Lenovo x3550 M4 Installation And Service Manual page 282

Important: Be sure to read the multilingual safety instructions on the CD that comes with
the server before you use the product.
264
System x3550 M4 Type 7914: Installation and Service Guide
CAUTION:
This product does not provide a power-control button. Turning off blades or
removing power modules and I/O modules does not turn off electrical current
to the product. The product also might have more than one power cord. To
remove all electrical current from the product, make sure that all power cords
are disconnected from the power source.
Statement 34
CAUTION:
To reduce the risk of electric shock or energy hazards:
v 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.
v 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).
v Incorporate a readily available approved and rated disconnect device in the
field wiring.
v See the specifications in the product documentation for the required
circuit-breaker rating for branch circuit overcurrent protection.
v Use copper wire conductors only. See the specifications in the product
documentation for the required wire size.
v See the specifications in the product documentation for the required torque
values for the wiring-terminal screws.
To remove a hot-swap dc power supply, complete the following steps: