50 HP BladeSystem p-Class Enclosure Installation Guide
Securing the scalable bus bars
Connecting the load-balancing signal cable
When a power zone is configured with two HP BladeSystem 3U Power
Enclosures, the load-balancing signal cable must be used to enable the power
enclosures to balance their power output for the system power demand in that
power zone.
IMPORTANT: If the load-balancing signal cable is not installed, the
management software issues alerts.