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3.3
Power Cabling Guide
Use the following formulas and tables 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)
= 7.4 for aluminum (KS20189)
DC Wire size requirements
Output
Current Rating
10A
20A
30A
40A
Table 2 – Recommended wire size Table
Calculating Wire Size Requirements
A
CMA
Note:
AC wiring terminals can accept wire up to 12 AWG;
DC wiring terminals can accept wire up to 10 AWG;
Alarm wiring terminals can accept wire up to 16 AWG.
Recommended
wire size (AWG)
#14
#12
#10
#8
LF
K
AVD
CMA
MaxAmp
LF
SIZE
(AWG)
18
16
14
12
10
8
Table 3 - Wire Size/Area Table
Calculating Current Carrying Capacity of Wire
AVD
K
AREA
SIZE
CIR.MILS
(AWG)
CIR.MILS
1620
6
2580
4
4110
3
6530
2
10380
1
16510
0
AREA
26240
41740
52620
66360
83690
105600
8
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