This is a department rule and informational note in addition to the requirements in ANSI/ASHRAE standard 15 section 8.12: An eye wash and body shower unit shall be located external to the machinery room and be readily accessible.
Wis. Admin. Code Department of Safety and Professional Services SPS 345.508
It is recommended that additional such units be located accessibly within the machinery room such that no unit is further than 50 feet from any point in the room.