IFB08072026 - Garvan Woodland Gardens Parking Services (RE-BID)

The provided text is a section of a Request for Proposal (RFP) document for the NCHP Modernization Chiller Replacement project at the University of Arkansas. The section focuses on the specifications for motors, which are part of the mechanical system for the project. Here's a summary of the key points: **General Requirements** * The work must comply with the contract documents, general conditions, and supplemental general conditions. * Submittals, including shop drawings, must be provided in accordance with Division 01. **Product Criteria** * Motors must meet the latest edition of NEMA, IEEE, ANSI, and NEC standards and be listed by UL where applicable. * Motors must have totally enclosed fan-cooled (TEFC) enclosures and be compatible with specified starters. * Motors must be selected to meet the specified duty without exceeding the nameplate rating or operating into the service factor. **Motors** * Motors 1/2 HP and below must be NEMA rated 115V, single-phase, 60-cycle, while motors 3/4 HP and larger must be NEMA rated 460V, 3-phase, 60-cycle. * Motors must be 4-pole (approximately 1750 rpm) unless otherwise noted. * Single-phase motors must have built-in thermal overload protection. * Motors must have ball bearings with an ANSI/AFBMA L-10 rating of 200,000 hours. **Motors Driven by Variable Frequency Drives (VFDs)** * Motors driven by VFDs must comply with NEMA MG-1, Section IV, Part 31. * Motors must have corona-resistant stator insulation and be rated for 90°C temperature rise with 40°C ambient. * Motors must be listed as "Inverter Duty or Inverter Duty Rated". * Motors must have a service factor of not less than 1.0 when rated for inverter duty. **Additional Requirements** * Motors must have a grounding brush on the driven equipment side to prevent shaft current. * Motors must have a dedicated ground connection between the casing and the grounding lug in the terminal box. * For motors 100HP and larger, an "HF bonding strap" must be provided to bond the motor casing to local structural steel. **Efficiency** * Motors 1 HP and larger must have a premium efficiency and meet or exceed the values listed in the table. **Accessories** * Motor heaters must be provided for motors located outside that are 150 HP and larger. * Winding temperature sensors must be provided for motors 100 HP and larger. * An auxiliary enclosure must be provided to terminate low-voltage devices, such as RTD's and motor heaters. **Execution** * Installation must be done in accordance with drawings, approved shop drawings, and manufacturer's recommendations. * The control of the motor heater circuit must be coordinated with the VFD manufacturer.