---
kind: "section"
citation: "46 C.F.R. § 129.320"
title: "46"
number: "129.320"
heading: "Generators and motors."
url: "https://uscodex.org/cfr/46/129.320"
---

# §129.320. Generators and motors.

- (a) Each generator and motor, except a submersible-pump motor, must be—
  - (1) In an accessible space, adequately ventilated and as dry as practicable; and
  - (2) **Mounted above the bilges to avoid damage by splash and to avoid contact with low-lying vapors.**
- (b) Each generator and motor must be designed for an ambient temperature of 50 °C (122 °F), except that—
  - (1) If the ambient temperature, in the space where a generator or motor is, does not exceed 40 °C (104 °F) under normal operating conditions, the generator or motor may be designed for an ambient temperature of 40 °C (104 °F); and
  - (2) A generator or motor designed for an ambient temperature of 40 °C (104 °F) may be used in a location where the ambient temperature is 50 °C (122 °F), if the generator or motor is derated to 80 percent of the full-load rating and if the rating or setting of the overcurrent devices of the generator or motor is reduced accordingly.
- (c) For each generator rated at 50 volts or more, a voltmeter and an ammeter used for measuring voltage and current while the generator is in operation must be provided. For each alternating-current generator, a means for measuring frequency must also be provided. To ensure satisfactory operation of each generator, additional control equipment and measuring instruments, if needed, must also be provided.
- (d) Each generator must have a nameplate attached to it indicating—
  - (1) Name of manufacturer, type of generator, and designation of frame;
  - (2) Output in kilowatts, or horsepower rating;
  - (3) Kind of rating (continuous, overload, or other);
  - (4) Amperes at rated load, voltage, and frequency;
  - (5) Number of phases, if applicable;
  - (6) Type of windings, if DC;
  - (7) When intended for connection in a normally grounded configuration, the grounding polarity; and
  - (8) **For a generator derated to comply with paragraph (b)(2) of this section, the derated capacity.**
- (e) Each motor must have attached to it a nameplate containing the information required by Article 430 of NFPA 70.

## Notes

### Authority

Authority: 46 U.S.C. 3306; sec. 617, Pub. L. 111-281, 124 Stat. 2905; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 82-004 and CGD 86-074, 62 FR 49332, Sept. 19, 1997, unless otherwise noted.