What safety precautions should I follow when plugging in my HP Z440 Workstation?

Plug the power cord into an AC outlet that is easily accessible, and disconnect power by unplugging the cord from the AC outlet rather than from the workstation itself. Always plug the cord into a grounded (earthed) three-pin outlet and do not disable the grounding pin, as it is an important safety feature. Note that an HP Z840 Workstation with a 1125W power supply may require more power than a typical office environment can supply. (Page 13)