Dell 3555-E3A, User Manual

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Gas and particulate exposure
Table 20. Gas and particulate exposure
Contamination Requirement
Gaseous contamination Severity level G1 as per ANSI/ISA 71.04-1985
1
, which states that the reactivity rate of
copper coupons shall be less than 300 Angstroms per month (Å/month, ≈ 0.0039
µg/cm
²
- hour weight gain)
2
. In addition, the reactivity rate of silver coupons shall be
less than 300 Å/month ( ≈ 0.0035 µg/cm ² - hour weight gain)
3
. The reactive monitoring
of gaseous corrosivity should be conducted approximately 5 cm (2 in.) in front of the
rack on the air inlet side at one-quarter and three-quarter frame height off the floor or
where the air velocity is much higher.
Particulate contamination Data centers must meet the cleanliness level of ISO 14644-1 class 8. For data centers
without airside economizer, the ISO 14644-1 class 8 cleanliness might be met by the
choice of the following filtration:
v The room air might be continuously filtered with MERV 8 filters.
v Air entering a data center might be filtered with MERV 11 or preferably MERV 13
filters.
For data centers with airside economizers, the choice of filters to achieve ISO class 8
cleanliness depends on the specific conditions present at that data center. The
deliquescent relative humidity of the particulate contamination should be more than
60% RH.3
4
.Data centers must be free of zinc whiskers
5
.
Notes:
1. ANSI/ISA-S71.04. 1985. Environmental conditions for process measurement and control systems: Airborne contaminants,
Instrument Society of America, Research Triangle Park, NC, 1985.
2.
The derivation of the equivalence between the rate of copper corrosion product thickness growth in Å/month
and the rate of weight gain assumes that Cu2S and Cu2O grow in equal proportions.
3. The derivation of the equivalence between the rate of silver corrosion product thickness growth in Å/month and
the rate of weight gain assumes that Ag2S is the only corrosion product.
4. The deliquescent relative humidity of particulate contamination is the relative humidity at which the dust
absorbs enough water to become wet and promote ionic conduction.
5. Surface debris is randomly collected from 10 areas of the data center on a 1.5 cm diameter disk of sticky
electrically conductive tape on a metal stub. If examination of the sticky tape in a scanning electron microscope
reveals no zinc whiskers, the data center is considered free of zinc whiskers.
Power cords
To avoid electrical shock, a power cord with a grounded attachment plug is provided. Use
only properly grounded outlets.
Table 21 on page 26 lists the power cord part number, feature code, the country, or region
where the power cord is used, and the plug's standard reference. The last column in the
table contains an index number that you can match to a specific receptacle type in Figure 23
on page 30.
All power cords use an appliance coupler that complies with the International
Electrotechnical Commission (IEC) Standard 320, Sheet C13.
If the power cord that you receive does not match your receptacle, contact your local dealer.
Power cords that are used in the United States and Canada are listed by Underwriter's
Laboratories (UL), are certified by the Canadian Standards Association (CSA), and comply
with the plug standards of the National Electrical Manufacturers Association (NEMA). For
other worldwide geographies, plug standards are listed in Table 21 on page 26.
Planning
25