Rheem Warrior Series Use and Care Manual - Page 9

Branch Circuit Sizing and Wire Size Guide - codes

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Ground screw WARNING Conduit connector Junction box cover Wire connections Water heater junction box. CAUTION: The presence of water in the piping and water heater does not provide sufficient conduction for a ground. Non-metallic piping, dielectric unions, flexible connectors etc. can cause the water heater to be electrically isolated. Electrical Connections A separate branch circuit with copper conductors, overcurrent protective device and suitable disconnecting means must be provided by a qualified electrician. All wiring must conform to local codes or latest edition of National Electrical Code ANSI/NFPA 70. The water heater is completely wired to the junction box inside jacket at the top front of the water heater. An opening for 1/2″ or 3/4″ electrical fitting is provided for field wiring connections. The voltage requirements and wattage load for the water heater are specified on the rating plate on the front of the water heater. The branch circuit wiring should include either: Metallic conduit or metallic sheathed cable approved for use as a grounding conductor and installed with fittings approved for the purpose. Non-metallic sheathed cable, metallic conduit or metallic sheathed cable not approved for use as a ground conductor shall include a separate conductor for grounding. It should be attached to the ground terminals of the water heater and the electrical distribution box. 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. Branch Circuit Sizing and Wire Size Guide Total Water Heater Wattage Recommended Over Current Protection (fuse or circuit breaker amperage rating) Copper Wire Size AWG Based on N.E.C. Table 310-16 (75°C) 1500* 1700 2000 2500 3000 3500 3800 4000 4500 5000 5500 6000 9000 120V 20 20 25 30 35 208V 15 15 15 15 20 25 25 25 30 30 35 40 - 240V 15 15 15 15 20 20 20 25 25 30 30 35 50 120V 12 12 10 10 8 208V 14 14 14 14 12 10 10 10 10 10 8 8 - 240V 14 14 14 14 12 12 12 10 10 10 10 8 8 *Less than 1500 watts may be wired 14 gauge with 15 amp protection. Check Local Electrical Codes, as they will also apply. 9

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9
Branch Circuit Sizing and Wire Size Guide
Total Water
Recommended Over Current Protection
Copper Wire Size AWG Based
Heater Wattage
(fuse or circuit breaker amperage rating)
on N.E.C. Table 310-16 (75°C)
120V
208V
240V
120V
208V
240V
1500*
20
15
15
12
14
14
1700
20
15
15
12
14
14
2000
25
15
15
10
14
14
2500
30
15
15
10
14
14
3000
35
20
20
8
12
12
3500
–
25
20
–
10
12
3800
–
25
20
–
10
12
4000
–
25
25
–
10
10
4500
–
30
25
–
10
10
5000
–
30
30
–
10
10
5500
–
35
30
–
8
10
6000
–
40
35
–
8
8
9000
–
–
50
–
–
8
*Less than 1500 watts may be wired 14 gauge with 15 amp protection. Check Local Electrical Codes, as they will also apply.
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.
CAUTION: The presence of
water in the piping and water
heater does not provide
sufficient conduction for a
ground. Non-metallic piping,
dielectric unions, flexible
connectors etc. can cause the
water heater to be electrically
isolated.
Electrical Connections
A separate branch circuit with copper
conductors, overcurrent protective device
and suitable disconnecting means must be
provided by a qualified electrician.
All wiring must conform to local codes or
latest edition of National Electrical Code
ANSI/NFPA 70.
The water heater is completely wired to
the junction box inside jacket at the top
front of the water heater. An opening for
1/2
″
or 3/4
″
electrical fitting is provided
for field wiring connections.
The voltage requirements and wattage load
for the water heater are specified on the
rating plate on the front of the water heater.
The branch circuit wiring should include
either:
Metallic conduit or metallic sheathed
cable approved for use as a grounding
conductor and installed with fittings
approved for the purpose.
Non-metallic sheathed cable, metallic
conduit or metallic sheathed cable
not approved for use as a ground
conductor shall include a separate
conductor for grounding. It should be
attached to the ground terminals of
the water heater and the electrical
distribution box.
WARNING
WARNING
Water heater junction box.
Ground screw
Junction
box cover
Wire connections
Conduit
connector