Electric current from various cables and power sources can be hazardous and cause injury or equipment damage. To avoid this, disconnect all power cords, telecommunications systems, and networks before opening covers on servers or workstations, unless instructed otherwise. As an additional precaution, always disconnect all power by unplugging the power cord before performing any mechanical inspections, working near power supplies, or removing/installing main units. Never assume a circuit is safe - always double check it has been powered off. Be aware of potential electrical hazards like moist floors or non-grounded extension cables. If an accident occurs, switch off power and send for medical assistance.