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When a massive blaze destroyed six blocks of boardwalk in Bank Park and adjoining Bank Heights in arctic New Jersey aftermost month, accusation was placed on an accident that had happened 11 months earlier: Superstorm Sandy.

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How could aftermost year’s storm atom a blaze that austere accomplished blocks of boardwalk and destroyed added than 50 businesses?

The acknowledgment lies in the airy accident that floods can wreak on electrical wiring, experts say.

Even pinhole-size accident to an electrical wire’s insulation can advance to the wire heating up over 200 degrees. This can atom a blaze that can bake bottomward homes, businesses, or, in this case, a admired boardwalk that had aloof gotten aback in business.

Using an electrical wire with damaged insulation beneath a boardwalk or in a home is “like active a car on baldheaded tires. It doesn’t beggarly the car is activity to fail, but it could,” said Dave Brender, civic affairs administrator of electrical applications for the Chestnut Development Association, a barter accumulation for the electrical industry. “You’re allurement for trouble.”

A archetypal electrical wire is fabricated up of two components: The aboriginal is the metal that carries the electricity, which is frequently nut but can additionally be nut anguish about an aluminum core. The additional is the insulation, which is usually fabricated out of polyvinyl chloride, additionally accepted as PVC.

PVC is a accepted insulator, but it’s not perfect, said John Destasio, a accouterment artisan in Bank Park.

“Because we charge base to be flexible, we charge accomplish it out of a adjustable material,” he said. But that agency it’s “vulnerable to breakdown through time, erosion, and heat.”

Windblown beach can cut tiny holes in the wiring’s insulation, Destasio said. That allows baptize to bleed in and appear in acquaintance with the metal of the wire’s core.

Freshwater abandoned can bite the metal (think about an old car acerbic in the rain), but abyssal balance acts as an enhancer and speeds up the action (as does baptize attenuated by gasoline from a abounding gas station, oil from a abounding car, or carrion from a access avenue main).

That bearings can actualize a alarming acknowledgment loop, Destasio said. Bane of the wire creates attrition to the electricity affective through it, which afresh generates added heat. Calefaction quickens bane on the wire, which added increases resistance, which generates alike added heat.

Eventually, the hot wire alcove a temperature at which it break bottomward added of the insulation. At that point, arcs of electricity can canyon through the air from one wire to another, like little ts of lightning.

“If that arc were hot enough, and [if it] comes into acquaintance with article flammable, you get fire,” said Destasio.

After a storm like Sandy, it can be adamantine to acquaint which affairs central structures were afflicted by water, and alike harder to acquaint if insulation suffered small-scale damage.

The aforementioned botheration emerged afterwards the above calamity in Colorado in September and in North Dakota in April.

Even if the lights still work, there could be wire accident that leads to fires months or alike years later, Brender said.

Technicians use ohmmeters to admeasurement how abundant attrition is in a wire, Destasio said. If they acquisition a abundant deal, it can advance a wire is compromised, but affairs with basal accident generally analysis out accomplished but can accept problems later.

Much of the base acclimated up and bottomward the East Coast is decades old and may not be up to accepted codes. Some storm-damaged base may accept had beat or abominable insulation to activate with.

Much of the wire acclimated on boardwalks or in bank structures was never advised to be abounding by seawater, because ample storm contest like Sandy accept been almost attenuate until recently.

The Bank blaze was a big, arresting example, but post-Sandy fires accept been affecting homes and businesses forth the Jersey Shore for months.

In March, the boondocks of Strathmere—which has a year-round citizenry of 158 bodies and is about 70 afar (113 kilometers) south of Bank Park—saw two fires aural 18 hours of anniversary other. One was in an appointment and the added was in a home; both were bent to be affiliated to Sandy’s calamity of centralized wiring.

The official account of the Bank blaze was the abortion of electrical base that ran beneath the boardwalk. Officials attributed it to both the age of the wiring, some of which anachronous aback to the 1970s, and to acknowledgment to abyssal during Superstorm Sandy.

The crisis doesn’t stop with boardwalk wiring, though. Anything with a motor that was abounding by saler—like a barn refrigerator that started alive afresh aback the ability came aback on—poses a risk, said Brender.

The safest affair to do is alter any base that ability accept been afflicted by floodwater.

“That ablaze ball ability light, but it’s like a active time bomb, and you don’t apperceive it,” Brender said.

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