The Latest: Con Ed: Relay system failure led to blackout

NEW YORK (AP) — The Latest on the investigation into the cause of a Manhattan power outage (all times local):
5:30 p.m.
A relay protection system that should have isolated a faulty distribution cable but didn’t led to the loss of power that darkened Manhattan for several hours.
Con Edison says a preliminary review of Saturday’s blackout shows that the relay system at a West 65th Street substation should have kept the problem from spreading.
Instead, the electrical fault was iso