Calculations C
VES, LLC
Elite-RS Panel Installation Manual
VF3529-00, Revision E01.03
H-Series
99 of 146
3
Identify the maximum resistance of the wire gage used in the circuit (R
wiremax
) when using 18 AWG copper.
An 18 AWG solid copper wire is 6.385 Ohms at 1000FT using the Resistance Table below:
4
The calculation for the minimum output voltage of the NAC is:
V
outmin
= V
panel
X 85%
= 24 VDC X 85%
5
The calculation for voltage-drop across the length of the wire is:
V
drop
= V
outmin
- V
opmin
= 20.4 VDC - 16 VDC
6
The calculation for maximum wire length of this circuit is:
L
max
= 1/2 ( V
drop
/ I
max
) / R
wire
where,
= 1/2 [ ( 4.4 / .6286 ) / ( .006385 Ohms / FT ) ]
Gage
Resistance / 1000Ft @ 68F
R
wire
18 AWG
6.385 Ohms
0.006385
Ohms / FT
16 AWG
4.016 Ohms
0.004016
Ohms / FT
14 AWG
2.525 Ohms
0.002525
Ohms / FT
V
outmin
= 20.4 VDC
V
drop
= 4.4 VDC
L
max
= 548 FT