Alpha Technologies 32-0-10A Fuse Panel - Manual (Page 12)

A RGUS T ECHNOLOGIES 32-0-10A F USE P ANEL
020-103-C0 R EV B P AGE 4 of 6
4 W
IRING
This chapter provides cabling details and notes on cable sizing for DC application
with respect to the Argus 32-0-10A Fuse Panel.
4.1 Calculating Wire Size Requirements
The cable chosen for use in power plant applications not only has to meet the re-
quirements of the electrical code for ventilated cable tray installations, ampacity and
cable type. The cable size must also be carefully selected to ensure minimum voltage
drop across its length when fully loaded. Keeping the voltage drop to a minimum
insures maximum back-up time and best performance when the system is operating
on battery.
The formula below can be used to calculate the cable size using typical voltage drop
recommendations for Telecom installations.
CMA = (A x LF x K) / AVD, where:
CMA = Cross section of wire in circular MIL area
A = Ultimate drain in amps
LF = Conductor loop feet
K = 11.1 constant factor for commercial (TW type) copper wire
AVD = Allowable voltage drop
Check again that the ampacity rating of the cable meets the requirement for the in-
stallation application. Consult local electrical codes (NEC, CEC, etc.) for guidelines.
If required, increase the size of the cable to meet the code.
4.2 Load Fuse Connections
Each load fuse corresponds to a unique numbered position on the load distribution
terminal blocks located at the rear of the unit (see Figure 2). Outline Drawing 020-
103-06 shows the numbering, front and rear.
Also refer to guidelines supplied with the load equipment. Typically distribution ca-
bles are sized to provide a 0.5V loop drop at full load as well as meeting ampacity
requirements of the protection fuse or circuit breaker.
WARNING Wiring of fuse connections should not exceed more
than maximum total current capacity. See specifica-
tions section in this manual.
The panel is equipped with a #6-32x⅜” pan head screw at each termination. Connect
“hot” leads to the corresponding numbered terminals and common leads to the
ground bar.
Figure 2–Rear view showing connections for loads and ground
Refer to the previous
(Installation) chapter
for safety precautions
and tools required.
Schematic (drawing)
020-103-05 shows the
internal routing detail
depending on the
options chosen.
GROUND BAR
LOAD CONNECTIONS