TLGO

Twist Lock Ground Out. Old term for non-NEMA 120V connector. The bend on the ground blade turns out and is more of a nub. This connector is nearly obsolete.

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http://mail.altmanltg.com/publicsyn...d=1&Country=US&Show=0&Account=&Assortment=260

From http://www.lightfool.com/features/connectors/index.html :
Non-NEMA "Nub-Out Twist" 20A 125/250V 3-Pole 3-Wire "Special Application Only"
Apparently, institutional performance spaces qualify as "special purpose applications" because this was the locking connector of choice for schools until about 1981, when the specs for UL listing changed. It's no longer a UL rated connector, so it shouldn't be used in new projects, but it's ok for replacement in older systems. It's generally been replaced by the L5-20, which is commonly known as the "Nub-In Twist".

For discussion, see http://www.controlbooth.com/forums/lighting/13438-old-non-nema-pin-out-style-twistlocks.html.

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