A professional job typically signifies that someone is in the highest-level position in his profession, or has the potential for upward mobility with experience. A non-professional job usually means that you perform front-line or lowest-level duties in an industry or company. Laborer jobs and front-line sales and service jobs in retail are listed as examples of non-professional jobs on the University of Illinois website.
The J1772 plug was specifically designed for electric car charging. Problem is, given a typical electric car like the Nissan Leaf, it can take 15 hours to charge the battery from empty to its EPA-rated 75-mile range from that standard household source. Most plug-in cars have a J1772 port, letting them plug into public charging stations.
Assuming a typical lead-acid, 12 V car battery (typically at 13 V or so fully charged), and that it takes roughly 500 A over 3 seconds to start an engine, how long will it take to recharge the battery at any given charge rate? Over 3 seconds that's 19,200 joules.