Frequently asked, honestly answered.

Is NFPA 70E law?
No. It is a consensus standard. But OSHA cites it as evidence of hazard recognition and feasible abatement under the General Duty Clause — which means it functions as the yardstick you are measured against. "It isn't OSHA" is true and unhelpful.

Which edition applies to us?
The 2027 edition (14th), released digitally through NFPA LiNK in May 2026, is the current governing edition. Working to a superseded edition weakens your position on feasible abatement.

Do we have to follow the NEC edition our state adopted, or the current one?
For installation, the edition your AHJ has adopted. For work practices, 70E has no adoption mechanism — the current edition is the recognized industry practice regardless of what your jurisdiction adopted.

Do we need an arc flash study?
You need an arc flash risk assessment. An incident energy analysis (a study) is one of the two permitted methods; the PPE category table method is the other, and it only applies within its stated parameters. In a data center with large service transformers, equipment frequently falls outside those parameters — which effectively means a study. Check yours →

How often does the study have to be updated?
Reviewed at intervals not to exceed five years, and updated when a major modification or renovation takes place. A new transformer, a service upgrade or a capacity expansion is a major modification.

What is the biggest change in the 2027 edition?
Operationally, 130.2(A)(2) — you can no longer perform energized work alone when a permit is required and specifies shock or arc flash PPE. On paperwork, the Chapter 3 renumbering — batteries moved from Article 320 to Article 360.

Does the additional person have to be an electrician?
No. They must be trained in emergency response under 110.4(C)(1) — CPR, AED and release from contact — and be positioned outside the greater of the limited approach and arc flash boundaries.

Our program says an ESWC isn't required below 50 volts. Is that still OK?
No. 110.2(B) in the 2027 edition requires an ESWC wherever an electrical hazard exists, regardless of voltage. That language needs to come out of your program.

Do we have to retrain everyone because the edition changed?
An edition change is not itself a stated retraining trigger. But the 2027 delta is large enough — the additional person, the renumbering, sub-50 V, contact thermal — that a focused transition session is the sensible move, separate from the three-year clock.

We can't take the load down. Doesn't that make energized work justified?
No. Business continuity is a commercial constraint, not an equipment design or operational limitation. It is the most common and most expensive misreading of 130.2(A). Work the decision tree →

Our facility is 2N. Doesn't that make it harder to de-energize?
It makes it easier. A 2N facility is engineered so one path can be taken out of service while the other carries load. Reduced redundancy during the work is a risk conversation with operations — not a justification for energized work.

Is putting the UPS in maintenance bypass the same as de-energizing it?
No. Bypass energizes a path around the module. The module input stays live and the DC bus stays charged. More →

Can we lock out a battery?
Not in the sense of de-energizing it. A battery is a stored-energy source that persists with every breaker in the building open. You isolate around it, and the work on the string itself is governed by Article 360.

Do arc flash labels expire?
The assessment behind them must be reviewed at intervals not to exceed five years and updated on major modification. A label whose underlying study is stale is worse than no label, because people trust it.

How often does 70E training need to be repeated?
At intervals not to exceed three years, and sooner on job or task change, new technology or procedure, or an audit finding that the employee is not complying. More →

Does a 70E class make someone a qualified person?
No. Training is one half. The other half is a documented employer demonstration that the person can perform the specific task on the specific equipment — 110.4(A)(1)(b). Matrix tool →

Do our IT and security staff need 70E training?
They are unqualified persons under the standard and still require training in the practices necessary for their own safety, plus a qualified escort inside the limited approach boundary. An awareness session covers it. Ask about it →

Do we have to document training?
Yes, explicitly, under 105.3(A) in the 2027 edition. A sign-in sheet is attendance, not a training record. What a record needs →

Can you run a class at our site?
Yes — nationally, using your one-lines, your gear and your program. Onsite training →