---
kind: "section"
citation: "46 C.F.R. § 112.05-3"
title: "46"
number: "112.05-3"
heading: "Main-emergency bus-tie."
url: "https://uscodex.org/cfr/46/112.05-3"
---

# §112.05-3. Main-emergency bus-tie.


Each bus-tie between a main switchboard and an emergency switchboard must:

- (a) Disconnect automatically upon loss of potential at the emergency switchboard;
- (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
- (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.

## Notes

### Authority

Authority: 46 U.S.C. 3306, 3703; DHS Delegation No. 00170.1, Revision No. 01.2.

### Source

Source: CGD 74-125A, 47 FR 15267, Apr. 8, 1982, unless otherwise noted.