mcyr
(Marcel Cyr, CMI)
July 18, 2016, 4:03pm
15
(C) Nonmetallic Boxes and Conduit Bodies. Nonmetallic
boxes and conduit bodies shall be suitable for the lowest
temperature-rated conductor entering the box. Where nonmetallic
boxes and conduit bodies are used with messengersupported
wiring, open wiring on insulators, or concealed
knob-and-tube wiring, the conductors shall enter the box
through individual holes. Where flexible tubing is used to
enclose the conductors, the tubing shall extend from the last
insulating support to not less than 6 mm (1⁄4 in.) inside the
box and beyond any cable clamp. Where nonmetallicsheathed
cable or multiconductor Type UF cable is used,
the sheath shall extend not less than 6 mm (1⁄4 in.) inside
the box and beyond any cable clamp. In all instances, all
permitted wiring methods shall be secured to the boxes.
Exception: Where nonmetallic-sheathed cable or multiconductor
Type UF cable is used with single gang boxes
not larger than a nominal size 57 mm × 100 mm (21⁄4 in.
× 4 in.) mounted in walls or ceilings, and where the cable
is fastened within 200 mm (8 in.) of the box measured along
the sheath and where the sheath extends through a cable
knockout not less than 6 mm (1⁄4 in.), securing the cable to
the box shall not be required. Multiple cable entries shall
be permitted in a single cable knockout opening.
Jim and Robert should be able to say if that has changed.
Found it at E 3907.8 of the 2012 IRC
The cable sheath is continuous through the raceway
and extends into the enclosure beyond the fitting not
less than
1
/
4
inch (6.4 mm).