111.70-3—Motor controllers and motor-control centers.
(a) General.
The enclosure for each motor controller or motor-control center must meet either NEMA ICS 2 and NEMA ICS 2.3, or Table 5 of IEC 92-201 (all three standards incorporated by reference; see 46 CFR 110.10-1 ), as appropriate, for the location where it is installed. In addition, each such enclosure in a hazardous location must meet subpart of this part. NEMA ICS 2.4 (incorporated by reference; see 46 CFR 110.10-1) provides guidance on the differences between devices meeting NEMA and those meeting IEC for motor service.
(b) Low-voltage release.
Each motor controller for a fire pump, elevator, steering gear, or auxiliary that is vital to the vessel's propulsion system, except a motor controller for a vital propulsion auxiliary which can be restarted from a central control station, must have low-voltage release if automatic restart after a voltage failure or its resumption to operation is not hazardous. If automatic restart is hazardous, the motor controller must have low-voltage protection. Motor controllers for other motors must not have low-voltage release unless the starting current and the short-time sustained current of the additional low-voltage release load is within the capacity of one ship's service generator. Automatic sequential starting of low-voltage release controllers is acceptable to meet this paragraph.
(c) Low-voltage protection.
Each motor controller must have low-voltage protection, except for the following motor controllers:
(d) Identification of controllers.
(1)
Each motor controller and motor control center must be marked externally with the following information:
(2)
Each controller must be provided with heat durable and permanent elementary wiring/schematic diagrams of the controller located on the door interior.
[CGD 94-108, 61 FR 28281, June 4, 1996; 61 FR 33045, June 26, 1996, as amended by USCG-2003-16630, 73 FR 65199, Oct. 31, 2008]