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Wiring a 48 V DC Electrical Connector Block
• There must be an earth ground connection to the chassis that you are installing the replacement module.
• We recommend 8-AWG wire for DC installation in the U.S.
• All DC power supplies have reverse polarity protection. When you inadvertently connect the input power
Step 1
Holding the replacement power supply with one hand underneath the module and the other hand holding the handle, turn
the power supply so that its release latch is on the right side and align the back end of the power supply (the end with the
electrical connections) to the open power supply slot before carefully sliding the power supply all the way into the slot
until it clicks into place.
If the power supply does not fit into the open slot, turn the module over before carefully sliding it into the open
Note
slot.
Step 2
If the DC power cables and a grounding cable are already connected to an electrical connector block, insert the block
into the power receptacle on the power supply.
If the electrical cables have not been connected to the electrical connector block, wire them as described in
V DC Electrical Connector Block, on page
Step 3
Turn on the circuit breaker for the DC power source connected to the power supply.
Step 4
Verify that the power supply is operational by making sure that the power supply
what the power supply LEDs indicate, see
Wiring a 48 V DC Electrical Connector Block
You must connect the ground, negative, and positive DC power cables to a connector block in order to connect
the power cables to a 48 V DC power supply.
Note
The recommended wire gauge is 8 AWG. The minimum wire gauge is 10 AWG.
Warning
<!--rcsi-show-stmt-number-->Statement 342 Before Connecting to System Power Supply
High touch/leakage current – Permanently connected protective earth ground is essential before connecting
to system power supply.
Warning
Statement 1024 Ground Conductor
This equipment must be grounded. To reduce the risk of electric shock, never defeat the ground conductor or
operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical
inspection authority or an electrician if you are uncertain that suitable grounding is available.
Cisco Nexus 9272Q NX-OS Mode Switch Hardware Installation Guide
40
Typically, the chassis is grounded by its metal-to-metal connection to a grounded rack. If you need to
ground this chassis by another means, see
(+) to the DC PSU's – terminal and the input power – to the DC PSU's (+) terminal, the PSU will not
be damaged and will operate fine after the input power feeds are correctly wired.
40.
Power Supply LEDs, on page
Grounding the Chassis, on page
LED is green. For information on
56.
Replacing Modules
24.
Wiring a 48
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