A business can reopen after a storm and look fine from the parking lot.
The sign is lit. Air conditioning is running. Registers boot up.
Then somebody presses the test button on an emergency light and nothing happens.
Phoenix Fire has been telling business owners to pay attention to exactly this kind of problem after monsoon weather. Its Fire Prevention guidance for business owners currently includes a post-monsoon notice asking businesses to make sure life-safety systems haven’t been damaged.
That check belongs somewhere between cleaning debris from the entrance and calling the building “back to normal.”
A building can have power and still have an electrical problem
Commercial properties split electrical loads across many circuits and pieces of equipment.
That makes partial failures easy to miss.
The front office may be completely normal while an exterior circuit is dead. Refrigeration might be operating while a piece of kitchen equipment refuses to restart. Half the warehouse lights can work while another circuit keeps tripping.
A manager walking through the building after utility service returns should pay attention to what changed.
Breaker positions are one clue.
New buzzing, burning odors, warm electrical equipment, lights that flicker together or devices that won’t restart are others.
A storm doesn’t need to cause a complete blackout to leave electrical damage behind.
Emergency lighting needs to work with the normal lights off
Looking at an emergency fixture while the building has ordinary power doesn’t tell you much.
Its job begins when that power disappears.
Battery-backed emergency lights and illuminated exit signs need to operate during the condition they’re meant for. A storm outage can expose an aging battery that seemed fine the week before.
The same principle applies to other backup equipment.
If a system depends on stored battery power during an outage, a real outage may be the first hard test it has had in months.
Finding the dead battery after everyone has returned to work beats finding it during the next loss of power.
Water can create a delayed electrical failure
Wind gets attention during Phoenix monsoons, but water can leave a quieter mess behind.
A roof leak above a ceiling can reach wiring. Exterior boxes can take wind-driven rain. Water can enter around damaged building components and remain after the floor looks dry.
That’s one reason a post-storm electrical issue may appear the next day rather than the moment the thunderstorm passes.
Don’t energize obviously wet equipment just to see whether it still works.
If water reached a panel, disconnect, control cabinet or other electrical equipment, the condition of that equipment needs to be dealt with before normal operation resumes.
Dry on the outside doesn’t tell you what happened inside an enclosure.
Restaurants have their own headaches
A restaurant can have dozens of electrical loads operating at once.
Walk-in refrigeration, reach-ins, exhaust equipment, lighting, countertop appliances and cooking equipment may all be coming back online after the same outage.
If one breaker starts opening repeatedly after restoration, the kitchen manager shouldn’t have to spend the dinner shift resetting it between orders.
There’s a fault somewhere.
The same applies when a refrigerator or freezer repeatedly loses power. Beyond the electrical issue, it becomes a food-storage problem as temperatures rise.
Fixing the cause early is cheaper than discovering it through spoiled inventory.
Timing matters more for some businesses than others. A restaurant with refrigeration down, a medical office with a critical circuit offline or another property that depends on electrical equipment may not be able to leave the problem until the next business day. In those situations, 24/7 electricians give property managers an option when the electrical failure can’t reasonably wait until morning.
Warehouses and offices hide failures differently
A warehouse may have high-bay lighting, powered doors, equipment chargers and electrical loads scattered across a much larger building.
An office might have fewer large loads but far more small ones.
Computers restarting normally doesn’t prove an entire commercial electrical system is fine.
Check the less obvious areas: exterior lighting, storage spaces, dedicated equipment circuits, common areas, mechanical rooms and anything that normally operates automatically.
Security and access-control equipment deserve attention too if they were affected by the outage.
Phoenix has a lot of life-safety equipment behind ordinary doors
The Phoenix Fire Department says its inspection system tracks roughly 90,000 fire and life-safety systems requiring annual third-party inspections.
Most people walking into a store never think about those systems.
That’s exactly why they can be overlooked during storm cleanup.
The broken tree in the parking lot gets noticed first. So does the damaged awning.
A backup light with a dead battery doesn’t.
Before the “open” sign goes back on, somebody should check the equipment that’s supposed to work when the normal lights go out.
