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NEMA Plug & Receptacle Configuration Reference: Wiring Diagrams & Ratings

Identify NEMA Connector Types by Amperage, Voltage, and Grounding Configuration

Free NEMA plug and receptacle reference covering all common residential, commercial, and industrial connector configurations. Look up any NEMA designation (1-15, 5-15, 5-20, 6-20, 6-50, 10-30, 14-30, 14-50, L5-30, L6-30, L14-30, L21-30, and more) to see amperage, voltage, grounding type, blade configuration, and typical applications.

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NEMA designations follow a systematic pattern: the first number is the configuration type (blade arrangement and voltage), the second number is the amperage rating. Locking types use an "L" prefix. This reference decodes every common configuration and shows which plug fits which receptacle, which is critical for preventing mismatched connections that can damage equipment or create shock hazards.

Pro Tip: The most common field mistake is confusing NEMA 10-30 (older 3-wire dryer, no separate ground) with NEMA 14-30 (modern 4-wire dryer with separate ground). They look similar but are NOT interchangeable. NEMA 10 series uses the neutral as a combined neutral-ground path, which is no longer permitted for new installations per NEC 250.140. If you see a 3-prong dryer outlet, it is a NEMA 10-30 and should be upgraded to 14-30 during any electrical work.

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NEMA Plug & Receptacle Reference
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How It Works

  1. Find by NEMA Designation

    If you know the NEMA number (e.g., 14-50), search or scroll directly to that configuration. The reference shows full specifications and blade diagram.

  2. Find by Application

    If you know the application (dryer, range, welder, RV), browse by category to find the correct NEMA designation.

  3. Find by Voltage and Amperage

    Filter by voltage (125V, 250V, 125/250V, 3-phase) and amperage (15A, 20A, 30A, 50A, 60A) to narrow results.

  4. Review Blade Configuration

    See the blade pattern diagram showing which prong is hot, neutral, and ground. Straight-blade and locking configurations shown.

  5. Check Grounding Type

    Verify whether the configuration includes a separate equipment grounding conductor. NEMA 10 series does NOT have separate ground; NEMA 14 series does.

Built For

  • Electricians identifying existing receptacles for replacement or upgrade
  • Homeowners determining the correct plug type for appliances, EV chargers, and shop equipment
  • RV owners identifying campground power connections (TT-30, 14-50)
  • Welders and fabricators matching plug configurations to welder power requirements
  • Industrial electricians selecting locking receptacles for machinery connections
  • Generator installers matching transfer switch outlets to load requirements
  • Electrical inspectors verifying correct receptacle type for the circuit rating

Features & Capabilities

Complete NEMA Coverage

Straight-blade: 1-15, 5-15, 5-20, 6-15, 6-20, 6-30, 6-50, 10-30, 10-50, 14-30, 14-50, 14-60, 15-30, 15-50. Locking: L5-15, L5-20, L5-30, L6-20, L6-30, L14-20, L14-30, L15-30, L21-30.

Blade Configuration Diagrams

Visual diagrams showing blade arrangement, prong shape, and terminal identification for correct wiring.

Voltage and Amperage Specs

Rated voltage (125V, 250V, 125/250V, 3-phase 120/208V) and amperage for each configuration.

Application Cross-Reference

Common applications listed for each configuration: dryer, range, EV charger, welder, RV, air compressor, etc.

Grounding Identification

Clear indication of grounding type: 2-pole 2-wire (no ground), 2-pole 3-wire (with ground), 3-pole 3-wire (no ground), 3-pole 4-wire (with ground).

PDF Export

Export NEMA reference data as a branded PDF for panel schedules, shop posting, or customer education.

Frequently Asked Questions

Both are 125/250V 4-wire grounding configurations. NEMA 14-30 is rated 30 amps (dryers, some RV connections). NEMA 14-50 is rated 50 amps (ranges, EV chargers, RV power). They have different blade configurations and are not interchangeable.
The L prefix indicates a locking (twist-lock) configuration. The plug twists and locks into the receptacle, preventing accidental disconnection. Used in industrial, generator, and temporary power applications where a secure connection is critical.
Yes. NEMA 5-15 plugs fit NEMA 5-20 receptacles because the 5-20 receptacle has a T-shaped neutral slot that accepts both 15A and 20A plugs. This is by design and permitted by NEC. However, a NEMA 5-20 plug will NOT fit a NEMA 5-15 receptacle.
Most Level 2 home EV chargers use NEMA 14-50 (50A, 240V) or are hardwired. Some smaller units use NEMA 6-20 (20A, 240V) or NEMA 14-30 (30A, 240V). Check the charger manufacturer specifications for the required receptacle type. Tesla Wall Connector and most modern EVSEs are hardwired.
NEC 250.140 allows existing NEMA 10-30 and 10-50 installations to remain in service (grandfathered). New installations require NEMA 14 series with separate equipment grounding conductor. When replacing a dryer or range, the NEC allows continued use of existing NEMA 10 wiring but requires the appliance bonding jumper to be installed.
Disclaimer: NEMA configurations per NEMA WD 6 standard. Wiring must comply with NEC and local electrical codes. Incorrect wiring of plugs and receptacles creates shock and fire hazards. All electrical work should be performed by a qualified electrician and inspected by the authority having jurisdiction.

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