Specifications

Section 3: Installation Planning
3-7
 Readers mounted in metal enclosures must have a minimum of 3 inches (7.62 cm) clearance
on all sides.
 Avoid RF interference which may impair the sensor read range. Typical sources of interference
include:
 Air conditioning systems
 Arc welders
 Diathermy machines
 Electric motors
 Elevator lift motors
 Fluorescent lighting within 2 feet (61 cm)
 Industrial equipment
 Radio transmitters
 Relay panels
 Telephone company switching panels
 Coaxial connectors and coaxial shields must not be in contact with building metal construction
elements. All cable connectors should be insulated with shrink tubing or electrical tape.
 The seam between the reader and the wall or door on outdoor readers should be sealed with
silicone caulking. (This requirement does not apply to brick walls where trapped humidity
could damage the reader.)
 Readers must be accessible for maintenance and repair purposes.
 Reader height should be convenient for all command key holders, with consideration for those
with physical limitations.
The SE 2854/55 Medium Range Readers have the following additional location requirements:
 The distance from electrical wiring, electrical conduit, aluminum wall studs, or metal pipes is
increased to 12 inches (30 cm) as is the distance from metal beams.
 Readers must be located at a minimum of 12 inches (30 cm) away from metal beams.
A concealed reader must not be mounted behind rebar, wire mesh, a solid metal wall, a metal-
sheathed wall, foil-backed insulating batts, or a wall painted with a lead-based paint. In the case
of installations where it is absolutely necessary to locate a reader behind one of these types of
walls, a 14 X 14 inches (35.5 X 35.5 cm) section of the wall must be cut away and the reader
centered in this space.