HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 295)

EN
Service-call message 295
WARNING! Do not insert or unplug the power plug with wet hands; this could
result in electrical shock.
CAUTION Unplug the power cord using the appropriate end connector. Pulling
on the power cord itself may expose or snap the core wire, or cause
other damage to the power cord that could result in a fire or electrical
shock.
Leave sufficient space around the power plug so that it can be
unplugged easily in case of an emergency.