One state, two electrical codes. Most bids are written as if there were one.
An arc flash hazard analysis, an arc flash assessment and an arc flash study are three names for the same deliverable. What is not the same is the code behind it. A plant in upstate New York and a building in the five boroughs are inspected against different editions of different documents, and the label that satisfies one does not automatically satisfy the other. This page is which applies to you, and what it changes.
The inside of the cubicle is where a study is either verified or assumed.
Trip unit settings read at the device, not taken from a drawing.
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Jurisdiction
Which safety rules actually cover your New York plant
New York does run its own occupational safety plan. For almost every industrial site in the state, it is not the one that applies.
PESH covers public employees only. The New York Public Employee Safety and Health programme covers state and local government workers · a municipal water plant, a county facility, a public authority. A semiconductor fab, a research campus or a private manufacturing site is not inside it.
Private sector New York is federal OSHA. The duty that binds your plant is 29 CFR 1910.132(d) · assess the hazard, and hold a written certification that the assessment was performed. The study is what makes that certification possible to write and defensible to produce.
Parts of upstate New York genuinely sit under both frames. Where a site operates an installation existing for the sole purpose of generating or distributing electric power, 1910.269 reaches it as well, alongside Subpart S for the utilisation system feeding process load. Those are separate frames and a competent study names which one governs each part of your plant rather than blurring them.
Your site is…
Covered by
The duty that bites
A private plant, fab, campus or data centre
Federal OSHA
29 CFR 1910.132(d)(1) hazard assessment and 1910.132(d)(2) written certification
A state, county or municipal facility
PESH, New York’s public employee plan
The same standards, enforced by the state rather than by federal OSHA
An installation for the sole purpose of generating or distributing power
1910.269, alongside Subpart S
Named separately in the deliverable, because the two frames are not interchangeable
Not sure which frame your site sits under? Tell us the plant type and we
will name it, whether or not you invite us to bid.
The code your inspector actually holds
Which electrical code New York enforces, and why the answer has two halves
Outside the five boroughs, the 2025 New York State Uniform Code references the 2023 National Electrical Code, applying to permit applications filed on or after 31 December 2025.
Inside New York City, there is a separate document. The 2025 New York City Electrical Code took full effect on 21 December 2025 and consists of city amendments to the 2020 edition of NFPA 70. The city amendments are frequently stricter than the national text, and they, not the state adoption, are what a New York City inspector holds.
Why this decides your labels. NEC 110.16(B) requires arc flash marking on service equipment to carry the nominal voltage, the available fault current, the clearing time of the service overcurrent devices and the date the label was applied. NFPA 70E does not require a date. A label built to 130.5(H) alone therefore does not satisfy the NEC, which is the single most common gap we find on an existing estate.
The threshold is not the same on both sides of the state. The 2023 edition upstate applies 110.16(B) to service and feeder supplied equipment rated 1,000 amperes and above. The 2020 base the city works from applies at 1,200 amperes and to service equipment. Same clause number, different reach · which is why an estate cannot be labelled to one rule and assumed compliant in both.
And New York City has put a clock on it. Under Local Law 128 of 2024, carried into the 2025 New York City Electrical Code, service equipment in a building electrical room at or above the threshold must carry an arc flash label to NFPA 70E, with one year from the code taking effect on 21 December 2025 to complete the work. A label is the output of a study, and a study takes six weeks. The arithmetic on that is not generous.
What binds every label in the state today is NEC 110.21(B) and NFPA 70E 130.5(H) · field-applied hazard marking must be durable enough for the environment it lives in, made explicit in the 2024 edition of 70E. A label that has faded is not a label, wherever it is.
We print an assessment date on every label regardless of jurisdiction, and we label to the lower threshold. It costs nothing, it satisfies both reaches of 110.16(B) outright, and it means an estate split across the state carries one label standard rather than two.
An estate with a plant in Buffalo and a building in Brooklyn is inspected against two different electrical codes, at two different thresholds. Ask any bidder which one they are designing each label to.
The current template, with the assessment date on it. Nominal
voltage, arc flash boundary, incident energy at a stated working distance, both approach
boundaries and the arc rated ensemble written out. One PPE method, never two.The same label where it belongs, on the equipment door. Printed on media rated for
the area, fitted by us, and photographed into the field data pack.
New York plant types
Four New York plants, four different studies
New York holds a wider spread of plant types than any neighbouring state, from new semiconductor capacity to buildings older than the code that governs them.
Semiconductor and advanced manufacturing, upstate
New capacity arriving on grid infrastructure that predates it by decades, and a facility that cannot take an unplanned outage at any price. The study is planned around tool-install windows and commissioning sequences rather than around a maintenance shutdown, because there is not going to be one.
Life sciences and research campuses
Smaller and more numerous than the pharmaceutical estates further south, and usually with qualification protocols and change control wrapped around any label that goes onto a panel inside a controlled area. The engineering is straightforward. The access is not.
New York City buildings and critical services
The city code, house service arrangements the rest of the state never sees, and no room to work anywhere. Equipment is opened in a live building at night, which makes the sequencing of the walkdown and the label installation the governing constraint.
Hydro, transmission and upstate utility-adjacent industry
Where 1910.269 and Subpart S genuinely both apply, to different parts of the same site. A study that names one frame and stays silent on the other has answered half the question.
Delivery
How the work runs on a New York site
Field work runs from our United States team, supported by the analytical bench in Hyderabad. Walkdown findings from a Tuesday afternoon are modelled overnight, so a study that would run eight weeks sequentially closes in six.
The report is delivered PE stamped, sealed by a Professional Engineer licensed for the jurisdiction. This matters more in New York than almost anywhere: public specifications in this state name a New York State registered Professional Engineer as a condition of the work, not as a preference. Every section additionally carries a named Chartered Engineer signature · the Practice Lead drafts, the Principal Reviewer independently cross checks.
No plant shutdown is required for the analysis. Only label installation needs brief access to each item, sequenced against your outage window, your tool-install schedule or your night-work permit, whichever governs.
Cable routes verified in the trench, because a route assumed from a drawing is an
impedance assumed from a drawing.Where the calculated boundary needs a physical demarcation, it is marked in the
same visit as the labels.
The four stages, their durations and the sign-off gate at each
one are the same wherever we work and are set out once on the
United States page rather than repeated here.
Send your outage window and we will sequence the walkdown and the label
installation against it.
After the study
What happens after the labels go up
On a New York estate the briefing usually has to run more than once · a day shift and a night shift, or an upstate plant team and a city building crew who will never be in the same room. We plan for that rather than treating it as an exception.
Where a crew is going to rack a breaker they have not racked before, they rehearse it in VR against a model of their own switchgear first. On a facility that cannot take an unplanned outage, the cost of learning it live is the whole argument. Retraining, label currency and the five year review run as a programme, set out on VB Arc360.
The handover briefing on the last day on site, for the people who will read the
labels every shift.A switching sequence rehearsed in VR against a model of the site’s own
switchgear, before it is done live.
Questions from New York sites
Questions we get from New York plants
Which electrical code does New York enforce?
Two answers, and which one applies depends on where the site is. Outside New York City the 2025 State Uniform Code references the 2023 National Electrical Code for permits filed on or after 31 December 2025. Inside the city, the 2025 New York City Electrical Code applies, built on the 2020 edition of NFPA 70 with city amendments that are often stricter.
Is there a deadline for arc flash labels in New York City?
The 2025 New York City Electrical Code, carrying Local Law 128 of 2024, took effect on 21 December 2025 and allows one year to complete the labelling of service equipment in building electrical rooms at or above the threshold. A label is the output of a study, and a study runs about six weeks from walkdown to installation, so the scoping conversation needs to happen well before the deadline rather than against it. Confirm the position for your building with the Department of Buildings.
Does the New York City Electrical Code apply to my building instead of the NEC?
Inside the five boroughs, yes. The city maintains its own electrical code rather than adopting the state's edition, and it is the document a city inspector holds. Confirm the position with the authority having jurisdiction before a label specification is fixed, because the city amendments do not always match the national text.
Does my arc flash label need a date in New York?
Upstate, yes. NEC 110.16(B) requires the date the label was applied on service and feeder equipment rated 1,000 amperes and above, and that clause is in the 2023 edition the state references. Inside New York City the answer comes from the city code instead. VB Engineering prints an assessment date on every label regardless, so an estate split across the state carries one standard rather than two.
Does PESH cover my plant?
Only if you are a public employer. New York's Public Employee Safety and Health programme covers state and local government workers. Private industry in New York is under federal OSHA, so the certification duty in 1910.132(d)(2) is the one to plan against.
Does an arc flash study in New York have to be sealed by a New York registered PE?
Public specifications in this state routinely name a New York State registered Professional Engineer, skilled in performing and interpreting power system studies, as a condition of the work. Our reports are delivered PE stamped and sealed for the jurisdiction, so the requirement is met rather than argued about after award.
Is an arc flash study required in New York?
New York does not name an arc flash study in its own right. Federal OSHA requires the employer to assess the hazard and hold a written certification that the assessment was performed. An incident energy analysis to NFPA 70E and IEEE 1584-2018 is how that duty is discharged and evidenced.
How long does an arc flash study take in New York?
Six weeks for a single site. An estate split between upstate plants and city buildings takes longer, not because of the engineering but because the two halves are inspected against different codes and the label specification has to be settled for each before printing starts. We fix that in scoping so it does not surface after award.
Can you study a semiconductor or life sciences facility without stopping production?
Yes, and it is the normal condition rather than the exception. No plant shutdown is required for the analysis itself. Label installation needs brief access to each item and is sequenced against tool-install windows, qualification schedules or night-work permits, whichever governs the area.
What is the difference between an arc flash hazard analysis and an arc flash assessment?
Nothing of substance. Hazard analysis, assessment and study are three names for the same deliverable, and an arc flash survey usually means the field work inside it. What matters is the calculation standard, IEEE 1584-2018, and whether the inputs were verified in the field rather than assumed from a drawing.
What if there is no current single line diagram?
It is rebuilt from the field first, and in New York that job is often larger than the calculation. Buildings here routinely predate the drawings that describe them and have been re-served two or three times since. We establish the position during scoping and put the basis in the proposal, so it is priced in the tender rather than argued as a variation.
Start with the certification you are required to hold.
Send the sites, the voltage levels and the substation count. A Chartered Engineer comes back inside one business day with a scoped bus count and the code frame that applies to each location.
Sites both upstate and in the city? They are on two different codes.
Arc flash study · New York
Tell us the site, the date on your last hazard assessment certification, and your
next outage window.
A Chartered Engineer responds inside one business day.
