Specifications include, but are not limited to: A. The completed Work shall comply with the following requirements. 1. Lighting circuit design loads shall be limited to 1,500 volt-amperes (120-volt circuits) as calculated according to NFPA 70 (NEC). 2. Receptacle circuit design loads shall be limited to 1,500 volt-amperes as calculated according to NFPA 70 (NEC). One receptacle outlet shall be provided on each wall in each office, and a junction box shall be provided above the accessible ceiling of each office. B. Description of Conductor Installation Requirements 1. Conductor and conduit sizes noted on Drawings are based on type THHN copper unless noted otherwise. 2. Conductor material applications: a. Feeders for panelboards, switchboards, and other distribution equipment: Copper for feeders smaller than No. 4 AWG; copper or aluminum for feeders No. 4 AWG and larger. It is the responsibility of the contractor to provide wire and conduit of equal ampacity to the copper conductors shown unless specific Aluminum wire and conduit sizes are indicated. 3. Branch Circuits: Copper. Solid for No. 12 AWG and smaller; stranded for No. 10 AWG and larger. a. Use stranded conductors for control circuits. b. Use conductor not smaller than 12 AWG for power and lighting circuits. c. Use conductor not smaller than 16 AWG for control circuits. d. Use 10 AWG conductors for 20 ampere, 120 volt branch circuits longer than 60 feet. C. Wiring Methods 1. Branch Circuits: a. Multi-wire branch circuits shall not be acceptable. Provide dedicated neutral conductor for each circuit. b. Home Runs (from circuit breaker to junction box at accessible location adjacent to first wiring device): Type THHN-THWN single conductors in raceway. c. Exposed (including in crawl spaces, electrical rooms, mechanical rooms, and above accessible ceilings): Type THHN-THWN single conductors in raceway. d. Concealed (e.g. in ceilings, walls, partitions): Type THHN-THWN single conductors in raceway. e. Concealed (e.g. in ceilings, walls, partitions): Type THHN-THWN single conductors in raceway or multi-conductor cable Type MC. 1) MC cable is generally permitted to installed concealed within walls or above non-accessible ceilings only. Limit exposed runs of MC cable above accessible ceilings to 8’ and install parallel or perpendicular to building lines. 2) All homeruns to be single conductors in raceway, and each homerun shall have a junction box installed above the accessible ceiling. 3) Type MC cable shall not be installed where it is subject to physical damage. 4) Class 1 Control Circuits: Type THHN-THWN single conductors in raceway. 2. Class 2 Control Circuits: a. For lighting control devices (occupancy sensors, low-voltage switches, etc.), exposed multi-conductor cable, plenum rated shall be acceptable in concealed locations. Install cabling in accordance with section 27 0528. b. Unless otherwise noted all other locations use type THHN-THWN single conductors in raceway.
