We have an outdoor stage that occasionally floods. It is seldom used but the students decided they would like to use it more. With the flooding, the electric supply was sketchy at best. We decided a portable system was needed. We purchased a Lunchbox-- 5 20 amp outlets and a mogul 3 pin stage plug(bates plug) rated at 100 amp. We put a 100' of JSO cable and a waterproof connector at the power panel. So, we have 100 amp 100' extension cord, or so I assumed.... It turns out the electrician didn't understand we were running a 100amp single phase extension cord. He wired it up as 2 phase 208... 2 hots and a neutral... As a test, he plugged his work light into it and it worked fine.. I didn't think anything about it--he was an electrician. The band shows up, plugs in and BOOM there goes there amps.. I get my meter out and check things. It is immediately apparent what had happened. In 5 minutes I had the panel re-wired and we were up and running. No one was hurt, but NEVER assume a job is done right... check it out yourself!!