FIELD GUIDESource-led reference

P290 / Power / Connector

NEMA 10-50R receptacle

NEMA 10-50R is a legacy non-grounding three-wire receptacle designation and must not be collapsed with four-wire grounding NEMA 14-50R.

Also called NEMA 10-50R 10-50R legacy 50 A non-grounding receptacle

A familiar shell, blade or coding family does not establish voltage, current, wiring, grounding, mating or safe operation.

Look for

Read the NEMA identifier and qualified electrical documentation; this record is identification-only and does not approve a legacy-circuit modification.

Claim inspection dates: 2026-10-06, 2026-10-22 · Independent review pending

The useful distinction

Recognize it. Then verify it.

NEMA 10-50R is a legacy non-grounding three-wire receptacle designation and must not be collapsed with four-wire grounding NEMA 14-50R. [C290A]

Exact source example 5050-P00: construction: Surface-mount3pole3wire non-grounding receptacle per detailed description; thermoplastic body; side-wired galvanized-steel strap. rating: 50 A125/250 V. Exact manufacturer part; construction, role and regional rating remain scoped. No physical compatibility, pin map or hardware validation is established. [C290B]

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Nominal contacts3S319Source-backed nominal position/contact/conductor count for identification: 3. Not a wiring diagram or installation instruction.
Connector rolesocket (5050-P00)S319Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5050-P00. Documented role: socket. Manufacturer specification for named part only. No mating-face pin numbering, connector dimension or contact pitch inferred from wire acceptance ranges.; SEO heading says Grounding; detailed product description and Electrical Specifications say Non-Grounding. Retain conflict in source qualification; no universal wiring claim.
ManufacturerLeviton (5050-P00)S319Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5050-P00. Documented role: socket. Manufacturer specification for named part only. No mating-face pin numbering, connector dimension or contact pitch inferred from wire acceptance ranges.; SEO heading says Grounding; detailed product description and Electrical Specifications say Non-Grounding. Retain conflict in source qualification; no universal wiring claim.
Exact part / implementation5050-P00 (5050-P00)S319Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5050-P00. Documented role: socket. Manufacturer specification for named part only. No mating-face pin numbering, connector dimension or contact pitch inferred from wire acceptance ranges.; SEO heading says Grounding; detailed product description and Electrical Specifications say Non-Grounding. Retain conflict in source qualification; no universal wiring claim.
Recorded markingsManufacturer documents permanent ratings on this exact device. (5050-P00)S319Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5050-P00. Documented role: socket. No literal legend, placement or individual specimen transcription is asserted. Manufacturer specification for named part only. No mating-face pin numbering, connector dimension or contact pitch inferred from wire acceptance ranges.; SEO heading says Grounding; detailed product description and Electrical Specifications say Non-Grounding. Retain conflict in source qualification; no universal wiring claim.

Not recorded: Positions / cavity span, Populated contacts, Contact rows, Contact pitch, Dimensions / axis, Contact gender / arrangement, Mounting, Coupling / latch, Keying / polarization, Shell / form, Series, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

NEMA 10-50R receptacle facts and limitations
Documented identification3-position/contact/conductor recognition fact in the cited implementation. [C290A]
Mechanical dimensionsNo independently reviewed mechanical drawing in V47; do not use this page for fabrication, fit testing, receptacle selection or tolerance work.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
No electrical replacement approval.

Use the source-backed connector name and position/contact count only for identification. Resolve circuit or system requirements, wiring, grounding, protocol, ratings, device support and installation requirements from the exact equipment and component documentation.

Before you connect

What to check

  1. Identify the exact connector family and variant from equipment, component or cable documentation.
  2. Keep physical form, contact count, electrical rating, wiring and device support as separate facts.
  3. Do not force, rewire, adapt or energize a connector from this recognition record; resolve the remaining requirements with qualified documentation first.
Trace a supported connection class →

What is not established

This field note does not approve a connection, adapter, cable assembly, rewiring scheme, energized test, installation or fabricated part. It intentionally omits unsupported wiring assignments and mechanical tolerances.

Your next step

Move from the form to the requirement.

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

Back to first citation ↑
C290ASource checked · pending review

Leviton identifies 5050-P00 as a NEMA 10-50R, 50 A, 3-pole 3-wire non-grounding receptacle.

Leviton · 5050-P00 NEMA 10-50R receptacle ↗

Locator: Product description and Technical Information
Access: public page. Identification/reference scope only. V47 does not turn this source into a universal wiring map, installation approval, safe-use recommendation, fabrication drawing or end-to-end compatibility verdict.

S319: full source recordInspect review dependencies → (private workspace)

Claim scope: V47 identification fact only; the cited product establishes the named connector/configuration and narrow position/conductor context, not universal wiring, mating, installation safety or interchangeability.. Next review due 2027-01-04.

Back to first citation ↑
C290BSource checked · pending review

Exact source example 5050-P00: construction: Surface-mount3pole3wire non-grounding receptacle per detailed description; thermoplastic body; side-wired galvanized-steel strap. rating: 50 A125/250 V. Exact manufacturer part; construction, role and regional rating remain scoped. No physical compatibility, pin map or hardware validation is established.

Leviton · 5050-P00 NEMA 10-50R receptacle ↗

Locator: Product description and Technical Information
Access: public page. Identification/reference scope only. V47 does not turn this source into a universal wiring map, installation approval, safe-use recommendation, fabrication drawing or end-to-end compatibility verdict.

S319: full source recordInspect review dependencies → (private workspace)

Claim scope: Exact named component/family technical construction reference from the full current primary document; geometry, ratings and implementation limits do not transfer to other variants.. Next review due 2027-01-20.

Suggest a correction to this field note →

Put this field note to work.

Add to discovery trayRecord an unsaved candidate (private workspace)

Compare look-alikes: NEMA 10-50R versus 14-50R receptacles

Candidate selection does not confirm the identity or capabilities of your physical item.

Evidence behind this page

Scope first. Source second. Approval separate.

1 linked sources · 2 scoped claims · 0 sources with inspection/access flags.

Page scope: catalogue_expansion_v47

Assessment 2026-10-22 · earliest scheduled source review 2027-01-04. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 1 source scopes, access limits and dates

S319 · 5050-P00 NEMA 10-50R receptacle

Leviton · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Primary manufacturer identification reference for NEMA 10-50R receptacle: V47 normalizes the named connector designation and 3-position/contact/conductor context only.

Not established / limitations: Identification/reference scope only. V47 does not turn this source into a universal wiring map, installation approval, safe-use recommendation, fabrication drawing or end-to-end compatibility verdict.

Locator: Product description and Technical Information

Trace 2 claims to their source records

C290A · P290

Leviton identifies 5050-P00 as a NEMA 10-50R, 50 A, 3-pole 3-wire non-grounding receptacle.

Claim scope: V47 identification fact only; the cited product establishes the named connector/configuration and narrow position/conductor context, not universal wiring, mating, installation safety or interchangeability.

Source links: S319 · Evidence trail → (private workspace)

C290B · P290

Exact source example 5050-P00: construction: Surface-mount3pole3wire non-grounding receptacle per detailed description; thermoplastic body; side-wired galvanized-steel strap. rating: 50 A125/250 V. Exact manufacturer part; construction, role and regional rating remain scoped. No physical compatibility, pin map or hardware validation is established.

Claim scope: Exact named component/family technical construction reference from the full current primary document; geometry, ratings and implementation limits do not transfer to other variants.

Source links: S319 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.