https://plus.google.com/+BensonLeung/posts/HakwCMmd346
Problem occurs when you connect a USB Type-C-enabled device such as a phone to a USB Type-A port on your laptop or hub. The USB Type-C phone may be specced for 3 amps of power, while the laptop's USB port, like most Type A chargers, can deliver only 2 amps or less. With a 56K Ohm resistor and the right components on board, a standards-compliant cable will make sure that the client tries to draw only as much electricity as the host can provide.
A poor-quality wire, however, fools the phone into thinking that it's connected to a 3-amp- capable power source. When the phone tries to draw 3 amps, it can cause permanent damage.