GE Medical Systems marquette Dash 2000, Service Manual, Page: 34 / 202

EQUIPMENT OVERVIEW: Preparation for Use
2-12 DASH 2000 Patient Monitor Revision A
2000 412-001
Preparation for Use
Power Requirements At least one grounded duplex wall receptacle should be provided for each
monitor. The wall receptacle should be hospital grade and installed in a
suitable junction box. Power should be provided by a power line
dedicated solely to equipment requiring emergency power.
WARNING
Depending on battery charge, loss of power to the monitor
results in the loss of all monitoring functions.
Equipment Ground
Requirements
The ground pin of the wall receptacles and all exposed metal parts (beds,
radiators, water pipes, etc.) in the patient area should be connected
together and tied to the nearest equipotential ground point through a
bonded grounding system, or with a 10-AWG stranded copper grounding
cable. This equipotential ground point should be as close to earth ground
as possible. Use only three-prong, polarized, hospital-grade wall
receptacles to accept the three-wire, polarized plug on the power cord of
the monitor.
If a bonded grounding unit is not available, interconnect the ground pins
of all wall receptacles in the patient and monitor areas with 10-AWG (or
larger) stranded copper cables. This copper cable must connect to the
central grounding point. Do not jumper from ground pin to ground pin,
then to the central grounding point. The ground cabling must not carry
current, such as a grounded neutral, since the current flow will produce
differences in potential along the ground. These potential differences are
the main source for shock hazards to the users and patients.
Do not rely on conduit as a ground conductor. Plastic (PVC) pipes or
fittings used as conduit break up the ground path, which can present
potential shock hazards. The electrical ground system must be connected
to actual earth ground. If this is not possible, then a good reference
ground such as a metal cold water pipe or an electrically conductive
building component should be used. It is more important that all
grounded objects in the patient area are at the same potential than at
true earth potential.