Utility: Flawed sensor wiring played key role in blackout

NEW YORK (AP) — Electrical utility Con Edison says it’s figured out more details about why a relatively small problem escalated into a big blackout in Manhattan earlier this month.
The utility had already explained that the July 13 outage happened after a protective system called a relay failed to isolate a faulty high-voltage cable. A relay essentially can trigger a circuit breaker to keep a problem contained.
On Monday, Con Ed explained why the relay system didn’t work as exp