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COVERAGE / WORKERS' COMP / CLASS CODES / 3724
CLASS CODE · MANUFACTURING

Class code 3724: machinery erection and repair

Code 3724 is for contractors who install or repair machinery and equipment, millwright work included, with their drivers.

SYSTEM
NCCI numbering
INDUSTRY
Manufacturing
WHERE
NCCI states, Texas included
PREMIUM ON
Payroll in this class
WHAT THE CODE COVERS

Installing or repairing machinery and equipment for others.

What work does code 3724 cover?

Florida's list titles it machinery or equipment erection or repair not classed elsewhere. Minnesota also uses it for installing overhead doors, electrical apparatus, pumps and commercial refrigeration machinery. It is not used for employees who do this work at their own employer's premises; that payroll stays in the employer's main class.

Described in our own words from Florida's construction classification rule and Minnesota's rating bureau manual. Wording and scope differ by state; the manual filed in your state decides.

Often confused with

  • 5190 Wiring within buildings, as opposed to installing machinery.
  • 5102 Metal doors, frames and sash, in Minnesota; overhead doors stay in 3724.

Which pay counts toward code 3724 premium?

Premium is figured on payroll for the work in this class, and the rate is premium per $100 of it. What counts is set state by state. Minnesota's manual and Oregon's state fund, SAIF, both count employees' pre-tax deductions, such as 401(k) and Section 125 contributions, and both leave out the overtime premium, the extra half of time and a half (Minnesota requires records that show overtime pay by employee and by class). Check your state's rules.

WHERE IT APPLIES

Where does code 3724 apply?

NCCI is the rating bureau

These states have named NCCI their rating organization, so the code comes from NCCI's manual, with each state's exceptions.

Alabama, Alaska, Arizona, Arkansas, Colorado, Connecticut, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Mexico, Oklahoma, Oregon, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, West Virginia

Texas lists 3724 in its advisory loss costs effective July 1, 2026.

Own rating bureau: check its manual

An independent bureau sets the classes. Many numbers match NCCI's, but wording and scope can differ: Indiana's bureau files NCCI's manual with Indiana-specific codes, while Minnesota's publishes its own.

California, Delaware, Indiana, Massachusetts, Michigan, Minnesota, New Jersey, New York, North Carolina, Pennsylvania, Wisconsin

State fund only

NCCI lists these as monopolistic states: workers' comp comes from the state fund, so ask the fund how it classes your work. Ohio's fund rates on NCCI classification codes; North Dakota, Washington and Wyoming use their own. Washington has its own risk classes and publishes hourly rates, so premium there follows hours worked, not payroll.

North Dakota, Ohio, Washington, Wyoming

Sources: NCCI State Map: NCCI, independent bureau and monopolistic states; TDI: Texas advisory loss costs, effective July 1, 2026. Each state's rules and sources: Workers' comp by state.

ESTIMATE YOUR PREMIUM

Your payroll, your rate, before discounts and assessments.

Payroll in this class
Gross pay for the work in this class. Pre-tax deductions (401(k), Section 125) count. Overtime premium (the extra half) usually does not. Check your state's rules.
For the cost per employee.
PAY FREQUENCY
Your rating
From your quote or policy. Where loss costs are filed instead of rates, as in Texas, they leave out the carrier's expenses and are lower than your rate.
Compares your payroll and claims with the average employer in the same class codes. At 1.00 premium is unchanged; below 1.00 it drops, above 1.00 it rises.
SCHEDULE RATING
0 if your quote shows none.
If your quote shows one.
ESTIMATED ANNUAL PREMIUM · CODE 3724
Enter your rate
Before discounts and assessments.

Worklio Insurance bills pay-as-you-go comp with each payroll, no deposit; the audit usually confirms what you've already paid.

Not included: premium discount on larger policies, state assessments, terrorism and catastrophe charges, minimum premium.Get a real quote

In North Dakota, Ohio, Washington and Wyoming, ask the state fund for your class and rate.

COMMON QUESTIONS

Does a manufacturer's maintenance crew go in 3724?
No. Minnesota's wording excludes work on the employer's own premises; that payroll stays in the main class.
Is code 3724 used in Texas?
Yes. Texas lists 3724 in its advisory loss costs effective July 1, 2026. Those are loss costs, not rates: a carrier's rate adds its own expenses.
How is the premium for code 3724 worked out?
Your payroll in this class, divided by 100, times your carrier's rate for the class. Then your experience mod, any schedule credit or debit, and an expense constant if your policy has one. Premium discounts, state assessments and minimum premiums are separate.

SOURCES

For planning, not a quote or a classification ruling. An advisor confirms your class codes with your carrier.

New to workers' comp? Worklio HCM explains workers' compensation.

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