![]() In America, both AWG and SWG are written as #/#/# where # represents the gauge number. BWG is the Birmingham Wire Gauge and is used throughout most of Europe (except for Britain). SWG is the Standard Wire Gauge and is used in Britain. AWG is the American Wire Gauge and is used in America. There are three common types of SWG gauges: AWG, SWG, and BWG. The metric equivalent is called the British Standard Gauge (BSG). The higher the gauge number, the thinner the wire. ![]() The gauge system is used as a measure of how thick the wire is, either in terms of diameter or cross sectional area. The smallest AWG size is 40 and the largest is 0000 (4/0).īritish Standard Wire Gauge is a set of wire sizes that were established by the British Board of Trade in 1864. The larger the AWG number or wire gauge, the smaller the physical size of the wire. The American Wire Gauge (AWG) system is used in the United States to measure the diameter of nonferrous, electrically conducting wire. The larger the AWG number or wire guage, the smaller the physical size of t The table below can be used to determine the minimum wire size required to safely carry a certain amount of current over a given length of wire.Īmerican Wire Gauge (AWG), also known as the Brown and Sharpe wire gauge, is a standardized wire gauge system used in the United States for the diameters of round, solid, nonferrous, electrically conducting wire. Most electrical wire is AWG number 12 or 14. Wire size is specified by the American Wire Gauge (AWG). The table below shows approximate wattage ratings for common devices.ĭeviceWattage Ceiling fan75-225 Electronic game console150-300 Desktop computer50-250 Laptop computer25-100 Light bulb (incandescent)40-100 Light bulb (CFL or LED)5-15 Refrigerator250-750 This is important to know when choosing electrical wiring, as the wattage will determine the size of wire you need to use.įor example, a 100-watt light bulb will require a heavier gauge wire than a 10-watt night light. The wattage of a device is a measurement of how much power it uses. The National Electric Code (NEC) has requirements for wiring sizes to prevent fires.For example, a 120-volt circuits must use at least 14-gauge wire, and a 240-volt circuit must use at least 12-gauge wire. If too much current flows through a wire, it will overheat and could start a fire. The amperage is limited by the capacity of the wires in the circuit. The wattage is the amount of power that the devices use, and the voltage is the pressure that pushes the current through the circuit. The amperage of a circuit is determined by the wattage of the devices on the circuit and the voltage of the circuit. A larger wire can carry more current than a smaller wire. The size of the wire will determine the ampacity. Current is measured in amps, and the ampacity of a wire is the amount of current that it can carry safely. The amperage of a wire is the amount of current that it can carry. From there, it goes through a transformer to lower the voltage to a level that’s safe for use in your home. The electricity that powers your home is generated at a power plant, and then transmitted over high-voltage power lines to your neighborhood. If it’s outside of this range, you may have a problem with your electrical system. The actual voltage delivered to your home may be slightly higher or lower than this, but it should be within 10% of 120 V. This is also called “standard” or “nominal” voltage. In the U.S., the voltage used in most homes is 120 volts (V). The wire size most commonly used for 500 feet is 4/0 for 100-amp service or 2/0 for 200-amp service. The main service panel is generally rated for 30, 50, or 60 amps. Most houses are supplied with either 100-amp or 200-amp service. This guide will help you select the right size wire for your needs. If you’re looking to run 500 feet of wire, you’ll need to know what size to use.
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