Otis Singleton
Electrical materials are essential components of electrical systems that enable power distribution and protection in homes and buildings. They are used in electrical installations and maintenance, including cutting, bending, and installing PVC conduits. Electrical materials can be broadly classified into conductors, semiconductors, insulators, and magnetic materials. Conductors, such as copper, silver, and gold, have high conductivity due to their large number of free electrons at room temperature. Semiconductors exhibit conductivity between conductors and insulators, while insulators have very low conductivity and high resistivity, making them ideal for insulating current-carrying parts. Magnetic materials, including ferromagnetic substances and ferrites, are crucial for electrical machines due to their magnetic properties.
Additionally, electrical supplies encompass a range of tools and devices used in electrical work, such as voltmeters, ammeters, and multimeters for measuring, and pliers, wire strippers, and utility knives for cutting and shaping. Other electrical materials include switches, fuses, circuit breakers, electrical wires, and connectors, each serving a specific purpose in controlling, carrying, and protecting electrical currents.
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What You'll Learn
Conductors, semiconductors, and insulators
Electrical materials are essential parts used in construction projects to connect buildings to an electrical power source. They can range from small house circuits to large industrial plants.
Semiconductors, on the other hand, have electrical conductivity values between those of conductors and insulators. At normal temperatures, semiconductors have low conductivity, but it increases rapidly with increasing temperature. This is because, at low temperatures, the valence band of a semiconductor is full, and the conduction band is empty. As the temperature rises, some electrons can cross the forbidden energy gap, and more valence electrons cross over as the temperature increases, leading to increased conductivity. Examples of semiconductors include germanium, silicon, and gallium arsenic.
Insulators, in contrast, have very low conductivity and high electrical resistance, making them useful for protection against electric shocks. They possess high resistivity due to the tight binding of their electrons to the nucleus, preventing free movement. Examples of insulating materials include plastics, ceramics, and PVC.
Other common electrical materials include switches, fuses, male plugs, convenience outlets, wires, and circuit breakers. Wires can be stranded, consisting of multiple strands joined to form a single wire, or solid, with a single strand of aluminum or copper. Fuses prevent short-circuiting by cutting the current when there is an overload, while circuit breakers interrupt the flow of electric current to protect against shorts or overloads.
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Electrical wiring
One of the most common types of electrical wiring is the non-metallic (NM) cable, also known as Romex. NM cable is designed for interior use in dry locations and is the standard wiring in modern homes. It consists of two or more individual wires wrapped inside a protective plastic sheathing, including "hot" (current-carrying), neutral, and ground wires. The wires are colour-coded, with black for "hot" and white for neutral, making it easy to identify and install.
Another type of wiring is the Underground Feeder (UF) cable, designed for wet locations and direct burial in the ground. UF cable supplies power to outdoor fixtures and includes insulated "hot" and neutral wires, along with a bare copper ground wire. The sheathing on UF cable is a solid plastic that surrounds each wire, providing durable insulation and protection from the elements.
For locations requiring a metal sheath, such as conduit wiring, THHN and THWN wires are used. These are single conductors with colour-coded insulation, ensuring that the wiring can be identified and installed correctly.
It is important to select the appropriate wire gauge for the current it will carry. The American Wire Gauge (AWG) system indicates the wire's current-carrying capacity or amperage rating. Using the wrong gauge can lead to an increased risk of short circuits and fires.
Additionally, electrical wiring should be properly sized and installed to meet safety standards and pass electrical inspections. Working with a licensed electrician is recommended for ensuring the correct wiring techniques and adhering to local building codes.
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Fuses, switches, and circuit breakers
Fuses are small, thin conductors designed to melt and break the circuit in the event of excessive current. They are made of metal or alloy, which offers predictable and stable characteristics. Modern fuses do not blow automatically but instead cut the current down when the flow of electricity is too high or too low. Fuses are rated according to the amount of current they can handle, with higher ratings providing more protection.
Switches are another common electrical device that helps to connect and disconnect the flow of electricity in a circuit. When the flow of electricity is connected, lights or other appliances turn on.
Circuit breakers are devices that automatically interrupt the flow of an electric current to protect against short circuits and overloads. They are specially designed switches that open to stop the current when there is an overcurrent. They come in various sizes, with smaller breakers protecting individual household appliances and larger ones protecting high-voltage circuits supplying electricity to entire cities. Circuit breakers do not destroy themselves when breaking the circuit, unlike fuses.
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Magnetic materials
The magnetic properties of engineering materials determine their suitability for specific magnetic applications. Permeability, for instance, is the ability of a material to support magnetic flux, which is crucial for electrical machine cores. Materials with high permeability, such as iron, cobalt, and nickel, are used to build the core and create a low reluctance path for magnetic flux. Retentivity, on the other hand, is the ability of a material to retain magnetization after the external magnetic field is removed. Materials with high retentivity can retain their magnetization even after the removal of the external magnetic field, a property known as magnetic hysteresis.
- Diamagnetic materials: Atoms in these materials have all their electron spins paired, resulting in no net magnetic moment. When placed in a magnetic field, they develop induced magnetic moments that align opposite to the external field, causing repulsion. Common examples include bismuth, copper, lead, silicon, and diamond.
- Paramagnetic materials: These materials exhibit weak magnetization in the direction of the external magnetic field when placed in one. They have some unpaired electrons, resulting in a net magnetic moment at the atomic level. Examples include aluminium, platinum, oxygen, and air.
- Ferromagnetic materials: These materials have complex crystal structures and exhibit strong magnetic behaviour. They find widespread use in applications such as electromagnets, electric motors, transformers, and magnetic recording devices.
- Antiferromagnetic materials: In these materials, the magnetic moments of atoms or ions align in opposite directions, resulting in a net magnetic moment of zero.
- Ferrimagnetic materials: These materials have lower magnetic saturation compared to ferromagnetic materials.
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Electrical engineering materials
Electrical wires are also essential electrical engineering materials. They can be run overhead, underground, through conduit, or flexibly. Wires can vary in size and are protected by a jacket depending on their usage. There are two main types of wires: stranded wires, which are made up of multiple strands of wire, and solid wires, which consist of a single strand of aluminium or copper.
Other electrical engineering materials include switches, fuses, circuit breakers, and electrical conduits.
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