Motor Control Centers Sample Clauses

Motor Control Centers. This section covers the engineering, design, manufacture, installation and testing of indoor motor control centers. The motor control centers shall supply the 480 volt station auxiliary loads. The equipment shall be suitable for operation on a 480/277 volt, three-phase, 60 hertz, grounded service. Motor control centers shall conform to the requirements of UL 845, NEMA ICS1, NEMA ICS2, NEMA ICS4, and NEMA ICS6. Each Motor Control Center shall consist of one or more vertical sections and shall be designed to permit future additions, changes, or regrouping. As a minimum, one equipped spare space for a size 2 starter shall be provided for each vertical section. In addition, one spare combination starter of each size and -------------------------------------------------------------------------------- EPC - Exhibit B -------------------- TENASKA GEORGIA GENERATION PROJECT Page 93 of 132 -------------------------------------------------------------------------------- type less than size 5 shall be supplied in each Motor Control Center. The Motor Control Center assembly shall be of a nonventilating type. All enclosure vertical sections shall be mounted on continuous front and back channel iron xxxxx and bolted firmly together to form a rigid, freestanding, dead-front, completely enclosed, front line assembly. Vertical sections shall be formed of manufacturer's standard gauge sheet steel with uniform, blemish-free surfaces. Each vertical section may contain a maximum of six unit compartments. End sections shall have removable end closing plates, and provisions shall be provided for access to horizontal bus and horizontal wireways. Easily removable blank hinged doors shall cover all unused unit spaces. Bolted covers shall be furnished on the rear of the section. The vertical bus and its insulation in the rear section shall be covered with sheet metal plates suitable for mounting control and other devices. Conduit entrance space and wire entry room greater or equal to cross-sectional area of vertical wireways shall be provided at both the top and bottom of each section. Top and bottom horizontal wireways with full length continuity shall be provided. Wireways shall be isolated from the bus bars by barriers. A vertical wireway shall extend from the top horizontal wireway to the bottom horizontal wireway for the purpose of routing cables to control units. The wireway shall be isolated from all units and the bus bars to guard against accidental contact. A separate hinge...
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Motor Control Centers. The motor control center contains circuit protective devices and power distribution equipment to supply electrical power to all packaged power plant devices as defined on the electrical one line diagram. The motor control center is manufactured and tested in accordance with NEMA ICS-2 and UL Standard No. 845. Vertical sections and individual units will be UL (CSA) Labeled where possible. The motor control center is located in the PEECC.
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Motor Control Centers o Distributed Control System. o CEMS/
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Motor Control Centers. Motor control centers (MCCs) shall be used to consolidate certain motor controllers as depicted in References Error! Reference source not found. and (3C). MCCs shall provide electrical services to motor-driven rotating machinery operating on 3-phase, 3-wire ungrounded circuits supplied with a nominal voltage of 480 VAC. Each MCC branch circuit motor and motor control system shall provide stand-alone functionality. MCCs shall provide a means of disconnecting and locking out individual motor circuits at the motor control center. The disconnect device is to indicate whether the device is open or closed. Construct each MCC to meet the degree of protection suitable for the intended location. Design and construct the equipment to provide a dead front degree of construction. Unless otherwise approved by the Owner's Representative, front access for all serviceable components is required. Service access from the rear shall be limited to maintenance of bus connections, circuit breaker stab connections to field loads and making up ship's cable and shipping splits on installation as applicable. MCCs shall be Square D or equal. Enough sections shall be provided at each MCC to house each motor controller shown in Reference (3C) with a 20% margin for future controller addition or two (2) additional sections, whichever is greater.
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