NCCI class code 5057 covers BLAST FURNACE ERECTION within the Contractor industry. This classification is used by insurance carriers to determine workers’ compensation premium rates based on the risk level associated with these job duties.
When employers report payroll under class code 5057, the premium is calculated by multiplying the total payroll (in hundreds of dollars) by the applicable rate for this classification. The rate varies by state, carrier, and the employer’s experience modification factor (EMR).
Highest risk. The most dangerous occupations including explosives, tunneling, and deep mining.
Some states use different class codes. If your business operates in these states, use the state-specific code instead of the standard NCCI code.
| State | Code |
|---|---|
| California | 5057 |
| Delaware | 0655 |
| Michigan | 5057 |
| New Jersey | 5057 |
| New York | 5057 |
| Pennsylvania | 0655 |
| Texas | 5057 |
Class code 5057 supports the following insurance product types:
Workers’ Comp
Class code 5057 is a primary classification, meaning it directly describes the main business operations of an employer. Primary codes represent the core activity — what the business actually does.
A secondary (or standard exception) code describes support operations that exist in almost every business, like clerical work (8810) or outside sales (8742). These are assigned in addition to the primary code.
If your business primarily involves blast furnace erection, this code should be your governing classification — the one that applies to most of your payroll.
Your workers’ compensation premium for employees classified under code 5057 is calculated as:
Where the rate is determined by your state and carrier, and EMR (Experience Modification Rate) reflects your company’s claims history relative to similar businesses. A lower EMR means lower premiums.
Accurate classification is critical — misclassifying employees under the wrong code can result in overpayment or underpayment that gets corrected during an audit.
Class code 5057 (BLAST FURNACE ERECTION) is the right fit if your employees’ primary duties involve work described by this classification within the Contractor industry and your operations fall into Hazard Group G.
Consider these factors when selecting your class code:
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