Computer desks must conduct electricity to the ground and be grounded, in order for the user not to endure an electric shock; the floor must also be grounded, and this applies to other furniture holding electrical appliances.
Si es necesario proteger todos los dispositivos electrónicos con protección a tierra y en las tomas de las casas y oficinas por eso las tomas tienen tres orificios y los cables de alimentación de los equipos traen tres elementos
"Grounding it's done for safety in case current leaks out the power supply IF it's broken and it passes the current to case then the case itself becomes dangerous if you touch it. If you have grounding the current will go to the ground instead of you."