StacksVerified U.S. regulatory reference

46 CFR §112.05-3

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each bus-tie between a main switchboard and an emergency switchboard must:
  1. (a)Disconnect automatically upon loss of potential at the emergency switchboard;
  2. (b)Be arranged to prevent parallel operation of an emergency power source with any other source of electric power, except for interlock systems for momentary transfer of loads; and
  3. (c)If arranged for feedback operation, open automatically upon overload of the emergency power source before the emergency power source is tripped off the line from the overload.