La Marche AUPS-2K-A1-ABD1-24V150A, Installation And Operation Manual

Page: 13 / 49

7
2.4 Making the DC Input/Battery Connections
Before making any of DC input connections, make sure you have read and fully understand the DC Connection
Procedure below. Ensure that the Battery breaker is set to the OFF position. Select proper size for the DC wiring
from Table 4. If the distance between the systems DC input and the battery exceeds 10 feet, use the Power
Cable Guide below to minimize the voltage drop across the wire distance.
Power Cabling Guide
Use the following formulas and table to determine proper wire size for minimal voltage drop.
Table of Conventions
CMA = Cross section of wire in circular MIL area
A = Ultimate drain in amperes
LF
= Conductor loop feet
MaxAmp = Maximum allowable amperes for given voltage drop
AVD
= Allowable voltage drop
K = 11.1 for commercial (TW) copper wire (KS5482-01)
= 17.4 for aluminum (KS20189)
Calculating Wire Size Requirements
AVD
K LF A
CMA
 

Calculating Current Carrying Capacity of Wire
K LF
AVD CMA
MaxAmp



2.4.1 DC Input/Battery Connection Procedure
Run the battery wiring to terminals marked positive (+) and negative ( – ) on the terminal block TB4 inside the
system.
CAUTION:
The AUPS has a Reverse Polarity LED indicator and will illuminate if the batteries are
connected in reverse polarity. Do not close/turn on ANY of the DC breakers or damage to the AUPS
will occur.
SIZE
(AWG)
AREA
CIR.MILS
SIZE
(MCM)
AREA
CIR.MILS
18 1620 250 250000
16 2580 300 300000
14 4110 350 350000
12 6530 400 400000
10 10380 500 500000
8 16510 600 600000
6 26240 700 700000
4 41740 750 750000
3 52620 800 800000
2 66360 900 900000
1 83690 1000 1000000
0 105600 1250 1250000
00 133100 1500 1500000
000 167800 1750 1750000
0000 211600 2000 2000000
Table 5 - Wire Size/Area Table
Figure 4 – DC Input/Battery Connection