It is mandatory to procure user consent prior to running these cookies on your website.This website uses cookies to improve your experience while you navigate through the website. Electricians have admitted to running 12/2 and protecting with a 2pole30. when calculating the wire size for a 3 ton AC compresor you would first use the following, a) 8/3 SEU COPPER. Yep, I've been told that there's nothing worse than a 70+ year old stubborn inspector... no idea where that attitude originates, but I've been told Location south shore, MA. Therefore, large wire is required. Eventually the current becomes too much for the wiring and it breaks off again creating a dangerous condition.The equipment or device being supplied electricity from this wire, when it breaks, ceases to function while a live wire is hanging inside a control panel or other panel. Wire pulling tape/wire fishing tape. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment.Necessary cookies are absolutely essential for the website to function properly.
V. vino82 Member. 2 liquid-tight flex connectors. But opting out of some of these cookies may have an effect on your browsing experience.This website uses cookies to improve your experience.
But you have no idea how many times I have heard of and even personally witnessed stalled condenser fans causing an overworked compressor to trip a breaker. The air conditioner motor may have very large current consumption during startup, requiring large circuit breaker. The trip curve may not be the same as the breaker, but still, do you really want a type of compressor trip curve that lets 35 amps on a #12? Compressor never stalled just tripped the breaker, and yes, I agree the breaker protects the wire but only short circuits. Wire nuts.
But then in the field they may elect to use a larger size conductor. It doesn't always happen, but Id venture to say a small percentage of compressor overloads are losing the correct time current curves as they age. For years now I run 10/2 to my AC condensers on a 240v 30a breaker.
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. Which I install accordingly instead of the 2pole30. You must log in or register to reply here. For years now I run 10/2 to my AC condensers on a 240v 30a breaker. B)NEC table 9 ,AC Resistance. Thread starter vino82; Start date Jul 20, 2014; 1; 2; 3; Next. These links will lead to you purchase a product from another company. 2 cable connectors. For years now I run 10/2 to my AC condensers on a 240v 30a breaker. Thanks again.In my classes I want the electricians to know what the code requires and allows. Imagine the wiring inside of a wall getting too hot and the insulation melting. Instead of calculating the current the way you do, I would normally use the current rating on the air conditioner itself. I think I will approach wiring size in the future appropriate to the nameplate rating while considering length of the run. Eventually, the corrosion and the excessive heat will cause the wire to become brittle. I have noticed lately that some condensers have max overcurrent protection size of 25a.
Next Last. Still running the 10/2.
I have noticed lately that some condensers have max overcurrent protection size of 25a. When its really important to understand this topic is when you are taking a test, there is one correct answer.Be prepared to "teach" your inspector. We also use third-party cookies that help us analyze and understand how you use this website. This causes the wire to become smaller and the heat increases. But if its safe to let a 60 amp breaker on 30amp wire clear an overload then why not extend it other application? Did compressor stall in those cases? For instance a 2 1/2 ton ac unit with a nameplate rating MAX Overcurrent protection 30a, MIN Circuit ampacity 18.7a Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Yes, absolutely safe. With a 18.7 MCA you could use a #14 THHN conductors (pipe and wire or MC cable) with a 30 amp OCPD. Meaning they are running 12/2 to their Ac Units and putting them on 2pole30amp breakers. NM cable would require #12 AWG conductors. AWG 12, solid copper building wire, green or bare. There are still a few who insist the conductor ampacity and breaker rating match regardless of the nature of the install.
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