Power cords connect equipment to AC mains power, and the connector on each end determines whether that connection works at all. The IEC 60320 standard defines the device-side connectors—C1 through C24—while regional standards (NEMA in North America, BS 1363 in the UK, AS/NZS 3112 in Australia) define the wall-plug end. In 15 years of building cable assemblies for OEMs shipping globally, we have seen connector mismatches cause more project delays than any wiring defect.
This guide covers every IEC 60320 connector you will encounter, the NEMA configurations that matter for 120V and 240V equipment, regional plug types for international deployment, and a selection matrix that maps your application to the right cord. Whether you are specifying power cords for a server room, a medical device, or a factory floor, the tables below give you the ratings and standards you need to order correctly the first time.
IEC 60320 connector pairs
Regional plug standards worldwide
Max rating (C19/C20 pair)
Standard IEC voltage rating
IEC 60320 Connector Family: The Complete Reference
IEC 60320 is the international standard governing appliance couplers—the connectors that attach a power cord to equipment. Published by the International Electrotechnical Commission, it assigns each connector a “C” number. Female connectors (the cord end that plugs into a device inlet) get odd numbers; their mating male inlets get the next even number. A C13 connector mates with a C14 inlet. A C19 connector mates with a C20 inlet. No exceptions.
The standard groups connectors by current rating and temperature class. Knowing the group tells you the amperage limit and whether the connector handles elevated operating temperatures. Below is the complete reference for the six connector pairs you will encounter in IT, industrial, medical, and consumer applications.
| Connector Pair | Nickname | Pins | Current | Temp Class | Common Uses |
|---|---|---|---|---|---|
| C1 / C2 | Shaver plug | 2 | 0.2A | 70°C | Electric shavers, toothbrushes |
| C5 / C6 | Cloverleaf / Mickey Mouse | 3 | 2.5A | 70°C | Laptop PSUs, projectors, small appliances |
| C7 / C8 | Figure-8 | 2 | 2.5A | 70°C | TVs, radios, game consoles, battery chargers |
| C13 / C14 | Standard IT cord | 3 | 10A | 70°C | PCs, monitors, switches, routers, UPS |
| C15 / C16 | Hot-condition plug | 3 | 10A | 120°C | Electric kettles, PoE switches, hot equipment |
| C19 / C20 | High-power IT cord | 3 | 16A | 70°C | Servers, PDUs, blade chassis, UPS systems |
C15 vs C13: They Look Almost Identical
The C15 connector has a raised notch on the top edge that prevents it from being inserted into a C14 inlet. A C13 connector, however, fits into a C16 inlet. This one-way compatibility catches engineers off guard—always verify the inlet designation stamped on the equipment chassis before ordering cords.
"The most common power cord mistake we see is engineers treating C13 and C19 as interchangeable because both are three-pin IEC connectors. They are physically incompatible. C19 pins are oriented horizontally; C13 pins are vertical. Ordering the wrong type means every cord ships back at your expense."
Hommer Zhao
Engineering Director
C13 vs C19: Which Power Cord Do You Need?
C13 and C19 account for over 90% of power cords deployed in enterprise IT environments. The choice between them comes down to amperage: C13/C14 handles up to 10A at 250V (2,500W), while C19/C20 handles up to 16A at 250V (4,000W). Rack-mount servers drawing 500W or less use C13. Blade chassis, high-density compute nodes, and PDU input feeds drawing more than 10A require C19.
| Specification | C13 / C14 | C19 / C20 |
|---|---|---|
| Current rating | 10A @ 250V | 16A @ 250V |
| Max power (at 250V) | 2,500W | 4,000W |
| Pin count | 3 (vertical orientation) | 3 (horizontal orientation) |
| Conductor gauge (typical) | 18 AWG – 14 AWG | 14 AWG – 12 AWG |
| Connector width | ~31mm | ~43mm |
| Locking variants | C13 locking (IEC 60320-1) | C19 locking (IEC 60320-1) |
| Primary application | Workstations, network switches, monitors | Servers, PDUs, blade enclosures, UPS |
A practical rule for data center deployments: count the power supplies on the device. Single-PSU devices below 1,200W almost always have C14 inlets. Dual-PSU servers and chassis exceeding 1,500W total draw usually ship with C20 inlets. When in doubt, check the equipment datasheet—the inlet type is listed under “AC Input” specifications. For custom power cable assemblies, specifying the correct IEC connector at the design stage eliminates rework downstream.
NEMA Power Cord Standards (North America)
NEMA (National Electrical Manufacturers Association) defines the wall-plug end of power cords used in the United States, Canada, and Mexico. While IEC 60320 governs the device connector, NEMA governs which wall outlet the cord plugs into. NEMA designations follow the format [configuration]-[amperage][P or R], where P means plug and R means receptacle.
The most common NEMA plug in North America is the 5-15P: a three-prong, 125V, 15A grounded plug that fits every standard household and office outlet. Industrial and cable assembly applications frequently require higher-rated NEMA configurations for 240V circuits or twist-lock connections that prevent accidental disconnection.
| NEMA Config | Voltage | Amperage | Grounded | Locking | Typical Use |
|---|---|---|---|---|---|
| 1-15P | 125V | 15A | No | No | Legacy 2-prong devices, lamps |
| 5-15P | 125V | 15A | Yes | No | Standard office, PCs, monitors |
| 5-20P | 125V | 20A | Yes | No | High-draw equipment, small servers |
| 6-15P | 250V | 15A | Yes | No | 240V equipment, window AC units |
| 6-20P | 250V | 20A | Yes | No | Lab equipment, industrial tools |
| L5-30P | 125V | 30A | Yes | Twist-lock | Generators, portable distribution |
| L6-30P | 250V | 30A | Yes | Twist-lock | Data center PDUs, rack power feeds |
The “L” prefix designates NEMA locking plugs. Twist-lock connectors require a quarter-turn to engage and cannot be pulled out accidentally, making them mandatory in environments subject to vibration or foot traffic. NEC Article 406.9 requires weather-resistant receptacles in damp or wet locations—if your wire harness application involves outdoor power feeds, specify NEMA configurations rated for wet service.
Regional Plug Types: Global Compatibility Map
IEC 60320 standardizes the device end of a power cord worldwide, but the wall-plug end varies by country. OEMs shipping products globally keep the IEC connector constant (usually C13 or C5) and swap the plug end per destination region. This approach—one SKU with region-specific power cords—reduces product variants from dozens to one.
| Plug Type | Standard | Voltage | Grounded | Countries |
|---|---|---|---|---|
| Type A / B | NEMA 1-15 / 5-15 | 120V | B only | USA, Canada, Mexico, Japan (100V) |
| Type C / F | CEE 7/16 / CEE 7/4 | 230V | F only | EU, South Korea, Russia, most of Asia |
| Type G | BS 1363 | 230V | Yes | UK, Ireland, Singapore, Malaysia, UAE |
| Type I | AS/NZS 3112 | 230V | Yes | Australia, New Zealand, China, Argentina |
| Type J | SEV 1011 | 230V | Yes | Switzerland, Liechtenstein |
| Type K | DS 60884-2-D1 | 230V | Yes | Denmark, Greenland |
| Type N | NBR 14136 | 127/220V | Yes | Brazil, South Africa (adapted) |
For global product launches, we recommend maintaining a base cord set covering five regions: NEMA 5-15P (Americas), CEE 7/7 (EU + Schuko), BS 1363 (UK), AS/NZS 3112 (ANZ), and a China/Argentina Type I variant. These five configurations cover approximately 85% of global markets. Additional regional variants (Type J for Switzerland, Type K for Denmark) are typically low-volume add-ons sourced as needed.
Power Cord Selection Matrix by Application
Matching a power cord to an application requires three inputs: the device inlet type (read from the chassis label), the wall outlet standard in the installation country, and the load current. The matrix below maps common applications to the correct IEC connector and recommended NEMA or regional plug.
| Application | Typical Load | Device Connector | Wall Plug (NA) | Wall Plug (EU) |
|---|---|---|---|---|
| Desktop PC / monitor | 200–500W | C13 | NEMA 5-15P | CEE 7/7 |
| Laptop power supply | 45–140W | C5 | NEMA 5-15P | CEE 7/16 |
| Network switch / router | 100–800W | C13 or C15 | NEMA 5-15P | CEE 7/7 |
| Rack server (1U/2U) | 500–1,500W | C13 or C19 | NEMA 5-15P / L6-30P | CEE 7/7 |
| Blade chassis / PDU input | 2,000–8,000W | C19 | L6-30P | IEC 60309 |
| Medical device (Class II) | 100–1,000W | C13 (hospital grade) | NEMA 5-15P HG | CEE 7/7 |
| TV / game console | 50–300W | C7 | NEMA 1-15P | CEE 7/16 |
| Industrial control panel | 500–3,000W | Hardwired / C19 | L6-30P / hardwired | IEC 60309 |
"For OEMs shipping to five or more countries, I recommend designing the equipment with a standard C14 inlet and shipping region-specific wall cords in the box. This approach reduces your BOM to one chassis design while meeting local electrical codes in every market. We build these cord sets in batches of 5,000+ and stock them for JIT delivery."
Hommer Zhao
Engineering Director
Amperage Ratings & Wire Gauge Reference
The conductor gauge inside a power cord determines its ampacity—the maximum continuous current it can carry without exceeding its temperature rating. Using an undersized gauge creates a fire hazard; using an oversized gauge wastes material and makes the cord unnecessarily stiff. NEC Table 400.5(A)(1) specifies ampacity values for flexible cords and cables based on conductor size, number of conductors, and insulation temperature rating.
| AWG | mm² | Ampacity (60°C) | Ampacity (75°C) | Typical IEC Use |
|---|---|---|---|---|
| 18 AWG | 0.82 | 7A | 10A | C5, C7, light-duty C13 |
| 16 AWG | 1.31 | 10A | 13A | C13 (standard), C15 |
| 14 AWG | 2.08 | 15A | 18A | C13 (heavy-duty), C19 |
| 12 AWG | 3.31 | 20A | 25A | C19 (heavy-duty), high-draw |
| 10 AWG | 5.26 | 25A | 30A | L6-30P PDU feeds, industrial |
When specifying power cords for medical device applications, UL 60601-1 requires that the cord be rated for at least 125% of the device’s rated current. A medical monitor drawing 3A at 120V requires a cord rated for at least 3.75A—which means 18 AWG (7A at 60°C) is the minimum acceptable gauge. Hospital-grade cords (identified by a green dot on the NEMA 5-15P plug) add strain relief and contact retention tests per UL 817.
Safety Certifications & Compliance
Every power cord sold commercially must carry safety certifications issued by accredited testing laboratories. These certifications confirm that the cord meets electrical safety, fire resistance, and mechanical durability requirements for its target market. Selling uncertified power cords is illegal in most jurisdictions and exposes the manufacturer to product liability.
North America
- UL 817 — Cord sets and power supply cords
- CSA C22.2 No. 21 — Canadian equivalent
- NOM — Mexico mandatory certification
Europe & International
- CE / EU LVD — Low Voltage Directive 2014/35/EU
- VDE — German safety testing (IECEE CB Scheme)
- CCC — China Compulsory Certification
The IECEE CB Scheme allows a single test report to be recognized by participating national certification bodies in over 50 countries. For OEMs exporting globally, obtaining a CB test report based on IEC 60320 and IEC 60227 covers the device connector and cord construction, then each target market’s NCB (National Certification Body) issues local approval based on that report. This path is faster and cheaper than country-by-country testing. Our certification capabilities page details the standards we support.
5 Power Cord Mistakes That Cost Time and Money
1. Confusing C13 with C19
Both are three-pin IEC connectors, but C19 is physically wider (43mm vs 31mm) with horizontal pin orientation. Ordering 500 C13 cords for C20-inlet servers means 500 cords that do not fit. Always read the inlet marking stamped on the device chassis.
2. Using 18 AWG Cords on High-Draw Equipment
An 18 AWG cord is rated for 7–10A depending on insulation class. Connecting it to a 12A-draw device overheats the conductor, degrades insulation, and creates a fire risk. Match the cord gauge to the device’s maximum rated current plus a 25% safety margin.
3. Ignoring Regional Certification Requirements
A CE-marked cord is not valid in China (requires CCC), Brazil (requires INMETRO), or Japan (requires PSE). Shipping uncertified cords risks customs seizure and product recalls. Map your target markets to required certifications before procurement.
4. Specifying Non-Locking Cords in Vibration Environments
Standard straight-blade NEMA plugs and IEC connectors can work loose under vibration. Factory floors, mobile equipment, and rack-mount servers in seismic zones require either NEMA twist-lock plugs (L-series) or IEC locking connectors (C13L/C19L). A disconnected power cord on a production line shuts down the process.
5. Using Consumer-Grade Cords in Medical Settings
Hospital-grade power cords (UL 817 listed with green-dot identifier) undergo additional pull tests, grounding reliability tests, and blade retention tests. Standard consumer cords fail these requirements. Using non-hospital-grade cords on patient-connected equipment violates NFPA 99 and creates liability exposure.
"Power cord specifications seem simple until something goes wrong. We built a custom cord set for a medical OEM last year where the procurement team initially spec’d standard C13 cords. The compliance review caught it—the device required hospital-grade cords per NFPA 99. That one specification change added $1.40 per cord but prevented a potential FDA recall that would have cost six figures."
Hommer Zhao
Engineering Director
References
- IEC 60320 — Appliance couplers for household and similar general purposes. Wikipedia: IEC 60320
- NEMA Wiring Devices — Dimensional standards for plugs and receptacles. Wikipedia: NEMA Connector
- NEC Article 400 — Flexible Cords and Flexible Cables. National Fire Protection Association, NFPA 70.
- UL 817 — Standard for Safety for Cord Sets and Power-Supply Cords. Wikipedia: UL (Safety Organization)
- IECEE CB Scheme — Mutual recognition of test results for electrical equipment. Wikipedia: IECEE
Frequently Asked Questions
What is the difference between C13 and C19 power cords?
C13 and C19 are both three-pin IEC 60320 connectors, but they differ in current rating and physical size. C13/C14 handles up to 10A at 250V (2,500W max) and is used for PCs, monitors, and network switches. C19/C20 handles up to 16A at 250V (4,000W max) and is used for servers, blade chassis, and PDU input feeds. The connectors are not interchangeable—C19 is 12mm wider with horizontally oriented pins.
I need to power 200 rack servers in a new data center—should I use C13 or C19 cords, and what NEMA plug do I need on the wall end?
Check the power supply inlet on each server model. Single-PSU servers drawing under 1,200W typically have C14 inlets requiring C13 cords. Dual-PSU servers exceeding 1,500W usually have C20 inlets requiring C19 cords. For the wall end in North America, 120V circuits use NEMA 5-15P or 5-20P; 208V/240V circuits use NEMA L6-20P or L6-30P with twist-lock for vibration resistance. Specify the voltage of your PDU circuit before ordering.
Can I use a C13 power cord in place of a C15?
A C13 connector fits into a C16 inlet (one-way compatibility), but a C15 connector does not fit into a C14 inlet due to a raised notch. However, replacing a C15 cord with a C13 cord on equipment designed for C15 removes the 120°C temperature rating—the C13 connector is rated only to 70°C. If the equipment generates significant heat near the inlet (electric kettles, some PoE switches), using a C13 cord creates a thermal safety risk. Use the connector type specified by the equipment manufacturer.
How do I select the right power cord for medical equipment that needs to pass hospital inspection?
Medical equipment requires hospital-grade power cords listed to UL 817 and identified by a green dot on the NEMA plug face. The cord must be rated for at least 125% of the device’s rated current per UL 60601-1. Hospital-grade cords undergo additional testing for grounding reliability, blade retention, and strain relief per NFPA 99. Standard consumer or IT cords are not acceptable—using them on patient-connected equipment violates code and creates liability.
We are launching a product in 8 countries—do we need a different power cord for each market?
Design your equipment with a standard IEC inlet (C14 for most applications, C6 for low-power). Then ship a region-specific wall cord in each box. Five cord variants cover approximately 85% of global markets: NEMA 5-15P (Americas), CEE 7/7 (EU), BS 1363 (UK), AS/NZS 3112 (Australia/NZ), and Type I for China. Obtain a CB test report (IECEE CB Scheme) for the cord to accelerate national certifications. This approach keeps your product hardware identical across all regions.
What AWG wire gauge should I specify for a power cord rated at 15A?
For a 15A continuous load, specify 14 AWG conductors minimum. Per NEC Table 400.5(A)(1), 14 AWG flexible cord conductors are rated for 15A at 60°C or 18A at 75°C insulation class. Using 16 AWG (rated 10A at 60°C) on a 15A circuit violates NEC and overheats the conductor. For cords exceeding 25 feet in length, consider upsizing to 12 AWG to compensate for voltage drop across the longer run.