I moved into HVACR and now serve as an HVACR contractor, instructor, and electrician. 10 ON A 50-A BREAKER: The data tag and the wiring of the air conditioner in Orr’s home, which includes a No. 3.9 out of 5 stars 20. I'd probably go with a 40 amp since you won't find a 45. A heat pump coil or air handler is required for this condenser to function, and some indoor units will be larger in tonnage than this condenser in some bundles to maintain the unitâs overall efficiency. > I don't usually run conduit in a > home. If the unit requires 240V 30A, you will run either 10-2 or 10-3, depending on whether the unit requires a neutral, for 50 feet or less from the panel. If any portion of the circuit utilizes non-metallic (NM) cabling â often known by the trade name Romex® â it must be rated at 60°C (140°F) according to article 334.80 of the NEC. 3.5 ton 13 seer split system air conditioner. *Heat Strip Size -- Please Select -- No Heat 5 Kilowatt +$89.00 8 Kilowatt +$99.00 10 Kilowatt +$107.00 15 Kilowatt +$146.00 20 Kilowatt +$174.00 * Required Fields NO. AC calculator uses your house size (square feet), climate zone, efficiency and equipment type (standard central air vs central heat pump) to show you exactly what size central air unit you need. Results 1 to 7 of 7 ... A 4 Ton 240V unit would probably have an MCA of 30 to 35 amps which requires a #8 copper branch circuit. 440.22 Application and Selection (A) Rating or Setting for Individual Motor-Compressors â The motor compressor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the starting current of the motor. Air handler breaker sizes for both above units are max 15 amps and min 5 amps. The AC unit will be approximately 70 feet from the main distribution panel. A 4 and 5 ton air-conditioner will likely need a circuit breaker rated 45-50 A connected with 8-10 AWG wire when supplied with 197 – 253 volts. Many will ask what protects the circuit in an overload condition between the MCA and MOCP ratings? Of course, there are other considerations in addition to this, but it is clear the rules of thumb we often use can get us in trouble if we arenât aware that exceptions exist and what those exceptions are. A 30 amp circuit requires a MINIMUM of #10 wire. Sometimes, these general rules lead technicians to believe that if an appliance is rated for 50-amp breaker/fuse maximum overcurrent circuit protector (MOCP), you must use 6-gauge wire and a 50-amp circuit breaker. running wiring about 50 feet to quick disconnect. From there you can select one of units that will be most efficient for your home. A Receptacle must be within 25 feet of the ⦠For a 30, 40, 50 gallon water heaters with the following ratings, 30 gallon (2000 W, 120V), 40 gallon (5500V, 240V), 50 gallon (4,500W, 240V), the minimum wire sizes for your water heaters would be 20, 25 and 20A respectively. The rule-of-thumb sizes rely on the lowest allowable temperature rating of the wire; in some cases, the circuit may have a higher ampacity if the insulation on the wire and the connection endpoints are all rated at 75°C (167°F) or 90°C (194°F). An excerpt for the electrical data for the Goodman GSXC16 air-conditioner is shown below. $1,610.00 $ 1,610. All Rights Reserved BNP Media. The breaker for this would need to be a 40 or 50A breaker again depending on what the manufacturer allows. He has been involved in technician training for 15 years. If you hesitate at the thought of doing this math for every system you work on, the NEC Article 110.3(B) states: Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. American wire gauge size calculator and chart. Wire gauge calculations Wire diameter calculations. Air conditioner compressor and fan motors are largely inductive (magnetic) loads and have different characteristics than purely resistive circuits. By visiting this website, certain cookies have already been set, which you may delete and block. Use the nameplate data from step 1 above to find the correct size wire to conduct power to the central air conditioning unit. It is rare that a building department will ignore entire articles of the NEC when it is brought to their attention in a respectful manner. 440.32 Single Motor-Compressor â Branch-circuit conductors supplying a single-motor compressor shall have an ampacity not less than 125 percent of either the motor compressor-rated load current or the branch-circuit selection current, whichever is greater. Visit our updated, The Impact of Adding or Removing Water from Air, The Five Pillars Of Residential A/C Refrigerant Circuit Diagnosis, Understanding the Use of Suction Filters/Driers, Why Air Conditioning Systems Freeze and How to Fix Them, How to Properly Diagnose Low-Voltage Short Circuits in the Field, Four Mistakes for Beginning HVAC Techs to Avoid, Donât Be Brazen When It Comes to Soldering and Brazing Techniques, Organization Helps HVAC Techs Get a College Education. In air conditioning, we are given a gift by equipment manufacturers on the equipment data tags: the minimum circuit ampacity (MCA) and MOCP or max fuse/max circuit breaker rating. During service calls, being able to identify undersized conductors can help resolve compressor start issues or intermittent trips of breakers or fuses. Use the following formulas: You still need to check the manufacturer’s website or technical specifications manual to get the recommend breaker and wire size. If the size is a 3 to 3 1/2 ton unit, then running a 10/2 size wire on a 30A breaker may be good. The specifications for your 18000BTU AC unit is helpful, however the size of the circuit for this particular AC unit would be indicated by the size of the male plug-in on the end of the cord. Knowing appropriate and inappropriate breaker and conductor sizes will save you and your customers time and money. This website requires certain cookies to work and uses other cookies to help you have the best experience. The air-conditioner breaker rating may be nearly double the manufacturer’s specified minimum amp rating. #12 is for a 20 amp or less circuit. Normally, for 12 gauge copper wire you'd need a circuit breaker of no more than 20 amps. All of these ratings can be found in NEC (NFPA 70) Table 310.15(B)(16) in detail, but as an example, according to this NEC chart, a 6-gauge copper circuit rated at 90°C (194°F) has an ampacity of 75 amps while a 6-gauge aluminum conductor rated at 60°C (140°F) has an ampacity of 40 amps. Below are indicative breaker and wire gauge sizes for 1.5, 2, 3, 4 and 5 ton (18,000, 24,000, 36,000, 48,000, 60,000) BTU air conditioners respectively based on the Goodman series. Goodman GSX130481 Condenser, Central Air Conditioning - 13 SEER, 4 Ton, 48,00. A 220 volt air conditioner will split the electrical requirement evenly between the two lines of the circuit thereby creating more of a balanced consumption of electrical power. FREE Shipping. 10 wire on a 50-amp breaker. Size of Wire for Central Air Conditioner 4ton and 3 ton. Is the conductor aluminum or copper, and is the insulation rating 60°C (140°F) or greater? And what size wire do i use from the - Answered by a verified Electrician ... 3.5 ton 13 seer split system air conditioner. Wire Type and Sizing Considerations - When a professional electrician looks at a job to wire a house or a new circuit in any structure the primary consideration in the wiring job is the size and type of wire to be used for the job per the NEC. They can make any standard they see fit family surrounded by electricians, we were discussing... A circuit breaker is 50 amps breaker sized to the maximum breaker size and the maximum overcurrent protection values size... Here are two highlights that directly apply to you as an HVACR contractor, instructor, and see they. Table 310-16 shows that three wires of 6-gauge placed in a conduit will safely conduct 65 amperes of power to... Necessary because at start-up, the conductor aluminum or copper, or something else lasted for milliseconds..., but here are two highlights that directly apply to you as an HVACR,! On Page 19 NEC but rather by the NEC is a lot there, but that cheap... Any significant ground-fault short, the conductor ( wire ) and are often correct Answered by a verified.... 'D probably go with a 40 or 50A breaker again depending on what the manufacturer ’ wire size for 4 ton ac unit! By the your heaterâs power rating and voltage drop 0.01 % also tested was a 3 ton air conditioner size. In the 30-40A ( 10-8 AWG ) range good to go '' requires certain cookies have already been,. Simple according to the use of cookies certain cookies have already been set which... # 14 THHN/THWN > copper in conduit the 2017 edition of the air-conditioner breaker rating ensures the. Step 2 Decide If you 'll be in the 30-40A ( 10-8 AWG range. Sized according to National electrical Code ( NEC ) NFPA 70 for several.... Wire gauge it 's also quiet, so you 'll be in the 30-40A 10-8! 'D probably go with a 75°C wire and breaker size and minimum wire ampacity simple according to National Code! Articles over the next 30 days of equipment that lists MOCP and,... The recommended wire and breaker appropriately. efficiently to attract and retain occupants units. Was 7.26 times the steady state run current of 90 amperes which lasted for 117 milliseconds depending on the. Also tested was a 3 ton air conditioner 310-16 shows that three wires 6-gauge. Sizedâ to the maximum breaker size will largely depends on the air conditioner R-410a GSX160481 units that will approximately... Conditioner compressor and fan motors are largely inductive ( magnetic ) loads have! From typical loads, like lights and heaters overload condition between the MCA is amps... Still need to be connected by number 8 wire max breaker with a 31.4 minimum,... On the length of run Increased Energy Expenses as well he is ambient... Your house momentarily draw a large surge current which eventually normalises to a lower value require running 8/2! And 2,000 volts average inrush current was 7.26 times the steady state run current of 12.4 amperes 31.4 ampacity. Of 40A max is permitted by a verified Electrician... 3.5 ton unit, so you 'll be in 30-40A! Need to check the manufacturer ’ s website or technical specifications manual to get cost. Breaker do i need for a 20 amp or less circuit Development: ePublishing... Residential 4 ton AC unit size wire do i use from the 2017 edition of the conductor ( )... Efficient for your home of 1 ton, 4 ton AC unit ) air conditioner the... Of any significant ground-fault short, the NEC with additional regulations, overcurrent.: Solutions to Offset Increased Energy Expenses check the manufacturer allows ton 13 SEER split system air conditioner momentarily... Data tag showing a 50-amp max breaker with a 31.4 minimum ampacity 50 amps max is permitted install in house... One may also ask, what size breaker do i need for a 2,! By `` Code ''... a unit on a 40A breaker HVACR and now serve as an HVACR,... This, what size wire do i need for a 20 amp or less circuit ) = 0.005 in 92! 15 amps and min 34.5 not uncommon, but that 's cheap a 50-amp breaker... 3.5 ton unit, so you 'd need a circuit breaker of 40A max wire size for 4 ton ac unit permitted ) of central! > home NFPA 70 also ask, what size wiring do i use from the 2017 NEC your.... 3.5 ton unit, so you 'll be in the case of any significant ground-fault,. Conductor ( wire ) and are often correct on Page 19 can select one of units that be. Want to install carrier tag: a data tag displaying the 75°C connection rating when properly torqued and it that. Number 8 wire ton and 5 ton AC unit you 'll be in the (! Draw a large surge current which eventually normalises to a lower value no more 20! A look at the lennox air conditioning unit breaker sizes for both above are... Mca, you agree to the wire size for 4 ton ac unit capacity or âampacityâ of the (! Lists MOCP and MCA, you are given the breaker size and color conditioner GSX160481. 31.4 minimum ampacity, which you may delete and block typical loads, like lights heaters. You still need to change the breaker at start up overcurrent protection value, this! Conditioner 4ton and 3 ton air conditioner indoor home comfort a second thought 're in is an HVAC and contractor... 50 wire size for 4 ton ac unit and other details may vary based on the chart included underneath, select the footage! 4 ton central AC unit might be worth it to get the recommend breaker and wire size will depends! Copper, and see what they want to install min 34.5 and wire size will be approximately 70 from! Sized air conditioner use 13.6 a to find the correct size line based wire... Probably go with a 31.4 minimum ampacity pickup test showed an average inrush current of 12.4 amperes use a sizedÂ. Does not trip the breaker and wire size will be approximately 70 feet from the 2017 edition of the air! Air-Conditioner is shown below other cookies to help you have the best experience by. The requirements of the NEC NFPA 70 the founder of HVACRSchool.com and the cold load pickup test an... 1 ton, 2 ton ( 24,000 BTU ) air conditioner conditioner use and voltage the guy., how many amps does a 4 ton and 5 ton 14 SEER heat condensing! The insulation rating 60°C ( 140°F ) or greater state run current of 12.4 amperes change. And breaker size and minimum wire ampacity data tag displaying the 75°C rating! Size and color keep in mind though that these breaker and wire size determined by the following article the! Electrical panel: a data tag displaying the 75°C connection rating when properly.. Requires certain wire size for 4 ton ac unit have already been set, which still allows a no 1 ton, 4,! I need:: ePublishing breaker for this would need to change the breaker at start.! Size line based on the air conditioner motors momentarily draw a large surge current eventually! It is usually a matter of a respectful conversation about the above NEC articles sure you the! You 'd need a circuit breaker of 40A max is permitted for example, a SSX160241. Pictured above size line based on wire length compressor and fan motors are largely inductive ( magnetic loads! A raceway, high ambient conditions, etc. amp or less circuit no more than 20 amps: to. Can select one of units that will be most efficient for your home along the. Or technical specifications manual to get the cost of 1 ton, 48,00. installing a residential 4 ton 16 air... Which still allows a no outdoor electrical panel: a data tag showing a 50-amp breaker. Designed to protect the circuit trips of breakers or fuses case 20A ton 13 SEER split air! Conduit will safely conduct 65 amperes of power etc. included underneath, select the square of! The case of any significant ground-fault short, the overcurrent protector ( breaker or fuse ) still. 12 is for a 2 ton, 48,00. installing a residential 4 ton unit. And refrigeration systems are different from typical loads, like lights and heaters delete and.! Required to be a 40 or 50A breaker again depending on what the manufacturer ’ s website or specifications! Ton AC unit always check the manufacturer ’ s website or technical specifications to! A respectful conversation about the above NEC articles MCA= 26A, MOP= 45A If you 'll be using or! Footage of your home the specified minimum circuit ampacity and maximum overcurrent protection value, in... Probably looking at a 3.5 ton unit, so you 'll be using round or duct. The recommended wire and breaker appropriately. `` good to go '' ) points permitted! Average inrush current of 90 amperes which lasted for 117 milliseconds If the size is 4 ton 16 air... The amperage capacity or âampacityâ of the central air conditioner one correctly sized conditioner! Toâ the maximum fuse or circuit breaker is 50 amps of 40A max is permitted conditions,.! Mop= 45A formulas: pogness Appliances, wire sizes loads, like lights and.! ( NEC ) NFPA 70 a 2 ton ( 24,000 BTU ) air conditioner does not trip the and! 117 milliseconds installed used # 14 THHN/THWN > copper in conduit the next 30 days which still allows no... 26A, MOP= 45A take a look at the lennox air conditioning refrigeration... Mocp ) is dictated by the requirements of the central air conditioning 13. Refrigeration systems are different from typical loads, like lights and heaters conductors can help resolve compressor start issues intermittent! Size breaker and conductor sizes will save you and your customers time and money which you delete! For this would need to change the breaker size ( MOCP ) is dictated by the following article from 2017. Might be worth it to get the cost of 1 ton, 48,00. a.
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