Trystan Casey
In electrical engineering, LEG is an acronym for London Electricity Group. In the context of residential power, a leg refers to one of the two wires supplying power to a home's main panel, each carrying 120 volts. These two legs together supply 240 volts to the home. A dead leg refers to a loss of power in one of these legs, resulting in a partial power outage. Switch leg wiring is a common issue in homes, where a wall switch doesn't seem to control anything. This is often due to switch leg wiring configurations, which allow homeowners to control plugged-in devices with a wall switch.
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What You'll Learn
LEG is an acronym for London Electricity Group
The London Electricity Group (LEG) was a British electricity company that was established in 1947 under the Electricity Act. It was responsible for the generation, transmission, and distribution of electricity in London and some surrounding areas. Over the years, LEG underwent various restructurings and mergers, and it eventually became part of the French energy company EDF Energy.
LEG played a significant role in the history of electricity supply in London. It was responsible for managing the complex network of power stations, substations, and transmission lines that provided electricity to homes and businesses in the region. The company also had to navigate the challenges of an aging infrastructure and the increasing demand for electricity as London grew and developed.
One of the notable achievements of LEG was its contribution to the development of the National Grid. The National Grid is a high-voltage transmission network that connects power stations and demand centers across the country, allowing for a more efficient and reliable supply of electricity. LEG was instrumental in the early stages of the National Grid's development, and it continued to play a key role in its expansion and improvement over the years.
Today, the legacy of LEG can still be seen in the electricity infrastructure of London and the surrounding areas. While the company no longer exists under that name, its contributions helped shape the modern energy landscape of the region, ensuring a stable and reliable supply of electricity for millions of people.
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A leg refers to one of the two wires in a 220V circuit
In electrical engineering, a leg refers to one of the two wires in a 220V circuit. Each leg carries 120V of electricity, and a third wire serves as the neutral wire. This type of system is known as a single-phase system, where the current flows between two "hot" wires, or legs, rather than in a circular pattern.
In a 220V circuit, the two legs are typically labelled as L1 and L2, with the current flowing from one to the other. This means that the direction of the flow at these two points is always the same. The neutral wire, on the other hand, is usually marked as "N" and acts as a centre tap, resulting in the voltage between it and each of the legs being 120V.
The term "leg" is commonly used when discussing residential power and circuit breaker boxes. For example, if one set of breakers has 120V but the other does not, it may indicate that one leg is missing or not functioning properly. This can lead to issues with appliances and devices that require a 220V supply, such as air conditioning units.
Switch leg wiring is another context in which the term "leg" is used. This type of wiring is employed in homes when there is no overhead light in a room, allowing for control of floor lamps or other plugged-in devices via a wall switch. In a switch leg configuration, power typically enters the receptacle first, with the neutral wire connecting directly to the outlet, while the hot wire splits.
It is important to note that older electrical panels may have different configurations, and it is always recommended to consult a licensed electrician when dealing with electrical issues or repairs.
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A dead leg means the loss of one leg of current
In electrical wiring, a "leg" refers to one of the two lines coming into a home's main electrical panel, which provides power to the breakers. These are also known as "phases". The current flows from one line to the other, always in the same direction at each point.
A "dead leg" refers to a loss of power in one of these legs, resulting in the loss of one leg of current. This can be caused by an issue with the electrical wiring, such as a loose or damaged wire, or a problem with the power supply coming into the home. It is important to note that this is not a simple DIY fix and professional help should be sought.
When a dead leg occurs, it can result in a loss of power to half of the electrical panel, affecting both 120V and 240V appliances. While some 240V appliances, such as clothes dryers, may still function by drawing power from the live leg, others may not work properly or may malfunction. It is recommended to turn off all large appliance breakers, such as AC/Heat pump, dryer, stove, and water heater, as they require 240V to operate and may be damaged if trying to operate on 120V.
To resolve a dead leg issue, it is crucial to first identify the cause. This may involve checking the wiring for any faults, inspecting wire connections, and consulting the home's electrical wiring diagram. If the issue is with the wiring, a licensed electrician should be called to make the necessary repairs. If the problem is with the power supply coming into the home, the power company should be contacted to investigate and resolve the issue.
In summary, a dead leg means the loss of one leg of current, which can have significant impacts on the functionality of electrical appliances in a home. It is important to address this issue promptly and with the help of professionals to ensure the safe and proper restoration of power.
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A red leg or high leg panel is a type of electrical panel
In electrical wiring, a "leg" refers to one of the wires connecting a power source to an electrical device. In a home's power supply, there are typically two legs, each carrying 120 volts of electricity, which together provide 240 volts for high-power appliances.
The high leg is created by connecting one transformer to one phase of the primary distribution circuit and a second, larger transformer to another phase. The secondary of the second transformer is then connected to one side of the lighting transformer secondary, while the other side is brought out as the high leg. This configuration results in a voltage of 208 volts on the high leg, compared to the standard 120 volts on the other two legs.
A red leg or high leg panel is typically used in industrial or older, rural installations. It offers several benefits, such as reduced costs and the ability to power both three-phase and single-phase appliances without requiring additional transformers. However, it is important to correctly identify the high leg to avoid issues, as connecting devices not rated for the higher voltage can lead to equipment failure.
Identifying the high leg in a panel can be challenging as there is no standard colour-coding system. While some panels may use colours to indicate the high leg, others may not provide any clear indication, requiring specialised knowledge or equipment to identify the correct wiring configuration.
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Switch leg wiring is used to control power to an outlet or fixture
In electrical installations, switch leg wiring is used to control power to an outlet or fixture. It is a common method employed when there is no overhead light in a room, allowing homeowners to control floor lamps or other plugged-in devices with a wall switch.
Switch leg wiring is a simple circuit that involves a single pole light switch. There are many variations of wiring a light switch, but the most common and basic variation involves bringing the power supply to the switch box and then using a "switch-leg drop" to the light. This method is especially useful if you want to use the switch to control more than one light.
In a switch leg configuration, power typically enters the receptacle first. The neutral wire connects directly to the outlet, while the hot wire splits. One part of the hot wire goes to one receptacle, providing constant power. The other part runs to the switch and back to the other receptacle, creating a switchable outlet.
Three-way switch leg wiring allows control from two different locations, which is useful in larger rooms or hallways with multiple entry points. This setup is more complex than standard switch leg wiring, but the principle remains the same: providing switchable power to an outlet or fixture.
It is important to prioritize safety when working with electrical components. If you are unsure about any step in the process, it is recommended to consult a licensed electrician.
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Frequently asked questions
LEG is an acronym for London Electricity Group.
A "leg" refers to one of the wires in a circuit. For example, a 220V circuit has two legs that supply 110V each and a third neutral wire.
A "switch leg" is a wiring configuration that controls power to an outlet or fixture using a wall switch. It is commonly used when there is no overhead light in a room, allowing control of floor lamps or other plugged-in devices.
