Voltage-operated earth-leakage protection

The paper “Voltage-operated earth-leakage protection” by T. C. Gilbert, deals with the problem of protection of low-voltage distribution systems from the standpoint of practical experience rather than from a purely theoretical basis, particularly for secondary systems on customers´ premises. The author discusses the protection of secondary systems quite thoroughly and sets up the relative importance of the various factors in the problem, such as fire risk, shock hazard, cost of the installation, etc., but with greatest emphasis on the fire risk, since in rural areas this presents the greatest menace.