RBM wrote:
"Jon Danniken" wrote in message
...
N8N wrote:
Clamps are required. The knockout holes require separate clamps. The
reason those holes are used is to allow connection of conduit
as well as Romex and BX type cables. (you simply use a different
clamp/ connector for each type of wiring.) If you buy boxes with
integral clamps make sure you get the ones for Romex not BX (they
look similar but are subtly different.)

For Romex, you can also use the little black Arlington buttons
instead of clamps

Thanks for the info. What about the little plastic (often blue in
color) outlet boxes? They have rectangular knockouts on the back
end; is there a clamping fixture for them, or does the wire just
hang freely? Jon
Those don't use or require clamps or connectors, you simply staple
the cable close to the box

Interesting, thanks for that.

Jon