.
The electrical conduit layout is extracted from a full building information model containing all piping, ductwork, and structural elements of the Avera Health building under study. This model is adapted to the mixed reality headset software, allowing the electrical contractor to view the conduit routing projected against the actual construction site.
The Electrical Conduit Installation Challenge in Commercial Buildings
Electrical conduits protect wiring runs throughout commercial buildings, but they must share limited overhead space with mechanical ducts, plumbing lines, fire suppression piping, and structural elements. This congestion creates persistent coordination problems that can delay projects and increase costs.
Common coordination conflicts in ceiling plenums
- Sequencing disputes: The contractor who arrives on site first claims the most accessible space, leaving later trades to work around already-installed systems. This first-come-first-served approach rarely produces the most efficient layout.
- Limited visibility: Conduits are typically installed in tight spaces above ceilings where visibility is restricted. Workers often cannot see the full path a conduit run must follow until they are actively installing it.
- Design clashes: Two-dimensional drawings may not reveal conflicts between conduit runs and other building systems until installation is underway, requiring expensive field modifications.
- Rework costs: When conduits must be relocated due to undetected conflicts, the electrical contractor absorbs the cost of removing and reinstalling materials, often on an accelerated schedule.
How traditional methods fall short
Conventional approaches to conduit coordination typically rely on bringing a computer or tablet to the jobsite and comparing screen-based models with the physical space. This method requires the contractor to mentally translate between the two-dimensional screen representation and the three-dimensional environment, a cognitive step that introduces error and slows decision-making.
Building information modeling has improved preconstruction coordination, but the gap between the digital model and the physical installation remains. Even with intelligent building technology transforming commercial construction operations, translating model data into real-world installation guidance still depends heavily on individual worker judgment and experience.
SDSU Research Methodology and Real-World Testing
The SDSU study partners with an electrical contractor working on the Avera Health building in South Dakota to test the mixed reality headset under actual site conditions. The research is funded through the Thomas Glavinich ELECTRI International Early Career Award, which supports innovative approaches to electrical construction.
Research objectives
- Evaluate the accuracy of mixed reality-guided conduit placement compared to traditional methods
- Measure time savings during the layout and installation phases
- Assess the learning curve for contractors using mixed reality headsets on site
- Document error rates in conduit positioning with and without mixed reality guidance
- Identify practical barriers to deploying mixed reality technology on active construction sites
Data collection approach
Huang and his team are collecting quantitative data on how the device performs in an actual construction environment. This includes measuring the precision of conduit placement, the time required for layout tasks, and the frequency of coordination conflicts encountered during installation.
| Metric | Traditional Method | Mixed Reality Method | Expected Improvement |
|---|---|---|---|
| Layout time per conduit run | Baseline | Projected reduction | 25 to 40 percent |
| Coordination conflict detection | During installation | Before installation begins | Significant reduction in rework |
| Worker spatial understanding | Mental translation from 2D drawings | Direct 3D overlay on physical space | Reduced cognitive load |
| Data transfer from BIM to field | Tablet or printed drawings | Wearable hands-free display | Faster access to model data |
Real-world conditions tested
The Avera Health building provides a realistic test environment with multiple building systems competing for overhead space. The electrical contractor faces the same constraints that occur on any commercial project: limited access, varying ceiling heights, and the need to coordinate with mechanical and plumbing trades working simultaneously in the same zones. These conditions make the study results directly applicable to typical commercial construction projects.
Implications for MEP Coordination and Future Construction Practices
The SDSU mixed reality research points toward a future where digital models are not simply design tools but active guides during installation. If the trial demonstrates measurable improvements in accuracy and efficiency, the technology could change how electrical contractors approach conduit layout on commercial projects.
Potential benefits for electrical contractors
- Reduced rework: Detecting conflicts before installation eliminates the cost of removing and reinstalling misplaced conduit runs.
- Faster installations: Direct visualization of the intended conduit path reduces time spent measuring, marking, and verifying layout.
- Improved coordination: Multiple trades viewing the same digital overlay can identify and resolve clashes before they become field problems.
- Better documentation: As-installed locations can be captured directly from the mixed reality system and fed back into the building model.
Applications beyond electrical conduits
The same mixed reality approach that helps electrical contractors position conduits can be adapted to other MEP systems. Mechanical contractors could use the technology to verify duct routing, plumbers could check pipe penetrations against structural elements, and fire protection contractors could confirm sprinkler head locations against ceiling layouts.
Electrical safety remains a priority in any commercial installation, and technologies like shielded switchgear for electrical safety in modern building infrastructure complement the visualization improvements that mixed reality offers. Together, these innovations address both the physical and informational dimensions of electrical construction quality.
Barriers to widespread adoption
- Hardware durability: Construction environments expose headsets to dust, impact, and temperature extremes that consumer-grade devices are not designed to withstand.
- Battery life: Full-day site use requires headsets that can operate for eight to ten hours without recharging.
- Model integration: The workflow for transferring BIM data to mixed reality software must be streamlined to avoid adding administrative burden.
- Training requirements: Contractors and workers need time to become proficient with the technology before productivity gains materialize.
- Cost: The initial investment in headsets and software must be justified by measurable savings in rework and installation time.
The integration of electrical infrastructure systems like EV charging in commercial buildings demonstrates how the electrical trade continues to expand in scope and complexity. Mixed reality tools that help contractors manage this complexity will become increasingly valuable as building systems grow more integrated.
The SDSU research represents a practical step toward closing the gap between digital design and physical construction. By testing mixed reality headsets under real site conditions with actual electrical contractors, the study provides evidence that will help the industry evaluate whether this technology delivers on its promise of fewer conflicts, less rework, and more efficient installations.