Score Higher on Verified CDFOM | Certified Data Center Facilities Operations Manager Exam Questions with Answers

In the EPI Facilities Operations Manager body of knowledge, theLock-Out/Tag-Out (LOTO)procedure is a mandatory safety control to ensure that electrical or mechanical equipment cannot be energized while work is being performed. A core principle emphasized in EPI safety training is:

“The person who applies the lock must be the same person who removes it.”

This aligns with international best practices for occupational health and safety, where LOTO ensures that the individual performing maintenance or repair has full control of the energy isolation device.

Why this is required:

Personal Safety ResponsibilityThe lock identifies the technician directly working on the equipment. Only they can confirm whether work is complete and the area is safe for re-energizing.

Risk PreventionIf someone else removes the lock (another operator, safety manager, or facilities manager), they may incorrectly assume that the equipment is ready to be restored, which can lead to severe injury or fatality.

Compliance With EPI Safety GuidelinesEPI emphasizes the principle of“single-person control”over hazardous energy. No supervisor or colleague may remove another technician’s lock unless a formal, documented emergency override procedure is followed — which isnot considered standard practice.

Clear Accountability ChainLOTO prevents ambiguity or miscommunication. The technician who placed the lock is the only one with full knowledge of the work status and hazards involved.

Why other options are incorrect:

A, B, and Cviolate the fundamental LOTO rule because they involve someone other than the applying operator removing the lock.

Oversight personnel (safety manager, facilities manager) monitor and audit the process, but they should not remove another person’s lock except under rare, emergency, escalation-approved situations.

EPI DCFOM-Aligned Reference Concepts

LOTO must ensure the isolation device is locked and tagged by the person performing the work.

Only the same individual may remove their own lock.

Removal by another party is only permitted under controlled, documented emergency protocols.

The process prevents accidental energization and protects worker safety.

EPI distinguishes between:

Service Portfolio? internal document used for service design, planning, assessment

Service Catalog? customer-facing document listing available services

Theservice catalogprovides customers with:

Service descriptions

Service options

Ordering information

Terms and conditions

SLA details

Pricing models (where applicable)

It is specifically designed to allow customers to select and order services.

Why other options are incorrect:

A: Service portfolio is internal only.

B: BCP is unrelated to service ordering.

C: Needs analysis is internal planning documentation.

Thus,Dis correct.

EPI DCFOM-Aligned Reference Concepts (Paraphrased)

The service catalog contains all customer-orderable services.

It is the primary communication tool for customer consumption.

Power Usage Effectiveness (PUE) is the most widely recognized efficiency metric in the data center industry and is strongly emphasized within EPI's environmental sustainability and energy management teachings. PUE is designed to show how efficiently a data center uses energy, focusing specifically on how much of the total facility energy actually reaches the IT equipment. The correct formula is:

PUE = Total Facility Power ÷ Total IT Equipment Power

“Total Facility Power” includes all supporting infrastructure: cooling systems, UPS losses, power distribution losses, lighting, security, fire systems, and all auxiliary loads required to operate the data center. “Total IT Equipment Power” refers only to the active IT load such as servers, storage, and network devices.

A PUE value close to1.0indicates optimum energy efficiency, meaning nearly all facility energy is being consumed directly by IT operations. Higher PUE values indicate less efficient facilities where substantial energy is being consumed by overhead systems. This metric is essential for sustainability strategies, capacity planning, and continuous improvement. It allows benchmarking across facilities and helps operators set improvement targets by analyzing where energy losses occur. Because of its simplicity and clarity, PUE remains an industry-standard metric recognized globally.