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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)?

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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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Filiberto
22 days ago
I thought B was acceptable too, but I guess not?
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Vanna
27 days ago
Totally agree with A, redundancy is key!
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Gracia
1 month ago
A) Two feeds from two different substations, one power company not acceptable.
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Han
1 month ago
I thought one feed split into two boards would work, but guess not!
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Ruthann
1 month ago
C is definitely not enough for a Rated-4 data center.
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Micah
2 months ago
Wait, is B really acceptable? That seems risky.
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Rory
2 months ago
Totally agree with A, redundancy is key!
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Jeff
2 months ago
A) Two feeds from two different substations, one power company not acceptable.
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Benedict
2 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
2 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
2 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
3 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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