The Korean Data Center Fire Was Man-Made: 5 Operational Discipline Lessons for US Facilities

A data center fire in South Korea has delivered a warning that US operators should take seriously: sophisticated infrastructure cannot compensate for basic operational failures.

The fire occurred on September 26, 2025, at the National Information Resources Service facility in Daejeon during work to relocate lithium-ion UPS batteries. A subsequent national audit described the incident as a “man-made disaster.” Investigators found that battery relocation had been subcontracted to firms that were not properly registered for electrical work. Workers also failed to fully isolate the battery racks and did not adequately insulate energized cable terminals.

The result was not only a fire. The incident disrupted hundreds of government systems and exposed weaknesses in contractor oversight, emergency response, work authorization, and power-protection design. The audit findings reported by UPI and South Korean media coverage offer a direct lesson for US facilities: operational discipline is part of the power architecture.

Why the Status Quo Fails

Data centers often invest heavily in UPS capacity, redundant distribution, battery monitoring, fire detection, and backup generation. Yet the highest-risk event may begin with a routine maintenance task.

A battery relocation, replacement, or inspection can introduce electrical, chemical, thermal, and mechanical hazards. If a work crew is not properly qualified, if a disconnect is assumed rather than verified, or if a permit is treated as paperwork instead of a control, the site’s Redundancy can quickly become irrelevant.

The Korean incident also demonstrates why Thermal Management and emergency isolation must be treated as operational requirements, not just engineering features. A battery room can be designed with monitoring and suppression, but operators still need to know who may enter, what must be isolated, how isolation is verified, and how emergency services will respond.

For US data centers, OSHA requirements, local electrical codes, NFPA standards, insurance controls, and internal procedures should work together as one operating system.

1. Qualify Contractors Before They Enter the Critical Environment

The first lesson is straightforward: a contractor’s price and availability are not sufficient qualifications for work on UPS or energy-storage systems.

Before approving a contractor, facility managers should verify:

• Electrical licenses and registrations required by the applicable state and jurisdiction.
• Experience with the specific UPS, battery chemistry, voltage, and configuration on site.
• Training records for electrical safety, arc-flash hazards, hazardous energy control, and battery handling.
• A written safety program, including lockout/tagout and emergency procedures.
• Insurance, incident history, references, and evidence of supervisor competence.
• The names and qualifications of every subcontractor expected to perform the work.

The last point is essential. A prime contractor may be qualified while a lower-tier subcontractor is not. The host facility should maintain a complete chain of responsibility from the contracting entity to the individual technician performing the work.

Contract language should prohibit unapproved subcontracting and require written authorization for any change in personnel or scope. The facility should also conduct a pre-job briefing with the contractor, operations team, safety representative, and affected tenants.

For mission-critical sites, “qualified” should mean more than familiar with the equipment. It should mean capable of recognizing stored energy, understanding the site’s electrical topology, following the facility’s isolation procedures, and stopping work when conditions differ from the approved plan.

2. Treat Lockout/Tagout as a Verification Process

The Korean audit found that only one of eight battery devices had been powered down before work began. Other racks remained energized, and cable terminals were not properly insulated.

That is not a documentation failure. It is a failure to establish and verify a zero-energy state.

US facilities should align their procedures with OSHA’s hazardous energy control requirements under 29 CFR 1910.147. For battery and UPS work, a site-specific lockout/tagout procedure should identify:

1. Every electrical source, including utility feeds, bypass sources, rectifiers, chargers, battery strings, DC buses, and backfeed paths.
2. Stored energy that may remain after a breaker or disconnect is opened.
3. The authorized employee responsible for applying locks and tags.
4. The method used to discharge, block, or otherwise control stored energy.
5. The test equipment and verification method used to confirm de-energization.
6. The process for group lockout, shift changes, and contractor coordination.

A breaker position or control-panel indication is not, by itself, proof of a safe condition. Verification should include an appropriately rated test instrument, a test of the known live source, a test of the isolated circuit, and a re-test of the known live source where required by the site’s electrical safety program.

The work should not begin until the person performing the task: and the responsible facility representative: agree that the isolation is complete. If the equipment cannot be fully de-energized, the work scope should be redesigned, postponed, or managed under a documented energized-work process by properly qualified personnel.

3. Require a Work Permit for High-Consequence Tasks

A work permit creates a controlled handoff between operations and maintenance. It defines what is being done, where it is being done, who is authorized, what hazards exist, and what conditions must remain true while the work proceeds.

Battery relocation and replacement should normally require a permit that includes:

• Detailed scope of work and equipment identification.
• Approved drawings or one-line diagrams.
• Battery chemistry, voltage, capacity, and physical handling requirements.
• Required isolation points and verification steps.
• Arc-flash boundary and personal protective equipment requirements.
• Fire protection and emergency communication requirements.
• Housekeeping, tools, lifting equipment, and material staging controls.
• Start, stop, and escalation criteria.
• Final inspection, testing, and return-to-service authorization.

The permit should be issued by someone who understands the site’s operating state: not simply by the contractor performing the work. For a live data center, the permit process should also account for business impact. A seemingly isolated battery string may support a redundant UPS module, maintenance bypass, or downstream load that is not obvious from the immediate work area.

A permit is not valid indefinitely. If the crew changes, the scope changes, an alarm occurs, environmental conditions shift, or the work extends beyond the approved window, the permit should be suspended and revalidated.

For confined or restricted battery spaces, facilities should also complete the required hazard assessment under OSHA’s permit-required confined-space standard. Not every battery room is a permit-required confined space, but every facility should document its determination.

4. Make Battery Room Protocols Specific to the Technology

Battery rooms are not generic electrical closets. Their risks vary significantly by chemistry, installation design, ventilation, enclosure, monitoring system, and proximity to other critical equipment.

A practical battery room protocol should address:

• Access control and authorized personnel.
• Required ventilation and environmental limits.
• Hydrogen or off-gas detection where applicable.
• Thermal monitoring and alarm thresholds.
• Battery rack spacing and physical separation.
• Spill response and electrolyte exposure procedures.
• Fire detection, suppression, and emergency responder coordination.
• Remote and local emergency disconnects.
• Safe movement and lifting of battery modules.
• Inspection of cable insulation, terminals, connectors, and torque values.
• Post-work testing and documentation.

Facilities using lithium-ion energy storage should evaluate the installation against applicable provisions of NFPA 855, local fire codes, manufacturer instructions, and the authority having jurisdiction. Lead-acid installations require their own controls for ventilation, electrolyte exposure, and charging conditions.

Power-protection equipment should also be arranged so that a localized battery event does not disable every layer of Redundancy. Where practical, battery systems, UPS modules, distribution equipment, and control systems should be separated or compartmentalized. Operators should be able to isolate an affected zone without entering a hazardous area, subject to the approved design and emergency procedures.

Monitoring is valuable, but it is not a substitute for physical controls. Remote alerts, DCIM integration, and battery management systems can reduce response time, but they cannot correct an unsafe work method.

5. Build Audit Readiness Into Daily Operations

The Korean incident became a national audit because the facility could not demonstrate that its controls were working when they mattered.

Audit readiness should not mean preparing binders after an incident. It should mean maintaining evidence continuously.

A facility manager should be able to produce:

• Current single-line diagrams and battery-room layouts.
• Equipment-specific LOTO procedures.
• Contractor licenses, training records, and insurance documentation.
• Approved work permits and pre-job briefings.
• Battery inspection, testing, and maintenance records.
• Fire protection inspection reports.
• Alarm and monitoring system test results.
• Emergency response plans and drill records.
• Records of corrective actions and closeout verification.
• A current list of authorized employees and emergency contacts.

Conduct periodic field audits, not just document reviews. Observe whether technicians actually verify zero energy, use the required PPE, maintain access paths, protect cable ends, and follow the permit boundaries.

Run realistic emergency exercises with operations staff, security, contractors, and local responders. Test whether the team can identify the affected zone, communicate the hazard, isolate power safely, preserve life safety, and recover critical services. If the response depends on one individual’s memory, the process is not resilient.

Ace Real-Time Solutions can help facilities connect the hardware, monitoring, and service disciplines that support this approach. Our services team supports power protection planning, installation, maintenance, and lifecycle management. Facilities can also review battery solutions and advanced battery management strategies.

The Operational Discipline Roadmap

Facility managers can begin with five actions:

1. Audit contractor credentials: Identify every company and technician with access to UPS, battery, and electrical systems.
2. Revalidate LOTO procedures: Walk down each isolation point and confirm that procedures match the installed equipment.
3. Standardize work permits: Require permits for battery relocation, replacement, energized testing, bypass operations, and other high-consequence tasks.
4. Review battery room separation: Confirm monitoring, ventilation, fire protection, emergency disconnects, and responder access.
5. Schedule a field audit and drill: Test both work execution and emergency response, then track corrective actions to closure.

The central lesson is not that technology failed in South Korea. It is that technology cannot overcome unmanaged work.

Reliable uptime depends on qualified people, verified isolation, controlled access, accurate documentation, and equipment designed for safe intervention. That is the real standard for modern infrastructure and power protection solutions.

Visit acerts.com to request a power audit, discuss a solution design, or ask for a technical specification sheet for your facility. For enterprise planning, use the enterprise request-for-quote page.

Frequently Asked Questions

What caused the South Korean government data center fire?

According to the national audit, the September 2025 fire began during lithium-ion UPS battery relocation work. Investigators identified illegal or unverified subcontracting, incomplete power isolation, and improperly insulated cable terminals as key contributing factors. The audit characterized the incident as a man-made disaster.

How does lockout/tagout protect data center battery technicians?

Lockout/tagout prevents the unexpected release of hazardous energy during maintenance. For UPS and battery systems, it requires identifying all energy sources, isolating them, applying locks and tags, controlling stored energy, and verifying the zero-energy state before work begins. US facilities should develop equipment-specific procedures aligned with OSHA 29 CFR 1910.147.

What should a data center battery-room audit include?

A battery-room audit should review contractor qualifications, LOTO procedures, work permits, access controls, ventilation, thermal and gas monitoring, fire protection, emergency disconnects, equipment separation, maintenance records, and response drills. It should include both document checks and direct observation of field practices.