Edwards Signaling 5541M-Y6 - Manual (Page 27)

P/N 3100471 ISSUE 3 PAGE 27
Quantity of Individual Total Current Draw
Audio Audio Amplifiers [1] Amplifier Current (quantity x Amplifier current in mA)
Amplifier Draw (mA)
Form B
5532M
Total current draw for all amplifiers =
[1] See Appendix C for the maximum number of amplifiers supported by the panel.
5532M Audio Amplifier Voltage Drop Calculation
Circuit length (single conductor) Total Circuit Wire resistance Voltage
current to unit per 1000 ft [1] drop
feet x 2 x Amps X ohms /1000 =
Audio output from panel or Voltage drop End of line
previous unit's End of line circuit voltage [3]
- =
Voltage drop Audio output from Voltage
panel or previous unit's drop %
end of line circuit [2]
/ =
Panel
2 mA 2 mA 2 mA
I total = 6 mA
Panel Audio
Ouput Voltage
Unit
End of Line Voltage
1 2 N
Unit N
End of Line Volta
Voltage drop between
Unit 1 and Unit N Voltage drop between
Panel and Unit 1
Example -- Determine voltage drop from Panel to Unit 2
Steps
1. Obtain single conductor wire legnth from Panel to Unit 2.
2. Obtain total circuit current from Panel's audio output
3. Using wire type from below and table from above, calculate voltage drop to Unit 2.
4. Unit 2 End of Line Voltage = Panel Audio Output or Previous Unit's End of Line Voltage - Unit 2 Voltage Drop
Notes
[1] Use 1.6 for 12 AWG and 2.5 sq mm wire, 2.6 for 14 AWG and 1.5 sq mm wire, 4.2 for 16 AWG and 1.0 sq mm wire and 6.6
for 18 AWG and 0.75 sq mm wire
[2] Panel audio output voltage is 10.6V
rms
[3] In order to produce a minimum 75 dBA output, voltage should not be less than 9V
rms