Power Connector & Plug Types: Country and NEMA Guide

This buyer guide covers A–O with selected country examples, seven NEMA configurations, and common appliance-end pairs; it is not an exhaustive country or installation guide. Choose the market, supply voltage/frequency, grounding arrangement, load, cable, and exact end fittings together before requesting a power-cord assembly quote.

Mains plug types by country

The A–O letters are a starting point for identifying regional mains interfaces. The table covers all fifteen letters with selected example countries, not every country or every socket used within them. Voltage and frequency below belong to the named country entries in IEC World Plugs, not to a universal rating for that plug letter. Multiple values within an entry are retained as listed.

Source basis: the IEC World Plugs page archived on 2026-08-16, retrieved 2026-10-30. The live IEC URL returned HTTP 403 during this review, so these are historical reference values, not newly verified utility or regulatory data. In each row, semicolon-separated voltage and frequency entries follow the country order. Confirm the actual installation before ordering.

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Check Voltage, Grounding, and the Exact National Plug

The country examples show why the letter alone is insufficient: Type A appears in both the United States and Japan, whose listed supply values differ. Brazil’s entry retains both 127 V and 220 V. A plug adapter changes the mechanical interface; it does not establish that the equipment accepts the local supply or that the protective-earth path is suitable.

For grounded equipment, specify a complete protective-earth path through the approved plug, cable, and equipment inlet. Do not treat a two-pin alternative as equivalent. The IEC type descriptions also distinguish Type E’s earthing-pin contact from Type F’s side contacts and describe CEE 7/7 as accommodating both arrangements. The same source describes a fuse in Type G. Confirm the exact national part and its certification documents; a letter-based illustration is not a purchasing specification.

NEMA plug configurations

This selected NEMA plug chart covers four straight-blade and three locking configurations for power-cord RFQs. It is a transcription of configuration ratings from Qualtek’s manufacturer charts, not an installation design or a claim about our assemblies. These are connector configuration ratings; the country table above gives nominal mains supply values.

Reading NEMA Codes: Configuration, Amperes, P and R

In 5-15P, “5” identifies the configuration family, “15” the ampere rating, and “P” the plug; “R” identifies the mating receptacle. A leading “L” identifies a locking configuration. This naming convention is illustrated in Americord’s NEMA charts (retrieved 2026-10-30). Specify the complete designation, rather than only the voltage or number of pins.

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Straight-Blade Versus Locking, Grounded Versus Ungrounded

Specify locking retention when the application requires resistance to unintended unplugging, while checking access for insertion and rotation. Locking does not itself establish an ingress-protection rating. The Qualtek diagrams distinguish the ungrounded 1-15 from grounded 5-15 and 5-20, and show different contact arrangements for 6-20, L5-30, L6-30, and L14-30. Their shared current values do not make them interchangeable.

For a mixed-voltage configuration such as L14-30, keep the 125/250 V designation intact and provide the intended circuit and conductor arrangement for engineering review. Never substitute L6-30 merely because both entries are rated 30 A. Confirm the actual receptacle and approved equipment connection before ordering.

IEC 60320 Appliance-End Pairing

The wall plug does not determine the appliance connector. Specify C7 to C8, C5 to C6, C13 to C14, C15 to C16, or C19 to C20 as required by the actual equipment inlet. In these pairs, the first designation identifies the cable connector and the second the appliance inlet. C7/C8 has no protective-earth contact; the other pairs listed here include one. See MAG’s IEC 60320 interface guide (retrieved 2026-10-30).

Check temperature class and regional ratings as well as mating geometry. For example, Interpower’s C13/C19 angle-connector guide lists its C13 products at 10 A internationally and 15 A in North America, and its C19 products at 16 A internationally and 20 A in North America (retrieved 2026-10-30). Those are the cited manufacturer’s component ratings, not blanket ratings for every cord using that shape. Release the complete assembly to the limits of its approved construction.

Connector selection errors: ratings, fit and termination

A connector can meet the load rating yet fail the assembly drawing: the contact may reject the specified conductor, the backshell may foul the enclosure, or the termination may need tooling that was omitted from the quote. Check the exact mating parts, wire range, panel clearance, retention and termination process together. The wire harness connector selection guide covers these interface checks in more detail.

Power connector families and applications

Separate AC mains and appliance interfaces from low-voltage DC, sealed field power, board-to-wire and battery connections. The table below compares their roles; a product with several power branches may need several families. For application-specific builds, see battery cable assemblies and M12 cable assemblies.

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Note: A connector that mates is not necessarily a connector that qualifies. Current rating, temperature rise, creepage, sealing, keying, and approval path still have to match the actual build.

Current derating, protection and service conditions

Compare the intended load with the manufacturer’s rating conditions: conductor size, ambient temperature, circuit loading and duty cycle. Resolve differences before approving a part; there is no universal derating percentage. For higher-voltage battery branches, the EV high-voltage wire harness guide covers the additional insulation and protection review.

Specify touch protection, keying, locking and service access where required. Sealing must apply to the intended mated condition, and retention, plating and mating-cycle requirements must match the environment. Agree whether field termination is permitted or the supplier must deliver a pre-terminated assembly. Record these requirements in the RFQ and inspection table below.

RFQ and Incoming Inspection Checklist

Use the following table as the acceptance record for the drawing, BOM and supplier response. At incoming inspection, check mains-cord markings and polarity, sealed connectors in their specified mated condition, and battery-contact retention and termination quality. The wire harness quality testing guide explains how to define the test evidence.

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How Plug Choice Changes a Power-Cord Assembly RFQ

Specify one controlled cord-set BOM per destination market. Include the country and installation socket, nominal supply and frequency, equipment inlet, maximum operating load, cord length, and required national certification. The cord-set maker and OEM must establish who obtains and maintains the required market-specific approvals and who verifies the finished equipment. A plug letter or a component certificate alone does not establish approval of the complete assembly.

Our build-to-specification scope is to assemble the agreed cable and specified, certified parts against the released drawing and BOM. Identify those exact parts and their supporting documents before release; required cord-set or end-product certification remains a separate responsibility to resolve with the maker/OEM for each market. This is not a claim that our company holds UL, CSA, BS, or VDE approvals.

• National plug and documentation: Give the manufacturer part number, applicable local standard, required certification scheme and certificate scope, grounding/polarization requirements, and any specified plug fuse. Do not release a generic “EU plug” or “US plug” purchase line.
• Cord type and jacket: State the permitted cord designation and service environment, not only “PVC cable.” For example, SJT identifies a thermoplastic construction; an outdoor or oil-exposed application needs the corresponding documented cable properties. National cable designations and approved constructions are not interchangeable by appearance. See Interpower’s cable designation guide (retrieved 2026-10-30).
• Conductor size versus assembly rating: Specify conductor count and AWG or mm², including protective earth where required. Check ampacity, voltage drop over the cord length, ambient temperature, bundling, terminal wire range, jacket diameter, and strain relief. A larger plug rating does not upgrade a smaller conductor or appliance connector. Use the power cable assembly guide for the broader sizing review.
• Appliance end and orientation: Give the IEC connector and mating inlet designations plus exact part numbers, temperature class, exit angle, and retention needs. Identify both ends of a PDU jumper separately from a wall-plug cord set.
• Release evidence: Request the applicable certificates for the plug, cable, and appliance connector, confirmation that their combination is covered, marking artwork, and the agreed inspection and electrical-test plan. Specify acceptance limits from the applicable product requirements rather than inventing a universal test voltage.

Interpower’s approvals and markings guidance explains that plug and connector approvals can restrict the allowed cable types, with cable documentation separate again (retrieved 2026-10-30). Check the scope and validity for the ordered construction, not just whether a supplier can show a certificate.

Drawing package and supplier response

Attach the released drawing/BOM or sample photos, prototype and annual quantities, target lead time, and approved brands or alternates. Use the market-specific fields above and the inspection table to capture the technical requirements once. Ask the supplier to return a marked-up specification, sourcing and tooling exceptions, proposed electrical-test limits, and a first-article approval plan before volume release.

XT60 vs XT90: Check the Exact DC Battery Connector

XT60 and XT90 are DC battery-connector families, not country-specific mains plugs. Do not interpret the series number as a guaranteed continuous-current rating. The AMASS manufacturer catalogue, printed pages 13 and 21, gives separate current and conductor conditions for XT60 variants and XT90H/XT90HW/XT90S variants (retrieved 2026-10-30). Use the current product specification for the exact ordered suffix, contact finish, and cable construction.

Compare the required load and duty, approved conductor range, termination process, polarity, available space, retention, and sealing. The catalogue identifies XT90S-F as an anti-spark version; that feature does not establish suitability for every battery voltage, capacitance, or connection sequence. Ask engineering to confirm the intended inrush-control arrangement. If the application needs positive latching, select a part with documented retention performance rather than relying on a family name.

Request a Power-Cord Assembly Quote

Submit the RFQ package above through our contact page, with unresolved requirements marked for engineering or certification review.

Sources and Methodology

Retrieved 2026-10-30. We manually compiled the A–O table from the country list and plug descriptions in IEC World Plugs, archived 2026-08-16. We selected one or two example markets for each letter, preserved the listed voltage/frequency alternatives, and added unit spacing for readability. The live IEC source was attempted but returned HTTP 403. The archive date describes the source snapshot; the retrieval date describes this review. No values were inferred from a neighbouring country or from plug appearance, and no global averages were calculated.

We manually selected the seven NEMA configurations shown and read each voltage row and current column in Qualtek’s non-locking chart and locking chart, page 1 of each. The selection is deliberately limited to the configurations discussed here and is not the full NEMA catalogue. We retained 125/250 V as printed, added the P/R designations, and checked the ratings against Americord’s manufacturer chart. We did not infer wire gauge, allowable continuous load, frequency, or national certification from those ratings. Where a requested property is absent from a cited source, the value is not stated, not estimated.

Manufacturer links in the appliance-end, cable, approval-documentation, and battery sections support those separate selection checks. These tables are reference comparisons, not dimensional drawings, certification records for our company, or substitutes for current component specifications and the destination market’s requirements.

Frequently Asked Questions

What are the main power cable plug types?

For a mains cord, identify the country-specific plug or NEMA configuration at the supply end and the IEC 60320 connector at the appliance end. Other power connections may use DC barrel, circular, board-to-wire, or battery connectors. Specify both mating interfaces and their electrical ratings.

Can countries with the same plug type use the same cord set?

Not automatically. Supply voltage and frequency, national plug variants, cable requirements, and certification scope may differ. Match the complete approved construction and equipment input requirements to each destination, even if the plugs look alike.

What is the difference between NEMA 5-15 and 5-20?

The cited configuration chart rates 5-15 at 15 A and 5-20 at 20 A, both at 125 V. They have different plug patterns. Select against the actual receptacle and complete cord-set rating; changing the plug does not increase the capacity of the cable or equipment connector.

What current margin should buyers use?

There is no universal connector derating percentage. Review the manufacturer’s rating conditions and derating guidance for conductor size, circuit loading, ambient temperature, and duty cycle. Resolve any difference between those conditions and the intended application before approving the part.

Are circular power connectors better than IEC or NEMA connectors?

Choose by application. A suitably specified circular connector can provide sealing, keying, and retention for field equipment. IEC 60320 and NEMA interfaces serve appliance and mains connections. Shell shape alone establishes neither electrical suitability nor environmental protection.

Who confirms national certification for a custom cord set?

The cord-set maker and OEM must define the approvals required for the destination market and end product, verify the covered plug/cable/connector combination, and assign responsibility for certification and marking. Building with specified certified parts is not, by itself, certification of the finished assembly or equipment.

How should I choose between XT60 and XT90?

Compare the manufacturer’s current specification for the exact variants, including conductor range, load and duty, retention, sealing, and termination. Do not use 60 or 90 in the family name as a continuous-current guarantee. Specify an anti-spark variant only after confirming its suitability for the battery system.