Receptacle Rating and Type
(A) Receptacles. They must be listed for the purpose. They must also be marked with the voltage and ampere ratings and well as the manufacturer's name or identification.
(B) Rating. They can not be rated for less than 15 amperes, 125 volts or 15 amperes, 250 volts. They can not be suitable for lampholders.
(C) Receptacles for Aluminum Conductors. If rated at 20 amperes or less and designed for use with aluminum conductors, they must by marked CO/ALR.
(D) Isolated Ground Receptacles. If there is an isolated ground connection for the reduction of electrical noise it must have an orange triangle on the face for identification. There is additional information noted on these types of receptacles.
General Installation Requirements
They must be located in branch circuits in accordance with Part III of Article 210.
(A) Grounding Type. If installed on a 15 or 20 ampere branch circuit the receptacle must be of the grounding type. They must be installed on circuits of the voltage and current for which they are rated. There are some exceptions.
(B) To Be Grounded. If the receptacle and cord connector has a grounding contact the contact must be effectively grounded. There are 2 exceptions.
(C) Methods of Grounding. The grounding contacts must be grounded by connection to the equipment grounding conductor of the supply circuit. The branch circuit has to have an equipment grounding conductor.
(D) Replacements. If a grounding means exists, then the replacement must be a grounding type receptacle. If a ground fault circuit interrupter protected receptacle is required by the code then it must be used as the replacement. The reader is referred to the code for three requirements for replacement of a nongrounding type receptacle.
(E) Cord and Plug Connected Equipment.
(F) Noninterchangeable Types.
Receptacles must be mounted in boxes or assemblies designed for that purpose. The boxes or assemblies must be securely fastened in place.
(A) Boxes That Are Set Back. In boxes that are set back, the mounting yoke of the strap of the receptacle must be held rigid at the finished surface.
(B) Boxes That Are Flush. In this case the mounting yoke or strap must be held rigid against the box or box cover.
(C) Receptacles Mounted on Covers.
(D) Position of Receptacle Faces. After installation the receptacle must be flush with or project from the insulating material and must project a minimum of 0.4 mm (0.015 in.) from a metal faceplate. There is an exception.
(E) Receptacles in Counter Tops and Similar Work Surfaces in Dwelling Units. The receptacles cannot be installed in a face-up position in these cases.
(F) Exposed Terminals. The receptacles have to be enclosed so that live wiring terminals are not exposed.
Receptacle Faceplates (Cover Plates)
Receptacles in Damp or Wet Locations
(A) Damp Locations. If a receptacle is installed outdoors where it is protected from the weather or in any other damp location, it must have a weatherproof enclosure when the attachment plug is not inserted.
(B) Wet Locations. 15- or 20-ampere receptacles that are located in a wet location must have an enclosure that is weatherproof whether or not the attachment plug is inserted. There are specific rules for all other types of receptacles.
(C) Bathtub and Shower Space. Receptacles cannot be installed directly over or within a bathtub space or shower stall.
(D) Protection for Floor Receptacles. Standpipes for floor receptacles must allow for cleaning the floor without damaging the receptacle.
(E) Flush Mounting with Faceplate. The enclosure must be made weatherproof by means of a weatherproof faceplate assembly.
Grounding-Type Receptacles, Adapters, Cord Connectors, and Attachment Plugs.
Grounding-type receptacles must have a grounding slot. Grounding-type plugs must have a grounding prong and this prong must make contact first. The ground pole must be distinctively marked and it must not be used for any other purpose. There are requirements listed for grounding-pole identification. The reader is referred to the Code® for all the requirements.
Connecting Receptacle Grounding Terminal to Box
An equipment bonding jumper is to be used. There are four other methods that can be used for specific conditions.
Article 90 Introduction
Wiring and Protection
Wiring Methods and Materials
Equipment for General Use
Annex C. Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size
Annex D. Examples
Annex E. Types of Construction