Lenovo System x3550 M4 Installation And Service Manual page 87

Statement 34
CAUTION:
To reduce the risk of electric shock or energy hazards:
• This equipment must be installed by trained service personnel in a restricted-access location,
as defined by the NEC and IEC 60950-1, First Edition, The Standard for Safety of Information
Technology Equipment.
• Connect the equipment to a properly grounded safety extra low voltage (SELV) source. A SELV
source is a secondary circuit that is designed so that normal and single fault conditions do not
cause the voltages to exceed a safe level (60 V direct current).
• Incorporate a readily available approved and rated disconnect device in the field wiring.
• See the specifications in the product documentation for the required circuit-breaker rating for
branch circuit overcurrent protection.
• Use copper wire conductors only. See the specifications in the product documentation for the
required wire size.
• See the specifications in the product documentation for the required torque values for the
wiring-terminal screws.
Important: Be sure to read the multilingual safety instructions on the CD that comes with the server
before you use the product.
Installing a hot-swap dc power supply
To install a hot-swap dc power supply, complete the following steps.
Attention: Only trained service personnel other than Lenovo service technicians are authorized to install
and remove the -48 volt dc power supply, and make the connections to and disconnections from the -48
volt dc power source. Lenovo service technicians are not certified or authorized to install or remove the
-48 volt power cable. The customer is responsible for ensuring that only trained service personnel install or
remove the -48 volt power cable.
Step 1. Read the safety information that begins on "Safety" on page v and "Installation guidelines"
on page 31.
Step 2. Touch the static-protective package that contains the hot-swap power supply to any unpainted
metal surface on the server; then, remove the power supply from the package and place it on
a static-protective surface.
Step 3. Turn off the circuit breaker for the dc power source to which the new power supply will be
connected. Disconnect the power cord from the dc power source.
.
Chapter 2 Installing optional devices
73