Hotstick USA licenses ORNL direct-current detector for emergency responder safety

Credit: Carlos Jones/Oak Ridge National Laboratory, US Dept. of Energy

OAK RIDGE, Tenn., May 21, 2018 – North Carolina-based Hotstick USA has exclusively licensed a direct-current detector technology developed by the Department of Energy's Oak Ridge National Laboratory to help emergency responders safely detect high voltages.

In emergency situations, first response teams often rely on voltage detectors such as Hotstick USA's flagship product, the AC Hotstick, to sense the presence of dangerously high alternating current, or AC, electric voltages from a safe distance. The increase in electric vehicles on the road and solar panels on homes means high voltages could also originate from direct current, or DC, sources not accurately detected by existing technologies.

ORNL inventors Bruce Warmack and Nance Ericson, who specialize in experimental physics and sensing technologies, worked with Hotstick USA to develop a DC-detection prototype.

"Emergency responders need to assess their safety before commencing rescue efforts," said William Beckmann, president of Hotstick USA. "The DC hotstick detector will help them more accurately determine whether an electric vehicle or home is energized from a direct-current source for better, safer emergency assessments."

"This new tool protects them as they're protecting others and saving lives," he added.

The DC hotstick prototype is a handheld device equipped with easy-to-read indicator lights that show whether the probe has established a connection and whether the electricity source is hot. In a crash involving an electric vehicle, for instance, the car's battery could still be connected and energized at a deadly 400 to 600 volts.

The probe is designed with a novel piercing tool to cut through plastic cable insulation that may obstruct contact with the vehicle's battery and to indicate that a valid electrical connection is made. "This ensures good contact for an accurate voltage reading in a situation where decisions must be made in seconds," Warmack said.

Early results from field testing of the patent-pending technology have yielded a positive response, according to Warmack. He and his team plan to expand the functionality of the hotstick including collecting, sharing and storing voltage data.

After further development, Beckmann expects the DC hotstick to complement the company's existing AC sensing technology, which is the market leading device, and satisfy the need expressed by many customers.

"Our partnership with Hotstick USA exemplifies how our nation's critically needed capabilities can be conceptualized, incubated and prototyped at the lab and then transitioned to industry for commercialization," said Richard Raines, director of ORNL's Electrical and Electronics Systems Research Division. "This effort demonstrates the successes possible through strong, collaborative laboratory-industry partnerships."

Inventors of this technology include ORNL's Warmack, Ericson, Yarom Polsky and Roger Kisner.

The direct current voltage probe was designed under the sponsorship of the U.S. Fire Administration, a division of the U.S. Department of Homeland Security.


UT-Battelle manages ORNL for DOE's Office of Science. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit

Image 1:

Caption 1: ORNL inventors Bruce Warmack, left, and Nance Ericson display an early prototype of the DC hotstick. Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy.

Image 2:

Caption 2: Nance Ericson, left, and Bruce Warmack of ORNL test the DC hotstick on a hybrid electric vehicle. Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy.

Image 3:

Caption 3: The DC hotstick voltage probe can accurately detect the presence of DC voltages in a hybrid electric vehicle. Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy.

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Sara Shoemaker

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