Classical Physics

    

Some Simple Formulae for Grounding in a Laboratory and the Respective Definition of "Strong Current": a Gate Into Electrical Safety

Authors: E.Gluskin, R.Rabinovici

The concepts of "high power" and/or "heavy current" are defined from the positions of electrical safety in a power laboratory. According to this criterion, for the nominal full power of the device under test (generator, motor, or transformer), we obtain that , where Rgr is the resistance of the grounding, is the maximal voltage permitted for touching, and is the range of the output voltage of the power device, associated with its non-ideality as a voltage source. Limiting one of the values Rgr, or Snom, for the other given, this formula defines what is "high power" for a given laboratory, and the concept of "heavy current" thus appears as a relative one, adjusted to the safety needs. This approach can be helpful in making the very important topic of electrical safety interesting for students and teachers.

Comments: 15 Pages. It is some basic electrical safety from the positions of elementary circuit theory; the argument should be useful for physics and EE students, engineers and teachers.

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Submission history

[v1] 2015-06-09 07:08:06
[v2] 2015-06-09 13:33:11

Unique-IP document downloads: 436 times

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