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29 CFR 1910.146, Permit-Required Confined Spaces
29 CFR 1910.252: Welding, Cutting, and Brazing
General industry best practices
Hot work is any work that involves the use of an open flame or creates heat, sparks, or flames. Typical hot work activities include gas welding, arc welding, grinding, and cutting. A designated hot work area is an area that has been designed or approved to house hot work operations. Hot work should be performed in designated hot work areas whenever possible. If hot work cannot be performed in a designated hot work area, workers must obtain a hot work permit. The hot work permit is intended to make sure all conditions are safe before hot work begins. There is no single hot work permit that every company uses, and the permit used at your company may be different from the permit another company uses. A sample hot work permit is included in the National Fire Protection Association's NFPA 51B Standard for Fire Prevention During Welding, Cutting, and Other Hot Work. This sample hot work permit can be modified to match a company's specific safety needs.