v The rack/cabinet must provide adequate front-to-back ventilation.
For optimum ventilation, it is recommended the rack/cabinet not have a front door. If the rack/cabinet
has doors, the doors must be fully perforated so that there is proper front-to-back airflow to maintain the
required drawer ambient inlet temperature between 10 °C and 40 °C (50 °F and 104 °F), with an ideal
22 °C (72 °F), inside the rack. The perforations must yield 34% minimum open area per square inch.
General Safety Requirements for IBM Products Installed in a non-IBM
Rack/Cabinet
v Any product or component that plugs into either an IBM Power Distribution Unit (PDU) or main power
(via a power cord), or uses any voltage over 42 V ac or 60 V dc (considered to be hazardous voltage)
must be Safety Certified by a Nationally Recognized Test Laboratory (NRTL) for the country in which it
will be installed.
Some of the items that require safety certification may include: the rack/cabinet (if it contains electrical
components integral to the rack/cabinet), fan trays, PDU, uninterruptible power supplies (UPS),
multi-outlet strips, or any other products installed in the rack/cabinet that connect to hazardous voltage.
Examples of OSHA-approved NRTLs for the USA:
– UL
– ETL
– CSA (with CSA NRTL or CSA US mark)
Examples of approved NRTLs for Canada:
– UL (Ulc mark)
– ETL (ETLc mark)
– CSA
The European Union requires a CE mark and a Manufacturer’s Declaration of Conformity (DOC).
Certified products should have the NRTL logos or marks somewhere on the product or product label.
However, proof of certification must be made available to IBM upon request. Proof consists of such
items as copies of the NRTL license or certificate, a CB Certificate, a Letter of Authorization to apply the
NRTL mark, the first few pages of the NRTL certification report, Listing in an NRTL publication, or a
copy of the UL Yellow Card. Proof should contain the manufacturers name, product type and model,
standard to which it was certified, the NRTL name or logo, the NRTL file number or license number, and
a list of any Conditions of Acceptance or Deviations. A Manufacturer’s Declaration is not proof of
certification by an NRTL.
v The rack/cabinet must meet all electrical and mechanical safety legal requirements for the country in
which it is installed.
The rack/cabinet must be free of exposed hazards (such as voltages over 60 V dc or 42 V ac, energy
over 240 VA, sharp edges, mechanical pinch points, or hot surfaces).
v There must be an accessible and unambiguous disconnect device for each product in the rack,
including any PDU.
A disconnect device may consist of either the plug on the power cord (if the power cord is no longer
than 6 feet), the appliance inlet receptacle (if the power cord is of a detachable type), or a power on/off
switch, or an Emergency Power Off switch on the rack, provided all power is removed from the rack or
product by the disconnect device.
If the rack/cabinet has electrical components (such as fan trays or lights), the rack must have an
accessible and unambiguous disconnect device.
378 Site and Hardware Planning Information
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