Incident Prevention Magazine

Edward Morson and Mark Green

Innovative Fire Suppression Solutions for System and Worker Safety

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For over 100 years, PECO – a Pennsylvania utility and member of the Exelon utility family – has been supplying electricity and natural gas to customers across southeastern Pennsylvania, including those in Philadelphia and its surrounding suburbs. PECO has hundreds of miles of utility poles and thousands of circuit miles of medium-voltage distribution cables installed in conduit and manhole systems.

With all this infrastructure, it is only natural that wear and tear will occur, which can have an impact on the distribution system. Over the decades, PECO has experienced numerous failures of distribution system components, some of which developed into fires that were difficult to combat due to poor weather conditions. Unfortunately, local volunteer fire departments typically are not equipped to deal with these types of fires, and even city fire departments, whose workers receive training on electrical fires, sometimes have a difficult time extinguishing them.

Regulations and Extinguishing Agents
Another issue PECO employees have had to deal with is the type of fire extinguishers available in their work vehicles. For utilities that have service fleets and operate under federal guidelines, the U.S. Department of Transportation requires those fleet vehicles to carry fire extinguishers. Per Federal Motor Carrier Safety Regulation 393.95, “Emergency equipment on all power units,” each extinguisher must have a gauge to indicate if the extinguisher is fully charged and a label that displays its UL rating. Extinguishers also must be securely mounted and readily available and accessible for use at all times. In addition, a vehicle transporting hazardous materials must be equipped with an extinguisher with a UL rating of 10 B:C or more. If the vehicle is not transporting hazardous materials, it must carry one extinguisher with a rating of at least 5 B:C, or two extinguishers, each with a rating of 4 B:C or more.

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