How to tell whether a USB-C cable can carry high-wattage power and Thunderbolt 3 data

This many years into USB-C and Thunderbolt 3, it can still be confusing as what carries what.

usb c cable orange

A USB C connector and cable on show at Computex 2015 in Taipei.

Agam Shah/IDG

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Glenn Fleishman is the author of dozens of books. His most recent include Take Control of Your M-Series Mac, Take Control of Securing Your Mac, Take Control of Zoom, and Six Centuries of Type and Printing. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.
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