(Bloomberg) -- New Jersey Governor Phil Murphy declared a state of emergency effective Friday over a potential propane shortage for home and commercial heating after a service disruption at a major plant in Pennsylvania.Some 186,000 New Jersey residents rely on propane for heating, the governor’s office said in a statement, and the emergency order comes as temperatures continue to fall well below freezing in the region. Crucially, it waives hours-of-service regulations for trucking heating fuels.The potenti ...