Which of the following describes 'hot work' according to the ordinance?

Hot work is defined as operations involving open flames or producing sparks, which can lead to a fire or explosion hazard in certain environments. This includes activities like cutting and welding, where high temperatures are generated, and the potential for igniting flammable materials is significant.

In a work environment, these operations require stringent safety measures and special precautions, such as using fire watch personnel and ensuring proper ventilation, to mitigate the inherent risks. The definition is particularly important in settings where flammable materials are present, underscoring the necessity of identifying and properly managing tasks that fall under this category.

The other activities listed, such as light assembly work, routine maintenance, and electrical troubleshooting, typically do not generate the same level of risk associated with flames or sparks and are therefore categorized differently regarding safety regulations and precautions.