3M 2475 - Manual (Page 9)

Performance Series Component Placement
5
Call Stations
For proper system operation, install the Call Stations in locations:
1. Chosen for ease of use.
2. At least 48 inches above the pavement.
Note
Local codes may dictate placement of call stations.
Figure 5. Suggested Call Station Placement
Station Selectors
For proper system operation, locate the Station Selectors:
1. At locations chosen for maximum efficiency.
2. On counters, mounted on pedestals, or mounted on walls.
3. In dry and heated areas.
Figure 6. Suggested Station Selector Station Placement