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Installation Requirements
Grounding Requirements
Voltage Requirements and Distance
1–18
NOTE
UL Listed Panic hardware shall be used to allow emergency exit from a
protected area.
Grounding requirements are as follows:
Use 3-conductor minimum 18 gauge AC ground wire
Ensure that the iSTAR eX controller is properly connected to an earth ground at the
ground stud near the AC input wiring.
Ensure that the shield wire is grounded to the nearest earth/ground connection at one end
only of the cable.
Disconnect the ground wire last to provide maximum protection to the equipment and
personnel.
To operate properly, each reader must conform to voltage requirements.
A standard RM Series Reader or RM-4 board requires at least 7.5 volts.
An RM-4E board requires at least 11 volts.
The iSTAR eX supplies 12 volts at its connectors; however, the amount of voltage that reaches
the reader is impacted by the following:
– Number of devices on the bus
– Current draw of each device
– Distance between devices
– Distance between the device and iSTAR eX
– Wire gauge that connects the devices
– State of the battery
To determine the maximum distance of an RM reader from an iSTAR eX, calculate the voltage
that reaches each reader. If the voltage is insufficient, you can shorten the wire length, use a
heavier wire, or add a UL294 power-limited power supply.
Wire resistance is as follows:
• 24 AWG = 26.0 Ω per 1000 ft.
• 22 AWG = 16.5 Ω per 1000 ft.
• 18 AWG = 6.5 Ω per 1000 ft.
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