My old school's theatre is donating their 12 old 4-circuit 12-lamp Strand/Century R40 borderlights to my high school, and they have twistlocks on them. Our electrics are all U-ground (Edison) connectors. The borderlights are set up to "daisy chain," basically meaning that one end has male plugs to plug into the electric or another instrument, and the other end has female plugs so more borderlights can be chained together (up to 2400w per circuit). Anyway, I want to use adapters since we'll be chaining four together on each electric, and we really don't have the money right now to buy 96 plugs at about $5 each. I would get 12 adapters that would go from U-ground male to twistlock female for each of the four circuits on the three electrics. In a theatrical supply catalog, I found adapters that were made from ST cable, and was wondering if that is legal for stage use. They look to be about a foot long from the picture they have in there. I know the three foot rule for any SJxxx cable, but I don't have a copy of the NEC (and I really wouldn't want to go digging even if I had it, that would give me a headache!), and I don't know if that applies for ST cable or not. They also have adapters made of SO cable, but they're considerably more expensive. Here's the catalog: http://www.norcostco.com/eProducts/2006catalog.pdf They're on PDF page 39 (catalog page 36) near the bottom right corner. The PDF takes forever since it's pretty big, but be patient and it will eventually show up.