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Magnum XS 450 Power System –48 VDC User’s Manual Page 18
Hooking the load cables to a module used as a battery return will cause erroneous battery
current readings.
The dc load cable(s) should be sized to limit the voltage drop from the Magnum XS 450
Power System to the loads per system design requirements. The cable(s) must also carry
the full load current during battery operation. During battery operation the voltage will be
lower and for constant power loads the current will typically be higher. If assistance is
required to determine the necessary cables for the application, contact your sales
representative or APC.
3.7 DC Distribution Installation
WARNING
: Hazardous energy levels are present on bare conductors in the -48
Vdc distribution connection area of the plant. Accidental shorting of distribution
conductors can cause arcing and high currents that can cause serious burns or
other physical harm. It is recommended that:
• Remove any jewelry, rings or watches while working on this equipment.
• Use insulated wrenches, screwdrivers, cutters, pliers and other tools.
Circuit Breaker Installation
Figure 3.7-1 Merlin Gerin Circuit Breaker
WARNING: The circuit breakers (CBs) should be in the OFF position
prior to installation in the system.