Three standards, one cord
Quick answer
- A power cord answers to three separate standards at once, one for the mains plug, one for the equipment connector, and one for the flex cable.
- A current rating is not a current limit. A 10A plug does not restrict what the equipment draws, so the complete cord must suit the equipment.
- Access Communications stocks power cords with full RCM certification across the mains plug, IEC connector, and flex cable.
A power cord actually answers to three separate standards at once, one for the mains plug, one for the equipment connector, and one for the flex cable running between them, each doing a different job. Once you see the split, the confusion mostly disappears. The complete assembly must also suit the equipment, the supply connection, and the conditions of use, and a connector that fits does not mean the cord is suitable.
Guide Index
- The Three Standards at a Glance
- AS/NZS 3112: The Mains End
- IEC 60320: The Equipment End
- AS/NZS 3191: The Flex Itself
- What a Current Rating Means
- Real-World Examples
- Common Pairings, Compared
- Pairings That Need Care
- Where Suppliers and Installers Get This Wrong
- Reading a Cord's Label for Yourself
- How to Check Any Cord Yourself
- Frequently Asked Questions
The Three Standards at a Glance
| Standard | Governs | Common Ratings | Compliance Mark |
|---|---|---|---|
| AS/NZS 3112 | Mains plug and wall socket, physical fit, current from the wall circuit | 10A, 15A, 20A, 25A, 32A | RCM |
| IEC 60320 | Equipment connector, the shape that mates with the device | C13/C14 (10A), C19/C20 (16A) | RCM |
| AS/NZS 3191 | The flex cable itself, construction, insulation, and current-carrying capacity | Rated by voltage class and current | RCM |
A single detachable power cord typically carries all three standards at once, two governing the ends, one governing the cable running between them. That's normal, not a red flag.
AS/NZS 3112: The Mains End
AS/NZS 3112 is the Australian and New Zealand standard for domestic wall plugs and sockets. It governs physical fit and what a wall circuit can safely deliver, nothing about the equipment at the other end of the cord.
- 10A plug: two flat pins, standard-width earth pin, matching the active and neutral pins. Fits both 10A and 15A wall sockets.
- 15A plug: wider earth pin, a deliberate design feature that physically prevents it fitting a standard 10A socket.
- 20A, 25A, 32A plugs: further pin variations for heavier industrial loads, rarely seen outside dedicated circuits.
See our full Australian Mains Plug Variants guide for the complete breakdown of every current-rated plug type.
IEC 60320: The Equipment End
IEC 60320 is an international standard for appliance couplers, letting a manufacturer build one universal device and simply swap the country-specific mains cable depending on where it's sold.
| Pair | Rating | Width x Height | Common Use | Diagram |
|---|---|---|---|---|
| C13/C14 | 10A, 70°C | 29.0mm x 20.8mm | PCs, monitors, switches, general IT |  |
| C19/C20 | 16A, 70°C | 44.0mm x 24.0mm | Servers, PDUs, UPS units, rack equipment |  |
See our full Guide to IEC Connectors for the complete connector reference table, dimensions, and compatibility rules.
AS/NZS 3191: The Flex Itself
AS/NZS 3191 governs the flexible cord itself, the cable running between the mains plug and the equipment connector, not either end. It specifies construction, insulation material, dimensions, and testing for the cord, a genuinely separate compliance category from both connector standards.
This means a cord can have a fully compliant mains plug and a fully compliant IEC connector, and still be missing valid certification for the flex joining them. Imported cable built to overseas standards is a common example, a US UL-listed cord may be electrically sound but isn't automatically compliant here without AS/NZS 3191 certification or a recognised harmonised equivalent.
What a Current Rating Means
A current rating states the conditions a plug, connector, or cable is designed to operate under. It does not mean the part restricts the current flowing through it.
A 10A plug is not a 10A current limiter. The connected equipment decides how much current is drawn. General power circuits are commonly protected at 16A or 20A, so the circuit breaker will not necessarily trip before a 10A plug or cable is overloaded.
A detachable power cord is made up of a mains plug, a flex cable, and an equipment connector, each with its own rating and construction requirements. Compliance has to address the combination as supplied. Individually approved components do not, by themselves, show that every possible assembly is compliant.
Never exceed the rating of the complete cord assembly, or any limit that applies to the outlet or the equipment. Staying within those limits is necessary, but it does not on its own show that a particular combination of connectors complies with the relevant standards. Cord sets and interconnection cord sets may also be covered by IEC 60799, where applicable.
The flex cord's own certification under AS/NZS 3191 is a separate question entirely, it's about the cable's construction and insulation, not about the connector ratings at either end.
Real-World Examples
A small rack-mount UPS. Many 1 to 3kVA UPS units are built with a standardised C19 or C20 inlet. The inlet type alone does not tell you how much current the unit draws, and a 3kVA unit can draw more than 10A at full load. Check the unit's input rating and the manufacturer's instructions, then choose a cord assembly rated for it, including the mains plug.
A PDU feeding a rack of switches. A rack PDU often has a C20 inlet at the wall end and a bank of C13 outlets along its length. The supply cord for that C20 inlet, including its mains plug, must suit the PDU's rated input, not just the shape of the connector. Each individual C13 outlet only ever supplies what the device plugged into it actually draws.
A network switch or server with a standard IEC inlet. Most general IT equipment uses a C14 inlet, rated 10A, paired with a standard 10A mains plug. Since both ends match, this is the simplest and most common cord type, and it's the one least likely to raise any questions at all.
Common Pairings, Compared
| Mains End | Connector End | What to Know |
|---|---|---|
| 15A mains plug | C19 (16A) | Confirm the complete assembly's rating and the documentation for the exact model. |
| 10A mains plug | C19 (16A) | Needs particular attention. The C19 can connect to equipment that draws more than the 10A plug is rated for. See Pairings That Need Care below. |
| 10A mains plug | C13 (10A) | Ratings match. Standard, everyday cord. |
| C13/C14 forced onto C19/C20 via adapter | Mismatched families | Avoid |
Pairings That Need Care
C19 connectors with a 10A mains plug or C14 plug connector. These combinations need particular attention because a C19 connector can connect to equipment that draws more current than the 10A connection upstream is rated for. Access Communications previously withdrew a 10A mains plug to C19 product following advice from the Queensland Electrical Safety Office. We are seeking updated clarification on these combinations and any applicable compliance pathways.
We do not recommend assuming a combination is acceptable because it is advertised elsewhere, marked "10A maximum", or intended for commercial use. Adding a fuse or circuit breaker also requires assessment of the complete assembly and does not automatically establish compliance.
Adapters between C13/C14 and C19/C20. C13/C14 and C19/C20 are physically shaped so they cannot connect to each other directly, deliberately, to stop a 10A-rated connector being forced onto a 16A-rated one. At 29.0mm by 20.8mm, C13/C14 is a noticeably smaller connector body than C19/C20 at 44.0mm by 24.0mm, the size difference is intentional, not incidental. A C13 cord will not fit a C20 inlet, and a C19 cord will not fit a C14 inlet.
The real risk shows up when an adapter overrides that protection. Forcing these two connector families together typically limits the whole assembly to the lower connector's rating regardless of what the adapter is marked as, and can result in poor contact, overheating, or fire. Do not modify plug pins, bypass protective features, or use an adapter to overcome an incompatible supply connection.
Where Suppliers and Installers Get This Wrong
Assuming a connector that fits means the cord is suitable. The shape or individual rating of a connector does not establish the rating or compliance of the complete cord. Check the equipment instructions and the documentation for the exact cord assembly.
Confusing partial certification with full certification. A cord can have a fully compliant mains plug and a fully compliant IEC connector and still be missing valid certification for the flex itself under AS/NZS 3191. All three components, the mains plug, the IEC connector, and the flex cord, need their own valid approval for the finished cord to be genuinely compliant. When sourcing from a new supplier, ask for test documentation covering all three, not just the connector certifications.
Not checking for the RCM mark on all three components. A compliant cord displays it at the mains plug, the IEC connector, and on the flex cable jacket itself. Its absence on any of the three is the detail worth querying.
Choosing a cord from the inlet type alone. A C19 inlet on a UPS or PDU does not tell you how much current that unit draws. Check the equipment's actual rated draw and the manufacturer's instructions, then choose a cord assembly rated for it.
Reading a Cord's Label for Yourself
Most compliant cords print their key details directly on the cable jacket in a repeating strip of text. Look for:
- The manufacturer or brand name
- A reference to the applicable standard (for example, the relevant AS/NZS or IEC standard number)
- The voltage and current rating (for example, "250V 10A")
- The RCM mark, usually a small tick-in-a-triangle symbol
If any of this is missing, worn away, or looks inconsistent with what the connector shapes suggest, raise it with your supplier before using the cord.
How to Check Any Cord Yourself
This is the Regulatory Compliance Mark. Any compliant cord displays it on the mains plug, the IEC connector, and the flex cable itself.
- Look for the RCM mark on the mains plug, the IEC connector, and the flex cable jacket.
- Confirm the mains end rating (10A, 15A, etc.) against the wall circuit it will run from.
- Confirm the IEC connector matches the equipment's inlet type (C14 for C13, C20 for C19).
- Confirm the flex cable itself references AS/NZS 3191 or a recognised harmonised equivalent, not just the two connectors.
- If sourcing a new or unusual pairing, ask your supplier for test documentation covering all three components, not just the connector certifications.
- Check the equipment's input rating and the manufacturer's instructions, and confirm the complete cord assembly is rated for it, not just one end.
- Do not modify plug pins, bypass protective features, or use an adapter to overcome an incompatible supply connection.
For the full detail on what the RCM covers and the two regulatory schemes behind it, see our Product Compliance guide.
Need help selecting a cord? Contact Access Communications with the equipment model, input rating, connector details, and intended supply connection. We can help identify a suitable product and the documentation needed to confirm its application.
Frequently Asked Questions
Is it safe to use a power cord with different ratings on each end?
It depends on the complete cord assembly and the equipment it supplies. Where the plug is rated lower than the connector, such as a 10A mains plug with a C19 connector, the combination needs particular attention, because the plug's rating does not limit how much current the equipment draws. Check the equipment's input rating and the documentation for the exact cord.
Can a C19 connector be adapted to fit a C13/C14 device?
This is the pairing to avoid. These connector families are deliberately shaped so they cannot connect directly, and forcing them together with an adapter can result in poor contact, overheating, or fire.
How do I know if a power cord is genuinely compliant?
Look for the RCM mark on the mains plug, the IEC connector, and the flex cable itself. This confirms the cord meets Australian electrical safety, electromagnetic compatibility, and telecommunications standards across all three components.
What's the difference between AS/NZS 3112 and IEC 60320?
AS/NZS 3112 governs the mains plug and wall socket end, physical fit and safe current delivery from the wall. IEC 60320 governs the equipment connector end, the shape and rating of the coupler that plugs into a device. A single cord typically answers to both at once, one standard per end.
Does the flex cable itself need its own separate certification?
Yes. AS/NZS 3191 governs the flexible cord running between the mains plug and the equipment connector, separate from both connector standards. A cord can have fully compliant connectors on both ends and still be missing valid certification for the flex itself, this is one of the more common gaps suppliers overlook.
Why do some UPS units and PDUs use a C19 inlet?
Manufacturers often standardise on the C19/C20 connector across a whole product class because it suits that equipment category, which includes units that draw close to 16A. The inlet type alone does not tell you how much current a specific unit draws, so check its input rating and the manufacturer's instructions before choosing a cord.
Does a mismatched cord void a warranty or certification?
Different numbers on each end are not what decides it. What matters is whether all three components, the mains plug, the IEC connector, and the flex cable, hold valid test documentation and display the RCM mark, and whether the complete assembly is suitable for the equipment and the supply connection.
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