Voltage Drop Calculation

[akrajib143]

Hi,
I am facing a problem regarding voltage drop calculation for notification devices of NFS2-3030 Panel. NFS2-3030 panel has no any NAC. so we used Control / Relay Module for Sounder/Bell. For NAC voltage drop calculation formula is Total Amp (Bell) X Resistance in ohm per 1000 feet X 2 X Total Length of the sounder Circuit / 1000 feet.
Total Length of sounder circuit is NAC to Last souder/Bell.
But I want to whenever I use Control / Relay Module Total length of sounder circuit will be Panel to Control/Relay Module or Panel to Control/Relay Module + Module to Bell.

Let me know ASAP.

Thanking You
Enamul