1200-Watt AC-Input Power Supply Replacement Instructions 11
Installation Safety, ESD Precautions, and Tools Required
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, which can occur when electronic boards or components are
handled improperly, can result in complete or intermittent failures.
Following are guidelines for preventing ESD damage:
•
Always use an ESD-preventive wrist strap or ankle strap and ensure that it makes good skin
contact.
•
When removing or installing a power supply, connect the equipment end of a ground strap to the
chassis ground screw on the interface processor end of the chassis, or to an unpainted surface
inside the noninterface processor end of the chassis, such as the chassis frame.
•
If you are returning a replaced part to the factory, immediately place it in a static shielding bag
to avoid ESD damage to the board.
•
The wrist strap only protects the board from ESD voltages on the body; ESD voltages on clothing
can still cause damage.
Warning
For safety, periodically check the resistance value of the antistatic strap. The
measurement should be between 1 and 10 megohms.
Tools Required
You need the following tools to install or replace a power supply:
•
A 1/4-inch flat-blade and Number 2 Phillips screwdriver.
•
Small, wire cutter.
•
If the chassis is mounted in an equipment rack, and cables from other equipment fall in front of
the power supply bays, you will need cable ties to temporarily anchor the cables out of the way.
•
If access to the power supply bays is partially blocked by a power strip or other permanent rack
fixture, you will need a 1/4-inch flat-blade screwdriver to temporarily detach the ears from the
equipment rack mounting strips.
•
ESD-preventive wrist strap.
Before beginning the power supply installation, check the installation screws on all power supplies
and check the area around the power supply bays to determine which tools you will need.
The new or replacement power supply and the power cable that you supply are the only parts you
need to complete this installation.
If you remove a power supply and leave the bay empty, install a cover plate over the empty bay. The
chassis is shipped with a cover plate installed over the empty bay.
Circuit Protection Requirements
Based on the NFPA 70 National Electrical Code, you should use a 35A overcurrent protector to meet
the requirement for the overcurrent protector size of 125 percent of the load current, which is
approximately 27A. An overcurrent protector rated for 30A can be used only if it has been listed by
the safety agency for operation at 100 percent of its rating.
