Otis Singleton
In electrical systems, the term common wire is often used interchangeably with neutral wire. The common wire is an essential component in electrical systems, serving as the return path for electrical current in a circuit. It ensures the proper operation of circuits and appliances by balancing the electrical flow, preventing surges, and protecting your home from potential electrical hazards. The common wire is typically white or grey and is present in many parts of a home's electrical system, including light switches, outlets, thermostats, and electrical panels.
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What You'll Learn
'Common' is a generic term for high current return
The term "common" is used in electrical engineering to refer to a high current return. It is a generic term, and its specific meaning can vary depending on the context and the device being discussed.
In electronics, "common" is often used as a generic symbol to represent sensitive signals or power leakage. The correct symbol for high current return, or "common", is a simple thick wire or the metal chassis that the circuit is mounted on. This point is used for measurements as common. It is also known as "chassis earth".
The term "common" can have different meanings when applied to different electrical devices. For example, in a relay, the common terminal is the point where the two windings come together. In a capacitor, the common terminal is the input that connects to the fan and the compressor. In a transformer, the common terminal can refer to the high or low voltage side, depending on the context.
In control wiring, a "common wire" typically refers to a wire that is common to several different voltages, waveforms, or types of supplies. It is usually connected to the chassis or earth. However, in some cases, a "common wire" may not be earthed and is instead used as a reference voltage for multiple signals.
In summary, "common" is a broad term in electrical engineering that refers to a high current return, but its specific meaning can vary depending on the context and the device in question. It is often used as a generic term or symbol to represent a reference point for measurements or connections.
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It is also known as ''chassis earth'
In electrical engineering, the term "common" is often used interchangeably with "ground". "Ground" refers to a relatively low-impedance common potential that can absorb stray electric fields or serve as a reference point. "Common", on the other hand, implies an arbitrary voltage reference with no connotation about its voltage relative to the earth.
In electronics, "common" is often used as a generic symbol for high-current return, which is also known as "chassis earth". Chassis earth, or chassis ground, refers to the connection that establishes an electrical link between different metallic parts of a machine, such as electronic instruments and motor vehicles. It is important to note that the chassis must not be considered a link to Earth, as it is often, but not always, linked to the Earth.
For example, in cars, all metallic parts are linked together but are not linked to the Earth. This is why one might experience an electrical discharge when leaving a car. Chassis ground is particularly important when constructing a sound system, as achieving a clean reference ground is considered the ultimate goal for a high-end audio system.
To summarise, "common" in electrical terms refers to an arbitrary voltage reference, while "chassis earth" specifically refers to the electrical connection between metallic parts of a machine, which is often linked to but is not the same as Earth ground.
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'Common' is a relative term, with no connotation about its voltage relative to earth
The term "common" in electrical engineering is a relative term that can have different meanings depending on the context and the specific device or system being discussed. It is often used to describe a wire or terminal that is relatable or shares a common characteristic with the surrounding wires or terminals. For example, a "common wire" can refer to a wire that is common to several different voltages, waveforms, or types of supplies. It may also refer to a wire that is connected to a chassis or earth, although this usage of the term can vary.
In the context of circuit diagrams, "common" can refer to a point or node in the circuit that serves as a reference voltage or a return path for the current. This is often called the “signal ground” or "chassis earth", and it may or may not be connected to the physical earth. The term "common" in this context implies an arbitrary voltage reference, and its voltage relative to earth is not necessarily implied.
In some cases, "common" may refer to a specific terminal or connection on a device, such as a relay or a motor. For example, a relay may have a "common" terminal that is connected to both the "Normally Open" (NO) and "Normally Closed" (NC) terminals. The definition of "common" in this context depends on the specific device and its functionality.
It is important to note that the usage of the term "common" can vary between different companies, designers, and individuals. Therefore, it is essential to understand the specific context and device being discussed when interpreting the meaning of "common" in electrical engineering.
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It is a reference point for other voltages, waveforms, or types of supply
In electrical engineering, the term "common" is used to refer to a reference point for other voltages, waveforms, or types of supply. This reference point is used to compare and measure the electrical properties of a system. The term "common" in this context is flexible and can have different meanings depending on the specific device or system being discussed.
For example, in a basic Carrier 25HCB condenser unit, the "common" refers to the point where the two windings within the motors come together. In a relay, the "common" contact terminal is the one that is relatable or in common with the other terminals. In a capacitor, the "common" is the terminal that is shared by the two outputs. In a transformer, the "common" terminal can refer to the high-voltage or low-voltage side, depending on the context.
When discussing control wiring, the "common" wire is not always the neutral wire. It can also refer to a hot wire or a wire that is common to several different voltages, waveforms, or types of supply. In some cases, a "common" wire may be connected to the chassis or machine base, providing a reference point for measurements.
It's important to note that the term "common" should be defined within the specific context of the device or system being discussed. The meaning of "common" can vary, and it is essential to refer to the appropriate documentation or schematic notes to fully understand how it is being used in a particular scenario.
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'Common' is not always the same as 'neutral'
In the field of electronics, the term "common" is used to refer to an arbitrary voltage reference with no connotation about its voltage relative to the earth. It is a generic term that can mean different things in different contexts. The term "neutral," on the other hand, has a more specific meaning.
In a power wiring scheme, neutral refers to the center point or midpoint of the system, which is intended to carry current under normal conditions. It is usually the grounded lead, especially in the National Electrical Code (NEC). However, in low-voltage controls, there may be no distinct neutral since there is only one supply, and the term "neutral" may not be applicable.
In some cases, the common wire or terminal is the one that is relatable or has something in common with the surrounding wires or terminals. For example, relays, motors, control boards, and transformers may all have a common wire or terminal, but the specific meaning of "common" can vary between devices.
While "ground" and "common" are sometimes used interchangeably, they are not always the same. "Ground" typically refers to a low impedance common potential that can absorb stray electric fields or serve as a reference point, such as the center tap or neutral of a transformer. However, "common" can refer to a voltage reference that is not necessarily connected to the earth or ground.
For instance, in a dual power supply system, there may be a signal common and an analog common that are separate but connected together to a single point ground. Additionally, in certain logic circuits, a voltage like +5 or +12 may be referred to as "common" even though it is not earthed, as multiple signals are referenced to it.
Therefore, while "common" and "neutral" may overlap in certain contexts, they are not always interchangeable, and their specific meanings depend on the electrical device, system, and context in which they are used.
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Frequently asked questions
The word "common" in electrical engineering is used to refer to a "common wire or terminal". This is a wire or terminal that is relatable or in common with the surrounding wires or terminals. The definition of "common" can change depending on the device or item in question.
The "common" wire or terminal is called so because it is the one thing that is relatable or in common with the surrounding wires or terminals. It is a generic term that can be used to refer to a wire that is common to several different voltages, waveforms, or types of supplies.
No, "common" and "ground" are not the same. "Ground" refers to the earth or dirt on which we stand. "Common" implies an arbitrary voltage reference with no connotation about its voltage relative to earth. However, the two terms are sometimes used interchangeably, which can cause confusion.
A "common" wire or terminal can be found in relays, motors, control boards, and transformers. For example, in a relay, the common terminal is labelled as "C", and it is the point of contact for the other terminals, "NO" (Normally Open) and "NC" (Normally Closed).
