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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)?

ATwo feeds from two different substations, one power company not acceptable

BTwo feeds from two different substations, one power company acceptable

CTwo feeds from one substation

DOne feed split into two distribution boards

Show Suggested 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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Cassie

5 hours ago

D is risky. One feed isn't enough for a Rated-4 center.

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Antonette

5 days ago

B could work too, but I prefer A for safety.

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Salena

11 days ago

I agree, A makes sense. Can't rely on just one power source.

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Mozelle

16 days ago

I think it's A. Two feeds from different substations are crucial for redundancy.

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Joana

21 days ago

C is risky, not enough backup.

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Sherita

26 days ago

B could work too, but not ideal.

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Kenny

1 month ago

I agree, A makes sense for redundancy.

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Leonida

1 month ago

I think it's A. Two feeds from different substations is crucial.

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Quentin

1 month ago

C is too risky. We need A for a Rated-4 center.

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Georgiana

2 months ago

B could work too, but I prefer A for safety.

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Elizabeth

2 months ago

I agree, A makes sense. Can't risk power from one source.

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Robt

2 months ago

I think it's A. Two feeds from different substations are crucial for redundancy.

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Kimberlie

2 months ago

C is definitely not enough for a Rated-4 data center!

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Mari

2 months ago

Wait, really? One power company isn't enough?

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Filiberto

4 months ago

I thought B was acceptable too, but I guess not?

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Vanna

4 months ago

Totally agree with A, redundancy is key!

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Gracia

4 months ago

A) Two feeds from two different substations, one power company not acceptable.

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Han

4 months ago

I thought one feed split into two boards would work, but guess not!

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Ruthann

4 months ago

C is definitely not enough for a Rated-4 data center.

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Micah

5 months ago

Wait, is B really acceptable? That seems risky.

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Rory

5 months ago

Totally agree with A, redundancy is key!

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Jeff

5 months ago

A) Two feeds from two different substations, one power company not acceptable.

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Benedict

5 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

5 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

5 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

6 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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