When to Renew Power Study and Why It Matters for Safety, Reliability, and Compliance

Most facilities run for years without giving their power system studies a second thought  and if things are running smoothly, it's natural to assume the old study still holds up. But a power system study doesn't guarantee safety by itself; what it actually does is verify that your system's design still checks out, and flag the risks before they turn into real problems.

The catch is, systems rarely stay frozen in time. Equipment gets swapped, loads shift, protection schemes get modified, and safety standards evolve  and any one of these can quietly make an older study inaccurate without anyone noticing. This article walks through when it's time to update your study, where NFPA 70E fits into the picture, the questions clients ask most often, and how Allumiax helps organizations keep their electrical infrastructure safe and compliant.

Significance of a Power System Study:

Power system studies should not be treated as one-time deliverables. They are living engineering documents that must accurately reflect the current/updated condition of an electrical system. As facilities expand and operational requirements evolve, the assumptions used in earlier studies can quickly become outdated.

Updating these studies is not simply a technical requirement it is a critical safety and operational responsibility. Even when a system appears to be functioning normally, underlying risks may still exist.

Why Power System Studies Must Be Renewed Every Five Years

No facility stays exactly the same for long. Loads increase, equipment gets upgraded, protective devices get swapped or reconfigured  and over time, these changes usually add up in ways that quietly move a facility away from what the original study assumed. A study that was spot-on a few years ago can slowly fall out of sync with reality, leading to incorrect fault calculations, poor coordination, unsafe arc flash exposure, or compliance gaps you didn't know you had. And the tricky part is, the system can still look and feel like it's working fine on the surface. That's why renewing the study every five years isn't just a checkbox exercise it's a practical step toward keeping people, equipment, and operations protected.

Common Triggers That Necessitate a New Study

Common triggers that necessitate a new power system study are typically tied to any change that affects how the electrical system operates or how protection devices respond. These include the addition or replacement of major equipment such as transformers, generators, or large motors, significant load growth, modifications to protective device settings, or changes in the utility supply. Facility expansions, process upgrades, and even seemingly minor adjustments in system configuration can alter fault levels and coordination. In addition, outdated one-line diagrams, missing or inaccurate arc flash labels, and updates in safety standards like NFPA 70E are strong indicators that a study is no longer valid. Recognizing these triggers in early stage ensures that the system remains accurately modeled, properly protected, and aligned with both safety and compliance requirements.

Activities That Require Updating/Performing a Power System Study

It is a logical and safe approach to labeling all the equipment to avoid hazardous conditions and injuries. An example of an arc flash Warning Label is shown below:

"My System Is Working Fine" A Costly Assumption in Business

If your system is running and nothing's tripped yet, it's easy to assume everything's fine. But steady-state operation only tells you the system is working right now not that it's safe, efficient, or ready for what's coming. Underneath a "normal-looking" system, things like outdated protection settings, incorrect fault levels, poor coordination, or unsafe arc flash exposure can quietly build up for years. And when they finally surface, the damage is almost always bigger and more expensive than the cost of a timely study would have been. That's the real value of proactive power system studies: they won't fix anything on their own, but they'll show you exactly where the risks are so you can act before something forces you to.

Possible Consequences of Not Renewing the Study

Not renewing a power system study can create serious risks that affect both technical performance and business operations. From an engineering point of view, outdated studies mean the system is no longer accurately modeled, which can lead to incorrect fault levels, improper protective device coordination, and unreliable arc flash calculations. This increases the chances of equipment not clearing faults correctly during abnormal conditions. From a client perspective, these technical gaps directly translate into real-world problems such as unexpected shutdowns, equipment damage, higher maintenance costs, and potential safety incidents. It can also result in non-compliance with safety standards like NFPA 70E, exposing the organization to legal and operational risks. In simple terms, a system may appear to be working fine, but without updated studies, both safety and reliability are no longer fully guaranteed.

What It Costs vs. What It Saves

Let’s look at this with clear eyes. A comprehensive power system study is a fraction of the cost of a single incident:

Numbers That Put “Nothing Has Happened Yet” in Perspective 

OSHA’s General Duty Clause (Section 5(a)(1)) requires employers to provide a workplace free from recognized hazards.

If your facility hasn't conducted or updated an arc flash hazard analysis, that's not a gray area it's an unaddressed hazard putting your team and equipment at risk.

Beyond OSHA fines: The civil liability exposure from a serious electrical incident particularly if investigation reveals studies were outdated or never performed can reach into the millions. Insurance carriers are increasingly scrutinizing electrical safety compliance. Facilities without current studies have seen claims denied and premiums significantly increased.

Compliance with NEC NFPA 70E Code Requirements 

Compliance with NEC and NFPA 70E code requirements is essential for maintaining both electrical reliability and worker safety. While the NEC ensures that electrical systems are installed properly, NFPA 70E provides the safety practices needed to protect employees from shock, electrocution, and arc flash hazards. Together, these standards help businesses reduce risk, avoid costly incidents, and maintain a safer, more compliant work environment.

What Are the Next Steps?

1. Facility Assessment & Code Compliance Review

The first step is to evaluate the existing or new electrical infrastructure and identify any gaps in current code compliance. This includes reviewing system documentation, operating conditions, and ensuring alignment with NEC and NFPA 70E requirements.

2. Power System Study Execution (Partial or Complete System)

Based on the assessment, a detailed power system study should be performed for either selected portions or the complete electrical network. This ensures accurate short-circuit levels, protection coordination, and arc flash analysis based on real system conditions.

3. Implementation of Safety Recommendations

The final step involves applying the study findings to mitigate identified electrical hazards. This includes updating protective device settings, improving coordination, and implementing arc flash safety recommendations to enhance overall system safety and reliability.

• Arc Flash Hazard Analysis. IEEE 1584-2018 methodology, accurate incident energy at every bus

• Short Circuit Study. Fault current calculations, equipment interrupting ratings verified

• Protective Device Coordination. Selective coordination confirmed, maximum system reliability

• Arc Flash Labeling. NFPA 70E compliant labels installed at every required location

• Load Flow & Motor Starting. Voltage profile analysis, capacity and stability confirmed