Appendix E
DC Power Supply
DC Power Supply Considerations
176
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 E-1.
Figure E-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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