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Exin CDCS Exam - Topic 3 Question 28 Discussion

Posted by Raylene on May 04, 2026 at 04:18 AM

The humidity in the computer room has changed from about 50% down to 35% Relative Humidity (RH).

What influence does this have on Electrostatic Discharge (ESD)?

Suggested Answer: C

As relative humidity decreases, Electrostatic Discharge (ESD) risks increase. Lower humidity levels reduce the amount of moisture in the air, which normally helps dissipate static charges. When the humidity drops from 50% to 35%, the likelihood of static electricity accumulating on surfaces rises, leading to a higher potential for ESD incidents that could damage sensitive IT equipment.

Detailed Explanation:

ESD events are more common in dry environments because there is less atmospheric moisture to neutralize electrical charges. Maintaining relative humidity above 40% helps minimize the risk of ESD, which is why data centers often control humidity levels tightly to protect equipment from static discharge that could cause hardware failures or data loss.

EPI Data Center Specialist Reference:

EPI data center best practices stress the importance of maintaining stable humidity levels to prevent ESD, particularly in computer rooms. Recommended humidity ranges are typically above 40% to prevent conditions that would foster static buildup.


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26 comments · newest first
GE
Gearldine
I think ESD levels will go up. Lower humidity means more static.
NI
Nichelle 5 days ago
Right? ESD is a real concern in low humidity.
MA
Mabel 10 days ago
I’m surprised some think it has no influence at all.
KA
Kallie 15 days ago
Exactly! Static builds up more in dry conditions.
TI
Tina 20 days ago
Option D seems wrong. Lower humidity should raise ESD.
FI
Filiberto 26 days ago
I feel like humidity really matters for ESD.
CH
Chau 1 month ago
I’m leaning towards option C too. It makes sense.
AR
Arlette 1 month ago
Agreed! Dry air increases ESD risk.
MI
Mignon 1 month ago
I think ESD levels will go up. Lower humidity means more static.
EL
Elena 2 months ago
C is the best choice. We need to be careful!
LU
Luis 2 months ago
D could be possible, but I doubt it.
BR
Brynn 2 months ago
B seems wrong. Humidity definitely affects ESD.
FE
Felix 2 months ago
I’d go with C. More static in dry conditions.
KI
King 2 months ago
No, humidity matters. 35% is too low.
SH
Sheridan 2 months ago
I’m not sure. Isn’t it stable at 20C?
JA
Jacqueline 3 months ago
Agreed! Dry air increases ESD risk.
RO
Rodolfo 3 months ago
I think ESD levels will go up. Lower humidity means more static.
YA
Yaeko 3 months ago
D) ESD levels will definitely go down at 35% RH.
TI
Tiffiny 3 months ago
A) No influence is just wrong, come on!
ST
Stephaine 3 months ago
Wait, really? I thought humidity didn't matter much.
NA
Na 3 months ago
Totally agree, lower humidity means more static!
HA
Haydee 4 months ago
ESD levels will go up with lower humidity.
DA
Daniela 4 months ago
I thought humidity didn't matter much as long as the temperature is stable, so A could be a possibility too.
TA
Tamie 5 months ago
I practiced a similar question, and I think the answer is C because dry air can lead to more static buildup.
GE
German 6 months ago
I’m not entirely sure, but I feel like humidity does play a role in ESD. Maybe D is correct?
CH
Chaya 6 months ago
I remember studying that lower humidity can increase ESD risk, so I think C might be the right answer.
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