Electrical systems are the backbone of modern commercial, industrial, and institutional facilities. From lighting and HVAC equipment to production machinery, data systems, elevators, medical devices, and emergency power, nearly every critical operation depends on reliable electricity. When an electrical fault occurs, the way the system responds can determine whether the issue remains isolated—or turns into a costly facility-wide outage.
This is where Coordination Studies become essential.
A coordination study evaluates how protective devices such as circuit breakers, fuses, relays, and switchgear respond during fault conditions. The goal is simple but critical: when a fault happens, only the device closest to the problem should trip, while the rest of the electrical system continues operating safely. Without proper coordination, a minor fault can shut down major portions of a building, damage equipment, interrupt operations, and create serious safety risks.
At Hariton Engineering, electrical system reliability is a core part of responsible engineering design. Through detailed power system analysis and practical recommendations, coordination studies help facilities prevent unnecessary downtime, reduce equipment damage, and improve long-term operational performance.
What Is a Coordination Study?
A coordination study, also called a protective device coordination study, is an engineering analysis used to determine whether electrical protective devices are properly sequenced. These devices are designed to detect abnormal electrical conditions and disconnect power before damage occurs.
Protective devices may include:
- Circuit breakers
- Fuses
- Protective relays
- Motor protection devices
- Ground fault protection systems
- Switchgear and panelboard protection
During a coordination study, engineers analyze how these devices respond at different current levels. The study uses time-current curves to compare device operating times and determine whether they are properly coordinated.
In a well-coordinated system, the device closest to the fault operates first. Upstream devices remain energized unless the downstream device fails to clear the fault. This approach limits the affected area and keeps the rest of the facility running.
Why Coordination Studies Matter
Electrical faults can happen for many reasons, including equipment failure, insulation breakdown, loose connections, moisture intrusion, overloaded circuits, or accidental damage. When faults occur, current can rise rapidly and cause severe stress on electrical components.
Without proper protective coordination, facilities may experience:
- Widespread power outages
- Equipment overheating
- Transformer and switchgear damage
- Production shutdowns
- Nuisance breaker trips
- Increased maintenance costs
- Safety hazards for personnel
Coordination studies reduce these risks by ensuring the system reacts correctly when abnormal conditions occur.
Preventing Equipment Damage
One of the most important benefits of coordination studies is equipment protection. Electrical equipment is designed to tolerate certain levels of current for specific periods of time. When fault currents exceed safe limits or continue too long, equipment damage can occur.
A coordination study helps protect:
Transformers
Transformers are expensive and critical components in most electrical distribution systems. Fault currents can overheat windings, damage insulation, and shorten transformer life. Proper protection ensures faults are cleared before thermal damage occurs.
Switchgear and Panelboards
Switchgear and panelboards distribute power throughout a facility. If protective devices do not operate correctly, fault energy can damage bus bars, breakers, and internal components.
Motors and Drives
Motors and variable frequency drives are vulnerable to fault conditions and voltage disturbances. Coordinated protection helps prevent unnecessary damage and downtime.
Conductors and Cables
Excessive current can overheat conductors, damage insulation, and create fire hazards. Proper coordination limits exposure time and helps preserve system integrity.
By ensuring protective devices operate within safe timeframes, coordination studies help extend equipment lifespan and reduce replacement costs.
Reducing Downtime Through Selective Coordination
Downtime is one of the most expensive consequences of poor electrical coordination. In many facilities, even a short outage can interrupt operations, delay production, affect customers, and create financial losses.
Selective coordination ensures that only the affected circuit is disconnected during a fault. For example, if a fault occurs in a small branch circuit, the local breaker should trip—not the main breaker serving an entire floor or facility.
Without selective coordination, a minor issue can cause:
- Complete production line shutdown
- Loss of lighting or HVAC service
- Server or data system interruptions
- Elevator or life safety system disruptions
- Delays in business operations
Coordination studies prevent these unnecessary outages by verifying that protective devices are properly sequenced.
Improving System Reliability
Electrical reliability is not only about having enough power capacity. It also depends on how well the system responds to faults and disturbances.
Coordination studies improve reliability by:
- Identifying improperly sized protective devices
- Revealing overlapping trip curves
- Detecting potential nuisance trip conditions
- Recommending optimized breaker or relay settings
- Supporting better maintenance planning
A reliable system isolates problems quickly and keeps unaffected areas operating. This is especially important in facilities such as hospitals, laboratories, manufacturing plants, data centers, schools, and commercial buildings.
Supporting Safety and Compliance
Electrical faults are not only operational risks—they are safety risks. Improperly coordinated systems can increase the likelihood of arc flash events, equipment failures, and hazardous working conditions.
Coordination studies often support broader electrical safety efforts, including:
- Arc flash studies
- Short circuit studies
- Preventive maintenance programs
- Code compliance reviews
- Electrical system upgrades
By understanding how protective devices behave, engineers can help reduce hazard exposure and improve workplace safety.
The Connection Between Short Circuit Studies and Coordination Studies
Coordination studies are often performed alongside short circuit studies. While they are related, they serve different purposes.
A short circuit study determines how much fault current is available at different points in the electrical system. A coordination study determines how protective devices respond to that fault current.
Together, these studies help engineers answer two essential questions:
- Can the equipment safely withstand or interrupt available fault current?
- Will the correct protective device trip at the correct time?
Both studies are important for safe and reliable electrical system design.
When Should Coordination Studies Be Performed?
Coordination studies are valuable during many stages of a facility’s lifecycle.
They should be performed:
During New Construction
New electrical systems should be analyzed before they are energized to ensure protective devices are properly selected and set.
During Major Renovations
Renovations often add new loads, circuits, panels, or equipment. These changes can alter system behavior and require updated coordination.
After Equipment Upgrades
Replacing transformers, switchgear, breakers, or relays may affect fault levels and trip settings.
When Expanding a Facility
Adding new building areas or production equipment can increase electrical demand and require system re-evaluation.
After Utility Service Changes
Utility upgrades can change available fault current, which may impact coordination and equipment ratings.
During Preventive Maintenance Reviews
Periodic review helps ensure electrical systems remain reliable as equipment ages and facility needs evolve.
Common Problems Found During Coordination Studies
A professional coordination study may uncover several issues, including:
- Breakers that trip too slowly
- Upstream breakers that trip before downstream breakers
- Fuses that do not coordinate with breakers
- Relay settings that expose equipment to unnecessary risk
- Protective devices with overlapping time-current curves
- Equipment that may not be adequately protected
Identifying these problems before a fault occurs allows facility owners to make corrections proactively.
Recommendations That May Result from a Coordination Study
After completing the analysis, engineers may recommend adjustments or upgrades such as:
- Changing breaker trip settings
- Replacing fuses with more appropriate ratings
- Adjusting relay pickup and delay settings
- Upgrading protective devices
- Improving system labeling and documentation
- Modifying equipment configuration
These recommendations are designed to improve protection, reduce downtime, and enhance system reliability.
Long-Term Cost Savings
Coordination studies are an investment in prevention. While the analysis requires upfront cost, the long-term savings can be significant.
A properly coordinated system helps reduce:
- Emergency repair costs
- Equipment replacement expenses
- Production losses
- Maintenance disruptions
- Insurance and liability exposure
- Unplanned outages
For many facilities, preventing even one major electrical outage can justify the cost of the study.
Why Choose Hariton Engineering?
Hariton Engineering provides professional engineering solutions focused on reliability, safety, and long-term building performance. With expertise in electrical systems, MEP design, power system analysis, and facility coordination, the firm helps clients identify risks before they become expensive failures.
Hariton Engineering supports clients with:
- Coordination studies
- Short circuit analysis
- Arc flash support
- Electrical system design
- MEP engineering services
- Code-compliant engineering solutions
- Practical recommendations for facility reliability
By combining technical expertise with real-world project experience, Hariton Engineering helps facilities protect equipment, reduce downtime, and improve electrical system performance.
Conclusion
Electrical faults cannot always be prevented, but their impact can be controlled. Coordination Studies ensure that protective devices respond in the correct order, isolating problems quickly and preventing unnecessary system-wide outages.
By reducing equipment damage, improving reliability, supporting safety, and minimizing downtime, coordination studies play a vital role in modern electrical system management. For commercial, industrial, and institutional facilities, this type of analysis is not just a technical requirement—it is a smart strategy for protecting operations and long-term investment.
Facilities that prioritize proper coordination are better prepared for unexpected electrical events and better positioned for efficient, safe, and reliable performance.
