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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)
AWG
TYPES
RUW, T
MCM
TW, UF
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 deter-
Temperature
mine the maximum 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
Heaters***
KW
Ratings
No. Of Wattage
3
1
6
1
9
1
12
1
15
1
18*
1
24
2
30
2
36*
2
45
3
54
3
60**
4
75**
5
90**
5
* 208V models use one additional immersion heater.
** Available on 50 gallon models or larger.
*** Each immersion heater contains three electric elements.
Table 3. Allowable Ampacities of Insulated Conductors
Temperature Rating of Conductor
75°C
85°C
(167°F)
(185°F)
TYPES
FEPW
RH, RHW
RUH,
TYPES
THW,
V, MI
THWN,
XHHW
USE, ZW
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
.88
.90
.75
.80
.58
.67
.35
.52
......
.30
Table 4. Standard kW Inputs
208V
240V
3,000
14.4
12.5
6,000
28.8
25.0
9,000
43.3
37.5
12,000
57.7
50.0
15,000
72.1
62.5
18,000
86.5
75.0
12,000
115.4
100.0
15,000
144.2
125.0
18,000
173.1
150.0
15,000
216.3
187.5
18,000
N/A
225.0
15,000
N/A
250.0
15,000
N/A
N/A
18,000
N/A
N/A
90°C
60°C
(194°F)
(140°F)
(167°F)
TYPES
TYPES
TA, TBS
RH, RHW
SA, AVB
TYPES
SIS, =FEP,
RUW, T
=FEPB,
TW, UF
=RHH,
XHHW,
=THHN,
=XHHW*
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
CORRECTION FACTORS
.91
.82
.82
.58
.71
......
.58
......
.41
......
Full Load Current In Amperes
Single Phase
277V
480V
10.8
6.3
21.2
12.5
32.5
18.8
43.3
25.0
54.2
31.3
65.0
37.5
86.6
50.0
108.3
62.5
130.0
75.0
162.5
93.8
194.9
112.5
216.6
125
N/A
156
N/A
188
12
75°C
85°C
90°C
(185°F)
(194°F)
TYPES
TA, TBS,
RUH
SA, AVB
TYPES
THW,
SIS,
V, MI
THWN
=RHH,
=THHN,
USE
=XHHW*
ALUMINUM OR COPPER-CLAD ALUMINUM
......
......
......
......
......
......
......
......
......
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
208V
240V
8.3
7.2
16.7
14.4
25.0
21.7
33.3
28.9
41.6
36.1
50.0
43.3
66.6
57.7
83.3
72.2
99.9
86.6
124.9
108.3
149.9
129.9
166.7
145
208.4
181
250
217
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
480V
3.6
7.2
10.8
14.4
18.0
21.7
28.9
36.1
43.3
54.1
65.0
72
90
108
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