General
greenfield
What does greenfield mean?
Flexible metal conduit (FMC) — empty spiralled aluminium or steel tubing you fish wires through, used where rigid pipe can't go: short drops to motors, retrofit runs through stud bays, anywhere vibration would crack EMT. Named for inventor Harry Greenfield, but the word is generic in the trade now.
"Run Greenfield from the disconnect to the AC unit so the vibration doesn't kill the connections."
Origin
Named for Harry Greenfield, who co-patented flexible metal conduit in the late 19th century alongside Gus Johnson (the same pair behind early BX cable).
Frequently asked questions
What is Greenfield in electrical trade slang?
Greenfield is flexible metal conduit — the bendy aluminium tube you snake through finished walls.
How do you use Greenfield in a sentence?
"Run some Greenfield through the wall to protect that cable."
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