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Exin CDCS Exam - Topic 3 Question 25 Discussion

What is the minimum requirement for power feeds to a Rated-4 data center (ANSI/TIA-942)?
B) Two feeds from two different substations, one power company acceptable
A) Two feeds from two different substations, one power company not acceptable
C) Two feeds from one substation
D) One feed split into two distribution boards

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)?

Show Suggested Answer Hide Answer
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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Georgiana
2 days ago
B could work too, but I prefer A for safety.
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Elizabeth
7 days ago
I agree, A makes sense. Can't risk power from one source.
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Robt
12 days ago
I think it's A. Two feeds from different substations are crucial for redundancy.
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Kimberlie
17 days ago
C is definitely not enough for a Rated-4 data center!
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Mari
22 days ago
Wait, really? One power company isn't enough?
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Filiberto
2 months ago
I thought B was acceptable too, but I guess not?
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Vanna
2 months ago
Totally agree with A, redundancy is key!
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Gracia
3 months ago
A) Two feeds from two different substations, one power company not acceptable.
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Han
3 months ago
I thought one feed split into two boards would work, but guess not!
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Ruthann
3 months ago
C is definitely not enough for a Rated-4 data center.
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Micah
3 months ago
Wait, is B really acceptable? That seems risky.
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Rory
3 months ago
Totally agree with A, redundancy is key!
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Jeff
3 months ago
A) Two feeds from two different substations, one power company not acceptable.
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Benedict
4 months 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
4 months 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
4 months 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
4 months 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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