A.O. Smith DSE-5 Instruction Manual page 11

Not More Than Three Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)
Size
60°C
(140°F)
TYPES
AWG
RUW, T
TW, UF
MCM
18 ......
16 ......
14 15
12 20
10 30
8 40
6 55
4 70
3 80
2
1
0
00
000
0000
250
300
350
400
500
Ambient
For ambient temperatures over 30°C, multiply the ampacities shown by the appropriate correction factor to determine the maximum
Temperature
allowable load current.
°C
31-40 .82
41-50 .58
51-60 ......
61-70 ......
71-80 ......
= The load current rating and the overcurrent protection for these conductors shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10
AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum.
Immersion
standard number of 50a contractors
heaters***
kw
no. of
ratings
208V
wattage
3 1 3,000
6 1 6,000 1
9 1 9,000
12 1 12,000
15 1 15,000
18* 1 18,000
24 2 12,000 2
30 2 15,000
36* 2 18,000
45 3 15,000 3
54 3 18,000
60** 4 15,000 4
75** 5 18,000 5
90** 5 18,000
* 208V models use one additional immersion heater.
** Available on 50 gallon models or larger.
*** Each immersion heater contains three electric elements.
Allowable Ampacities of Insulated Conductors
Temperature Rating of Conductor
75°C 85°C
(167°F) (185°F)
TYPES
FEPW
RH, RHW
RUH, TYPES SIS, =FEP,
THW, V, MI
THWN,
XHHW
USE, ZW =XHHW*
COPPER
...... ......
...... 22
15 25
20 30
30 40
45 50
65 70
85 90
100 105
115 120
130 140
150 155
175 185
200 210
230 235
255 270
285 300
310 325
335 360
380 405
CORRECTION FACTORS
.88 .90
.75 .80
.58 .67
.35 .52
...... .30
standard kw Inputs
240V 480V
1
1
2
3
2
4
5 3
taBle 1.
90°C 60°C
(194°F) (140°F) (167°F)
TYPES
TYPES
TA, TBS
RH, RHW
SA, AVB
TYPES
RUW, T THW,
=FEPB,
TW, UF THWN
=RHH,
XHHW,
=THHN,
ALUMINUM OR COPPER-CLAD ALUMINUM
21 ......
22 ......
25 ......
30 15
40 25
50 30
70 40
90 55
105 65
120 75
140
155
185
210
235
270
300
325
360
405
.91 .82
.82 .58
.71 ......
.58 ......
.41 ......
taBle 2.
full load current In amperes
single phase
208V 240V 277V
14.4 12.5 10.8
28.8 25.0 21.2
43.3 37.5 32.5
57.7 50.0 43.3
72.1 62.5 54.2
86.5 75.0 65.0
115.4 100.0 86.6
144.2 125.0 108.3
173.1 150.0 130.0
216.3 187.5 162.5
N/A 225.0 194.9
N/A 250.0 216.6
N/A N/A N/A
N/A N/A N/A
11
75°C 85°C 90°C
(185°F) (194°F)
TYPES
TA, TBS,
RUH SA, AVB
TYPES
SIS,
V, MI
=RHH,
=THHN,
USE =XHHW*
...... ...... ......
...... ...... ......
...... ...... ......
15 25 25
25 30 30
40 40 40
50 55 55
65 70 70
75 80 80
90 95 95
100 110 110
120 125 125
135 145 145
155 165 165
180 185 185
205 215 215
230 240 240
250 260 260
270 290 290
310 330 330
.88 .90 .91
.75 .80 .82
.58 .67 .71
.35 .52 .58
...... .30 .41
three phase
480V 208V
6.3
8.3
12.5 16.7
18.8 25.0
25.0 33.3
31.3 41.6
37.5 50.0
50.0 66.6
62.5 83.3
75.0 99.9
93.8 124.9
112.5 149.9
125 166.7
156 208.4
188 250
Size
AWG
MCM
......
......
......
12
10
8
6
4
3
2
1
0
00
000
0000
250
300
350
400
500
Ambient
Temperature
°F
86 –104
105–122
123–141
142–158
159–176
240V 480V
7.2 3.6
14.4 7.2
21.7 10.8
28.9 14.4
36.1 18.0
43.3 21.7
57.7 28.9
72.2 36.1
86.6 43.3
108.3 54.1
129.9 65.0
145 72
181 90
217 108