20A Standard Duplex Receptacle NEMA 5-20R
- 20A 125V NEMA 5-20R duplex receptacle with standard T-slot configuration
- Non-tamper-resistant indoor outlet for placements where NEC 406.12 exceptions apply
- T-slot geometry accepts both 15A and 20A compatible plug patterns
- Built for heavy-duty indoor replacement, MRO sourcing, and dedicated equipment loads
- Non-WR standard device format for dry-location applications only
- Seven finish options support retrofit color matching across commercial and industrial interiors
Available Colors
What is a NEMA 5-20R T-slot receptacle
A 20 amp duplex receptacle is a 20A 125V grounding duplex outlet identified by its T-slot neutral opening. This non-TR, non-WR configuration is used to distinguish a true 20A receptacle from a standard 15A 5-15R device and to support equipment that requires a 20A plug pattern. The T-slot format also accepts standard 15A plugs, which makes the device useful in commercial and industrial spaces where mixed plug types appear on the same 20A branch circuit. This page should therefore be positioned around heavy-duty indoor replacement, MRO sourcing, and dedicated equipment loads rather than around general light-duty outlet replacement. NEMA 5-20R compatibility and the 2023 NEC TR exception structure are the key compliance anchors behind that positioning.
Who Should Use This Model
- Contractors sourcing 20A NEMA 5-20R receptacles for dedicated indoor equipment circuits
- MRO buyers replacing worn T-slot outlets in maintenance, workshop, and facility environments
- Distributors that need a non-TR 20A duplex option for commercial and industrial replacement demand
- Procurement teams handling server rooms, equipment areas, copy rooms, or back-of-house loads that call for 20A receptacle geometry
When to Choose a Different Model
- Choose a 15A NEMA 5-15R receptacle when the project is built around standard 15A outlet geometry rather than 5-20R T-slot configuration
- Choose a TR receptacle when the installation falls under NEC 406.12 required locations
- Choose a WR or GFCI device when the environment or branch-circuit protection requirement calls for those features rather than a standard indoor receptacle
20 amp duplex receptacle ratings and configuration Specifications
| Product Code | TMDR20 |
| Certified Safety | UL/cUL Listed |
| GFCI Type | Not GFCI |
| Voltage | 125V AC |
| Amperage | 20A |
| NEMA | 5-20R |
| USB Rating | None |
| USB A | None |
| USB C | None |
| Color | White, Black, Ivory, Almond, Grey, Brown, Graphite |
| Finish | Standard smooth finish |
| Application Sector | Heavy-duty indoor replacement, MRO sourcing, dedicated equipment loads, commercial and industrial interiors |
| Features | Standard duplex format, grounding type, NEMA 5-20R T-slot, non-TR, non-WR |
| Wiring Method | Back Wire and Side Wire |
| Pole | 2-pole, 3-wire grounding |
| Wall Plate Included | Yes |
| Number of Receptacles | Duplex (2) |
| Standards & Certifications | UL Listed / UL 498 |
| Grounding | Yes |
| Trip Level | Not applicable |
| Safety Function | Standard grounding receptacle |
| Tamper Resistant | No |
| Weather Resistant | No |
| Own US Patents | Yes |
| Face Material | Thermoplastic |
| Body Material | Thermoplastic |
| Terminal | Side and Back Wire |
| Country of Origin | China |
Frequently Asked Questions (FAQ)
What does the T-slot on a NEMA 5-20R receptacle mean?
The T-slot identifies a 20A NEMA 5-20R receptacle. That slot geometry distinguishes the device from a standard 5-15R outlet and shows that the receptacle is designed for 20A plug compatibility.
Can a standard 15A plug be used in this receptacle?
Yes. A NEMA 5-20R receptacle is designed to accept both standard 15A plug patterns and 20A plug patterns. That is one reason the T-slot format is useful in mixed-load commercial and industrial spaces.
Can a 20A receptacle be installed on a 20A branch circuit?
Yes. A 20A NEMA 5-20R receptacle is the correct receptacle type when the project is built around 20A outlet geometry and a matching 20A branch-circuit application.
How is this receptacle different from a 15A standard outlet?
The difference is the face configuration and plug compatibility. A standard 15A NEMA 5-15R receptacle does not have the 5-20R T-slot geometry, while a 20A 5-20R receptacle does and is intended for applications that call for 20A receptacle configuration.
Where can a non-TR 20A receptacle be used under NEC 406.12?
NEC 406.12 allows non-TR receptacles only under its stated exceptions. The 2023 exception list covers receptacles located more than 1.7 m (5 1/2 ft) above the floor, receptacles that are part of a luminaire or appliance, not-readily-accessible receptacles within the space designated for cord-and-plug-connected appliances that are not easily moved, and certain nongrounding replacement receptacles permitted by 406.4(D)(2)(a).
Can this non-TR receptacle be used in general dwelling-unit or guest-room locations?
No. NEC 406.12 requires listed TR receptacles in dwelling units, hotel and motel guest rooms and guest suites, and other listed public-access occupancies unless one of the section’s exceptions applies.
Is this a weather-resistant or GFCI receptacle?
No. This is a standard indoor duplex receptacle. It is not WR and it does not provide GFCI protection.
Why is this receptacle relevant for MRO and equipment replacement work?
The value is the 5-20R T-slot configuration. Buyers searching for replacement receptacles in equipment areas, server rooms, workshops, and other heavy-duty indoor locations usually need to confirm that the outlet face is a true 20A pattern rather than a standard 15A format.
where to use a non-TR 20A receptacle Applications
Office Interiors
15A or 20A covers desks, printers, and displays. Back-wire terminals speed crew installation across tenant build-outs.
UL · cUL · NEMA 5-15R / 5-20R
Residential Walls
Bedrooms, hallways, and living rooms outside NEC 210.8 GFCI zones. TR versions satisfy NEC 406.12 for new builds.
UL · cUL · TR · NEC 406.12
Retail & Commercial
Retail floors and checkouts need AC drops rated for commercial duty. 20A spec-grade handles heavier loads.
UL · cUL · 20A Commercial
Warehouse & Industrial
Packing stations and utility zones run shop tools and chargers. Holds 12 AWG stranded in back-wire.
UL · cUL · 20A · NEMA 5-20R
NEMA 5-15R vs 5-20R outlet differences Video Overview
5-Step Quick Wiring Guide
Follow standard U.S. wiring protocols. Always verify power is off before installation.
- Power Off & Verify: Turn off the breaker and verify the box is de-energized with a voltage tester.
- Identify Conductors: Locate the Black (Hot), White (Neutral), and Bare/Green (Ground) wires.
- Connect Ground: Secure the bare copper or green wire to the Green grounding terminal.
- Connect Neutral & Hot: Connect the White wire to the Silver terminal, and the Black wire to the Brass terminal.
- Mount & Test: Fold wires neatly into the box, mount the receptacle, install the wall plate, and restore power to test.
Product Categories
Send the target market, rating, color, quantity, packaging needs, and any TR / WR / OEM requirements before final quotation.
