Ya sea que esté recableando su casa, cambiando un tomacorriente o simplemente tenga curiosidad sobre los diversos tomacorrientes eléctricos en la habitación, podría interesarle conocer los dos tipos diferentes de tomacorrientes eléctricos. Aunque pueda parecer una pregunta de examen, es importante conocer esta información al comprar tomacorrientes eléctricos, planificar la remodelación de la casa o determinar la seguridad de su casa antigua. En términos generales, todos los enchufes eléctricos pertenecen a dos familias básicas, y una vez que entienda esas familias, le será bastante fácil navegar por el complejo universo de los tomacorrientes eléctricos. En otras palabras, el documento responderá preguntas comunes sobre la clasificación de los dos tipos diferentes de enchufes eléctricos, su apariencia, precio relativo y otros factores importantes.
Respuesta rápida: Los tomacorrientes eléctricos (a menudo denominados puntos eléctricos, enchufes de pared o sockets) están disponibles en solo dos tipos principales: enchufe con tierra y enchufe sin tierra. Un enchufe sin tierra de dos clavijas se denomina tipo Nema 1-15, y el enchufe con tierra de tres clavijas se llama tipo Nema 5-15. Los enchufes con tierra son tomacorrientes estándar de tres clavijas que tienen un pin adicional redondo de conexión a tierra. Los enchufes con tierra se dividen en varias categorías según el voltaje y los amperios, como los enchufes de 120V (15A y 20A).
Las Dos Variedades Básicas de Receptáculos Eléctricos
La pregunta “los receptáculos eléctricos vienen en cuáles dos variedades básicas” se responde de dos maneras comunes, y ambas son correctas dependiendo del contexto:
Respuesta 1: Por conexión a tierra — sin conexión a tierra vs. con conexión a tierra
| Variedad | Clavijas | Tipo NEMA | Estado en Hogares Modernos |
|---|---|---|---|
| Receptáculo sin conexión a tierra | 2 clavijas | NEMA 1-15 | Obsoleto — se encuentra solo en casas antiguas |
| Receptáculo con conexión a tierra | 3 clavijas | NEMA 5-15 (y 5-20) | Estándar — requerido para construcción nueva |
Tiene dos ranuras planas, por lo que el tomacorriente sin conexión a tierra de dos clavijas se conoce como un enchufe Tipo A. El tomacorriente con conexión a tierra de tres clavijas, también llamado enchufe Tipo B, tiene un pin redondo de conexión a tierra además de las dos ranuras planas para una conexión segura al sistema de tierra del edificio. En el caso de los códigos de construcción recientes, existe la obligación de tener enchufes con conexión a tierra en todas partes en edificios nuevos, así como actualizar cualquier enchufe sin conexión a tierra al hacer renovaciones en una habitación en caso de inspección.
Respuesta 2: Por voltaje — 120V vs. 240V
| Variedad | Voltaje | Usos Comunes | Amperaje Típico |
|---|---|---|---|
| Estándar / uso general | 120V | Lámparas, televisores, teléfonos, computadoras, pequeños electrodomésticos de cocina | 15A o 20A |
| De alta potencia / electrodomésticos | 240V | Secadoras, estufas, unidades de aire acondicionado, cargadores de vehículos eléctricos, soldadoras | 15A–50A |
Los enchufes de 120 voltios alimentan la gran mayoría de los dispositivos domésticos. Los enchufes de 240 voltios (con sus distintivos diseños de clavijas) alimentan grandes electrodomésticos que necesitan el doble de potencia. Si desea entender la diferencia en detalle, nuestra guía sobre la diferencia entre enchufes de 120V y 240V lo explica con ejemplos.
Diferentes Nombres para lo Mismo: Tomacorriente, Enchufe, Receptáculo
Antes de continuar con nuestra discusión, aclaremos algunos términos ya que el mismo dispositivo tiene múltiples nombres — todos correctos:
- Receptáculo eléctrico — el término técnico oficial que utilizan los electricistas y los códigos escritos
- Enchufe de corriente o enchufe eléctrico — el término común en inglés británico y en la mayor parte de Asia
- Toma de corriente o simplemente toma — el término usado en el inglés americano para referirse a este dispositivo
- Punto de energía — un término usado por los australianos y neozelandeses
- Enchufe de pared — otro término popular usado en inglés británico
Estrictamente hablando, “receptáculo” es el dispositivo que está fijo en una pared y recibe el enchufe, mientras que “toma” significa la ubicación del suministro eléctrico (lo que también puede implicar la luminaria). Sin embargo, en el lenguaje hablado se usan indistintamente, al igual que “enchufe” y “toma”. Para un análisis más detallado de la terminología y anatomía, consulte nuestro artículo sobre qué es un receptáculo eléctrico.
Cómo se clasifican los receptáculos: el sistema NEMA
El sistema de clasificación utilizado para todos los receptáculos norteamericanos fue desarrollado por la National Electrical Manufacturers Association (NEMA) y tiene un código para la clasificación. Por ejemplo, el código 5-15R se desglosa de la siguiente manera:
- El primer dígito (es decir, 5) indica el tipo de familia de configuración y muestra el voltaje y la conexión a tierra.
- El segundo dígito (es decir, 15) define la clasificación de amperaje.
- La letra denota el tipo de receptáculo (R) en oposición al enchufe (P).
| Código NEMA | Voltaje | Amperaje | Clavijas | Uso común |
|---|---|---|---|---|
| 1-15R | 120V | 15A | 2 | Tomas antiguas sin conexión a tierra (obsoletas) |
| 5-15R | 120V | 15A | 3 | Standard household outlet |
| 5-20R | 120V | 20A | 3 | Kitchens, bathrooms, laundry |
| 6-15R | 240V | 15A | 3 | Window AC, small equipment |
| 6-20R | 240V | 20A | 3 | Air compressors, power tools |
| 14-30R | 120/240V | 30A | 4 | Electric dryers |
| 14-50R | 120/240V | 50A | 4 | Ranges, RV hookups, EV chargers |
If you want to learn more about the different styles used in sockets, take a look at our posting on types of electrical sockets as it discusses both NEMA types used in North America and other international plug types.
120V Receptacles: The Everyday Outlets
These are the outlets you use every day. All are grounded (except the obsolete 2-prong type) and rated for 120 volts.
NEMA 5-15R — The Standard 15A Outlet
- Look: Two vertical slots (one of which is a bit wider) and a round hole below
- Electrical rating: 120 volts, 15 amps (power consumption approx. 1800 watts)
- Application: Typically mounted in the bedrooms, living rooms, hallways and other types of general-purpose circuits
- Type: This type of outlet is the most common one, which people usually think of when imagining a wall outlet
NEMA 5-20R — The 20A Outlet
- Appearance: Similar to 5-15R, except that one receptacle is in the shape of a sideways T.
- Rating: Rated for 120 Volts, 20 Amperes (handles around 2,400 watts).
- Installation: Used in kitchens, bathrooms, laundry rooms, garages, or anywhere else with 20 Amps of current.
- Compatibility: Compatible with 15 Amps.
NEMA 1-15R — The Old 2-Prong Outlet
- Feature: Simply dual vertical openings, without any circular aperture.
- Capacity: 120V; 15A minimum, but it does not have grounding.
- Present in: Houses constructed prior to the ’60s.
- Caution: Not safe for connecting computers, gadgets, or machinery, and it must be augmented.
Our comparison of 2-prong vs. 3-prong outlets explains the safety differences in detail.
240V Receptacles: The Heavy-Duty Outlets
240-volt outlets deliver double the voltage for big appliances. They have distinctive prong arrangements that prevent accidentally plugging a 120V device into them.
| Tipo NEMA | Clasificación | Apariencia | Typical Appliance |
|---|---|---|---|
| 6-15R / 6-20R | 240V, 15–20A | Two horizontal slots + round ground | Window AC, compressors |
| 10-30R | 120/240V, 30A | Three prongs, no ground (pre-1996 dryers) | Old electric dryers |
| 14-30R | 120/240V, 30A | Four prongs (L-shaped neutral) | Modern electric dryers |
| 14-50R | 120/240V, 50A | Four prongs | Ranges, RV parks, EV chargers |
Key points in the context of code: Code has mandated that all new dryer and range circuits that operate on 240V must come with 4-wire connections or the 14-series type in which the connection is grounded. The alternate 3-wire 10-series cannot be employed in new installations anymore.
Appearance Differences at a Glance
Here’s how to tell the basic varieties apart just by looking at them:
| Receptacle | Slots | Distinguishing Feature |
|---|---|---|
| 2-prong ungrounded (1-15R) | 2 vertical slots | No round hole at all |
| 3-prong 15A (5-15R) | 2 vertical + 1 round | Both slots vertical, round ground below |
| 3-prong 20A (5-20R) | 1 vertical + 1 T-shaped + 1 round | Sideways T slot on the left |
| 240V straight-blade (6-15R/6-20R) | 2 horizontal + 1 round | Both slots horizontal |
| Dryer (14-30R) | 3 slots + 1 round | L-shaped neutral slot |
| Range/EV (14-50R) | 3 slots + 1 round | Larger, L-shaped neutral |
Examine the face plate either: the TEST and RESET buttons are present in a GFCI outlet; tamper-resistant outlet has sliding shutters in the openings and a USB outlet has USB ports on the face plate.
Special-Purpose Receptacles: GFCI, TR, USB
Beyond the two basic varieties, modern receptacles add safety and convenience features:
| Tipo | Qué hace | Where Required | Precio |
|---|---|---|---|
| Receptáculo GFCI | Trips the circuit if it detects current leaking to ground (prevents shock) | Bathrooms, kitchens, garages, outdoors, basements | $10–$25 |
| Tamper-resistant (TR) | Internal shutters block objects inserted by children | Required in all new residential construction | $2–$5 |
| USB receptacle | Built-in USB-A / USB-C charging ports | Optional — desks, nightstands, kitchens | $15–$45 |
| Receptáculo AFCI | Detects dangerous arcing in wiring | Bedrooms and living areas (circuit-level) | $15–$30 |
| Combination switch/outlet | Switch and receptacle in one device | Where a switched outlet is needed | $4–$12 |
For a full overview of the four main outlet categories used in homes, our article on the 4 types of electrical outlets is a quick, visual reference.
Which Receptacle for Which Room?
| Location | Recommended Receptacle | Why |
|---|---|---|
| Bedroom / living room | 15A TR receptacle | Tamper-resistant required; 15A plenty for general use |
| Kitchen countertop | 20A GFCI receptacle | Code requires GFCI within 6 ft of sink; 20A for small appliances |
| Baño | 20A GFCI | GFCI mandatory near water |
| Garage / workshop | GFCI + a 240V 6-20R | GFCI for wet/damp conditions; 240V for tools |
| Laundry room | GFCI 20A + 14-30R dryer outlet | Wet area + dryer circuit |
| Outdoors | Weather-resistant GFCI (WR-GFCI) | Must resist weather and ground faults |
| EV charging | 14-50R (or hardwired charger) | 50A capacity for fast charging |
| Desk / nightstand | USB + TR receptacle | Convenient charging, child-safe |
Price Guide: What Outlets Cost
| Tipo | Retail Price | Brand Name Price |
|---|---|---|
| Basic 15A 3-prong receptacle | $1–$3 | $2–$5 |
| 20A receptacle | $2–$5 | $4–$8 |
| Tamper-resistant 15A | $2–$4 | $3–$6 |
| Receptáculo GFCI | $10–$18 | $15–$25 |
| USB receptacle (dual port) | $12–$25 | $20–$45 |
| Receptáculo AFCI | $15–$25 | $20–$30 |
| Dryer receptacle (14-30R) | $8–$15 | $12–$20 |
| Range/EV receptacle (14-50R) | $10–$20 | $15–$30 |
There are differences among brands, finishes (like white, ivory, black, brass), and certification (UL certified vs. unlisted generic) that cause the price to change. Also, installation by professionals may cost from USD 50 to 150 for each outlet depending on the place of installation and the condition of wiring.
Top Receptacle Brands
| Marca | Country | Price Tier | Known For |
|---|---|---|---|
| Leviton | EE.UU. | Mid | Decora designer line, wide selection, reliable |
| Eaton / Cooper Wiring | EE.UU. | Mid | Commercial-grade durability, commercial installs |
| Legrand (Pass & Seymour) | France/USA | Mid-High | Designer finishes, smart outlets |
| Hubbell | EE.UU. | High | Industrial-grade receptacles, extreme reliability |
| GE (Current) | EE.UU. | Budget-Mid | Everyday outlets, widely available |
| Kopp / Belanko | Alemania | Mid | European-style quality sockets |
| IGOTO | China | Value | Smart switches and sockets, OEM for global brands |
| Schneider Electric | Francia | Mid-High | Unica and Clipsal lines, global standards |
For everyday residential use, Leviton and Eaton are the most-installed brands in North America. If you want premium finishes or smart features, Legrand and Schneider lead the way. Our guide to top 10 wiring devices brands in the world goes deeper into each manufacturer’s strengths.
Preguntas frecuentes
What are the different types of electrical receptacles?
Electrical outlets belong to two main categories, namely the ungrounded outlets (with two prongs) and the grounded outlets (with three prongs). Other classifications could be made vertically. The types of electrical receptacles that are commonplace today include: NEMA 1-15 (now obsolete 2-prong), NEMA 5-15 (standard 15-amp 3-prong outlet), NEMA 5-20 (20 amps with T-shaped hole), NEMA 6-15/6-20 (240 volts tools), NEMA 14-30 (for electric dryers) and NEMA 14-50 (for electric range and recreational vehicle). Using special kinds of outlets provides additional advantages.
What are the two types of outlets that are found in an electrical system?
In electrical systems, there are two main varieties of outlets: the 120-volt outlets (the general-purpose electric outlets which are used for powering small devices such as lamps, electronic gadgets and other household equipment) and the 240-volt outlets (which are high-power outlets for home appliances such as dryers, ovens, air conditioners and EV chargers). The other way of identifying the two different types of outlets can be through grounding which refers to two types of outlets namely two-prong ungrounded outlets (found in older homes now considered obsolete) and three-prong grounded outlets (the current standard). They basically refer to the two distinct ways in which devices consume electricity from different types of outlets.
What are the two types of electrical systems?
Almost everyone talks of two kinds of electric systems namely, single-phase and three-phase systems. Single-phase systems (usually 120/240 volts) are utilized in most residences. They have two hot conductors and one neutral wire. Three-phase systems (208 volts or 480 volts) are utilized in industrial and commercial settings to deliver higher amounts of power more effectively and run heavy motors. Residential installations almost always rely on single-phase electricity. There may be a few instances where a household may use some form of three-phase electric equipment such as a water well pump, a workshop, or a solar inverter.
What are the two basic categories of electrical switches?
Electrical switches fall under two primary classifications: the single-pole switch that allows control of one electrical load from a single position and the three-way switch that gives control of an electrical load from two locations. Other classifications exist, among them the four-way switch (which is used when controlling a light from three or several locations) and special-type switches such as smart switches, timers, and dimmers. However, single-pole and three-way switches remain the two most important types of electric switch. The single-pole switch consists of two terminals, while the three-way switch is composed of three terminals.
Referencias
- NEMA (National Electrical Manufacturers Association) — The standards body that defines the NEMA receptacle configuration system (1-15, 5-15, 6-15, 14-30, 14-50, etc.) used throughout North America.
- NFPA 70 (National Electrical Code) — The code that governs receptacle requirements, including GFCI protection locations, tamper-resistant outlets, and 4-wire 240V circuits.
- UL Standards for Plugs and Receptacles — UL 498 covers the safety requirements for attachment plugs and receptacles sold in the United States.
- OSHA Electrical Safety — U.S. workplace safety guidance on receptacles, grounding, and GFCI requirements.
- U.S. Department of Energy — GFCI Outlets — Practical guidance on how GFCI receptacles work and how to test them.
- Leviton Receptacle Catalog — Manufacturer reference showing the range of receptacle types, from basic 15A outlets to GFCI, TR, and USB models.
Conclusión
So, what are the two general types of electrical outlets? The simple answer is ungrounded (2-prong) and grounded (3-prong), or more simply put, 120V general purpose and 240V heavy duty. This makes the conclusion very clear:
- For everyday use, go for grounded 15 or 20 amp receptacles, as they are inexpensive, safe and compliant.
- For wet locations (bathroom, kitchen, garage, outdoors) you need to use GFCI outlets, as they can save your life and are required by the code.
- For heavy machinery use proper 240V NEMA outlet instead of modifying 120V outlet for those appliances.
- In case of renovation of old building, make sure you replace old 2-prong ungrounded outlets with grounded outlets (or GFCI protected).
Thus, no matter where you want to buy a receptacle you have an idea where to begin.
