Molly Ayala
In electrical terms, L stands for Live and N stands for Neutral. These symbols are used to differentiate between two types of wires in an AC power supply. The Live wire, also known as the Line wire, carries the AC voltage relative to the ground, while the Neutral wire is connected to the ground and always has 0V compared to it. While L and N have specific meanings in electrical terms, it is important to note that the correct terminology is critical for safety reasons, as confusing line with live can be dangerous.
L and N in Electrical Terms in Australia
| Characteristics | Values |
|---|---|
| L | Live or Line |
| N | Neutral |
| L Wiring | Connected to the unearthed conductive part of the AC main supply |
| N Wiring | Connected to the earthed conductive part of the AC main supply |
| N Voltage | 0V compared to ground |
| L Voltage | 120V relative to the ground |
| N Connection | Typically clamped to earth where the cable enters the house or at the local substation |
| L and N Connection | No connection should be made at additional sub-panels |
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What You'll Learn
L stands for 'Live'
In electrical terms, L stands for Live, which means the circuit is switched on and connected. The opposite of Live is Dead, or disconnected.
In an AC power supply, L is also referred to as Line, which means one of the conductors of an alternating supply. There may be multiple lines in a multiphase supply, such as L1, L2, and L3 in a 3-phase supply.
The term Live or Line indicates that the wire carries AC voltage relative to the ground or neutral, which is typically connected to earth. In an AC power supply, Live (or Line) carries 120V relative to the Neutral wire.
It is important to distinguish between Live and Neutral wires, as they serve different functions in an electrical circuit. While the Live wire carries the voltage and current, the Neutral wire is connected to the ground and always has 0V relative to the ground.
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N stands for 'Neutral'
N stands for Neutral. In electrical engineering, the neutral wire is denoted by the letter N. It is one of the two wires needed to supply electrical circuits with alternating current, the other being the live wire, denoted by L. The neutral wire completes the circuit back to the source and is usually connected at a neutral bus within panelboards or switchboards. It is also "bonded" to earth ground at either the electrical service entrance or at transformers within the system.
The neutral wire is used to connect to a system neutral and can also be used for grounding (earthing) of equipment and structures. However, care must be taken to ensure that the neutral wire never rises to a high voltage with respect to the local ground. Ground or earth in a mains (AC power) electrical wiring system is a conductor that provides a low-impedance path to the earth to prevent hazardous voltages from appearing on equipment.
In a 2-core cable, the neutral wire is blue, while the live wire is brown. In older installations, the colours may vary, and the wires may be black. It is important to note that while the neutral wire should not carry voltage, this is not always the case in practice, and it should be checked with an electric screwdriver to ensure safety.
The neutral wire is an essential component of electrical installations, and any changes to electrical installations should be done under the supervision of a qualified person to ensure safety.
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L and N are AC power supply symbols
In electrical terms, L and N are symbols used to represent the Live and Neutral poles of an Alternating Current (AC) power supply. In an AC power supply, there are two wires: the Live wire (L) and the Neutral wire (N). The Live wire is connected to the unearthed conductive part of the AC main supply, while the Neutral wire is connected to the earthed conductive part. This distinction is important for safety, as it ensures protection from electric shock and earth fault.
The Live wire carries the AC voltage relative to the ground, which is typically around 120 volts. This wire is also known as the "hot line" because it is always energised or "live". On the other hand, the Neutral wire is connected to the ground and always has 0 volts compared to the ground. It is sometimes referred to as the "cold wire".
It is important to note that the terms "Live" and "Line" should not be confused. "Live" refers to a switched-on or connected state, while "Line" refers to one of the conductors of an alternating supply. In a three-phase supply, there may be multiple lines, such as L1, L2, and L3.
In Australia, the N/L notation is commonly used to refer to the different circuits within a house. For example, the lounge and kitchen may be on one circuit, while the bedrooms and bathrooms are on another. This notation is often seen on electrical plans or meter boxes.
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L and N refer to different circuits in a house
In electrical terms, L and N are used to refer to different circuits in a house. They are part of an AC (alternating current) power supply and stand for Live and Neutral, respectively. The Live wire carries the AC power, which is usually 120 volts, while the Neutral wire is connected to the ground and always has 0 volts. These two wires are connected to the AC input terminal, with the Live wire connected to the unearthed conductive part and the Neutral wire connected to the earthed conductive part. This setup is important for safety, as it protects against electric shock and earth fault.
In a typical house circuit, the Neutral wire is clamped to the earth where the cable enters the house or at the local substation. While the Neutral wire is ideally supposed to have 0 volts, there can be a small voltage difference between it and the earth at the wall sockets due to current draw at various outlet points. This is known as a volt drop.
The Live wire, on the other hand, carries the AC power, which is typically 120 volts in a standard household circuit. This wire is connected to the unearthed conductive part of the AC main supply. It is important to note that the Live wire is not the same as the ground wire, which is usually green and only carries current in the event of a fault.
In a three-phase supply, there can be multiple Live wires, known as L1, L2, and L3. These wires are used to provide power to different circuits or rooms within a house. For example, one Live wire might power the lounge and kitchen, while another powers the bedrooms and bathroom. This allows for more efficient use of electricity and helps to manage the power load.
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L and N are connected to the AC main supply
On the other hand, the N wire, or "Neutral" wire, completes the electrical circuit back to the power source. It is connected to the building's grounding system and provides a return path for the electrical current. The N wire is essential for safety, as it helps prevent electrical shocks and fires by providing a low-resistance path for any stray currents or voltage spikes.
Together, the L and N wires provide the necessary infrastructure for electrical appliances and devices to function properly. They carry the electrical current to and from the devices, providing the power needed for their operation. The voltage difference between the L and N wires drives the current flow, and this voltage is typically around 230 volts in Australia.
When connecting an appliance to the AC main supply, it is important to ensure that the L and N wires are connected correctly. The L wire should be connected to the terminal marked with an "L" or a red or brown colour coding, while the N wire should be connected to the terminal marked with an "N" or a black or blue colour coding. Properly connecting these wires ensures the safe and efficient operation of electrical devices.
It is worth noting that a third wire, known as the "earth" or "ground" wire, may also be present in some cases. This wire is typically connected to the appliance's metal casing or a separate grounding terminal and serves as an additional safety measure to protect against electrical faults. However, the presence of this wire does not negate the importance of properly connecting the L and N wires to the AC main supply.
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Frequently asked questions
L stands for Live and N stands for Neutral.
Live means switched on, while Neutral is connected to the ground and always 0V compared to the ground.
The terminal L must be connected to the unearthed conductive part of the AC main supply, while the terminal N must be connected to the earthed conductive part of the AC main supply.
