ARTICLE 406
Receptacles, Cord Connectors, and
Attachment Plugs (Caps)
406.1 Scope. This article covers the rating, type, and in- stallation of receptacles, cord connectors, and attachment plugs (cord caps).
406.2 Receptacle Rating and Type.
(A) Receptacles. Receptacles shall be listed and marked with the manufacturer's name or identification and voltage and ampere ratings.
(B) Rating. Receptacles and cord connectors shall be rated not less than 15 amperes, 125 volts, or 15 amperes, 250 volts, and shall be of a type not suitable for use as 1am-pholders.
FPN: See 210.21(B) for receptacle ratings where installed on branch circuits.
(C) Receptacles for Aluminum Conductors. Receptacles rated 20 amperes or less and designed for the direct connection of aluminum conductors shall be marked CO/ALR.
(D) Isolated Ground Receptacles. Receptacles incorpo- rating an isolated grounding conductor connection intended for the reduction of electrical noise (electromagnetic interference) as permitted in
250.146(D) shall be identified by an orange triangle
located on the face of the receptacle.
(1) Isolated Equipment Grounding Conductor Required.
Receptacles so identified shall be used only with equipment grounding conductors that are isolated in accordance with 250.146(D).
(2) Installation in Nonmetallic Boxes. Isolated ground receptacles installed in nonmetallic boxes shall be covered with a nonmetallic faceplate.
Exception: Where an isolated ground receptacle is in- stalled in a nonmetallic box, a metal faceplate shall be permitted if the box contains a feature or accessory that permits the effective grounding of the faceplate.
406.3 General Installation Requirements. Receptacle outlets shall be located in branch circuits in accordance with Part III of Article 210. General installation require- ments shall be in accordance with 406.3(A) through (F).
(A) Grounding Type. Receptacles installed on 15- and
20- ampere branch circuits shall be of the grounding
type. Grounding-type receptacles shall be installed only
on circuits of the voltage class and current for which
they are rated, except as provided in Table 210.21(B)(2)
and Table 210.21(B)(3).
Exception: Nongrounding-type receptacles installed in accordance with 406.3(D).
(B) To Be Grounded. Receptacles and cord connectors that have equipment grounding conductor contacts shall have those contacts connected to an equipment grounding conductor.
Exception No. 1: Receptacles mounted on portable and vehicle-mounted generators in accordance with 250.34.
Exception No. 2: Replacement receptacles as permitted by 406.3(D).
(C) Methods of Grounding. The equipment grounding conductor contacts of receptacles and cord connectors shall be grounded by connection to the equipment grounding conductor of the circuit supplying the receptacle or cord connector.
FPN: For installation requirements for the reduction of electrical noise, see 250.146(D).
The branch-circuit wiring method shall include or provide an equipment grounding conductor to which the equipment grounding conductor contacts of the receptacle or cord connector are connected.
FPN No. 1: See 250.118 for acceptable grounding means. FPN No. 2: For extensions of existing branch circuits, see
250.130.