On a data center site, everybody can be cited.
A hyperscale project has an owner, a general contractor, an electrical prime, a dozen subs, a commissioning agent and OEM technicians — often several thousand people from several dozen employers. OSHA's multi-employer policy decides which of them gets the citation, and the answer is frequently "more than one."
On a multi-employer worksite, more than one employer may be citable for a hazardous condition. OSHA evaluates each employer against four categories: creating, exposing, correcting and controlling. An employer can fall into more than one.
§ The four categories
Creating employer. Caused the hazardous condition. Citable even if its own employees are not exposed.
Exposing employer. Its own employees are exposed. Citable even if another employer created the hazard — unless it did not know and could not have known with reasonable diligence, and took steps to protect its employees.
Correcting employer. Engaged in a common undertaking and responsible for correcting the hazard. Must exercise reasonable care.
Controlling employer. Has general supervisory authority over the worksite, including the power to correct or require correction. Usually the general contractor. Must exercise reasonable care to prevent and detect violations — the standard of care is lower than that of the employer whose employees are exposed, but it is not zero.
§ Who is who on a data center project
| Party | Typical category | Practical exposure |
|---|---|---|
| Owner / developer | Controlling, sometimes creating | Rises sharply where the owner directs means and methods, or where owner-furnished equipment or an owner-operated live system creates the hazard |
| General contractor | Controlling | Reasonable care to inspect, detect and require correction across every sub on the site |
| Electrical prime | Creating, exposing, correcting | Temporary power, energization sequence, and the live-adjacent work |
| Subcontractors | Exposing, sometimes creating | Own crews, own training records |
| Commissioning agent | Exposing, sometimes creating | Directs energization and testing — the highest-risk sequence on the project |
| OEM technicians | Exposing | Frequently the least integrated into the site program, and often the most qualified on their own equipment |
Contract language assigning safety responsibility to subcontractors does not remove the GC from the controlling employer category. What discharges reasonable care is an actual inspection regime — frequency, scope, documentation and follow-up on correction.
§ The NFPA 70E overlay — 110.5
On the electrical side, 110.5 imposes a parallel and more specific obligation. The host employer must provide known hazards, information about the installation, and the site-specific safety-related work practices — and must report observed contractor violations back to the contract employer. The contract employer must ensure its employees are trained in those hazards and practices, and advise the host of hazards its own work introduces. Both parties document a meeting.
On a live campus this is not academic. The GC's crew needs to know which gear is energized, what the arc flash boundary is, and who has the authority to energize. That information exists on the operations side of the wall and has to cross it in writing.
The 110.5 exchange happens verbally at a project kickoff and is never documented. With a dozen subcontractors and rolling crews, "we told them" is not a record. Make it a signed form in the prequalification package and repeat it at each phase change.
§ The prequalification package
The practical artifact that satisfies both doctrines at once. It should contain, per contractor:
- Written safety program and electrical safety program.
- Training records — including NFPA 70E training with the edition named, per 105.3(A).
- Qualification records by task and equipment class, per 110.4(A)(1)(b). Matrix tool →
- Rubber goods and arc-rated PPE inventory with test dates.
- Competent person designations by discipline — fall protection, excavation, scaffolding, cranes.
- Incident history and EMR.
- Signed 110.5 information exchange.
Certificates built for the prequal package
Attendee, date, content, edition, evaluation and instructor credential — the record the GC and owner will ask for.
For employers See the schedule