Welding (C-60) · Lesson 5 of 6

Hot Work: Permit, Fire Watch Timing, and the Extinguisher Rule

"Hot Work: Permit, Fire Watch Timing, and the Extinguisher Rule" is lesson 5 of 6 in the Welding (C-60) Learning Hub. It opens with "When a Hot Work Permit Is Required" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. When a Hot Work Permit Is Required
  2. Where Hot Work Is Not Allowed Without Approval
  3. Protecting Combustibles
  4. Fire Watch: Duration, Coverage, and Extinguisher
  5. Area Review, Pre-Hot-Work Check, and Signs

The worked example in the course applies this lesson to a realistic job in 5 steps, from "Find when the fire watch may end" through "Plan the area review".

What you'll be able to do

  • Explain the main idea of "Hot Work: Permit, Fire Watch Timing, and the Extinguisher Rule" in plain language you can use on the exam.
  • Apply this step with confidence: "Protecting Combustibles".
  • Apply this step with confidence: "Fire Watch: Duration, Coverage, and Extinguisher".
  • Apply this step with confidence: "Area Review, Pre-Hot-Work Check, and Signs".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Hot Work: Fire Watch, Extinguisher, and RecordsEXTINGUISHER WITHIN 30 FT30 ft zoneHOT WORK24 ftOK42 fttoo far010203040feet from the hot work42 - 30 = 12 ft: move it closerMinimum rating: 2-A:20-B:CFRIDAY TIMELINE8:00 am Fri Hot work beginspermit issued, pre-hot-work check done2:40 pm Fri Last arcfire watch continues in place3:10 pm Fri Fire watch may end2:40 pm + 30 min (3504.2.1)Sun 2:40 pm Records kept until at least48 hours after work completes (3503.3, 3503.5)Fire watch ends 3:10 pm (2:40 + 30 min); records kept to Sun 2:40 pmExtinguisher must be within 30 ft: move it 12 ft closerSources: 2025 California Fire Code 3503.3, 3503.5, 3504.2.1, 3504.2.6CC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: When a Hot Work Permit Is Required

The 2025 California Fire Code, Section 105.5.25, requires an operational permit for hot work including portable hot work equipment used inside a structure (except work conducted under a construction permit), fixed-site equipment such as welding booths, hot work in a wildfire risk area, and application of roof coverings with an open-flame device. Where approved, a facility can run its own hot work program, and its trained responsible person issues the permits (Section 3503.3). The permit must be available for review while the work is conducted and for 48 hours after the work is complete, and "prework check" reports must be kept on the premises for not less than 48 hours after the work is complete (Sections 3503.3, 3503.5).

Step 2: Where Hot Work Is Not Allowed Without Approval

Section 3501.3 limits hot work to areas designed or authorized for it. Without fire code official approval, hot work shall not be conducted where the automatic sprinkler system is impaired, where an explosive atmosphere could exist (flammable gases, liquids, or vapors present), where readily ignitable materials are stored (bulk sulfur, baled paper, cotton, lint, dust, loose combustibles), or on board ships at dock or under construction or repair. Section 3504.1.8 adds that automatic sprinkler protection shall not be shut off while hot work is performed.

The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.

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