Minnesota licenses boiler engineers through its Department of Labor and Industry under Minnesota Statutes section 326B.978. Engineers divide into Chief, First Class, Second Class, and Special classes, each of the first three in Grades A, B, and C — Grade A reaching steam engines and turbines, Grade B boilers generally, Grade C low-pressure boilers only. Charge limits run from the Special engineer’s fifty horsepower through Second Class at one hundred, First Class at five hundred, to the Chief’s unlimited plant. Every applicant passes a written examination at seventy percent.
This program is part of the expanding PassProfessor catalog — join the notify list and we’ll email you when enrollment opens.
What these licences authorize
Minnesota’s boiler engineer system is a grid, and it is the only one in this family built that way. Under Minnesota Statutes section 326B.978, engineers divide into four classes — Chief engineers, First class engineers, Second class engineers, and Special engineers — and each of the first three classes divides again into Grade A, Grade B, and Grade C. The class fixes how large a plant the engineer may take charge of; the grade fixes what kind of plant: Grade A covers all classes of boilers together with steam engines and turbines, Grade B covers all classes of boilers without the engines and turbines, and Grade C covers low-pressure boilers only. A licence is therefore a coordinate — a First Class, Grade B engineer is a different credential from a First Class, Grade C — and the examination is set for the coordinate applied for.
The charge limits run in round horsepower: a Special engineer may take charge of boilers of not more than fifty horsepower; a Second Class engineer, not more than one hundred horsepower, or serve as shift engineer in a plant of not more than five hundred; a First Class engineer, not more than five hundred horsepower, or serve as shift engineer in a plant of unlimited horsepower; and a Chief engineer takes charge without a horsepower limit. Behind the limits stand the experience oaths the statute requires: five years for Chief, three years for First Class, one year for Second Class, and — alone in the grid — no prior experience requirement for the Special class, the grid’s deliberate entry point. Every applicant must pass an examination developed and administered by the Commissioner of the Department of Labor and Industry, and Minnesota Rules set the minimum grade at seventy percent.
The examination at a glance
| Item | Verified position |
|---|---|
| Licences | Minnesota boiler engineer licences — Chief, First Class, Second Class, and Special classes; Grades A, B, and C within Chief, First, and Second |
| Regulator and examiner | Minnesota Department of Labor and Industry (DLI); examinations developed and administered by the Commissioner |
| Legal basis | Minnesota Statutes section 326B.978 (examinations, classifications, qualifications); examination rules at Minnesota Rules part 5225.0500 |
| Grade A | All classes of boilers, steam engines, and turbines and their appurtenances |
| Grade B | All classes of boilers and their appurtenances (no engines or turbines) |
| Grade C | Low-pressure boilers and their appurtenances only |
| Special class | Take charge of boilers of not more than 50 horsepower; no prior experience required by the statute’s qualification subdivision |
| Second Class | Take charge of not more than 100 horsepower; shift engineer to 500 horsepower; at least one year of actual operating experience |
| First Class | Take charge of not more than 500 horsepower; shift engineer in a plant of unlimited horsepower; at least three years of actual operating experience (Grade A including engine/turbine experience) |
| Chief | Take charge without horsepower limit; at least five years of actual operating experience (Grade A including at least two years on engines or turbines) |
| Age | At least eighteen years of age for the classes and grades the statute specifies |
| Examination | Written examination; minimum grade seventy percent (70%) under Minnesota Rules part 5225.0500; time limit for all boiler examinations two and a half hours (DLI) |
| Examination fee | Fifty dollars ($50) — a Department fee per DLI’s licensing page |
| Application timing | Application at least fifteen days before the requested examination date; an approved applicant may take the examination on one occasion within one year of the application (statute) |
| Licence term | Two years; licences expire at the end of the month in which the licence was originally issued (DLI) |
The grid, cell by cell
Read the grid by rows for size and by columns for kind. The rows below state each class’s charge and shift authority and its experience oath; the grade definitions above apply across every row.
Special engineer — the open door, 50 horsepower
The Special class is Minnesota’s entry point, designed to be reachable: the statute’s qualification asks competence to take charge of boilers of not more than fifty horsepower and — uniquely in the grid — prescribes no prior years of operating experience. The examination is nonetheless real: the Special candidate must still pass the Commissioner’s written examination at the seventy percent minimum, on the safe operation and maintenance of the small plant they will head. Small heating and process plants across Minnesota run under Special engineers, and the class exists so that the person in charge of a fifty-horsepower plant is an examined, licensed person rather than simply the person available.
Second Class — charge of 100, shift to 500
The Second Class engineer takes charge of boilers, engines, and turbines (Grade A) or boilers (Grade B) or low-pressure boilers (Grade C) of not more than one hundred horsepower; may operate as shift engineer in a plant of not more than five hundred horsepower; and may assist the shift engineer, under direct supervision, in a plant of unlimited horsepower. The qualification is at least one year of actual experience operating the boilers — for Grade A, including the engines or turbines the grade reaches. One year is the grid’s first experience step, and it buys the working engineer of the mid-size plant: the school district, the food plant, the hospital’s smaller boiler room.
First Class — charge of 500, shift unlimited
First Class takes charge of plant of not more than five hundred horsepower, and — the limb that makes the class the big plant’s shift credential — may operate as shift engineer in a plant of unlimited horsepower. The experience oath is three years of actual operating experience, with Grade A requiring that the experience verify competence across boilers, engines, and turbines alike. The First Class engineer is the largest plant’s shift authority and the mid-large plant’s charge authority in one licence, and the class is where most career Minnesota engineers in large institutions sit.
Chief — unlimited charge, five years
The Chief engineer is the grid’s head: competent to take charge of and be responsible for the safe operation and maintenance of all classes of boilers — and, at Grade A, of steam engines and turbines as well — without a horsepower ceiling. The oath is the family’s longest on this page: at least five years of actual experience operating the boilers, and for Grade A at least two of those years operating the engines or turbines. The chief is the person the inspection and logbook rules look to — the engineer in charge of the plant in law as in fact.
Who this licence serves
Minnesota’s grid serves a state of district heating, large campuses, hospitals, food and agricultural processing, and manufacturing, in a climate where the heating plant is life-safety equipment for half the year. The class-and-grade structure matches the workforce’s real specializations: the low-pressure heating specialist climbs the C column; the power-plant engineer climbs the A column; and employers read a licence coordinate the way they read a plant’s nameplate.
The shift-engineer limbs give the system its staffing flexibility: a plant of unlimited horsepower needs a Chief in charge but may be shifted by First Class engineers, and a five-hundred-horsepower plant may be shifted by Second Class engineers under its chief. The grid is a rostering instrument as much as a licensing one.
The route, in order
The route is administered end to end by the Department of Labor and Industry. The applicant submits the application — with the affidavit of operating experience the Department requires applicants to file to be approved to take the examination — at least fifteen days before the requested examination date; the examination fee is fifty dollars. Approval gives the applicant one examination occasion within one year of the application. Examinations are administered at DLI examination locations on scheduled days, and the time limit for all boiler examinations is two and a half hours.
Passing at the seventy percent minimum produces the licence for the class and grade examined. Licences run two years, expiring at the end of the month in which the licence was originally issued — a personal anniversary cycle rather than a common date — and the Department publishes the renewal fees that maintain them.
What makes this examination demanding
The grid itself is the first examination subject. Ten licence coordinates, three kinds of authority (charge, shift, assist), three grades with different plant kinds, and four experience oaths — a candidate who cannot place a scenario on the grid instantly will donate the administrative questions, and Minnesota’s examination is written by the same commissioner whose statute the grid is. The rules’ framing — examinations of sufficient scope to establish the competency of the applicant to operate a boiler of the applicable class and grade — makes the applied-for coordinate the syllabus.
The second demand is that the examination is written in a system that once examined orally, and the rule preserves the trace: examinations must be written unless the applicant is unable to read or write, in which case a Special or Second Class examination may be oral, with the Chief Boiler Inspector deciding oral access for First and Chief. The standard candidate’s examination is therefore a reading-and-writing test of boiler competence at a fixed pace — two and a half hours — and preparation must be done in that medium: procedures and figures produced on paper, not merely recognized.
The credential at work
A Minnesota licence coordinate is a complete professional address: class for plant size, grade for plant kind, both readable by any employer, inspector, or insurer in the state. Careers climb the grid visibly — Special to Second on the first year, Second to First on three, First to Chief on five — and sideways moves carry meaning too, the Grade C heating specialist and the Grade A power engineer holding different, equally definite territories. In a state where winter makes the boiler plant a building’s most critical system, the examined licence is the workforce’s common language.
What the PassProfessor program will cover
Practice in the examination’s own shape. Minnesota’s examination is a written sitting under a two-and-a-half-hour limit, scored against a seventy percent minimum, developed and administered by the Commissioner for the class and grade applied for. The program in the works practises in that shape: timed written sets at the sitting’s length, single-best-answer items organized by licence coordinate — the candidate’s own class and grade first, the grid’s authorities and oaths drilled as the system’s administrative core.
Written from the primary sources. The program is written from Minnesota Statutes section 326B.978, Minnesota Rules part 5225.0500, and the Department of Labor and Industry’s boiler engineer licensing pages — the classification grid, the examination standard, and the Department’s fees and timing. Where Minnesota’s class-and-grade grid differs from other states’ single ladders, the program teaches the grid and names the difference.
The whole candidate, not only the test-taker. Around the item practice, the program carries the Department of Labor and Industry route as the authority publishes it — the experience affidavit, the written examination at seventy percent, and the two-year licence — because a written examination is a means to a licence, and candidates plan better when the destination is mapped.
Preparation only. This is preparation for the written examination administered by the Minnesota Department of Labor and Industry. PassProfessor is not affiliated with the Department, no completion of this program is reported to the Department, and nothing in the program substitutes for the operating experience any class requires or for any step in the licensing process.
Tell me when enrollment opens. The Minnesota Boiler Operator / Stationary Engineer program is in the works and enrollment is not yet open. Leave an email address and PassProfessor will write to you when the program is ready — and only about this program. No date is promised, because the program will open when it meets the standard described above, not before.
Frequently asked questions
Who examines and licenses Minnesota boiler engineers?
The Minnesota Department of Labor and Industry. Each applicant must pass an examination developed and administered by the Commissioner, under Minnesota Statutes section 326B.978.
What is the difference between class and grade?
Class fixes plant size: Special (charge to 50 horsepower), Second Class (charge to 100), First Class (charge to 500), Chief (unlimited charge). Grade fixes plant kind: A includes steam engines and turbines with the boilers, B is boilers only, C is low-pressure boilers only.
Which licence needs no prior experience?
The Special class. Its qualification subdivision prescribes no prior operating years — but the written examination at seventy percent is still required.
How much experience does each class require?
Second Class: at least one year of actual operating experience. First Class: at least three years. Chief: at least five years — with Grade A at First and Chief requiring specified experience on engines or turbines within those totals.
What score passes the Minnesota examination?
Seventy percent. Minnesota Rules part 5225.0500 provides that no new licence of any class will be granted to an applicant who fails to obtain a score of at least seventy percent.
How long is the examination sitting?
The Department sets the time limit for all boiler examinations at two and a half hours.
What does the examination cost?
The Department’s examination fee is fifty dollars. Apply online to be approved to take the examination, with the affidavit of operating experience the Department requires.
When must I apply?
The statute requires the application at least fifteen days before the requested examination date, and an approved applicant may take the examination on one occasion within one year of the application.
Can a Second Class engineer work in a plant larger than 100 horsepower?
Yes, in the statute’s other limbs: as shift engineer in a plant of not more than 500 horsepower, or assisting the shift engineer under direct supervision in a plant of unlimited horsepower. Charge is the 100-horsepower limb.
How long does the licence last?
Two years, expiring at the end of the month in which the licence was originally issued.