User guide

Rack information C–15
Hitachi Unified Storage VM Block Module Hardware User Guide
• If working near a hazardously energized part, do not work alone. Work
with another person who can immediately turn off the power in an
emergency.
• Do not wear any metallic item such as a wristwatch with a metallic
surface or metallic accessories. If you wear eyeglasses with a metallic
frame, do not allow the frame to touch an uninsulated surface.
• Be sure your hands and arms are dry.
• Unless otherwise specifically instructed, use only one hand when it is
necessary to work near an exposed live electric circuit. This prevents the
completion of the circuit through both hands even if you accidentally
touch the circuit.
• Do not use a dental mirror near an exposed live electric circuit. The
mirror surface is conductive and can become hazardous even if it is
made of plastic.
• Unless otherwise specifically instructed, do not supply power to any
subassembly such as a power supply unit or a motor while it is removed
from its main product.
Precautions when using rack-mounted equipment
This section explains precautions for:
• Casters — see Casters on page C-15
• Rack stability — see Rack stability on page C-15
• Component weight and location — see Component weight and location
on page C-16
• Height considerations — see Height considerations on page C-17
• Placing components in the rack — see Placing components in the rack on
page C-18
• Working with racks or components — see Working with racks or
components in the rack on page C-18
• Air vents and airflow — see Air vents and airflow on page C-18
• Blanking panels — see Blanking panels on page C-19
• Cable Guidelines — see Cable guidelines on page C-19
Casters
Hitachi racks have casters that enable the rack to be rolled across short
distances to position it for final installation. Although the casters can
support the weight of the rack with installed components, they are not
designed to support the full weight of the rack on a long-term basis. As soon
as the rack is in its final position, adjust the leveling feet so that they
support the full weight of the rack. Otherwise, the casters may be damaged.
Rack stability
To reduce the risk of injury to persons or equipment, follow these
guidelines: