Lenovo System x3850 X6 Installation And Service Manual page 119

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.
Note: These instructions apply to both the 4-socket and 8-socket servers.
To install a 750-watt -48 V to -60 V dc power supply, complete the following steps:
Note: Only trained service technicians, other than Lenovo approved service technicians, are authorized to
install and remove the 750-watt -48 V to -60 V dc power supply, and make connections to or disconnections
from the 750-watt -48 V to -60 V dc power source. Lenovo approved service technicians are not certified or
authorized to install or remove the 750-watt -48 V to -60 V dc power cable. You are responsible for ensuring
that only a trained service technician install or remove the 750-watt -48 V to -60 V dc power cable.
Step 1. Before you begin, read the notes at the beginning of this section, "Safety" on page v, and
"Installation guidelines" on page 44.
Step 2. Turn off the server (see "Turning off the server" on page 40) and all attached peripheral devices.
Disconnect all external cables from the server.
Attention: When you handle static-sensitive devices, take precautions to avoid damage from
static electricity. For details about handling these devices, see "Handling static-sensitive devices"
on page 46.
Step 3. Turn off the circuit breaker(s) for the dc power supplies.
Note: Make sure that you use a circuit breaker that is rated 40 amps.
Step 4. Remove the power-supply filler panel from the power-supply bay where you are installing the
power supply. Save the filler for later use.
Step 5. Touch the static-protective package that contains the 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.
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Chapter 2 Installing optional devices
105