Passive USB-C cables support up to 60W, anything higher needs more expensive cables with e-Marker chips on both ends, which are actually ARM32 MCUs that will tell both sides their capabilities and negotiate power. So the power source, sink and cable are all involved in a 3-way dance. If you want to learn more, I'd suggest following Benson Leung, a member of the Google Chromebook team who started a one-man charge against shoddy USB-C cables and chargers after a defective one burnt his laptop. https://www.reddit.com/user/LaughingMan11/ You could also splurge on a USB-C tester like those made by ChargerLab.