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The primary use of a rubber mat in safety practices is to insulate personnel from the ground. This insulation is particularly important in environments where electrical hazards are present, as rubber is a non-conductive material. By providing a barrier between the worker and the floor, rubber mats can help prevent electrical shock, making them a vital safety feature in workshops, maintenance areas, and facilities where electrical equipment is in use.

Understanding this function underscores the importance of using rubber mats in specific scenarios related to electrical safety. While cushioning falls and providing support during maintenance work are also valuable considerations in workplace safety, these functions do not primarily define the role of rubber mats. Additionally, while marking safe areas can enhance overall safety, it is not a primary characteristic of rubber mats themselves.