---
kind: "section"
citation: "46 C.F.R. § 111.50-5"
title: "46"
number: "111.50-5"
heading: "Location of overcurrent protective devices."
url: "https://uscodex.org/cfr/46/111.50-5"
---

# §111.50-5. Location of overcurrent protective devices.

- (a) **Location in circuit.** Overcurrent devices must be at the point where the conductor to be protected receives its supply, except as follows:
  - (1) The generator overcurrent protective device must be on the ship's service generator switchboard. (See [§ 111.12-11(g)](/cfr/46/111.12-11.md?p=g) for additional requirements.)
  - (2) The overcurrent protection for the shore connection conductors must meet [§ 111.30-25(f)](/cfr/46/111.30-25.md?p=f).
  - (3) If the overcurrent device that protects the larger conductors also protects the smaller conductors, an overcurrent device is not required at the supply to the smaller conductors.
  - (4) If the overcurrent device protecting the primary side of a transformer also protects the conductors connected to the secondary side, as determined by multiplying the current-carrying capacity of the secondary conductor by the secondary to primary transformer voltage ratio, and this protection meets [§ 111.20-15](/cfr/46/111.20-15.md) of this chapter, an overcurrent device is not required at the supply to the secondary side conductors.
- (b) **Location on vessel.** Each overcurrent device:
  - (1) **Must be—**
    - (i) Readily accessible; and
    - (ii) In a distribution panelboard, switchboard, motor controller, or similar enclosure; and
  - (2) **Must not be—**
    - (i) Exposed to mechanical damage; and
    - (ii) Near an easily ignitable material or where explosive gas or vapor may accumulate.

## Notes

### Amendments

[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by USCG-2020-0075, 88 FR 16362, Mar. 16, 2023]

### Authority

Authority: 46 U.S.C. 3306, 3703; DHS Delegation No. 00170.1, Revision No. 01.2. Section 111.05-20 and Subpart 111.106 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905.

### Source

Source: CGD 74-125A, 47 FR 15236, Apr. 8, 1982, unless otherwise noted.

### Amendments

[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by USCG-2020-0075, 88 FR 16362, Mar. 16, 2023]