Section 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 1 of IEC 60092-201:2019 (all incorporated by reference; see § 110.10-1 of this subchapter), as appropriate, for the location where it is installed. In addition, each such enclosure in a hazardous location must meet the requirements of subpart 111.105 of this part. NEMA ICS 2.4 (incorporated by reference; see § 110.10-1 of this subchapter) 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:(1) A motor controller that has low-voltage release under paragraph (b) of this section.(2) A motor controller for a motor of less than 2 horsepower (1.5 kW).(d)Identification of controllers.(1) Each motor controller and motor control center must be marked externally with the following information:(i) Manufacturer's name or identification.(vi) Identification of motor being controlled.(vii) Current rating of trip setting.(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; USCG-2013-0671, 78 FR 60153, Sept. 30, 2013