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The conductor that connects the exposed metallic parts of the consumer's electrical installation is called protective earth (PE; see also: Ground). The conductor that connects to the star point in a three-phase system, or that carries the return current in a single-phase system, is called neutral (N). Three variants of TN systems are distinguished:
PE Civil Transportation: 1421: 68%: 815: 33% PE Civil Water Resources and Environmental: 1430: 71%: 613: 35% PE Control Systems: 229: 79%: 49: 45% PE Electrical and Computer: Computer Engineering 21 62% 7 29% PE Electrical and Computer: Electrical and Electronics 104 78% 43 60% PE Electrical and Computer: Power 1003 66% 509 38% PE Environmental ...
IEC 61508 is an international standard published by the International Electrotechnical Commission (IEC) consisting of methods on how to apply, design, deploy and maintain automatic protection systems called safety-related systems.
For electrical motors, a similar kind of information is conveyed by the service factor, which is a multiplier that, when applied to the rated output power, gives the power level a motor can sustain for shorter periods of time. The service factor is typically in the 1.15-1.4 range, with the figure being lower for higher-power motors.
An electrical ground system should have an appropriate current-carrying capability to serve as an adequate zero-voltage reference level. In electronic circuit theory, a "ground" is usually idealized as an infinite source or sink for charge, which can absorb an unlimited amount of current without changing its potential.
The reference handbook was distributed as a hard copy; examinees were not allowed to bring their own copies and had to return the provided ones at the end of each session. In 2015, content changes in the exam were instituted to make it discipline-specific, with a plan of weaving general engineering subject matter (e.g. math and science ...