Welch Allyn OAE Hearing Screener - User Manual - Manual (Page 48)

Welch Allyn OAE Hearing Screener Directions for Use 705353 Rev F 47
Electrical Installation Requirements
The following requirements are necessary only when using the Welch Allyn OAE Hearing
Screener in an AC-powered configuration. Grounding is not necessary in normal battery-powered
use.
Grounding Requirements
The desired installation site must have a grounding wire for electrically connecting the
system equipment to a properly grounded terminal (Earth). The grounded terminal shall
be connected to the steel skeleton or under the main reinforcing steel with any multiple
grounding wires grounded at the same point. (One point grounding) The shield room or
bed must also be grounded at the same grounding terminal as the installation site.
Power Plug Requirements
Use only the following power plug configurations.
•
A 3-pin power plug requires a 3-pin wall socket with a properly installed grounding
pole. Verify the wall receptacle is correctly grounded before inserting the 3-pin
power plug.
• A 2-pin/3-pin adapter for connecting 3-pin power supply plugs to a 2-pin wall socket.
The grounding terminal on the adapter must be fixed with the free end secured to
the ground terminal.
• A 2-pin power plug with a grounding terminal for a 2-pin wall socket. The grounding
terminal on the power plug must be secured to the ground terminal.
Types of Hospital Facility Groundings
Use the following information to verify the installation site has the appropriate
grounding.
Grounding Resistance The ground resistance of grounding poles
connected to medical equipment must be 10
ohms or less.
Protective Grounding
Protective grounding must be provided for
patient safety to let the leak current flow into the ground.
Functional Grounding
This type of grounding is not a requirement for
patient safety, but will help to eliminate hums.
Hazards of Improper Electrical Installations
Improper electrical installation can cause electrical shock to either the patient or user. It
can also damage system equipment under a fault condition.