House Wiring Circuits and Circuit Breakers More about Electrical Wiring for a Water HeaterĮlectrical Wire for Electrical Repairs and Home Remodel Projects
WATER HEATER CIRCUIT WITH 120 VOLT OUTLET CODE
If after replacing the circuit breaker it is found that the water heater trips the breaker then the circuit wiring and breaker should be increased and replaced, as long as the water heater is working properly and without fault.įrom the information you have provided and what the NEC code states, careful consideration should be given to installing the right circuit breaker as soon as possible for the right level of protection for this circuit. For example: If the existing cable is 12/2 Type-TN Copper with TW or THW insulation then a 2pole 25amp breaker would be correct. This way you are sure to protect the wire gauge of the circuit. The type of insulation of the existing #12 cable should be identified and compared to the NEC wire Table 310.16 to see what the allowed ampacity of the cable is, because that is one of the main factors that will determine the amount of heat that is allowed for that type of insulation.īased upon this information, the existing circuit breaker should be replaced with one that is correct for the existing installation. Now lets consider this Water Heater Circuit Installation You have stated that the calculated amperage load for 4500watt at 240volts is 18.75amps, however NEC Article 422.13 states that the minimum circuit rating for a water heater must be 125% of the rated load, so this 4500watt load requires a minimum circuit of 23.44 amps at 240volts.
I agree with you that this water heater circuit is not a typical configuration, and the common circuit for a new home is #10 copper wire protected by a 2pole 30amp circuit breaker, however lets look at this application carefully.įirst, lets start with the NEC Code for this Water Heater Application This electrical wiring project is about Changing the Wiring for a Water Heater in a Home Electrical Wiring and Circuit Breaker for a Water Heater A permit and inspections may also be required.
WATER HEATER CIRCUIT WITH 120 VOLT OUTLET INSTALL
This electrical wiring project is best performed by a Licensed Electrical Contractor or Certified Electrician.Įlectrical Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, and appropriate Safety Gear.Įstimated Time: Depends on the personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.Įlectrical Safety: Identify the electrical power source to the Water Heater, turn it OFF and Tag with a Note before working with the electrical wiring.Įlectrical Wiring Parts and Materials: Electrical parts and materials for the Water Heater should be approved for the specific project and compliant with local and national electrical codes.Įlectrical Codes and Inspections: Installing or changing home electrical wiring should be done according to local and national electrical codes as adopted in Fairfield, Ohio. Wiring for a 240Volt Electric Water Heater Thanks for your electrical wiring question John, the following will assist you with your electrical question. This electrical wiring question came from John, a Handyman in Fairfield, Ohio. A new electrical school graduate recently replaced the the original panel with the same breaker and cable combo (made no change), and has convinced the neighbor this configuration is “OK.”Also, the neighbor believes since nothing “bad” has happened in the several year period he has lived in this home (with the same configuration), nothing will happen in the future.Gratefully if you would respond with any advice that could help me convince this neighbor to replace his current breaker and cable with #10-wire and 25A or 30A breaker, if you agree with that.
My electrical wiring project involves Change the Wiring a Water Heater in the Bathroom of a Mobile Home. What is the right circuit breaker and cable for an electric water heater? This electrical wiring project is about the Electrical Wiring for a Water Heater in a Home.Įlectrical Question: What is the right circuit breaker and cable for an electric water heater?
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