ASHRAE Journal - March 2015 - 76
COLUMN DATA CENTERS
TABLE 2 Summary data in probability for voltages greater than a threshold value (based on fitted lines).
TYPE OF DATA CENTER
500 VOLT DISCHARGE PROBABILITY
15% RH & 59°F
50% RH & 80°F
4,000 VOLT DISCHARGE PROBABILITY
8,000 VOLT DISCHARGE PROBABILITY
15% RH & 59°F
50% RH & 80°F
15% RH & 59°F
50% RH & 80°F
0.1%
3.2 × 10-8 %
No Static Control
18%
0.2%
0.5%
3.7 × 10-6 %
Dissipative Floors, Dissipative Footwear
16%
19%
0.016%
1.0 × 10-4 %
5.5 × 10-5 %,
2.2 × 10-7 %
Dissipative Floors, Uncontrolled Footwear
34%
5.65%
0.9%
0.001%
0.09%
2.3 × 10-5 %
Conductive Floors, Dissipative Footwear
0.003%
1.6 × 10-7 %
1.8 × 10-7 %
1.8 × 10-11 %
7.4 × 10-9 %
8.9 × 10-13 %
Conductive Floors, Uncontrolled Footwear
8%
0.1%
0.004%
4.7 × 10-10 %
4.1 × 10-5 %
7.5 × 10-13 %
Conductive Rubber Floors, Uncontrolled Footwear
0.1%
9.6 × 10-13 %
8.6 × 10-7 %
1.4 × 10-20 %
1.6 × 10-8 %
3.5 × 10-23 %
designed to withstand, especially if ESD precautions are
taken.
* Using ESD-mitigating flooring and footwear, the
risk of ESD upset and damage can be reduced to an
insignificant level, even if the humidity is allowed
to drop to low values, such as 8%. Unfortunately,
controlling the footwear in most data centers is very
impractical.
* All office chairs and carts selected for use in data
centers should have ESD-mitigating properties.
* Also grounding straps should be used when before
making contact to any of the sensitive electronics.
* A standard set of ESD-mitigation procedures listed
here will ensure a very low ESD incident rate at all humidity levels tested.
* For the new ASHRAE A3 and A4 environmental
classes, the authors conclude that there is a greater
chance for ESD events, but indicate that this can be
mitigated with proper data center design and good ESD
prevention with operating procedures. In general, the
www.info.hotims.com/54426-31
76
ASHRAE JOURNAL
ashrae.org
MARCH 2015
ASHRAE Journal - March 2015
Table of Contents for the Digital Edition of ASHRAE Journal - March 2015
Contents
ASHRAE Journal - March 2015 - Intro
ASHRAE Journal - March 2015 - Cover1
ASHRAE Journal - March 2015 - Cover2
ASHRAE Journal - March 2015 - 1
ASHRAE Journal - March 2015 - 2
ASHRAE Journal - March 2015 - Contents
ASHRAE Journal - March 2015 - 4
ASHRAE Journal - March 2015 - 5
ASHRAE Journal - March 2015 - 6
ASHRAE Journal - March 2015 - 7
ASHRAE Journal - March 2015 - 8
ASHRAE Journal - March 2015 - 9
ASHRAE Journal - March 2015 - 10
ASHRAE Journal - March 2015 - 11
ASHRAE Journal - March 2015 - 12
ASHRAE Journal - March 2015 - 13
ASHRAE Journal - March 2015 - 14
ASHRAE Journal - March 2015 - 15
ASHRAE Journal - March 2015 - 16
ASHRAE Journal - March 2015 - 17
ASHRAE Journal - March 2015 - 18
ASHRAE Journal - March 2015 - 19
ASHRAE Journal - March 2015 - 20
ASHRAE Journal - March 2015 - 21
ASHRAE Journal - March 2015 - 22
ASHRAE Journal - March 2015 - 23
ASHRAE Journal - March 2015 - 24
ASHRAE Journal - March 2015 - 25
ASHRAE Journal - March 2015 - 26
ASHRAE Journal - March 2015 - 27
ASHRAE Journal - March 2015 - 28
ASHRAE Journal - March 2015 - 29
ASHRAE Journal - March 2015 - 30
ASHRAE Journal - March 2015 - 31
ASHRAE Journal - March 2015 - 32
ASHRAE Journal - March 2015 - 33
ASHRAE Journal - March 2015 - 34
ASHRAE Journal - March 2015 - 35
ASHRAE Journal - March 2015 - 36
ASHRAE Journal - March 2015 - 37
ASHRAE Journal - March 2015 - 38
ASHRAE Journal - March 2015 - 39
ASHRAE Journal - March 2015 - 40
ASHRAE Journal - March 2015 - 41
ASHRAE Journal - March 2015 - 42
ASHRAE Journal - March 2015 - 43
ASHRAE Journal - March 2015 - 44
ASHRAE Journal - March 2015 - 45
ASHRAE Journal - March 2015 - 46
ASHRAE Journal - March 2015 - 47
ASHRAE Journal - March 2015 - 48
ASHRAE Journal - March 2015 - 49
ASHRAE Journal - March 2015 - 50
ASHRAE Journal - March 2015 - 51
ASHRAE Journal - March 2015 - 52
ASHRAE Journal - March 2015 - 53
ASHRAE Journal - March 2015 - 54
ASHRAE Journal - March 2015 - 55
ASHRAE Journal - March 2015 - 56
ASHRAE Journal - March 2015 - 57
ASHRAE Journal - March 2015 - 58
ASHRAE Journal - March 2015 - 59
ASHRAE Journal - March 2015 - 60
ASHRAE Journal - March 2015 - 61
ASHRAE Journal - March 2015 - 62
ASHRAE Journal - March 2015 - 63
ASHRAE Journal - March 2015 - 64
ASHRAE Journal - March 2015 - 65
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ASHRAE Journal - March 2015 - 69
ASHRAE Journal - March 2015 - 70
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ASHRAE Journal - March 2015 - 73
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ASHRAE Journal - March 2015 - 75
ASHRAE Journal - March 2015 - 76
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ASHRAE Journal - March 2015 - 86
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ASHRAE Journal - March 2015 - 95
ASHRAE Journal - March 2015 - 96
ASHRAE Journal - March 2015 - Cover3
ASHRAE Journal - March 2015 - Cover4
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