22
* Can be H or B
CAUTION: When sizing the wire, you must follow the guidelines of the
latest revision of the NEC. NM-B wire is e
q
uivalent to “Romex” cable.
S
EU
is e
q
uivalent to service entry cable. For NEC type NM-B wire, you must
size the wire using 60C ratings per NEC article 326.
* Minimum overcurrent protection per NEC 424-3b not to be less than
125% of total amps for fixed resistance heat.
Table 9a. Electrical Specifications
** Alternate wiring combinations can be used. Refer to the latest revision of the NEC for these
appropriate alternate combinations.
Wire Gauge
and Type
Breaker
Size
Wire Gauge and
Type
Breaker Size
#8 NM-B
40 amp
#10 NM-B
30 amp
#6
S
EU
60 amp
#10 NM-B
30 amp
#6
S
EU
60 amp
#10 NM-B
30 amp
#6
S
EU
60 amp
#6
S
EU
60 amp
#6
S
EU
60 amp
#6
S
EU
60 amp
#8
S
EU
50 amp
#8 NM-B
40 amp
Circuit "A"
Circuit "B"
E2E(*)-015HBR
Replacement furnace for E2E(*)-015HB
Model Number
E3E(*)
-012H
-015H
-017H
-020H
-023H
Table 9b. Recommended Electrical Application Guide
for Dual Circuit Installations**
Copper Wire Size - See
Caution Below
60°C
90°C
( e.g ., R o mex)
( e. g . , SE U )
-010-H
S
ingle
45.5
60
57
4
6
10
S
ingle
52.1
70
65
4
6
8
Dual "A"
28.0
40
35
8
8
10
Dual "B"
24.2
30
30
10
10
10
S
ingle
66.3
90
83
2
4
8
Dual "A"
45.5
60
56
4
6
10
Dual "B"
20.8
30
26
10
10
10
S
ingle
71.3
90
89
2
4
8
Dual "A"
48.8
60
60
4
6
10
Dual "B"
22.5
30
28
10
10
10
S
ingle
87.1
125
109
0
2
6
Dual "A"
45.5
60
57
4
6
10
Dual "B"
41.7
60
52
4
6
10
S
ingle
93.8
125
117
0
2
6
Dual "A"
52.1
60
60
4
6
10
Dual "B"
41.7
60
56
4
6
10
Copper Wire Size - See
Caution Below
60°C
90°C
( e.g ., R o mex)
( e. g . , SE U )
-010
S
ingle
47.7
60
57
4
6
10
S
ingle
54.3
70
67
4
6
8
Dual "A"
30.2
40
35
8
8
10
Dual "B"
24.2
30
30
10
10
10
S
ingle
66.0
90
83
2
4
8
Dual "A"
46.0
60
57
4
6
10
Dual "B"
20.0
30
25
10
10
10
S
ingle
71.5
90
89
2
4
8
Dual "A"
51.0
60
60
4
6
10
Dual "B"
22.5
30
28
10
10
10
S
ingle
86.0
125
109
0
2
6
Dual "A"
46.0
60
57
4
6
10
Dual "B"
40.0
60
50
4
6
10
Replacement furnace for E2E(*)-015HB
E2E(*)-
S
ingle
67.1
90
83
2
4
8
015HBR
Dual "A"
35.5
50
44
6
8
10
Dual "B"
31.7
40
39
8
8
10
Replacement
furnace fo r
E2E(*)-015HB
-020
-012
-015
-017
-012H
-015H
-017H
-020H
-023H
2-Wire
system
maximum
wire lengths:
24 Ga.= 55'
22 Ga.= 90'
20 Ga.= 140'
18 Ga.= 225'
4 or more
Wire
systems
maximum
wire lengths:
24 Ga.= 25'
22 Ga.= 45'
20 Ga.= 70'
18 Ga= 110'
Low
Voltage
Thermostat
Wire Size
Ground
Wire
Size
Minimum
Circuit
Ampacity
Maximum
Over-current
Rating
Total
Amperes
Supply
Circuit
Model
Number
E3E(*)
2-Wire system
maximum wire
lengths:
24 Ga.= 55'
22 Ga.= 90'
20 Ga.= 140'
18 Ga.= 225'
4 o r mo re
Wire systems
maximum wire
lengths:
24 Ga.= 25'
22 Ga.= 45'
20 Ga.= 70'
18 Ga= 110'
Ground
Wire
Size
Minimum
Circuit
Ampacity
Maximum
Over-current
Rating
Total
Amperes
Supply
Circuit
Model
Number
(E3EX)
Low
Voltage
Thermostat
Wire Size
