Fault Current

Fault current - Wikipedia, the free encyclopedia
Fault current comes in three varieties: Phase to neutral, phase to phase ... The prospective fault current of larger batteries, such as deep-cycle batteries ...
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Chapter 4: Fault-Current Limiters
Fault-current limiters using high temperature superconductors offer a solution ... These fault-current limiters, unlike reactors or high-impedance transformers, ...
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Fault current limiter - Wikipedia, the free encyclopedia
Superconducting Fault Current Limiters. UK Government 2007 Report on FCLs. High-temperature superconductor fault current limiters: concepts, applications, ...
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Fault Current, n.
Fault Current, n. Imagine a wrench inadvertently left in a starter following service. ... Fault current is generally very large and, therefore, hazardous. ...
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A fault current is an abnormal flow of current in an electric circuit due to a fault (usually a short circuit or abnormally low Electrical impedance path).

In terms of installation wiring, the prospective short-circuit current must be known as it influences the choice of protective device. If a circuit is to be properly protected, the fault current must be high enough to operate the protective device within as short a time as possible; also the protective device must be able to withstand the fault current and extinguish any resulting arcs without itself being destroyed or sustaining the arc for any significant length of time.

Fault current comes in three varieties: Phase to neutral, phase to phase and phase to earth. These differ widely depending on the type of earthing system used, the installation's supply type and earthing system, and its proximity to its substation. Typically, for a domestic UK 230 V, 60 A TN-S supply, fault currents may be in the thousands of amps. Prior to selecting protective devices, prospective fault current must be measured reliably at the origin of the installation and at the furthest point of each circuit, and this information applied properly to the application of the circuits.

For the exact requirements concerning UK wiring systems consult the most recent edition of BS7671 and the Building regulations in the United Kingdom.

See also

Ground (electricity)
Residual-current device
Electrical wiring