NEC MH4500 - Manual (Page 31)

Setting Up Your System 2-11
Equipment Rack Warnings and Cautions
Observe and implement the following equipment rack warnings and cautions
before starting the conversion.
!
WARNING
Anchor the Equipment Rack. The equipment rack must be
anchored to an unmovable support to prevent it from falling
over when one or more servers are extended in front of it on
slide assemblies. The anchors must be able to withstand a
force of up to 113 kg (250 lbs). You must also consider the
weight of any other device installed in the rack.
Main AC Power Disconnect. You are responsible for
installing an AC power disconnect for the entire rack unit.
This main disconnect must be readily accessible, and it must
be labeled as controlling power to the entire unit, not just to
the server(s).
Grounding the Rack Installation. To avoid a potential
electrical shock hazard, you must include a third wire safety
grounding conductor with the rack installation. If server
power cords are plugged into AC outlets that are part of the
rack, then you must provide proper grounding for the rack
itself. If server power cords are plugged into wall AC outlets,
the safety grounding conductor in each power cord provides
proper grounding only for the server. You must provide
additional, proper grounding for the rack and other devices
installed in it.
Overcurrent Protection. The server is designed for an AC
line voltage source with up to 20 amperes of overcurrent
protection. If the power system for the equipment rack is
installed on a branch circuit with more than 20 amperes of
protection, you must provide supplemental protection for the
server. If more than one server is installed in the rack, the
power source for each server must be from a separate
branch circuit. The overall current rating of a server
configured with three power supplies is under 12 amperes.
!
CAUTION
Temperature. The operating temperature of the server,
when installed in an equipment rack, must not go below 5 °C
(41 °F) or rise above 35 °C (95 °F). Extreme fluctuations in
temperature can cause a variety of problems in your server.
Ventilation. The equipment rack must provide sufficient
airflow to the front of the server to maintain proper cooling. It
must also include ventilation sufficient to exhaust a
maximum of 4,100 Btu's per hour for the server. The rack
selected and the ventilation provided must be suitable to the
environment in which the server is used.