Checked October 2, 2026 against the USB-IF "Cables and Connectors" page (usb.org/cable_connector). We have not bought, used or tested any cable for this guide; it is built only from that published page. It does not recommend a product.
A "240W" label alone can’t tell you whether a USB-C cable is right for fast data or a monitor. USB-IF says all cables do not have the same capabilities and that it certifies cables for different purposes. Fill in three blanks before you pay.
The three-blank worksheet
| Blank | What you write in | Where the answer comes from |
|---|---|---|
| 1. Charging | The wattage your charger and device actually need | Your device and charger specs; on a certified USB-C to USB-C cable, the 60W or 240W power marking |
| 2. Data | The data speed your drive, dock or device needs | Your device specs; on a certified cable (other than USB 2.0), the data-rate marking |
| 3. Video / display | The exact display connection your laptop and monitor use, and any cable condition the device maker states | The laptop and monitor makers’ own specs — not the wattage number |
1. Charging: what the 60W / 240W mark means
USB-IF says that, to pass its compliance program, all USB-C to USB-C cable categories must be labelled with a power capability of either 60W or 240W, using the appropriate power icon and/or logo. The marking is checked before compliance testing begins.
That number describes power. It is the answer to blank 1 — and only blank 1.
2. Data: why a power mark can appear without a speed mark
USB-IF’s rules add a second marking: in addition to the power marking, all certified cables except High-Speed USB (USB 2.0) USB-C to USB-C cables must be marked with the data rate they can support. USB-IF’s own example is a 20Gbps cable that supports 20V at 3A, which must carry the combined "20Gbps/60W" logo.
A High-Speed (USB 2.0) USB-C to USB-C cable is required to have the power icon, and can optionally add the USB 2.0 trident or a High-Speed logo.
Put those two rules together: under USB-IF’s program as published on October 2, 2026, a certified High-Speed (USB 2.0) USB-C to USB-C cable must carry a power mark but isn’t required to carry a data-rate mark (the USB 2.0 trident or High-Speed logo is optional). So when you need a specific data speed, look for a data-rate figure on the cable or its listing — a wattage figure on its own doesn’t fill blank 2.
Two limits on that reading:
- These are the requirements for passing the USB-IF compliance program. They describe certified cables; they don’t tell you anything about how an uncertified cable is labelled, and a missing mark is not proof that a cable is fake or unsafe.
- USB-IF also says captive cables — a cable with one USB connector that is permanently attached or has a non-USB connector on the other end — are not eligible for USB-IF certification.
3. Video: a cable can’t add what your devices don’t have
USB-IF says that using a certified cable does not augment the capabilities of the products it connects. In practice, that means a certified cable can’t add a display output that the laptop doesn’t have, or a mode the monitor doesn’t support.
So blank 3 starts with the devices, not the cable: check the laptop’s and monitor’s official specs for the exact display connection they use over USB-C and any cable requirement or length condition they state. Then check that the cable’s own listing says it supports that use. The wattage number answers none of this.
Why "the right cable" is your call
USB-IF puts it plainly: all cables do not have the same capabilities, USB-IF certifies cables for different purposes, and it is the end user’s responsibility to select a certified cable that has the capabilities needed for their own setup. That is what the three blanks are for.
Checklist before you pay
- Blank 1: What wattage does my charger and device need — and does the cable’s power mark cover it?
- Blank 2: What data speed do I need — and does the cable state a data rate, not just watts?
- Blank 3: What display connection do my laptop and monitor use over USB-C, and does the cable listing say it supports that?
- If the cable shows only a wattage: treat the data and video blanks as unanswered until the listing or maker answers them.
Certification rules change, so re-check USB-IF’s page and the product listing on the day you buy.
Source (read October 2, 2026): USB-IF, "Cables and Connectors" — https://usb.org/cable_connector