Operations — where the pressure is.
The construction risk is visible and heavily policed. The operations risk is quiet: a small permanent team, a facility that must not go down, and a slow accumulation of deferred maintenance that nobody experiences as a hazard until it is.
Concurrent maintainability means one path can be serviced while the other carries load. That is a reliability feature. It does not by itself justify energized work — and used properly, it is the strongest available argument for establishing an electrically safe work condition, one path at a time.
§ Daily risks
Energized work under production pressure. The permit process is where this gets caught or missed. Decision tree →
Incomplete isolation. A lock on the A side and an assumption about the B side. Source mapper →
Deferred maintenance. Every month a breaker goes unexercised, the clearing-time assumption behind your PPE selection gets less true. The label does not change. The hazard does. Chapter 2 →
Procedures behind the facility. Capacity expansions change topology faster than documents update. The annual procedure audit exists for this — 110.3(L)(4).
Unqualified people in energized space. Security, IT, janitorial and vendor staff. They need training and, inside the limited approach boundary, an escort.
Height and heat. Rooftop mechanical at a 4-foot trigger, and contained hot aisles running 95–110 °F. Subpart D →
§ Vendors and remote hands
An operating data center runs on people who do not work for it — OEM service technicians, electrical contractors, and in colocation, customer staff performing remote-hands work in a shared space.
Under 110.5 the host employer must provide known hazards, installation information and site-specific practices, and must report observed violations back to the contract employer. The contract employer must ensure its people are trained in those hazards. Both document a meeting.
In colocation the responsibility split needs to be explicit in the contract: who owns the rack PDU, who may open a cabinet, what the customer's technician is permitted to touch, and what happens when they are inside an energized space unescorted.
A verbal safety briefing at the badge desk treated as the 110.5 exchange. It is not a record, and on a site with rotating vendor staff it is not a control either.
Give them the standard to point at
Weekly NFPA 70E qualified person training on the 2027 edition — including the justification decision that production pressure attacks hardest.
See the schedule Bring it onsite