Experience with a grounded neutral on the high-tension system of the Interborough Rapid Transit Company

The chief circumstance which led to the grounding of the neutral of the Interborough Rapid Transit Company´s high-tension system was the serious nature of cable burn-outs. As a rule the detectors gave indication of a ground on one leg of the system from five to thirty minutes before the circuit-breaker opened, but on account of the large number of feeders connected it was practically impossible to isolate the damaged feeder before the short-circuit occurred. In a total of twelve operating burn-outs, the grounded cable was located butt wice in time to prevent trouble.