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Connect tankless to main breaker box |
| Use only 600 volt wire. Lamp cord, extension cords are not rated 600 volt. Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional. 30 amp breaker use 10 gauge /  Buy: 10-2 gauge/ 30 amp 10-3/ 30 amp Southwire electric tools |
Yellow
12 gauge 20 amp Yellow/ #12 gauge wire for 20 amp with ground Buy: 12-2 gauge/ 20 amp 12-3/ 20 amp NMB is house wiring UF is underground Rolls of stranded wire |
White
14 gauge 15 amp White/ #14 gauge wire for 15 amp with ground Buy: 14-2 gauge/ 15 amp 14-3/ 15 amp NMB is house wiring UF is underground |
 Buy: Armored cable |
 Southwire armored cable cutter Buy: Rolls of stranded wire |
Stranded wire  Buy: Rolls of stranded wire |
50-60
amp breaker use 6 gauge /  Buy: 6-2 wire Southwire electric tools NMB is house wiring UF is underground |
40-50
amp breaker use 8 gauge / Buy: 8-2 wire Southwire electric tools NMB is house wiring UF is underground |
  Copper ground wire Use same size as other wire in circuit Buy: 12 gauge copper ground wire Ground wire Green ground wire Ground pigtails Ground rods/ ground clamps at Amazon |
 Buy End cutting nippers at Amazon |
  When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point. Buy tools: Wire strippers at Amazon Linesman pliers Utility knife at Amazon |
 Buy: Multimeter Electrical testers |
 Buy circuit breakers Eaton CL series circuit breaker CH circuit breakers at Amazon Federal Pacific circuit breaker QO circuit breakers at Amazon |
 Buy circuit breakers Choose from 15 to 125 amp Siemens circuit breaker GE circuit breakers at Amazon |
How many breakers? What size
breakers? -Breakers must match the same brand as main panel. -Applies to 240 volt single-phase tankless water heaters Look at label located on side of tankless unit for volts and watts. Watts divided by volts = amps -Look at product manual or spec sheet for description of wiring: for example 3 x 50 means three 50 amp breakers. 2 x 40 means two 40 amp breakers. -Each breaker supplies power to one element. Each element will have a set of two terminals. Wire from one breaker cannot be split to supply more than 1 element. -Look at screw terminals located inside unit to determine how many wires are needed: 2 terminals= 1 wire, 4 terminals = 2 wires. 6 terminals = 3 wires |
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Screws on
main breaker are HOT at all times Even when main breaker is OFF, both screws on the main breaker are HOT DO NOT touch main breaker screws at any time unless meter is pulled To replace main breaker, power company must unlock metal band around meter and pull out the meter. Resource: What causes electrocution? Electric safety |
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Three 50 amp 240Volt breakers Use 50 amp breaker with 6 gauge wire No difference if all breakers on same side of panel, or on different sides. Requires 250 amp service and 250 amp main breaker. Ground wire must be connected to ground busbar Resource Wire size chart Main breaker Stress test Buy: Circuit breakers at Amazon Shop Amazon - Industrial Electric Products |
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