To ground devices like PCs and printers, the common and effective method is using the grounding that comes through the power plug and outlet. Specifically, for a PC:

• Plug the PC’s power supply into a grounded wall outlet (three-prong plug) but keep the socket switched off while working.
• Touch an unpainted metal part of the PC case or power supply unit (PSU) periodically to discharge static buildup on your body.
• Using an anti-static wrist strap connected to the grounded case or a grounded plug adapter is an additional precaution, especially on carpeted floors or in dry environments.
• If you don’t have an anti-static wrist strap, touching the metal parts of the plugged-in but switched-off PSU or case is usually sufficient to ground yourself.

For printers and other peripherals, grounding generally occurs through their power cords when plugged into a properly grounded outlet. If needed, additional grounding wires can be attached to metal parts connected to a grounded source such as a plumbing pipe or a grounding rod driven into the earth. In essence, proper grounding involves connecting the device enclosure to earth ground through the power outlet, and discharging any static electricity on your body by touching grounded metal surfaces before handling sensitive electronics.