What 5183 covers
- Installing, repairing, and maintaining water, gas, and drainage piping and fixtures.
- The contractor's shop work, such as cutting and preparing pipe.
- In North Carolina's description, underground lawn sprinkler installation with the trenching the same contractor performs, and pump or boiler installations of a domestic or residential nature.
What doesn't belong in 5183
- Automatic fire sprinkler installation.
- Sewer construction and water or gas main construction.
- In New York's description, work outside buildings — its 5183 applies inside buildings only.
Official titles by state
Each rating bureau publishes its own definition. Titles below are quoted exactly as the bureau publishes them; follow the link for the full official description.
| State | Official title for 5183 | Source |
|---|---|---|
| North Carolina | PLUMBING NOC & DRIVERS | North Carolina bureau lookup |
| Massachusetts | PLUMBING NOC & DRIVERS | Massachusetts bureau: 5183 |
| New York | Plumbing – NOC – All Operations to Completion & Drivers | New York bureau: 5183 |
Codes 5183 is often confused with
What a premium audit looks at
- Invoices separating plumbing from fire sprinkler, sewer, or main work.
- Whether any work is outside buildings, especially in New York.
- Subcontracted trades and their certificates of insurance.
Frequently asked questions
Does class code 5183 cover fire sprinkler installation?
No. Automatic sprinkler installation has its own classification.
Are a plumbing company's drivers included in 5183?
Yes. The title's "& Drivers" means the contractor's drivers are included in the same classification.
Check the official manuals
- NCCI Class Look-Up The official tool for the states where NCCI administers the classification system.
- WCIRB California Classification Search California runs its own classification system; its code numbers don't map one-to-one to NCCI's.
- NYCIRB Classification Digest New York's official classification descriptions.
- WCRB Massachusetts Class Code Lookup Massachusetts' official classification descriptions.
- NCRB North Carolina Class Code Lookup North Carolina's official classification descriptions.
Related terms
General information, not a classification ruling. Summaries on this page are written in plain English from the bureaus' published descriptions; the classification manual for the state where the work was performed governs, and the carrier and rating bureau determine the classification for any policy.