Alpha Technologies Cordex CXPS-D 48-2500_5000A - Manual (Page 41)

 -5HY%
6. Installation - AC, DC and Grounding Cables
This section provides cabling details and notes on cable sizing for DC applications with respect to the Alpha
CXPS-D 48 Power System.
• Only qualified personnel should install and connect the power components within the Alpha power system.
• All wiring must be in accordance with applicable electrical codes.
• A low voltage disconnect (LVBD) should be provided with the battery system.
• Electrical codes require that conductors carrying AC current be installed separately from conductors carry-
ing DC current and signals.
6.1 Installation Notes
6.1.1 Installer Responsibility
The system arrives pre-wired, and the installer is responsible for connecting the following:
• Utility input to the system
• Battery strings
• System to the load
• Chassis and battery return to the reference ground
6.1.2 Calculating Output Wire Size Requirements
$OWKRXJK'&SRZHUZLULQJDQGFDEOLQJLQWHOHFRPPXQLFDWLRQDSSOLFDWLRQVWHQGWRH[
FHHGHOHFWULFDOFRGHUHTXLUHPHQWVPRVWO\GXHWRWKHYROWDJHGURSUHTXLUHPHQWVDOO
DSSOLFDEOHHOHFWULFDOFRGH V WDNHSUHFHGHQFHRYHUWKHJXLGHOLQHVDQGSURFHGXUHVLQWKH
SUHVHQWFKDSWHUZKHUHYHUDSSOLFDEOH
Wire size is calculated by first determining the appropriate maximum voltage drop requirement. Use the formula
below to calculate the circular mil area (CMA) wire size requirement. Determine the size and number of conduc-
tors required to satisfy the CMA requirement.
CMA = (A x LF x K) / AVD
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 installation application. Consult
local electrical codes (NEC, CEC, etc.) for guidelines. If required, increase the size of the cable to meet the code.
Refer to Table D for cable size equivalents.