No More than 1/2" into any Raceway Fitting or Box for NonMetallic Cables. Armored Cable (Type AC) or MC should seat to the end of its associated UL Listed Fitting with the Correct Antishort/RedDevil bushing inserted into the end of the cable to protect the wires.
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Electrical wire sheathing should not project more than about one inch into the electric panel.
The electric panel is something into which electrical wire sheathing shouldn't project more than about an inch. There are recommended guidelines, and non recommended actions, in electrical work. This is such a case, of recommended actions regarding sheathings and panels.
Electric Panel ---------------------------- Based on the answers you have proposed, Electric Panel is the correct choice. However, I do not know of any requirement in the NEC that prohibits the sheathing from extending further into the panel. There is a requirement that it must extend through the connector, but I know of no NEC requirement on when it must stop. --Sparkfighter
When I wire a panel, the outer insulation of the romex does not extend past the romex connector, after the actual conductors have been neatly shaped to the ground / neutral bar and the line has been brought to the breaker the insulation of the hot & neutral is then stripped exposing 1/4 inch of copper then landed.
normally 8 gauge wire is used for electric heat furnaces.