R 408.14493 Crucible and similar type furnaces.

Rule 4493. (1) Where a crucible or similar type furnace in a non-ferrous foundry is at floor level or below floor level, a grating must cover the opening, or it must be protected in compliance with General Industry Safety and Health Standard Part 2. “Walking-Working Surfaces,” being R 408.10201 to R 408.1024 of the Michigan Administrative Code. (2) Where crucible or similar type furnaces are above the floor level, they must be not less than 3 feet apart.