HP ProCurve Planning And Implementation Manual page 22

Planning
Planning Your PoE Configuration
HP 600 RPS/EPS
HP ProCurve Switch
2626-PWR
Figure 3-2. Example of an HP 600 RPS/EPS Powering Two 2626_PWR Switches
3-4
Source of Watts
Power Available
Internal PoE 406
Power
Supply
204
External PoE
Power
Supply
(Failed
Internal PoE
Power
Supply)
When two switches are connected to the HP 600 RPS/EPS ports, the PoE
power available to each switch is a maximum of 204 W. If all of your PDs
consume on average less than 7.6 W each (allowing for any line loss) then
all 24 ports will receive redundant power should a switch's internal PoE
power supply fail.
Redundant power is available as long as the total power required remains
below 204 W.
# of Ports Powered and
Average Watts/Port
24 @ average 15.4 W each
Redundant # of Ports
Powered and Average Watts/
Port
24 @ 7.6 W each
12 @ 15.4 W each