Specifications

C•CURE apC/L Technical Manual
Using the Worksheet
B-6
Example calculation Using the Worksheet
This example shows you how to use the worksheet to make sure that your
RMs have adequate power. Suppose your installation uses 18 AWG wire to
connect two RMs to the apC/L. The first RM is 250 ft. from the apC/L. The
second RM is 500 ft. from the first. This is the same layout described in the
previous example using the wiring length tables.
To perform the example calculation:
1. Enter the wiring lengths in the blanks in the worksheet. Note that not all
spaces are filled in.
2. The wire resistance per foot for 18 AWG wire is 0.01277 ohm per foot.
3. The total voltage drop for this chain is 2.544. Since this is less than the 4.5
maximum, the wiring is adequate for this installation.
Table B.2 Sample Worksheet
RM# or
Input/
output
module
Current drawn
by module
Wire resistance
per ft.
Wire
length
from
previous
reader
Total voltage
drop of this
reader
2 X 0.2 X 0.01277 X 250 = 1.277
1 X 0.2 X 0.01277 X 500 = 1.277
Total Voltage drop for the chain of readers: 2.544
apcl.bk Page 6 Monday, May 15, 2000 3:21 PM