IEC C13 vs C14 vs C15 Power Cords: How to Choose for Data Centers and AV
The IEC 60320 family of connectors powers almost every piece of professional AV, IT, and data center equipment in the world. If you have ever opened a server rack and found a tangle of black cords with “C13”, “C14”, and “C15” stamped on the plugs, you are not alone — the naming looks identical until you need to pick the right one. This guide explains the physical and electrical differences between IEC C13, C14, and C15 power cords, and how to match the correct cord to your equipment.
A quick orientation: the IEC 60320 family
IEC 60320 defines a family of “figure-8” and “C” connectors. The letter C stands for the connector shape (a “C” profile), and the number indicates the pin configuration and amperage class:
| Connector | Pins | Common amperage | Typical role |
|---|---|---|---|
| C6 | 2-pin | 10 A | Small devices, figure-8 |
| C5 (Molex/Klein) | 2-pin | 10 A | Laptop power, “Mickey Mouse” |
| C13 | 3-pin | 10 A / 15 A | Male plug — the standard “kettle” plug |
| C14 | 3-pin | 10 A / 15 A | Female socket — the standard inlet |
| C15 | 3-pin | 15 A / 20 A | Male plug — high-current version |
| C16 | 3-pin | 15 A / 20 A | Female socket — high-current inlet |
The relationship to remember: C13 and C14 are the 10 A / 15 A pair; C15 and C16 are the 15 A / 20 A pair. A C13 plug inserts into a C14 socket. A C15 plug inserts into a C16 socket. C14 and C16 sockets share the same face and are physically compatible with both plugs — the higher amperage socket accepts the lower amperage plug.
C13 vs C15: the difference that matters for load
C13 and C15 plugs look almost identical. The difference is the center (live) pin thickness and the rated amperage:
- C13 — thinner center pin, rated 10 A or 15 A depending on the listing. This is the default cord for servers, switches, patch panels, and most rack-mounted IT equipment.
- C15 — thicker center pin, rated 15 A or 20 A. Used where higher current is needed: large UPS units, laser projectors, amplifiers, and high-density racks.
Because the pins differ, a C15 plug cannot safely be forced into a C14 socket, and the socket will resist it. If your equipment has a C14 inlet but you are loading it near its maximum, step up to a C15-rated cord and confirm the inlet and breaker can support the higher current.
How to choose the right cord
- Look at the equipment inlet. A C14 socket (the three-hole “face” with two flat outer contacts and a round center) takes a C13 or C15 plug. A C16 socket takes a C15 plug.
- Check the nameplate current. If the device is rated 10 A, a C13 cord is correct. If it is rated 15 A or 20 A, use a C15 cord.
- Match the gauge. 10 A equipment pairs with 18 AWG (or 0.75 mm²); 15–20 A equipment should use 16 AWG or 14 AWG (1.0–1.5 mm²) to keep voltage drop and heating under control, especially at rack lengths of 2 m or more.
- Match the certification to the market. US installations need UL-listed C13/C14 cords; EU installations need CE/ENEC; data center buyers increasingly specify locking variants (C13/C14 with latching) to prevent accidental disconnection.
- Consider color coding. Professional installers color-code cords by circuit or zone (black, blue, red, yellow) to keep a high-density rack serviceable.
Data center and rack best practices
In dense racks, cord selection is a reliability decision, not just a fit decision:
- Use locking C13/C14 or C15/C16 cords on critical equipment so vibration and accidental bumps do not disconnect a live server.
- Keep cord lengths consistent (typically 2 m) so cable management is clean and current is evenly distributed.
- Do not daisy-chain extension cords through a PDU — feed equipment directly from the PDU outlet.
- Verify the PDU outlet amperage matches the cord rating before installing a C15 (higher-current) cord on a circuit that only supports 15 A.
How HENG-WELL can help
HENG-WELL manufactures the full IEC 60320 C13, C14, C15, and C16 range, including standard and locking variants, in 10 A and 15/20 A ratings, with cable gauges from 18 AWG to 14 AWG. We supply data center, AV, and industrial buyers with cords matched to the exact inlet, current, and certification each installation requires — and we provide the certification documentation to back every listing.
Tell us the equipment, the current rating, the cord length, and the destination market, and we will specify the correct C13/C14/C15 cord with the right gauge and certification before you order.
HENG-WELL — power cords and connectors manufactured to global standards since 2011.
IEC 60320 Connectors in a 125 V System: Why C5 and C7 Are the Real Trap
The connector end has its own rating — and the voltage changes it
The equipment end of a North American cord is usually an IEC 60320 connector: C5, C7, C13, C15, C17 or C19. These connectors carry a rating printed on the certificate, and that rating is stated for a voltage system.
Here is where most quoting errors begin: a connector’s current rating at 250 V is not its rating at 125 V.
C5 and C7: the dual-voltage derating
The small connectors are the ones that catch people out.
C5 — the “Mickey Mouse” three-pole connector — and C7 — the “figure-8” two-pole connector — are both rated:
7 A at 125 V, but only 2.5 A at 250 V.
The 7 A figure is a 125 V statement. When a C5 or C7 lead is used in a 250 V system, the rating collapses to 2.5 A, and it must be written that way. Carrying the 7 A figure into a 250 V description is the single most common over-claim in figure-8 and Mickey-Mouse leads.
These connectors are also physically small, and they accept only the lighter flexible cords — typically 18 AWG.
C13: the connector is not the limit
C13 is the familiar three-pole “kettle” connector. Its certificate figure of 10 A at 250 V is widely repeated as though it applied everywhere — and that is where the 125 V error comes from.
In a 125 V North American assembly, the C13 connector is not the binding constraint. The rating follows the cable:
| Cable | C13 assembly rating |
|---|---|
| 18 AWG | 10 A |
| 16 AWG | 13 A |
| 16 AWG HPN | 15 A |
| 14 AWG | 15 A |
So the same C13 on the same plug is legitimately 10 A, 13 A or 15 A — depending on the cord behind it. A C13 lead on 16 AWG SJT cord is a 13 A lead, not a 10 A lead.
C15 and C19: two connectors with restricted cable
C15 is the high-temperature version of C13, used on appliances that generate heat — kettles, rice cookers, warming equipment. It is rated 10 A on 18 AWG and 13 A on 16 AWG, and it does not accept flat SPT cable. It is built on HPN or SJT round cord.
C19 is the larger three-pole connector used for the equipment end of PDU and UPS leads. Its rating ladder is:
| Cable | C19 assembly rating |
|---|---|
| 18 AWG | 10 A |
| 16 AWG | 13 A |
| 14 AWG | 15 A |
| 12 AWG | 20 A |
C19 is also excluded from flat cable — it requires round heavy-duty cord (SJT).
C17: the ungrounded connector
C17 is the two-pole ungrounded connector, used on double-insulated equipment. It takes 2-core cable and follows the same ladder pattern:
| Cable | C17 assembly rating |
|---|---|
| 18 AWG | 10 A |
| 16 AWG | 13 A |
| 16 AWG HPN | 15 A |
And as with all ungrounded connectors, count the conductors: a C17 lead is a 2-core lead, and pairing it with 3-core cable is a defect.
Reference table
| Connector | Poles | Cable | Rating |
|---|---|---|---|
| C5 | 3 | 18 AWG | 7 A @ 125 V ／ 2.5 A @ 250 V |
| C7 | 2 | 18 AWG | 7 A @ 125 V ／ 2.5 A @ 250 V |
| C13 | 3 | 18 / 16 / 16 HPN / 14 AWG | 10 / 13 / 15 / 15 A |
| C15 | 3 | 18 / 16 AWG | 10 / 13 A — no flat cable |
| C17 | 2 | 18 / 16 / 16 HPN AWG | 10 / 13 / 15 A |
| C19 | 3 | 18 / 16 / 14 / 12 AWG | 10 / 13 / 15 / 20 A — no flat cable |
What to write on the label
State the connector, the cable and the current together:
C13, 16 AWG SJT, 13 A, 125 V✅C13, 10 A, 125 V← incomplete; says nothing about the cable, and understates a 16 AWG assemblyC7, 7 A← ambiguous; is that 125 V or 250 V? At 250 V it is 2.5 A ❌
Why it matters
A figure-8 lead labelled 7 A that is used at 250 V is a 2.5 A product sold as a 7 A product. That is not a rounding difference — it is a defect with a paper trail, and it is one of the easiest things for a technical reviewer to spot.
The safe habit is simple: never quote a connector rating without the voltage system and the cable that carries it.
本篇是「北美电源线」系列第 3 篇。下一篇：整线额定的三条铁律与标准配置。
HENG-WELL supplies moulded cordsets terminated with C5, C7, C13, C15, C17 and C19 connectors. Tell us the equipment end, the current and the supply system and we will confirm the assembly rating.
