GREENFIELD CONDUIT
Description: This flexible conduit looks like BX armored cable (see this section online), having a hollow, beaded metal jacket. It comes in various diameters.
Buying information: Thin-wall and rigid conduit are not normally used inside the house walls on old work. Greenfield can be, but usually in a limited way -- in lengths under 6 feet. For example, it is a good material to use between a junction box and an electrical fixture.
The reason for using limited lengths is conductivity. As mentioned, all electrical devices must be grounded -- provided with a path to ground for errant electricity -- and Greenfield is not considered a good enough electrical conductor to provide this necessary path.
There are special connectors for securing Greenfield to boxes.
How-to hints: Greenfield can be cut with a hacksaw. To simplify this, cut it on an angle of about 30 degrees, which will result in your cutting just one bead of the jacketing, rather than the two you would cut if you cut straight up and down.
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