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13
NOTICE: This guide recommends minimum branch circuit sizing and wire size based on National Electric Code. Refer to
wiring diagrams in this manual for field wiring connections.
*277V is for single phase installation only.
For two independent branch circuits installation, both branch circuits must be sized
according to the table.
Branch Circuit Sizing and Wire Size Guide, For ELD(S) 30, 40, and 52 Models
Single Phase
Non-Simultaneous
or
Three phase
Non-Simultaneous
Single Phase
Simultaneous
Wiring
3 Phase
Simultaneous
Wiring
Element
Wattage
Recommended Over Current Protection
(Fuse or Circuit Breaker Amperage Rating)
Copper Wire Size AWG Based on NEC
Table 310.15 (B)(16)
(formerly Table 310.16)
208V 240V 277V* 480V 208V 240V 277V* 480V
3,000 20 20 15 15 12 12 14 14
4,000 25 25 20 15 10 10 12 14
4,500 30 25 20 15 10 10 12 14
5,000 30 30 25 15 10 10 10 14
5,500 35 30 25 15 8 10 10 14
6,000 40 35 30 20 8 8 10 12
Total
Element
Wattage
Recommended Over Current Protection
(Fuse or Circuit Breaker Amperage Rating)
Copper Wire Size AWG Based on NEC
Table 310.15 (B)(16)
(formerly Table 310.16)
208V 240V 277V 480V 208V 240V 277V 480V
6,000 40 35 30 20 8 8 10 12
8,000 50 45 40 25 8 8 8 10
9,000 60 50 45 25 6 8 8 10
10,000 60 60 45 30 6 6 8 10
11,000 70 60 50 30 4 6 8 10
12,000 80 70 60 35 4 6 6 8
Total
Element
Wattage
Recommended Over Current Protection
(Fuse or Circuit Breaker Amperage Rating)
Copper Wire Size AWG Based on NEC
Table 310.15 (B)(16)
(formerly Table 310.16)
208V 240V 277V 480V 208V 240V 277V 480V
6,000 35 30 NA 15 8 10 NA 14
8,000 45 40 NA 20 8 8 NA 12
9,000 50 45 NA 20 8 8 NA 12
10,000 60 45 NA 25 6 8 NA 10
11,000 60 50 NA 25 6 8 NA 10
12,000 70 60 NA 30 6 6 NA 10
Installing the water heater.
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