Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Title:15900 – Direct Digital Control SystemPage #:31 of 407. Identify all control wires with labeling tape or sleeves using either words, letters,or numbers that can be exactly crossreferenced with asbuilt drawings.8. Identify controlled devices with 1 inch by 3 inch engraved brass or laminatedplastic nameplates with 3/8 inch high lettering. Plastic nameplates shall be 1/8inch thick, black with white letters. Nameplates shall show point identificationnumber as shown on control record drawings and a plaintext device description,e.g., "D3 OUTSIDE AIR DAMPER".9. Junction box covers will be marked to indicate that they are a part of the FMSsystem.B. Enclosures:1. All enclosures to be NEMA 12, unless otherwise required for intended service.All controls and instruments shall be logically assembled at one or more panels,have hinged doors and be marked with engraved labels. No more than two keysshall be necessary to operate all locks.2. All enclosures used as a mounting site for control devices shall also contain ametal or plastic documentation holder located on the inside of the door.3. All enclosures which are used as a mounting for control devices shall beprovided with, and only with locks keyed to Owner’s standards.C. Wiring And Conduit:1. Install wiring and conduit in accordance with Division 16. Control wiring runexposed or surface mounted shall be run in raceway in finished spaces. Conduitmay be used in lieu of raceway in unfinished spaces such as storage rooms andmechanical rooms.2. The term wiring is construed to include furnishing of wire, conduit,miscellaneous material and labor to install a working system.3. Outdoor installations shall be of waterproof construction or in NEMA 3R or 4enclosures.4. The manufacturer's recommendations shall only be used as a minimumrequirement.5. Minimum wire size shall be 10 Ga. for ground, 12 Ga. for 120 VAC power 18Ga. for actuator power and 18 Ga. for switched output. All wires shall be sizedper the NEC for the load serviced.6. All low voltage energy limited wiring (except 24 VAC power), installed in opentray or installed as open wiring, shall be in jacketed cables dedicated toindividual devices.7. All wiring contained in metal wireways shall be in wireways dedicated to lowvoltage service.8. Low voltage energy limited wiring shall not be run in the same wireways with orclosely parallel to high voltage or switched power wiring. Interposing relaysshall be used for all switched power loads and shall be located such that theDIRECT DIGITAL CONTROL SYSTEMS1597231