Appendix B
DC Power Supply
DC Power Supply Considerations
78
DC Power Supply Considerations
There are a few things to consider when connecting your workstation(s) to a DC power source. First
you need to have the proper gauge of wire available to make the connection from the DC power
source to the workstation(s). Second you need to ensure that your workstation or workstations are
properly grounded. Finally, you need to consider where to locate your workstation(s) and their DC
power source.
WARNING Disconnect power from the source before connecting power to the product
or before accessing the product’s power terminals. The DC source can supply
high levels of current capable of causing serious burns and arcing that can
produce molten metal.
Connecting Wires
The wires used to make all grounding and electrical connections to your workstation(s) should be a
minimum of 18 AWG. Note that the electrical-power connectors to the workstation(s) must use
insulated crimp-on lugs. This will prevent the connectors from shorting to the chassis.
Grounding Your Workstation
A separate wire is required to properly connect the chassis to earth. This is needed for safety as well
as for Electromagnetic Compatibility (EMC). See Figure B-1.
Figure B-1 Physical Ground Connection
Location for Your DC Source and Workstation(s)
The DC power source and workstation(s) that use this DC source should be installed in a location
that provides for restricted access. Restricted access means providing locked security and allowing
access only by service personnel.
Earth
Ground
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