Why Expert Oversight Matters in Arc Flash Compliance
- Jeff Kershner
- 2 days ago
- 3 min read
NEC 2026 Section 110.16 update series
As companies rush to meet the expanded labeling requirements in NEC 2026 Section 110.16, many electrical contractors ask this question:
“Do you handle arc flash calculations in-house, or bring in an expert?”
We've heard it time and again: "do we really need an arc flash analysis in (x) scenario?", and this question gives us pause. Many do not realize that “figuring it out” using software or online tools is far from easy. And when it comes to arc flash compliance, there is no room for guesswork.
Arc flash analysis is an engineering process that combines physics, protective device coordination, and regulatory knowledge. When it’s done without expert oversight, the risks go far beyond failed inspections.
What Can Go Wrong Without Expert Oversight
Even small errors in arc flash calculations can lead to major consequences.
Here’s what happens when shortcuts replace sound engineering:
Underestimating incident energy: Workers may choose PPE that can’t withstand a real fault, resulting in serious injury or death.
Overestimating hazards: Facilities may impose excessive PPE requirements or lockout procedures that disrupt operations and increase costs unnecessarily.
Missing variables: Only experienced engineers know how to interpret complex system data — like transformer impedance or clearing time — that dramatically affect results.
Invalid reports: A generic software output without verified inputs or engineering review doesn’t satisfy NFPA 70EⓇ or OSHA expectations.
Without expert review, labels might look legitimate — but that doesn't make them defensible, safe, or compliant.
The Value of Expert Oversight
A qualified electrical engineer brings more than just a state’s professional license; they bring a methodical process that ensures every number on your label can be trusted.
Professional oversight includes:
Validation of input data: verifying system drawings, breaker settings, and utility fault levels.
Software model accuracy: confirming that the study reflects real-world system configurations.
Assumption logs and justification: documenting conservative estimates where data is uncertain.
Protective device coordination review: ensuring breaker settings are correct.
Comprehensive reporting: providing auditable proof of due diligence and code compliance.
This level of documentation protects both contractors and their clients in the event of an incident or OSHA inquiry.
The Role of the Professional Engineer (PE)
While NFPA 70EⓇ and IEEE 1584 don’t explicitly require a PE stamp, most states classify arc flash studies as engineering services, meaning they must be performed or approved by a licensed Professional Engineer.
Why? Because these studies involve applying engineering judgment to protect public safety.
State engineering boards expect licensed professionals to:
Demonstrate technical competence.
Accept legal accountability for the work.
Uphold ethical and safety standards that safeguard workers.
In many states, performing an arc flash study without PE oversight can result in the invalidation of a report, disciplinary action, fines, charging of a misdemeanor and in some states a felony.
In short: If a PE didn’t review or sign the report, the work likely doesn’t meet state engineering requirements.
Why This Matters for Contractors
For electrical contractors, partnering with qualified engineers does more than satisfy regulations; it protects your business reputation.
Here’s what expert oversight means for you:
Credibility: Clients trust contractors who can document compliance with NEC, NFPA, and state laws.
Reduced liability: A PE-stamped report provides a defensible record if an accident occurs.
Fewer callbacks: Accurate studies minimize rework and label replacement.
Safer outcomes: Workers can perform maintenance confidently with accurate, verified information.
Contractors who invest in doing it right the first time stand apart from competitors, and build long-term client trust.
Compliance Is a Team Effort
Arc flash safety isn’t achieved by a single sticker, software tool, or contractor. It’s the result of collaboration between field experience and engineering precision.
When electrical professionals, engineers, and safety managers work together, they ensure that every label tells the truth — not just what looks good on paper.
Conclusion: Expertise Is Non-Negotiable
Arc flash labeling under NEC 2026 Section 110.16 demands technical accuracy and accountability. Anyone can apply a sticker, but only qualified experts can ensure it’s correct.
Before you take responsibility for labeling, ask yourself:
“Would I trust this data to protect my team — and my reputation — in front of an inspector?”
If the answer is uncertain, it's safer to consult with a licensed professional.
Partner With Experts Who Understand the Full Picture
Guidant Power provides engineer-led arc flash studies that comply with NFPA 70EⓇ, IEEE 1584, and NEC 2026 Section 110.16. Every report is reviewed by a Professional Engineer and backed by complete documentation, ensuring your labels are both compliant and trustworthy.
70E®, Standard for Electrical Safety in the Workplace®, NFPA 70®, NEC®, and National Electrical Code® are registered trademarks of the National Fire Protection Association, Quincy, MA. All rights reserved. This informational material is not affiliated with nor has it been reviewed or approved by the NFPA.
