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Exin CDCS Exam - Topic 3 Question 25 Discussion

Actual exam question for Exin's CDCS exam
Question #: 25
Topic #: 3
[All CDCS Questions]

What is the minimum requirement for power feeds to a Rated-4 data center (ANSI/TIA-942)?

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Suggested Answer: B

A Rated-4 facility requires dual active utility feeds, each from an independent substation, but they may come from the same utility provider if substations are geographically separate and independent.

Option A is too strict; ANSI/TIA-942 does not mandate two different companies.

Options C and D do not provide true independence and would fail Rated-4 requirements.

Thus, the minimum is two substations, possibly same provider.


by Verdell at Mar 04, 2026, 01:19 AM

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Micah
3 days ago
Wait, is B really acceptable? That seems risky.
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Rory
8 days ago
Totally agree with A, redundancy is key!
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Jeff
13 days ago
A) Two feeds from two different substations, one power company not acceptable.
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Benedict
18 days ago
I’m leaning towards A as well, but I’m confused about whether having two feeds from one substation could ever be acceptable.
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Annamae
24 days ago
I practiced a similar question, and I feel like C is definitely not enough for a Rated-4 data center.
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Merilyn
29 days ago
I remember something about redundancy in power feeds, so maybe B is correct since it allows for one power company.
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Phuong
1 month ago
I think the answer is A, but I’m not entirely sure if it has to be from different substations.
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