TN-C-S

An alternating current (AC) is an electrical current where the magnitude and direction of the current varies cyclically, as opposed to direct current, where the direction of the current stays constant. The usual waveform of an AC power circuit is a sine wave, as this results in the most efficient transmission of energy. However in certain applications different waveforms are used, such as triangular or square waves. Used generically, AC refers to the form in which electricity is delivered to businesses and residences. Ho ...

Including:

• Alternating current - History
• Alternating current - Distribution and domestic power supply
• Alternating current - AC power supply frequencies by country
• Alternating current - Mathematics of AC voltages

Read more here: » Alternating current: Encyclopedia - Alternating current

Concentric objects share the same center or origin. Circles, disks, and spheres may be concentric; such concentric objects need not have the same radius. Concentric cable is a cable type used in TN-C-S earthing systems where the combined neutral and earth core completely surrounds the live core(s). This minimises the risk of completely cutting through the combined neutral and earth without first completely cutting t ...

Read more here: » Concentric: Encyclopedia - Concentric

Electricity distribution - History. In the early days of electricity generation, direct current (DC) generators were connected to loads at the same voltage. The generation, transmission and loads had to be of the same voltage because at the time there was no known way of doing DC voltage conversion (other than inefficient motor-generator sets). The voltages had to be fairly low with such systems due to the fact that it is difficult and dangerous to distribute high voltages to small loads. The losses in a cable ar ...

See also:

Electricity distribution, Electricity distribution - Description, Electricity distribution - History, Electricity distribution - Introduction of alternating current, Electricity distribution - Distribution network configurations, Electricity distribution - U.S. and U.K. terminology, Electricity distribution - Reference

Read more here: » Electricity distribution: Encyclopedia II - Electricity distribution - Description

The names for the following methods of earthing are those defined by IEC standards, which are used in Europe and many other regions. For a more detailed explanation, see earthing systems. Different terminology is used in North America, but the basic principles should be the same everywhere. Since the neutral point of a supply system is often connected to earth ground, neutral and earth are closely related. Various measures are used to minimize the voltage difference between neutral and local earth ground. In some systems, the n ...

See also:

Ground and neutral, Ground and neutral - Earthing systems, Ground and neutral - How the earth protects, Ground and neutral - Equipotential bonding, Ground and neutral - Combining neutral with earth, Ground and neutral - Portable appliances

Read more here: » Ground and neutral: Encyclopedia II - Ground and neutral - Earthing systems

In the early days of electricity generation, direct current (DC) generators were connected to loads at the same voltage. The generation, transmission and loads had to be of the same voltage because at the time there was no known way of doing DC voltage conversion (other than inefficient motor-generator sets). The voltages had to be fairly low with such systems due to the fact that it is difficult and dangerous to distribute high voltages to small loads. The losses in a cable are proportional to the square of the current, the length of the ca ...

See also:

Electricity distribution, Electricity distribution - Description, Electricity distribution - U.S. and U.K. terminology, Electricity distribution - Reference

Read more here: » Electricity distribution: Encyclopedia II - Electricity distribution - Description

AC voltage can be stepped up or down by a transformer to a different voltage. High-voltage, direct current electric power transmission systems contrast with the more common alternating-current systems as a means for the bulk transmission of electrical power. However, these tend to be more expensive and less efficient than transformers, or did not exist when Edison, Westinghouse and Tesla were designing their power systems. Use of a higher voltage leads to more efficient transmission of power. The power losses in a conductor are a prod ...

See also:

Alternating current, Alternating current - History, Alternating current - Distribution and domestic power supply, Alternating current - AC power supply frequencies by country, Alternating current - Mathematics of AC voltages

Read more here: » Alternating current: Encyclopedia II - Alternating current - Distribution and domestic power supply

Electrical equipment is made by the manufacturer to be used on a specific frequency, in general 50 or 60 hertz or for both frequencies. If specified for one frequency this equipment cannot and should not be used on the other frequency, because of burn out and therefore fire reasons. The frequency of the electrical system varies by country; most electric power is generated at either 50 or 60 Hz. The 60 hertz countries are: American Samoa, Antigua and Barbuda, Aruba, Bahamas, Belize, Bermuda, Canada, Cayman Islands, Colombia, Costa Rica ...

See also:

Alternating current, Alternating current - History, Alternating current - Distribution and domestic power supply, Alternating current - AC power supply frequencies by country, Alternating current - Mathematics of AC voltages

Read more here: » Alternating current: Encyclopedia II - Alternating current - AC power supply frequencies by country

Equipotential bonding involves joining together metalwork that is or may be earthed so that it is at the same potential to prevent shock from between those pieces of metal as the earth system handles a fault. In the UK, equipotential bonding is done from the consumer unit (also known as fuse box, breaker box and distribution board) to incoming water and gas services. It is also done in bathrooms where all exposed metal that leaves the bathroom including metal pipes and the earths of electrical circuits must be bonded together to ensur ...

See also:

Ground and neutral, Ground and neutral - Earthing systems, Ground and neutral - How the earth protects, Ground and neutral - Equipotential bonding, Ground and neutral - Combining neutral with earth, Ground and neutral - Portable appliances

Read more here: » Ground and neutral: Encyclopedia II - Ground and neutral - Equipotential bonding

In a system with a grounded (earthed) neutral, bonding all non-current-carrying metallic parts of equipment to earth ground, will ensure that current due to faults of the insulation will be diverted to earth. Bonding will allow the branch circuit protection (a fuse (electrical) or circuit breaker) to detect the fault rapidly and interrupt the circuit. In the case of a TT system where the impedance is high due to the lack of direct connection to the transformer neutral an RCD (Residual-Current Device, sometimes known as a Residual Curr ...

See also:

Ground and neutral, Ground and neutral - Earthing systems, Ground and neutral - How the earth protects, Ground and neutral - Equipotential bonding, Ground and neutral - Combining neutral with earth, Ground and neutral - Portable appliances

Read more here: » Ground and neutral: Encyclopedia II - Ground and neutral - How the earth protects

William Stanley Jr designed one of the first practical coils to produce alternating currents. His design was an early precursor of the modern transformer, called an induction coil. From 1881 to 1889, the system used today was devised by Nikola Tesla, George Westinghouse, Lucien Gaulard, John Gibbs, and Oliver Shallenger. These systems overcame the limitations imposed by using direct current, as found in the system that Thomas Edison fir ...

See also:

Alternating current, Alternating current - History, Alternating current - Distribution and domestic power supply, Alternating current - AC power supply frequencies by country, Alternating current - Mathematics of AC voltages

Read more here: » Alternating current: Encyclopedia II - Alternating current - History