ASHRAE Journal - March 2015 - 77

COLUMN DATA CENTERS

increased risk in migrating from 25% RH to 8% RH is
about a 50% increase in the incidence of ESD risk.

Closing Comments
Lower relative humidity generally increases both
the frequency and magnitude of ESD discharges.
Whether these increases actually increase the risk
damaging ESD events, however, is
quite interdependent with other
variables in the data center, such
as floor conductance and operating
procedures.
There are many industry "best
practices" and risk mitigation methods that could be used to avoid damaging ESD on sensitive electronics.
Oftentimes, these mitigation methods can be hard to implement and
enforce, but especially in light of the
data collected in this project, they
are proven means to reducing the
risks associated with ESD.
The new ESD research has helped
to quantify the ESD risks associated
with lower level humidity levels in
the data center, and has concurrently shown other approaches to
mitigating damage to IT equipment
from ESD events. This research provides guidance for the operation of
data centers in the new ASHRAE A3
and A4 environmental conditions.
It also provides an excellent set of
technical data that could form the
basis for adjustments to ASHRAE's
recommended and allowable environmental ranges for IT equipment
in the future.

included three more papers, CH-15-005, CH-15-006,
and CH-15-007. These papers can be obtained from the
ASHRAE Bookstore.

References
1. IEC 6100-4-2 Electromagnetic Compatibility (EMC) - Part 4-2:
Testing and measurement techniques - Electrostatic discharge immunity test.

For More Information
For those interested in the details
of this study, the RP-1499 research
project has spawned a wealth of
Technical Papers, as well as a final
report. An initial paper (DE-13-031)
was published in 2013. The recent
2015 Winter Conference in Chicago
www.info.hotims.com/54426-38
MARCH 2015

ashrae.org

ASHRAE JOURNAL

77



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
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ASHRAE Journal - March 2015 - 11
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ASHRAE Journal - March 2015 - 13
ASHRAE Journal - March 2015 - 14
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ASHRAE Journal - March 2015 - Cover3
ASHRAE Journal - March 2015 - Cover4
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