Lenovo System x3550 M4 Installation And Service Manual page 262

Figure 167. Power supply removal
If you are instructed to return the power supply, follow all packaging instructions, and use any packaging
materials for shipping that are supplied to you.
Removing a hot-swap dc power supply
Use this information to remove a hot-swap dc power supply.
When you remove or install a hot-swap dc power supply, observe the following precautions.
Statement 29
CAUTION: This equipment is designed to permit the connection of the earthed conductor of the dc supply
circuit to the earthing conductor at the equipment.
This equipment is designed to permit the connection of the earthed conductor of the dc supply circuit to the
earthing conductor at the equipment. If this connection is made, all of the following conditions must be met:
• This equipment shall be connected directly to the dc supply system earthing electrode conductor or to a
bonding jumper from an earthing terminal bar or bus to which the dc supply system earthing electrode
conductor is connected.
• This equipment shall be located in the same immediate area (such as, adjacent cabinets) as any other
equipment that has a connection between the earthed conductor of the same dc supply circuit and the
earthing conductor, and also the point of earthing of the dc system. The dc system shall not be earthed
elsewhere.
• The dc supply source shall be located within the same premises as this equipment.
• Switching or disconnecting devices shall not be in the earthed circuit conductor between the dc source
and the point of connection of the earthing electrode conductor.
Statement 31
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Lenovo System x3550 M4 Installation and Service Guide