Power Distribution with the Circuit Breaker Panel
Note: The -48 V DC Model S00 rack must be connected to a -48 V DC supply
source which is electrically isolated from its AC power source. The -48 V DC
power source must also be reliably grounded.
In general, the power distribution and grounding strategies for a -48 V DC Model S00
rack equipped with a circuit breaker panel is similar to a rack equipped with a power
distribution panel. Basically, the circuit breaker panels accept power from up to two
customer power sources and distribute parallel power feeds to each device in the
rack. Device power cables from a 15A circuit breaker panel are typically connected
first to the terminal strips in the circuit breaker panel chassis, and then from the
terminal strips to the devices.
The exact configuration of power distribution in a Model S00 rack with a circuit
breaker panel depends on the particular configuration of drawers installed in the
rack. The diagram below shows a general example of power distribution for a
standalone Model S00 rack containing a CPU enclosure. When servicing the power
distribution system in a -48 V DC Model S00 rack, take care to determine the exact
configuration being used prior to servicing. Refer to the service guide for the system
or devices in your rack for more information.
Chapter 1. Reference Information 1-15
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