What is an electrician’s number one enemy? Besides engineers and fellow electricians, an arc flash is certainly at the top of the list. Each year in the United States, arc flash events cause hundreds of fatalities and thousands of injuries. People who work with electrical equipment develop a healthy respect for this hazard. Those who don’t work directly with it often fear the subject itself, which is why arc flash studies remain poorly understood.
This article will help you understand what to look for when you hire an outside group to perform a study and how to evaluate the final product. Even with no electrical background, you can spot good practices, avoid common traps, and make sure you receive a deliverable that actually protects your people and your facility.
Do
Gather whatever documentation you can find.
Single-line drawings (“one-lines”) map out your electrical system and list key equipment details like breaker sizes and fuse types. They might be digital or they might live in a dusty binder on a shelf. Anything you can provide saves time, reduces the chance of errors, and lowers your project cost. Accuracy matters more than volume, so only hand over documents you believe still reflect the real system.
Clarify who will gather the electrical system data and how.
The firm should be on-site for at least part of the data collection, which typically includes breaker and fuse data, transformer nameplate data, and wire information. Relying entirely on facility staff to open equipment and capture everything introduces mistakes and shifts accountability. This data collection often requires qualified electrical personnel to gather. The people performing the study need to see your system firsthand. Also confirm who will install the arc flash labels and whether that person understands how labels are meant to be placed.
Request a full copy of the project files from the firm.
Some firms treat the model as proprietary and charge extra to hand it over after the project. That creates an unnecessary paywall and locks you into using them for future updates. The model represents your system, so you should own it. Make sure the deliverables include the complete project files.
Don’t
Choose a firm on price alone.
Arc flash studies take time to do well. A model built from unverified data will produce results that look fine on paper but fail in the field. Firms that promise a much lower cost or faster turnaround than everyone else may be planning to skip verification or rush the analysis. Interview the bidders. Ask them to describe their process from data gathering to recommendations. Higher fees often reflect deeper diligence, and you deserve to understand what you’re paying for.
Accept the report without a walk-through.
If you skip the closeout meeting, the study becomes an expensive binder that sits on a shelf. Review the model results with the firm. Make sure the equipment names match your facility naming standards. Understand where the highest-risk areas are and what actions the firm recommends. You do not need the math behind the study; you need to know how to use the results.
Let the model go stale.
The study is a snapshot in time. Any changes to your electrical system affect the accuracy of the model, which affects the accuracy of labels and PPE recommendations. If you wait too long between updates, the firm will need to redo large sections of the work and your costs will jump. Small periodic updates keep the model trustworthy and affordable.
Arc flash studies are essential to keeping employees and contractors safe. A good study quantifies the hazard in your facility, identifies practical ways to reduce risk, and strengthens awareness of the dangers that exist in live electrical equipment. You do not need to be an electrical expert to manage the process. You only need a firm willing to explain their work and a clear sense of what a complete, accurate study should look like.
Author: Zachary Jenkins, P.E. – Electrical Engineer
