When you have a generic usb power adapter you ll need a us to micro usb cable to connect that power to your raspberry pi.
Pi power cable.
You also may have an official raspberry pi power supply but need extra length in the wire use our 4m micro usb extension cables to give you much more reach and flexibility.
This technology uses a standard ethernet cable to send power to a special add on board fitted to a raspberry pi.
It has the added benefit of connecting a pi to the internet at the same time using special injectors.
If the cable you planned on using to power your pi 4 does not work using a usb c phone charger or an older charger with a type c adapter is suggested as they are less likely to use e marker chips.
If you are using a hub that backfeeds to the raspberry pi and the hub experiences a power surge your raspberry pi could potentially be damaged.
This means that the hubs will power the raspberry pi through its usb cable input cable without the need for a separate micro usb power cable and bypass the voltage protection.
A good way to power a raspberry pi in an awkward location is to use power over ethernet poe.