{"id":4061,"date":"2020-08-20T02:08:00","date_gmt":"2020-08-20T02:08:00","guid":{"rendered":"http:\/\/ptac4less.local\/?p=4061"},"modified":"2026-10-21T17:30:30","modified_gmt":"2026-10-21T17:30:30","slug":"wire-gauges-amp-ratings","status":"publish","type":"post","link":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/","title":{"rendered":"The Complete Guide to Wire Gauges \/ AMP Ratings for Package Terminal Air Conditioners"},"content":{"rendered":"\n<div class=\"ptac-tldr\" style=\"border:1px solid #cfe5de;border-radius:6px;background:#f4faf8;padding:18px 22px;margin:0 0 28px\"><p style=\"margin:0 0 8px;font-weight:700;color:#10304F\">TL;DR<\/p><ul style=\"margin:0;padding-left:20px\"><li>Match the wire gauge to the PTAC&#8217;s amp rating: 15 amps needs 14-gauge wire, 20 amps needs 12-gauge wire and 30 amps needs 10-gauge wire.<\/li><li>Wire that is too small for the amperage can overheat, destroy the wire, damage the PTAC unit or even cause a fire.<\/li><li>In the American Wire Gauge system, a higher number means a smaller wire diameter, so 18-gauge wire is much thinner than 6-gauge wire.<\/li><li>Check the circuit breaker before buying a PTAC. A 30-amp unit cannot be installed on a circuit breaker that only allows for 15 amps.<\/li><\/ul><\/div>\n\n\n\n<p>When it comes to wire gauges and AMP ratings for your PTAC unit, size is an important consideration.<\/p>\n\n\n\n<p>Every unit has an amperage (AMP) rating. AMPs are the units used to measure electric current, and higher amperage ratings require larger wires. If the wires are too small for the amperage rating, excess heat can destroy them and pose a dangerous fire hazard.<\/p>\n\n\n\n<p>How do you determine the correct wire gauge for 30 AMP units, among the others? We\u2019ll take a closer look at everything you need to know in this guide.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is a Wire Gauge?<\/h2>\n\n\n\n<p>Gauge is a standardized method of measuring a wire\u2019s diameter. A wire\u2019s gauge is what determines exactly how much electricity can flow between the circuit breaker and the appliance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Does the Wire Gauge Matter?<\/h2>\n\n\n\n<p>With any electrical project, it\u2019s incredibly important to understand just how dangerous it can be to use a wire gauge that\u2019s too small. The smaller wire can\u2019t conduct the higher amperage properly, leading to excess heat in the wire. This excess heat can destroy the wire itself, damage the PTAC unit, or even cause a fire. Your circuit breaker simply can\u2019t offer enough protection<\/p>\n\n\n\n<p>The chance of a fire or other electrical problems is commonly increased by plugging high AMP appliances into strips or extension cords that have a lower wire gauge. Never plug your PTAC unit into a low-gauge extension cord or power strip. If you can\u2019t avoid using one in your home, take the time to purchase one that matches or exceeds the AMP rating of your PTAC unit. Taking proper precautions now could save you later on.<\/p>\n\n\n\n<p>Choosing to use a larger gauge than the AMP rating calls for isn\u2019t dangerous, but you might find it inconvenient. Higher gauges are bulkier, stiffer wires that aren\u2019t easily hidden or manipulated. When the PTAC unit is in your home, work with a lighter wire for convenience and aesthetics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How are Wires Sized?<\/h2>\n\n\n\n<p>A quick walk through the electrical department of your local hardware store will highlight just how many sizes of wires are available. While it may seem overwhelming at first glance, the American Wire Gauge (AWG) system has standardized wire sizing, making it simple to find what you need.<\/p>\n\n\n\n<p>When it comes to wires, a higher number means a smaller wire diameter. So, an 18-gauge wire would be much thinner than a 6-gauge wire.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Understanding Labels<\/h3>\n\n\n\n<p>The labels on your various cables can be confusing, as they often describe elements beyond the gauge of the wire itself.<\/p>\n\n\n\n<p>The first thing you\u2019ll notice is a number\u2014this is the gauge of the wire. Next to that number, there might be an additional number, which indicates the number of conductive wires in the cable.<\/p>\n\n\n\n<p>Finally, the label might include \u201cG,\u201d which indicates that the cable contains a grounding wire. The ground wire isn\u2019t included in the number of conductive wires.<\/p>\n\n\n\n<p>As an example, if the label says \u201c10-2G,\u201d that indicates that the cable is 10-gauge wire with two conductive wires along with a grounding wire.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Size Do I Need?<\/h2>\n\n\n\n<p>Chances are, your PTAC unit will have an AMP rating of either 15, 20, or 30. This information will be printed on the information panel somewhere in your unit, along with the correct wire gauge.<\/p>\n\n\n\n<p>This chart outlines the AMP rating and the necessary corresponding wire gauge:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><strong>AMPs<\/strong><\/th><th><strong>Wire Gauge<\/strong><\/th><\/tr><\/thead><tbody><tr><td>10 AMPs<\/td><td>16-gauge wire<\/td><\/tr><tr><td>15 AMPs<\/td><td>14-gauge wire<\/td><\/tr><tr><td>20 AMPs<\/td><td>12-gauge wire<\/td><\/tr><tr><td>30 AMPs<\/td><td>10-gauge wire<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>For comparison, your average table lamp is 10 AMPS and only requires an 18-gauge cord. On the other end of the spectrum, large electric furnaces and heaters are 60 AMPS and require 4-gauge cords. The most common gauges are 2, 6, 8, 10, 12, and 14, but you can still find them in other sizes.<\/p>\n\n\n\n<p>These ratings are only for standard wires, which are typically made of copper or other non-metallic metals.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A Note About Your Circuit Breaker<\/h3>\n\n\n\n<p>While determining the correct wire gauge is essential, it\u2019s crucial that you know your circuit breaker\u2019s draw before buying your PTAC unit. For instance, you can\u2019t install a 30-AMP unit if your circuit breaker only allows for 15. Your circuit breaker would require extensive rewiring to increase the AMP rating to accommodate the new unit.<\/p>\n\n\n\n<p>The opposite scenario is much easier to handle. If you have a 30-AMP circuit breaker but want to install a 20-AMP unit, the wire will still be able to handle that level of an electrical draw. However, you will need to change the circuit breaker and the outlet for your new unit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Else Should I Consider?<\/h2>\n\n\n\n<p>In addition to the wire gauge, there are a few other characteristics to keep in mind when selecting wire for your PTAC unit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material<\/h3>\n\n\n\n<p>Most\u2014but not all\u2014wires are made of copper, silver, or brass. If you use a cord made from a different material, do some extra research to see if you need a different gauge than what\u2019s considered standard. It\u2019s important to familiarize yourself with the right numbers for your cord to reduce the risk of overloading the wire.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Length<\/h3>\n\n\n\n<p>In some cases, the length of your cord may affect the gauge you need to use. This is particularly true if your PTAC unit is more than 100 feet from the plug, or if the cord is going to be clustered among many others.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Solid or Stranded<\/h3>\n\n\n\n<p>Some wire is stranded, or woven, which can facilitate a better electrical pull than solid wire. However, solid wire is considerably easier to work with and is commonly found in many household cables.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Final Thoughts<\/h2>\n\n\n\n<p>Choosing the correct wire gauge for the AMP rating of your PTAC unit will help keep your unit running at peak performance while reducing the risk of a fire. If you have further questions about the safety of the electrical work for your PTAC unit or around your home, consult an experienced electrician who can personally evaluate and advise you on the situation.<\/p>\n\n\n\n<p>Want more insight and advice on purchasing and installing PTAC units?&nbsp;<a href=\"https:\/\/ptac4less.com\/contacts\">Contact us<\/a>&nbsp;today and let us know how we can help.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">Frequently Asked Questions<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1792598866662\"><strong class=\"schema-faq-question\">What gauge wire do I need for a 30 amp PTAC?<\/strong> <p class=\"schema-faq-answer\">A 30 amp PTAC needs 10-gauge wire. The PTAC&#8217;s amp rating is printed on the information panel somewhere on the unit.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792598866663\"><strong class=\"schema-faq-question\">What wire gauge goes with a 15 or 20 amp PTAC unit?<\/strong> <p class=\"schema-faq-answer\">A 15 amp PTAC needs 14-gauge wire and a 20 amp PTAC needs 12-gauge wire. Most PTAC units have an amp rating of 15, 20 or 30.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792598866664\"><strong class=\"schema-faq-question\">What happens if the wire gauge is too small for a PTAC?<\/strong> <p class=\"schema-faq-answer\">Wire that is too small cannot conduct the higher amperage properly, which leads to excess heat in the wire. That heat can destroy the wire, damage the PTAC unit or even cause a fire.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792598866665\"><strong class=\"schema-faq-question\">What does a wire label like 10-2G mean?<\/strong> <p class=\"schema-faq-answer\">A label of 10-2G means the cable is 10-gauge wire with two conductive wires plus a grounding wire. The first number is the gauge, the second is the number of conductive wires and &#8220;G&#8221; means a ground wire is included. The ground wire is not counted in the number of conductive wires.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792598866666\"><strong class=\"schema-faq-question\">Can I install a 30 amp PTAC on a 15 amp circuit breaker?<\/strong> <p class=\"schema-faq-answer\">No. A 30-amp PTAC cannot be installed on a circuit breaker that only allows for 15 amps. Increasing the circuit&#8217;s amp rating would take extensive rewiring.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792598866667\"><strong class=\"schema-faq-question\">Does wire length affect the wire gauge a PTAC needs?<\/strong> <p class=\"schema-faq-answer\">Wire length can affect the gauge needed in some cases. Length matters most if the PTAC unit is more than 100 feet from the plug or if the wire is clustered among many others.<\/p> <\/div><\/div>\n\n\n\n<div class=\"ptac-related\" style=\"border:1px solid #cfe5de;border-radius:6px;background:#f4faf8;padding:18px 22px;margin:0 0 28px\"><p style=\"margin:0 0 8px;font-weight:700;color:#10304F\">Related reading<\/p><ul style=\"margin:0;padding-left:20px\"><li><a href=\"\/blog\/ptac-sizing-and-power-how-to-match-units-to-your-hotels-electrical-system\/\">PTAC Sizing and Power: How to Match Units to Your Hotel\u2019s Electrical System<\/a><\/li><li><a href=\"\/blog\/what-size-ptac-unit-do-you-need-the-btu-sizing-guide-for-properties-and-facilities\/\">What Size PTAC Unit Do You Need? The BTU Sizing Guide for Properties and Facilities<\/a><\/li><li><a href=\"\/blog\/replacing-and-choosing-the-ideal-ptac-unit\/\">Replacing and Choosing the Ideal PTAC Unit<\/a><\/li><li><a href=\"\/blog\/selecting-the-best-ptac\/\">Ultimate Guide to Selecting the Perfect PTAC Unit<\/a><\/li><\/ul><\/div>\n","protected":false},"excerpt":{"rendered":"<p>TL;DR Match the wire gauge to the PTAC&#8217;s amp rating: 15 amps needs 14-gauge wire, 20 amps needs 12-gauge wire and 30 amps needs 10-gauge &#8230; <a title=\"The Complete Guide to Wire Gauges \/ AMP Ratings for Package Terminal Air Conditioners\" class=\"read-more\" href=\"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/\" aria-label=\"Read more about The Complete Guide to Wire Gauges \/ AMP Ratings for Package Terminal Air Conditioners\">Read more<\/a><\/p>\n","protected":false},"author":8,"featured_media":4062,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-4061","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-base","infinite-scroll-item","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Complete Guide to Wire Gauges \/ AMP Ratings for Package Terminal Air Conditioners | Ptac4Less<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Complete Guide to Wire Gauges \/ AMP Ratings for Package Terminal Air Conditioners | Ptac4Less\" \/>\n<meta property=\"og:description\" content=\"TL;DR Match the wire gauge to the PTAC&#8217;s amp rating: 15 amps needs 14-gauge wire, 20 amps needs 12-gauge wire and 30 amps needs 10-gauge ... 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Reed"},{"@type":"Question","@id":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866662","position":1,"url":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866662","name":"What gauge wire do I need for a 30 amp PTAC?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A 30 amp PTAC needs 10-gauge wire. The PTAC's amp rating is printed on the information panel somewhere on the unit.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866663","position":2,"url":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866663","name":"What wire gauge goes with a 15 or 20 amp PTAC unit?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A 15 amp PTAC needs 14-gauge wire and a 20 amp PTAC needs 12-gauge wire. Most PTAC units have an amp rating of 15, 20 or 30.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866664","position":3,"url":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866664","name":"What happens if the wire gauge is too small for a PTAC?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Wire that is too small cannot conduct the higher amperage properly, which leads to excess heat in the wire. That heat can destroy the wire, damage the PTAC unit or even cause a fire.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866665","position":4,"url":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866665","name":"What does a wire label like 10-2G mean?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A label of 10-2G means the cable is 10-gauge wire with two conductive wires plus a grounding wire. The first number is the gauge, the second is the number of conductive wires and \"G\" means a ground wire is included. The ground wire is not counted in the number of conductive wires.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866666","position":5,"url":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866666","name":"Can I install a 30 amp PTAC on a 15 amp circuit breaker?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No. A 30-amp PTAC cannot be installed on a circuit breaker that only allows for 15 amps. Increasing the circuit's amp rating would take extensive rewiring.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866667","position":6,"url":"https:\/\/ptac4less.com\/blog\/wire-gauges-amp-ratings\/#faq-question-1792598866667","name":"Does wire length affect the wire gauge a PTAC needs?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Wire length can affect the gauge needed in some cases. Length matters most if the PTAC unit is more than 100 feet from the plug or if the wire is clustered among many others.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/posts\/4061","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/comments?post=4061"}],"version-history":[{"count":2,"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/posts\/4061\/revisions"}],"predecessor-version":[{"id":4827,"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/posts\/4061\/revisions\/4827"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/media\/4062"}],"wp:attachment":[{"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/media?parent=4061"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/categories?post=4061"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ptac4less.com\/blog\/wp-json\/wp\/v2\/tags?post=4061"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}