Dog leg
Dog leg turns up in 2 fields: electricians, shop slang. Here is what it means to the people in each one.
Dog leg in electricians
Crooked bend where two bends in one conduit end up out of plane, so the run will not lie flat.
A dog leg is the error that happens when the second bend of an offset, saddle or back-to-back is rotated relative to the first, so the conduit twists out of plane and will not sit flat on a wall or floor. It comes from the pipe rolling in the bender between bends. Small ones can sometimes be stomped or twisted out; bad ones go in the scrap pile, and they are the first thing a foreman spots on a finished run.
"That offset has a dog leg, lay it on the floor and stomp on it, or cut it off and bend a new one."
Dog leg in shop slang
A sharp, crooked bend in a pipe, cable run, or access route.
This describes any physical layout or component that features a sharp, angular bend resembling the hind leg of a dog. Tradespeople use the term for offset bends in conduit, crooked access roads on a site, or misaligned structural joints. It usually implies an awkward deviation from a straight path that requires extra fittings or careful maneuvering to navigate.
"You'll need to pull that cable through the dog leg in the ceiling void, so use plenty of lube."