Frames of
electric ranges, wall-mounted ovens, counter-mounted cooking
units, clothes dryers, and outlet or junction boxes that are
part of the circuit for these appliances shall be connected to
the equipment grounding conductor in the manner specified
in Section E3908.9. [250.140 amended]
Exception: For existing branch-circuit installations only
where an equipment grounding conductor is not present in
the outlet or junction box, the frames of electric ranges,
wall-mounted ovens, counter-mounted cooking units,
clothes dryers, and outlet or junction boxes that are part of
the circuit for these appliances may be connected to the
grounded circuit conductor if all of the following conditions
are met. [250.140 Exception]
- The supply circuit is 120/240-volt single-phase, 3- wire connected system. [250.140 Exception (1)]
- The grounded conductor is not smaller than 10 AWG copper or 8 AWG aluminum. [250.140 Exception (2)]
- The grounded conductor is insulated, or the grounded conductor is uninsulated and part of a type SE service-entrance cable and the branch circuit originates at the service equipment. [250.140 Exception (3)]
- Grounding contacts of the receptacles furnished as part of the equipment are bonded to the equipment. [250.140 Exception (4)]