Division 16 Electrical

General Provisions

  1. Electrical closets and distribution shall be centrally located throughout the building. Electrical closets and Network closets should stack in a multi-story building.
  2. In atriums or other multi-story open to roof areas, accessibility and maintenance should be a consideration when mounting lights.
  3. Access doors to crawl spaces should be located as close as possible to electrical equipment under floor.
  4. Provide separate electrical and telecommunications closets. Custodial closets shall not be used to house electrical or telecommunications equipment. Refer to the Program Standards for Administrative Services, Information Technology section for more information.
  5. Provide one duplex receptacle for each stair landing.
  6. Corridor wall receptacles (primarily used for floor cleaning equipment) shall be circuited separate from interior office/classroom receptacles.
  7. The Contractor shall submit warranties and guarantees in one commercial quality, hardback binder sized to accommodate 8.5 by 11 inch pages, with a table of contents and two (2) copies of each warranty or guarantee. Marked tabs shall separate warranties and guarantees in sections following the order of the specs.
  8. Electrical engineer shall meet with Plant Services Elec. Dept. (Larry Fisher 330-5974) during the Design Development phase. Electrical wiring system shall be designed and installed with as much flexibility as practical and reasonable.
  9. In demolition associated with renovations, all wire shall be removed back to the panel board and all accessible conduit shall be removed.
  10. For back-up power, emergency generators are preferred to battery systems.
  11. At each location where there are several pay phones grouped together, provide one duplex receptacle for a TTY unit (to be provided by the Owner).
  12. Refer to Program Standards, Instruction for power, data, and lighting information.
  13. When designing a new facility on an existing campus, specify the same (or similar) fixtures and lamps that are prevalent in the existing building(s).

Raceways

Minimum conduit size shall be ¾”. Smaller conduit is acceptable for certain applications if permitted by code. Flexible metal conduit shall be used only for whips to lighting fixtures and equipment. All empty conduit shall have a 65-lb. test polymer (or equivalent) pull string tied off at both ends.

Conductors

  1. Use of MC cable is not permitted.
  2. All conductors shall be copper. All power conductors shall be awg #12 or larger. Minimum control wire shall be awg #14 and minimum signal wire size no smaller than awg #18.

Wiring Devices

All wiring devices shall be industrial heavy duty specification grade, rated a minimum 20A, 125V.

Emergency Generators

Emergency generators rated 50KW or less shall be natural gas with propane backup. Fuel tanks shall not be located underground. Propane tanks shall be furnished by the Owner. Emergency generators rated above 50KW shall be diesel.

Service and Distribution

  1. One line diagram of electrical system shall be posted in the switchgear room or in vicinity of main distribution panel.
  2. Panelboards shall be flush mounted only in areas with grid type ceilings or open ceilings. Do not locate panelboards in custodial closets.
  3. Distribution panelboard shall be provided complete with all mounting hardware for mounting any size breaker that the panel will accept and breakers shall be plug-in type.
  4. Provide a minimum of one 100 ampere, 30 pole panelboard per laboratory.
  5. Provide 50% spare breaker space in each distribution panel in all new buildings. Provide 20% spare breaker space in each panelboard.
  6. All panelboard indices shall identify all equipment served by each circuit, (i.e.: Rcpt - Rooms 111, 112, 115).
  7. Any panelboard spaces shall be fully bussed.

Exterior Lighting Systems

  1. On most campuses CPCC will lease the parking lot light pole fixtures from the local utility. Confirm with the Construction Director. Designer is responsible for coordinating the design and layout with the utility and providing sleeves where required to help facilitate the construction process.
  2. Provide a photo cell and timer for exterior fixtures.
  3. Wall packs to be multi-tap voltage metal halide.

Interior Lighting Systems

  1. Standard light fixtures are 3-lamp, 2’x4’ fluorescent lay-in fixtures with electronic ballasts and T-8 lamps. T-8 lamps shall have low mercury content, a color rendering index of 75 or greater and a color temperature of 4100k in academic and general buildings. High mercury content lamps are unacceptable. The fixture lens shall be a 4” deep semi-specular parabolic with 18 cells for the 3-lamp fixture (24 cell for a 4-lamp fixture). Note that the classroom fixtures are ballasted to allow operation of only one lamp, two lamps, or all three lamps. Refer to Program Standards, Instruction for more information.
  2. Ballasts shall be warranted for 60 months from date of manufacture and shall have harmonic distortion of less than 15%. Ballasts shall be of the parallel lamp connection design such that lamps remain fully lit if any of the companion lamps fail.
  3. Owner requires the use of light emitting diode (LED) lighted exit signs with diffused lenses. Only red lettered exit signs will be used. Exit lights shall be equal to Lithonia Modular xs/xl series.
  4. Use of fluorescent dimming systems is discouraged. When approved, the ballasts shall have a dimming range of 100% to 1%.

Fire Alarm Systems

  1. General: A 20 amp, 120 volt duplex outlet shall be provided within six (6) feet of the fire alarm control panel.
  2. Testing: Specifications shall indicate that Contractor shall guarantee all equipment and wiring free from inherent mechanical and electrical defects for a period of 1 year from the date of acceptance. The manufacturer shall furnish, without additional cost to the Owner, inspection and testing of the fire alarm system for a period of one year after the final acceptance of the system. This shall consist of a minimum of two inspections and follow up tests during the one year period and sensitivity testing of all smoke detectors in the system one month prior to the end of the one year period.
  3. Power Supply: The electrical power for all fire alarm and associated panels shall be supplied through the emergency panel of the building to assure continued operation of the fire alarm systems during times of power interruptions.
  4. Control Panels: Fire alarm control panels shall be located as close as possible to the main entrance to the building and be readily accessible for the responding fire department personnel. Control panels shall be installed with the top of the panel no more than 78 inches above the finished floor. “Readily accessible” shall be defined by the 1996 edition of NFPA 70 (National Electrical Code). Control panel should be installed in (or near) the Security office for the facility. Control panels and any panels associated with the fire alarm system shall not be installed immediately above or below ceilings, in classrooms, electrical closets, offices, conference rooms or residence hall suites or any room that requires entry through these spaces.
  5. Component Installation: All fire alarm system components shall be installed in their manufacturers intended orientation, (i.e. a horn intended by the manufacturer for wall installation only shall not be installed on the ceiling).
  6. Smoke and Heat Detectors: Smoke and heat detectors installed in a location not easily visible from the floor shall have a remote alarm indicator installed as near as possible to the detector and no more than 72 inches above the floor.
  7. Signal Circuits: Notification (signal) circuits shall be wired so that each floor of a building can be isolated for testing purposes.
  8. Wire Coloring and Labeling: All circuits shall be labeled in the fire alarm control panel and in each junction box they pass through. Wire insulation colors shall be consistent for the full length of each circuit and shall not change in the circuit. On all notification circuits, addressable circuits and any 24 volt DC circuit that is polarity sensitive the positive(+) wire shall be red and the negative (-) wire shall be black.
  9. Duct Detectors: Duct detectors located above the ceiling or in any room other than a mechanical room shall have a remote alarm indicator/test switch installed in a corridor as near as possible to the duct detector location, at a height of no more than 72” above finished floor. Duct detectors located in mechanical rooms shall have a remote alarm indicator/test switch installed as near as possible to the entry door and no more than 72 inches above finish floor. The remote indicator should have a sign to indicate the associated duct detector. For all duct detectors located above the ceiling or behind an access door, a sign shall be provided on the ceiling below the duct detector or on the access door indicating the location of the duct detector. Duct detectors located above ceilings that are not drop in type ceilings shall be supplied with an access door of a minimum size of 24” x 24” in the ceiling located to allow access to the duct detector.

Motors and Controls

  1. All motor variable frequency controls shall meet IEEE recommended practices and requirements for harmonic control in electrical power systems. See IEEE standard 519-1992..
  2. Motors of ¾ horsepower and larger shall be 3-phase power of the highest available and appropriate voltage. All such motors shall be equipped with permanently lubricated bearings.

Communication Cabling

Conform to the most current NC State Telecommunications Services “STS-1000, Telecommunications Wiring Guidelines”. CPCC will contract separately for the cabling design and installation. The Architect/Engineer need to coordinate with the cabling design and accommodate space, HVAC, and electrical requirements. A/E need to include the cable tray system in the construction contract for the main distribution of the cabling.