- Mixed IEC C13 and C19 outlet layouts are practical for servers, networking equipment, and high-power devices.
- A custom outlet PDU must match the equipment plug, branch-circuit design, enclosure, and required certifications.
- C13 is commonly used for standard IT equipment, while C19 is intended for higher-power equipment and compatible C20 plugs.
- OEM ODM PDU manufacturer discussions should define outlet position, wiring, protection, monitoring, labeling, and testing before production.
Choosing an IEC C13 C19 PDU is not only a matter of counting sockets. C13 and C19 are different IEC 60320 connector types used for different equipment and power requirements, while a combination outlet can function as both C13 and C19 according to Vertiv’s combination-outlet description. This guide explains what can be customized, how to prepare a specification, and which technical checks reduce compatibility and installation risks.
What Can Be Customized on an IEC C13 C19 PDU?
A custom outlet PDU can usually be adapted in several design dimensions, but customization is limited by electrical safety, enclosure space, manufacturing tooling, and applicable certifications.
| Customization item | Common options | Primary buyer decision |
|---|---|---|
| Outlet family | C13, C19, or mixed | Which equipment plugs must connect directly? |
| Outlet arrangement | Single outlet type or mixed layout | Should high-power loads be separated from standard IT loads? |
| Mounting format | 0U vertical or 1U horizontal | Is rack space or front accessibility the priority? |
| Control level | Basic, metered, or intelligent | Is local distribution enough, or is remote management required? |
| Market interface | IEC, North American, British, European, or other approved input format | Which destination-market standard applies? |
The outlet count and position are often the most visible custom features, but they are not the only ones that affect performance. Buyers may also request a different power cord length, inlet orientation, circuit breaker arrangement, phase configuration, display, network interface, color, label, or mounting bracket.
Mixed C13 and C19 outlets
A mixed configuration is useful when one rack contains both ordinary IT loads and equipment with a higher-power connector requirement. Industry guidance commonly describes C13 as a standard data-center outlet and C19 as the option for loads that exceed typical C13 applications; Comms Express explains the role of C19 and mixed PDU designs.
A mixed layout should be based on the equipment inventory rather than an assumed ratio. For example, a rack may need C13 outlets for network switches and conventional servers, alongside C19 outlets for high-density computing or storage equipment. The manufacturer should confirm the outlet wiring, circuit grouping, and protective-device coordination for the proposed arrangement.
Combination C13 and C19 receptacles
A combination receptacle can reduce outlet-type selection risk when the rack population may change over time. Vertiv describes its combination outlet as a 2-in-1 receptacle that functions as both IEC C13 and C19, which can help accommodate changing rack power requirements.
Combination outlets are not automatically the best choice for every project. They may have different space, cost, availability, and certification considerations compared with separate C13 and C19 receptacles. Ask the supplier for a drawing, compatible plug list, derating information, and test documentation before approving the design.
C13 Versus C19: How Should the Outlet Mix Be Selected?
The correct outlet type is determined by the equipment-side plug and the intended electrical load, not by the PDU name alone.
| Connector | Typical role | Matching equipment question | Customization implication |
|---|---|---|---|
| C13 | Standard IT distribution | Does the device use a compatible C14-side connection? | Often selected in higher quantities for general rack equipment. |
| C19 | Higher-power equipment | Does the device require a compatible C20-side connection? | Requires adequate spacing, circuit planning, and compatible cabling. |
| C13 plus C19 | Mixed rack population | Are both equipment categories present? | Outlet positions should reflect cable reach and service access. |
| 2-in-1 combination | Changing equipment requirements | Would one receptacle type need to support both interfaces? | Confirm the manufacturer’s mechanical and certification details. |
Connector compatibility must be checked at both ends of the cable. A cable-selection guide from Cables Plus USA notes that PDUs with IEC-320 C13 or C19 receptacles may require cables using C14 or C20 plugs on the PDU side and the appropriate equipment-side receptacle. The exact cable must still be selected according to the device, region, temperature requirement, and approved current rating.
How to Specify a Custom Outlet PDU
The safest customization process begins with a complete rack-load schedule rather than a request such as “make a PDU with more outlets.” A supplier can then verify whether the requested arrangement is electrically and mechanically feasible.
- List every device. Record the device name, quantity, plug type, input voltage, expected load, and whether redundant power supplies are used.
- Separate outlet families. Mark which devices require C13 and which require C19, then identify any equipment that may be replaced during the product life cycle.
- Define the rack format. Select 0U vertical mounting for side-of-rack installation or 1U horizontal mounting for a standard 19-inch rack position, subject to the cabinet design.
- Choose the management level. Basic PDU models focus on distribution; metered models provide load information; intelligent models may add remote monitoring, switching, and alarms.
- Confirm the electrical architecture. Specify input connector, phase arrangement, voltage, current, circuit protection, grounding method, and whether the design requires balanced distribution.
- Approve engineering documents. Request a dimensional drawing, wiring diagram, outlet map, nameplate artwork, and prototype or sample approval plan.
- Verify compliance and testing. Confirm the standards, market certifications, factory tests, labeling rules, and inspection records required for the destination market.
The outlet map should show more than a total number. It should identify outlet position, circuit group, label, breaker relationship, and expected cable path. This prevents a technically correct PDU from becoming difficult to install or service.
Which PDU Features Matter Beyond Outlet Count?
Load visibility is often more valuable than additional sockets when a rack is close to its capacity limit. A metered PDU can display or collect current and voltage information, helping operators evaluate single-rack or single-circuit loading. An intelligent model can extend that function with remote monitoring, control, and alarms for distributed facilities.
Installation format affects usable rack capacity and service access. A 0U vertical PDU uses the cabinet side area and does not consume front rack units, while a 1U horizontal model occupies a standard rack position. The best choice depends on cabinet depth, cable routing, airflow, and the location of adjacent equipment.
Phase and load balance become more important as power density increases. Three-phase designs are used for higher-capacity distribution and more balanced power allocation, but they require a suitable upstream supply and a knowledgeable commissioning process. A mixed C13 C19 layout cannot compensate for an incorrectly sized input circuit.
Protection and maintenance features should be specified as part of the PDU, not added as an afterthought. Consider circuit breakers, surge protection where appropriate, over-temperature concerns, replaceable components, labeling, locking provisions, and the accessibility of the inlet and protective devices.
OEM ODM PDU Manufacturer Checklist
An OEM ODM PDU manufacturer should be evaluated on engineering control and documentation as well as the appearance of the finished enclosure.
- Can the supplier provide a complete outlet layout and wiring diagram before production?
- Does the supplier understand C13, C19, C14, and C20 compatibility at the cable level?
- Can the factory support basic, metered, and intelligent models without mixing specifications?
- Are required certifications and destination-market labels clearly identified?
- Can the supplier provide sample inspection, routine testing, and traceable production records?
- Are color, branding, labels, mounting parts, packaging, and documentation included in the quotation?
- Will the supplier confirm minimum order requirements, tooling implications, lead time, and engineering-change control?
Customization is most successful when the buyer supplies a stable technical brief. Changing the outlet mix after enclosure tooling, wiring, or certification work has started can affect cost, delivery, and approval status.
Practical Rack Scenario
A mixed rack illustrates why outlet placement matters. Suppose a cabinet contains standard networking equipment, servers with different inlet requirements, and a later expansion path for higher-density equipment. A single outlet type may leave some devices dependent on adapters or replacement cables, while an intentionally mixed layout can reduce unnecessary conversion points.
The design team should place outlets near the equipment groups they serve, preserve bend radius and airflow, and label the circuit relationship. If two power supplies serve the same device, the A and B distribution paths should be reviewed separately. The final layout should be validated with actual cable lengths and cabinet access, not only with a two-dimensional product drawing.
Frequently Asked Questions
1. Can a PDU have both C13 and C19 outlets?
Yes. Many PDU designs can use a mixed C13 and C19 arrangement, provided the enclosure, wiring, protection, and certification requirements support it.
2. Can I request a specific number of C13 and C19 outlets?
Usually, yes. The supplier should confirm whether the requested count fits the housing, spacing, circuit design, and production platform.
3. Is a C19 outlet always better than a C13 outlet?
No. C19 is intended for compatible higher-power applications, while C13 is commonly suitable for standard IT equipment. The equipment plug and electrical specification should determine the choice.
4. Can one outlet accept both C13 and C19 equipment connections?
Some combination receptacles are designed as 2-in-1 C13/C19 interfaces. Confirm mechanical compatibility and approval documents for the exact model.
5. Should I choose a 0U or 1U PDU?
Choose 0U when side-of-rack installation and preservation of front rack space are priorities. Choose 1U when horizontal mounting and front access fit the cabinet plan.
6. Can a custom PDU include remote monitoring?
Yes. Intelligent PDU configurations can add remote monitoring, switching, and alarms, while metered versions focus primarily on load measurement and display or data collection.
7. What should I send an OEM ODM supplier?
Send the equipment list, plug types, expected load, input requirements, rack format, outlet map, monitoring needs, target market, certification requirements, branding details, and delivery expectations.
 |
Aigo Zhang
Global Sales Director & General Manager, YOSUN Electric
|
Aigo Zhang is the Global Sales Director and General Manager of Ningbo YOSUN Electric Technology Co., LTD — a Chinese PDU (power distribution unit) manufacturer operating since 1999. With 18 years in foreign trade of industrial electrical products, Aigo has led OEM and ODM partnerships with China Mobile, China Telecom, and international brands including ITK, LESCO, and Litech. He writes from inside the sales and engineering side of the business — covering UL/IEC/CE/RoHS certification paths, custom PDU and cabinet-socket specification, data-center power-build requirements, surge protection and remote-monitoring integration, and real OEM project examples — so system integrators and infrastructure buyers can specify YOSUN PDUs with full technical context.
|
18+
Years in industrial electricals
|
150+
Brand partners served
|
120+
Countries reached
|
30+
International certifications
|
| Basic PDU | Metered PDU | Smart PDU | Accessories | Contact Factory |
Post time: Oct-04-2026
