Hot work is defined as any activity that involves open flames or produces heat and/or sparks capable of initiating fires or explosions. Examples of hot work include: welding, cutting, grinding, drilling, soldering, brazing, torch-applied roofing, etc.
Hot work may also include electrical work in areas which may contain flammable or explosive atmospheres. This list is not exhaustive, but should serve to highlight the type of activity which constitutes hot work.