Cable connectors

Is it code to require a cable connector in a knockout box? I understand why they should be used, esp. to help prevent the metal edges of the box from cutting the wires, etc.
If so, do they make cable connectors that you can install as an "afterthought," i.e., something that may come in two parts that you can screw on over the wires (or snap on, or...) and otherwise connect to the box without having to disconnect the wires, install the one-piece (most common) cable connector, and then reconnect the wires?
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Wes Stebbins wrote:

Yes, this is required for non-metallic sheathed cable (i.e, Romex) by NEC article 314.17 (B) and (C). At least 1/4" of the cable jacket must extend inside the box past the cable clamp. There is an exception allowing the cable not to be secured to a single-gang non-metallic box if the cable is secured within eight inches of the box.

Raco makes a cable connector called the "Insider" which is installed from the inside of the box, but you'll still need to disconnect the wires. <http://www.hubbell.com/thinkagain/think_files/pdf/4714_INSIDER.pdf
--
-- Steve

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Dude we aint mind readers, what kind of cable? electric? coaxial?
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Assuming you are talking about non metallic electric cable, a company called Arlington Industries makes a connector called a "button" which could be installed with the cable in place and connected

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Yes, a connector is required and there are two piece connectors that can be installed inside or outside the box without removing the cable. Don Young

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Thanks. The post directly above yours states Arlington Industries makes a cable connector called a button that does this. What are some others?
BTW - it is electrical (Romex) wire - 12 - 14 gage.

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