in GR-1089-CORE, Issue 4) and require isolation from the exposed OSP cabling. The
addition of Primary Protectors is not sufficient protection in order to connect these
interfaces metallically to OSP wiring.
Warning: Before testing -48VDC power source:
• Ensure that no power is being provided to the system from the –48VDC power source,
such as a power board
• Ensure that no circuit cards are installed in the shelves
• Open all circuit breakers in the PDP
• Recheck wiring and connections for proper polarity
Warning: Always install an isolator pad between the frame and ground. Frames are
shipped with isolator pads to completely isolate the frames from ground.
Warning: Application servers. Verify that all breakers are set to the OFF (O) position.
An application server chassis is redundantly powered from both A and B -48VDC buses.
Ensure that both the circuit breaker supplying A power to the chassis and the circuit
breaker supplying B power to the chassis are turned OFF by measuring the voltage with
a VOM on the cable that connects the chassis to its breakers. Both A and B power LEDs
on the front panel of the chassis should be OFF.
Caution: Redundant systems allow service during normal maintenance. When repairs
require a total power disconnect, both input supply sources must be disconnected. This
causes service interruption and takes down the systems.
Caution: This equipment has a connection between the earthed conductor of the DC
supply circuit and the earthing conductor.
Caution: Install equipment in restricted access areas in accordance with articles 110-16,
110-17, and 110-18 of the National Electric Code, ANSI/NFPA 70.
Caution: Incorporate a readily accessible approved disconnect device in the field wiring.
Caution: Use only listed closed-loop connectors for connection to the power supply.
22
910-5680-001 Revision F, February 2014
Safety and Pre-Installation Requirements
Platform Maintenance
