For instance, you can’t install a 30-AMP unit if your circuit breaker only allows for 15. While determining the correct wire gauge is essential, it’s crucial that you know your circuit breaker’s draw before buying your PTAC unit. These ratings are only for standard wires, which are typically made of copper or other non-metallic metals. The most common gauges are 2, 6, 8, 10, 12, and 14, but you can still find them in other sizes. On the other end of the spectrum, large electric furnaces and heaters are 60 AMPS and require 4-gauge cords. This chart outlines the AMP rating and the necessary corresponding wire gauge: AMPsįor comparison, your average table lamp is 10 AMPS and only requires an 18-gauge cord. This information will be printed on the information panel somewhere in your unit, along with the correct wire gauge. What Size Do I Need?Ĭhances are, your PTAC unit will have an AMP rating of either 15, 20, or 30. The ground wire isn’t included in the number of conductive wires.Īs an example, if the label says “10-2G,” that indicates that the cable is 10-gauge wire with two conductive wires along with a grounding wire. Next to that number, there might be an additional number, which indicates the number of conductive wires in the cable.įinally, the label might include “G,” which indicates that the cable contains a grounding wire. The first thing you’ll notice is a number-this is the gauge of the wire. The labels on your various cables can be confusing, as they often describe elements beyond the gauge of the wire itself. So, an 18-gauge wire would be much thinner than a 6-gauge wire. When it comes to wires, a higher number means a smaller wire diameter. 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. ![]() How are Wires Sized?Ī quick walk through the electrical department of your local hardware store will highlight just how many sizes of wires are available. When the PTAC unit is in your home, work with a lighter wire for convenience and aesthetics. ![]() Higher gauges are bulkier, stiffer wires that aren’t easily hidden or manipulated. Taking proper precautions now could save you later on.Ĭhoosing to use a larger gauge than the AMP rating calls for isn’t dangerous, but you might find it inconvenient. If you can’t avoid using one in your home, take the time to purchase one that matches or exceeds the AMP rating of your PTAC unit. Never plug your PTAC unit into a low-gauge extension cord or power strip. 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. Your circuit breaker simply can’t offer enough protection This excess heat can destroy the wire itself, damage the PTAC unit, or even cause a fire. The smaller wire can’t conduct the higher amperage properly, leading to excess heat in the wire. With any electrical project, it’s incredibly important to understand just how dangerous it can be to use a wire gauge that’s too small. ![]() A wire’s gauge is what determines exactly how much electricity can flow between the circuit breaker and the appliance. Gauge is a standardized method of measuring a wire’s diameter. How do you determine the correct wire gauge for 30 AMP units, among the others? We’ll take a closer look at everything you need to know in this guide. If the wires are too small for the amperage rating, excess heat can destroy them and pose a dangerous fire hazard. AMPs are the units used to measure electric current, and higher amperage ratings require larger wires. When it comes to wire gauges and AMP ratings for your PTAC unit, size is an important consideration.Įvery unit has an amperage (AMP) rating.
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