Most commercial electrical failures announce themselves long before they take a building down—in heat, in loose connections, in a breaker that no longer trips on time. A real PM program is how you catch them first.Pillars Electric · May 2026
Electrical systems fail quietly until they fail loudly. A connection that’s been loosening for two years under thermal cycling doesn’t warn the facility team—until the day it arcs, drops a feeder, and takes a production line or a leasing office offline. The entire premise of preventive maintenance is that the warning signs are measurable well before the failure, and that a planned shutdown to fix a problem you found costs a fraction of the unplanned one you didn’t. For commercial and industrial facilities, a disciplined preventive maintenance and testing program is among the highest-return spends in the building.
The two most common precursors to a serious electrical event are heat and torque. Loose connections increase resistance, resistance generates heat, heat accelerates degradation, and the cycle compounds. Most catastrophic gear failures trace back to a connection that was never properly torqued at install or that worked loose under load cycling and was never checked again. The good news is that both conditions are detectable with routine testing—you don’t have to wait for the failure to know the failure is coming.
Infrared thermography is the fastest way to find trouble across a lot of gear quickly. Scanning energized switchgear, panelboards, motor control centers, and distribution under normal load reveals hot spots—an overheating lug, an unbalanced phase, a failing breaker—that are invisible to the eye. A good thermal survey is performed under meaningful load (a scan of de-energized gear tells you little), with the findings ranked by severity so the facility team knows what to fix this week versus what to watch. It is non-intrusive, requires no shutdown, and routinely pays for itself the first time it catches a connection before it lets go.
Thermography tells you where heat is; torque checks tell you why. Verifying that bolted connections, lugs, and terminations are at the manufacturer’s specified torque is foundational maintenance—and it has to be done on de-energized, properly isolated gear by people who follow safe work practices. Re-torquing to spec, cleaning oxidized contact surfaces, and documenting the result closes the loop on the single most common failure mode in the building. It’s unglamorous work, and it prevents more outages than anything else on the list.
A protective device that doesn’t operate as designed is worse than no protection at all, because everyone assumes it’s working. Molded-case and especially low-voltage power breakers can drift out of tolerance, develop mechanical sluggishness, or fail to trip within their time-current curve. Primary-injection and secondary-injection testing confirm that breakers trip when and how they should. For larger services, exercising and testing main and tie breakers on a schedule ensures the gear that protects everything downstream will actually act in a fault. This is also where coordination studies and aging gear intersect—sometimes testing reveals that the right answer is a switchgear and distribution upgrade rather than another round of repairs.
Preventive maintenance used to be treated as optional—a nice-to-have line item that got cut in lean years. That framing has shifted. NFPA 70B, the standard for electrical equipment maintenance, was elevated from a recommended practice to a standard, which establishes electrical preventive maintenance as an expected, structured program rather than an ad hoc activity. It calls for maintenance intervals informed by equipment condition and criticality, qualified personnel, and—critically—documentation. Beyond the standard itself, a documented EPM program supports your electrical safety obligations under NFPA 70E, because well-maintained equipment is a prerequisite for the arc-flash and shock assumptions those programs rely on.
The scans and the torque wrench are only half the value. The other half is the record. A maintenance program that produces a baseline, trends readings over time, ranks findings, and tracks corrective actions turns maintenance from a cost into an asset-management tool. Trended data tells you which gear is aging fastest, justifies capital planning to ownership, and—if something ever does go wrong—demonstrates that the facility was maintained to standard. The buildings that stay off the emergency-call list are almost always the ones with a binder, digital or physical, that proves the work was done.
If your facility hasn’t had a baseline electrical assessment in the last few years, that’s the place to start—a scan and a connection survey will tell you very quickly whether you’re carrying hidden risk. We build PM programs scaled to the criticality of the facility, from a single annual survey to a full multi-site cadence. Reach out to Pillars Electric and we’ll put together a maintenance plan that keeps your power on and your gear documented.
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