![]() To protect the 8 AWG wire used for supplying electricity to the 5 ton AC, use the circuit breaker with a current rating as what is indicated on the maximum overcurrent protection device. Note: The NEC 2020 code only requires that the wire gauge match the specified minimum current rating and does not need to match the maximum overcurrent circuit breaker rating on the nameplate. Note: The wire gauge rating assumes a temperature of 75 ☌. Īlways refer to this minimum ampacity rating and cross reference this against the NEC 2020 table indicating the nearest wire gauge can handle the AC’s minimum ampacity rating. Note this is subject to the specified maximum ampacity value on your AC model’s nameplate. You’ll probably need 8 AWG wire (8/2) for a 5 ton AC condenser unit assuming the AC unit has a minimum ampacity of about 36 amps connected to a 208-230V single-phase power supply. Wire Gauge and Circuit breaker Rating for a 5-ton AC Refer to the owner manual for your AC model’s cooling capacity. The estimated cooling capacity of a 4 ton AC is about 48,000 BTU/hr. You can use a power meter to determine your AC’s actual power consumption in watts. This is indicative and your AC’s actual power consumption will depend on its energy efficiency rating and the user settings such as fan speed. The estimated power consumption of a 4 ton AC is about 4,800 watts. This is only rated and the actual current draw depends on whether the is in the initial phase of starting up or later and the current load on the AC.Īt startup, the AC’s condenser motors can have a momentary initial current draw several times more than the rated current draw before it reduces to its rated current draw. The estimated current draw of a 4 ton AC, using a single phase 208- 230V supply is 21 amps. If the nameplate specifies a maximum overcurrent protection device rating of 50 amps then use a 50 amp circuit breaker. To protect the 10 AWG wire used for supplying electricity to the 4 ton AC, use the circuit breaker with a current rating as what is indicated on the maximum overcurrent protection device. The indicative wire gauge to use with a 4-ton AC condenser unit, connected to a 208 -230V single-phase power supply is 10 AWG (10/2) assuming its minimum ampacity rating (specified on its ampacity rating) is 30 amps.Īlways refer to this minimum ampacity rating and cross reference this against the NEC 2020 table indicating the nearest wire gauge that can handle the AC’s minimum ampacity rating. The specified maximum overcurrent current protection fuse or circuit breaker rating in amps should be the basis for selecting the circuit breaker rating for an AC Use its minimum ampacity rating specified in (amps) as a guide in selecting a suitable wire gauge for the AC. Wire Gauge and Circuit breaker Rating for a 4-ton ACĮach AC manufacturer is required to include on its nameplate found on the condenser its minimum ampacity rating (amps) and the maximum overcurrent current protection fuse or circuit breaker (amps). Should you use a Dedicated or Shared circuit for a 4-ton and 5-ton AC?.What Wire Gauge and Circuit Breaker Rating (amps) for 1.5, 2, 3, 4, and 5 Ton AC?.Wire Gauge and Circuit breaker Rating for a 5-ton AC.Wire Gauge and Circuit breaker Rating for a 4-ton AC.
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