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* 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 equivalent to “Romex” cable. SEU
is equivalent 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 fi xed resistance heat.
Table 9a. Electrical Specifi cations
** Alternate wiring combinations can be used. Refer to the latest revision of the NEC for these
appropriate alternate combinations.
Table 9b. Recommended Electrical Application Guide
for Dual Circuit Installations**
Model
Number
E3E(*)
Supply
Circuit
Total
Amperes
Maximum
Over-current
Rating
Minimum
Circuit
Ampacity
Copper Wire Size - See
Caution Below
Ground
Wire
Size
Low
Voltage
Thermostat
Wire Size
60°C
(e.g., Romex)
90°C
(e.g., SEU)
-010H
Single 45.5 60 57 4 6 10
2-Wire system
maximum wire
lengths:
24 Ga.= 55'
22 Ga.= 90'
20 Ga.= 140'
18 Ga.= 225'
-012H
Single 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
-015H
Single 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
-017H
Single 71.3 90 89 2 4 8
Dual "A" 48.8 60 60 4 6 10
4 or more
Wire systems
maximum wire
lengths:
24 Ga.= 25'
22 Ga.= 45'
20 Ga.= 70'
18 Ga= 110'
Dual "B" 22.5 30 28 10 10 10
-020H
Single 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
-023H
Single 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
Model
Number
E3EX
Supply
Circuit
Total
Amperes
Maximum
Over-current
Rating
Minimum
Circuit
Ampacity
Copper Wire Size - See
Caution Below
Ground
Wire
Size
Low
Voltage
Thermostat
Wire Size
60°C
(e.g., Romex)
90°C
(e.g., SEU)
-010
Single 47.7 60 57 4 6 10
2-Wire system
maximum wire
lengths:
24 Ga.= 55'
22 Ga.= 90'
20 Ga.= 140'
18 Ga.= 225'
-012
Single 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
-015
Single 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
-017
Single 71.5 90 89 2 4 8
4 or more
Wire systems
maximum wire
lengths:
24 Ga.= 25'
22 Ga.= 45'
Dual "A" 51.0 60 60 4 6 10
Dual "B" 22.5 30 28 10 10 10
-020
Single 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(*)-
015HBR
Single 67.1 90 83 2 4 8
Replacement
furnace for
E2E(*)-015HB
Dual "A" 35.5 50 44 6 8 10
Dual "B" 31.7 40 39 8 8 10
Circuit "A" Circuit "B"
Model Number
E3E(*)
Wire Gauge
and Type
Breaker
Size
Wire Gauge
and Type
Breaker
Size
-012H #8 NM-B 40 amp #10 NM-B 30 amp
-015H #6 SEU 60 amp #10 NM-B 30 amp
-017H #6 SEU 60 amp #10 NM-B 30 amp
-020H #6 SEU 60 amp #6 SEU 60 amp
-023H #6 SEU 60 amp #6 SEU 60 amp
Replacement furnace for E2E(*)-015HB
E2E(*)-015HBR #8 SEU 50 amp #8 NM-B 40 amp