HP ProCurve 2520 Planning And Implementation Manual page 151

In this configuration, EPS 2 of the Power Supply Shelf can be connected to
either EPS 1 or EPS 2 of either switch.
To Power
To Power
Source Source
5412zl
EPS 2
Figure 10-22.Connecting the EPS to two switches, one 5412zl and one 8212zl
Planning and Implementation for the 5400zl/8200zl Switches
To Power
To Power
Source
Source
EPS 2
EPS Cables
Configuration Examples
To Power Source
EPS 1
EPS 1
8212zl
10-31