30 Amp Water Heater Wire Size

At the water heater the black circuit wire connects to the black wire lead on the water heater and the.

30 amp water heater wire size. First lets start with the nec code for this water heater application 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. It is made specifically for all types of trailers and recreational vehicles. Multiply the value for current by 125 percent to determine the size of the breaker you need for the heater. Wire a hot water heater with wire that s sized to accommodate the heater s current requirement.

For an rv a 30 amp power service is a 120 volt with a three prong male cable and an assigned 30 amp breaker. Some large heaters draw up to 50 amps requiring 6 gauge wire. When placing multiple heaters on a circuit do not exceed the wattage listed for the corresponding wire and circuit breaker size. A water heater of this type is required to be considered a continuous load meaning that the branch circuit needs to be calculated at 125 of the heater s rated ampacity.

Electric water heaters require a 240 volt dedicated circuit which serves only the water heater and no other appliances or devices. For example plugging a heater rated for 20 amps into a 15 amp circuit wired with 14 gauge wire poses a distinct danger. For example a 20 amp hot water heater needs 12 gauge wire a 25 amp hot water heater requires 10 gauge wire and a 30 to 40 amp hot water heater requires 8 gauge wire. 2 1000w 1 1500w 240v heaters 3500 watts total.

4500 240 18 75 amps will work on a 20 amp ocpd but 18 75 125 23 4 amps requires a 25 or 30 amp circuit. If you have a 30 amp breaker right for your air conditioner water heater or clothes dryer that needs to be wired but you are clueless about what size of the wire gauge is needed allow us to help you out with not just that but also in understanding the basics involving wire gauges. The circuit wiring typically includes a 30 amp double pole breaker and 10 2 non metallic nm or mc cable. The standard 30 amp plug is often designated as tt 30p and tt 30r by american national standard institute.

Should the circuit breaker fail to operate correctly that heater will draw more current than the wires can safely handle and could heat the wires to the point of melting the insulation around the wires and igniting. The original 240 volt 30 amp hot water 10 gauge circuit wires will need to be verified that they are not being used for some other purpose. Thus the current draw for a 1 500 watt heater is 12 5 amps.