Sageon II 200A (N+1) Power Distribution System
Installation
PM990-5202-200, Rev. 6
2-3
1.
Calculate the minimum circular mils (CM) required for copper wire using the following formula:
22.2 x I x L
CM =
V
where:
CM = minimum area of circular mils in the cable
I = maximum current (in amps)
L = one-way cable length (in feet)
V = allowable loop voltage drop (in volts)
Example: Assume a maximum output current of 100 amperes, an allowable loop voltage drop of
0.25 volts, and a distance of 50 feet between the Sageon 200A and the load.
I = 100 amperes
L = 50 feet
V = 0.25 volts
(22.2)(100)(50)
CM =
(0.25)
CM = 440,000
2.
After calculating the minimum circular mils, select the proper copper wire size from Table 2-1;
always choosing the next larger wire size if the resistance rating falls between values. For the above
example, select 500 MCM wire.
3.
Determine the minimum wire size for ampacity according to the code authority having jurisdiction in
your location.
4.
Select the larger of the sizes calculated for voltage drop or ampacity.
TABLE 2-1 WIRE SIZING
SIZE
AWG NO.
AREA
IN CM
CURRENT
CARRYING
CAPACITY*
DIA BARE
COND
INCHES
RHW DIA
OVER INS
INCHES
RHW
BEND
RADIUS
INCHES
RHW NET
WEIGHT
PER 1000 FT
IN POUNDS
RHW MAX
SHIP
LENGTHS
PER REEL IN
FEET
OPEN
AIR
ENCLOSED
14
12
10
8
6
4
2
1/0
2/0
4/0
350 MCM
500 MCM
750 MCM
4,110
6,530
10,380
16,510
26,250
41,740
66,370
105,500
133,100
211,600
350,000
500,000
750,000
15
20
30
45
70
100
135
185
210
300
425
525
660
15
20
30
45
65
85
115
150
175
230
310
380
475
0.064
0.081
0.102
0.146
0.184
0.232
0.292
0.373
0.418
0.528
0.681
0.814
0.998
0.19
0.21
0.24
0.31
0.40
0.45
0.51
0.63
0.68
0.78
0.98
1.12
1.34
0.95
1.05
1.20
1.55
2.00
2.25
2.55
3.15
3.40
3.90
4.90
5.60
6.70
26
35
49
84
126
190
278
443
540
814
1,310
1,815
2,700
5,000
3,000
3,000
3,000
2,000
1,500
1,000
1,000
1,000
1,000
750
500
360
* Data based on NEC Handbook 1993, Table 310-17 adjusted for 50°C (122°F) ambient temperature.
