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A #10 copper wire with an insulation rating of 90 degree C is rated at 30 amps. If the heaters exact draw is 30 amps then go to the next wire size. That will be a #8 copper wire with an insulation rating of 90 degree C and it is rated for 45 amps.

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15y ago
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4mo ago

For a 30 amp heater, you would typically need a wire gauge of 10 AWG (American Wire Gauge) to safely carry the current without overheating. It is important to always check the manufacturer's specifications and local electrical codes to determine the exact wire gauge needed for your specific installation.

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12y ago

This will depend upon how many watts your water heater is rated for, as well as its voltage rating. Some smaller ones may be rated at 3800 watts, which means it is drawing about 15.8 amps (assuming a 240 volt circuit). In this case a 20 amp, double pole breaker can be used and #12 copper wire. Larger heaters are rated at 4500 watts, which means it is drawing 18.75 amps (again, assuming a 240 volt circuit). In this case, a 25 or 30 amp, double pole breaker can be used and #10 copper wire. Remember that an electric water heater is considered a "continuous load", which means that it can run for three hours or longer at a time. Since this is the case, one should never load it's circuit more than 80%. This means that a 20 amp circuit should never be loaded with a load greater than 16 amps; a 25 circuit, with more than 20 amps; and a 30 amp circuit, with more than 24 amps. Also, some heaters are rated for 120 volts, which means that your amps will increase, but only a single pole breaker is needed. Always check your heater's nameplate to see what it is rated for. To calculate, divide your watts by your voltage. This will give you the amps being drawn. Also, if your heater has two elements, they are rated the same, but an internal relay switch prevents them from operating at the same time. So, there is no need to add the two together to get your load calculation. You may have two 3800-watt elements, but the heater is just rated at 3800 watts, not 7600 watts.

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Q: Wire gauge required for 30 amp heater?
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What gauge wire and amp breaker do you use on a stove dryer and hot water heater?

For a stove, use a 8 or 6 gauge wire with a 40 to 50 amp breaker. For a dryer, use a 10 or 8 gauge wire with a 30 amp breaker. For a hot water heater, use a 10 or 8 gauge wire with a 30 or 40 amp breaker. Be sure to consult local electrical codes and guidelines for specific requirements.


What size wire should be used to connect a water heater from the panel?

A 10-gauge wire is typically used for a 30-amp circuit required for a water heater. However, it's essential to consult the manufacturer's instructions or an electrician for the specific wire size needed based on the water heater's specifications and local electrical codes.


What is the amp rating of NM wire?

The amp rating of NM (Non-Metallic) wire varies depending on the gauge of the wire. For example, a 14-gauge NM wire typically has an amp rating of 15 amps, while a 12-gauge NM wire has an amp rating of 20 amps. It is important to consult local building codes and regulations to determine the appropriate wire gauge and amp rating for specific applications.


What is the amp size of a 8 wire?

The amp size of a wire is determined by its gauge, not the number of wires. An 8-gauge wire is typically rated for around 40-60 amps, depending on the type and insulation of the wire.


What size wire and breaker do you need for a 5000 watt garage heater?

Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker

Related questions

What gauge wire and amp breaker do you use on a stove dryer and hot water heater?

For a stove, use a 8 or 6 gauge wire with a 40 to 50 amp breaker. For a dryer, use a 10 or 8 gauge wire with a 30 amp breaker. For a hot water heater, use a 10 or 8 gauge wire with a 30 or 40 amp breaker. Be sure to consult local electrical codes and guidelines for specific requirements.


What gauge wire is required for 15 amp service?

14-2


What is the maximum breaker size for these gauges wire?

You listed no gauge wire. This is the required breakers.14 gauge - 15 amp12 gauge - 20 amp10 gauge - 30 amp8 gauge - 40 amp


What is the wire size required for 1800 watts for lamps?

14 gauge will handle it with a 15 amp breaker. If you use 12 gauge use a 20 amp breaker.


What size wire should be used to connect a water heater from the panel?

A 10-gauge wire is typically used for a 30-amp circuit required for a water heater. However, it's essential to consult the manufacturer's instructions or an electrician for the specific wire size needed based on the water heater's specifications and local electrical codes.


What gauge wire required to go 50 feet for a 100 amp service?

AWG # 4 copper.


What is the amp rating of NM wire?

The amp rating of NM (Non-Metallic) wire varies depending on the gauge of the wire. For example, a 14-gauge NM wire typically has an amp rating of 15 amps, while a 12-gauge NM wire has an amp rating of 20 amps. It is important to consult local building codes and regulations to determine the appropriate wire gauge and amp rating for specific applications.


What is the maximum breaker size for these gaug?

You listed no gauge wire. This is the required breakers.14 gauge - 15 amp12 gauge - 20 amp10 gauge - 30 amp8 gauge - 40 amp


What size gauge wire for 4000w amp?

on a 4000 watt amp the best gauge wire woul be between 2 and 0


What is the amp size of a 8 wire?

The amp size of a wire is determined by its gauge, not the number of wires. An 8-gauge wire is typically rated for around 40-60 amps, depending on the type and insulation of the wire.


What size wire and breaker do you need for a 5000 watt garage heater?

Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker


Is it safe to use 10 gauge wire on a 20 amp breaker for a microwave?

No, 10 gauge wire requires the use of a 30 amp breaker. A 20 amp breaker is only used on 12 gauge wire.