Appendix B: Worksheets
P/N 3102351-EN • REV 005 • ISS 28DEC18 195
The power type reflects the type of power supplied to the NAC terminals at minimum voltage.
The current draw of notification appliances can vary substantially with the type of power
supplied: full-wave rectified (VFWR) or regulated and filtered DC (R&F). It is important to know
the power type at minimum terminal voltage.
You’ll need to calculate the following values relating to your power supply and to the NAC
circuit current. These are:
• Minimum voltage
• Voltage drop
The minimum voltage is the lowest voltage measured at the NAC terminals when the power
supply is under the maximum load for that circuit (i.e., for the appliances that constitute the
NAC.)
The voltage drop is the difference between the minimum voltage and 18.4 V for the RZI16-2
24V IN. This value is for use with this worksheet only.
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