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January 21, 2022
The University’s standards now include new guidance on material use and revisions to electrical and mechanical equipment applications. Of these fourteen updates to design documents, Facilities’ engineers also revised the requirements for mechanical motors, valves, piping, and pumps. The following are the most fitting highlights.
For Yale’s electrical standards, current transformer requirements were updated to remove specific model numbers that may be obsolete or have long acquisition lead times. Instead, the unit substation and automatic transfer switch standards still state requirements for current transformers but no longer list a specific model number or manufacturer. The electrical panelboard standard now includes National Electrical Manufacturers Association (NEMA) enclosure requirements for conditioned and unconditioned spaces. The enclosed bus assemblies standard was modified to include forced cooled assemblies and condensation requirements. Lastly, the variable frequency drives standard was revised to accept six pulse drives that have an ultra-low harmonic design.
For Yale’s mechanical standards, a new guide details bearing protection for motors. The general duty valves, valve service index, and piping standards now include additional valve types, alignment with central utility plant valve types, and inclusion of pro-press as an acceptable piping system for some water-based systems. The hydronic pump standard includes more specific detail on the requirements and locations of strainers. New manufacturers were included as acceptable options within the steam pressure reducing stations and steam traps standards.
All the University’s new and updated standard divisions can be found online.
Many thanks to all the staff who contributed their time and thoughts for this release. Cross-departmental collaboration continues to improve Facilities’ projects and operations. Please keep your suggestions coming in the New Year!
Currently in development are new requirements for lighting, including indoor lighting controls and exterior lighting. Look out for these advanced standards later in 2022, or inquire with Facilities’ engineers if you would like a preview.