SECTION 16122 BRANCH CIRCUITS

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 16122 BRANCH CIRCUITS


PART 1 GENERAL

1.1 RELATED REQUIREMENTS

A. Applicable requirements of Division 0 and Division 1 shall govern work in this Section.

1.2 SCOPE

A. Provide a branch wiring system to serve lighting, receptacle, instrument, motor and equipment loads as indicated on the drawings and as specified herein.

1.3 QUALITY ASSURANCE

A. Reference Standards of the National Electrical Contractors Association (NECA), Standard of Installation.


PART 2 PRODUCTS

       A. Not used.


PART 3 EXECUTION

3.1 GENERAL

A. Conductors shall be size 12 AWG minimum (unless otherwise noted) for branch circuit wiring, including motor circuits.

B. Size 120V branch circuits for length of run on following basis:
1. 0 to 75 ft run from panelboard to first outlet:  No. 12 AWG minimum.
2. 75 to 125 ft run: increase one wire size, i.e., No. 12 AWG becomes No. 10 AWG.
3. 126 to 200 ft run: increase two wire sizes, i.e., No. 12 AWG becomes No. 8 AWG.
4. 201 and above: wiring to be sized for 3% maximum voltage drop.

C. Provide individual neutral conductors for branch circuits serving isolated ground receptacles and computer equipment. (No common neutrals for these circuits.)

D. Voltage drop for branch circuits and feeder circuit combined shall not exceed requirements of NEC Article 220.

E. Route branch circuits and switch legs as dictated by construction, these specifications, or instruction from Engineer.

F. Size conduit, outlet boxes, and other raceway system components in accordance with NEC requirements as minimum.

G. Do not draw conductor into conduits until building is enclosed and watertight and work which may cause cable damage has been completed.

H. Circuit numbers as shown on drawings are for Contractor to plan his wiring and for estimating purposes and are not necessarily the exact circuit numbers to be used in that panel for that particular load.  Exact circuit numbers for each load are to be selected by the Contractor at his option. Balanced load on panelboard bus is to be determining factor in arrangement of circuits. Panelboards average load shall not differ from phase to phase by +/- 7½%.

3.2 MOTOR AND EQUIPMENT WIRING

A. Furnish and install motor circuits in accordance with any schedules on drawings and code requirements, from source of supply to associated motor starter, and from starter to motor terminal box, including necessary and required intermediate connections.

B. Conductor and conduit size for motor branch circuits, if shown on drawings, are sized for motor requirement only.

C. Motors shall have proper feeders as per NEC and nameplate ratings. Contractor is responsible for verification of ratings of motors and installing proper branch circuits.

D. Obtain manufacturer's wiring diagrams and shop drawings for equipment requiring electrical connections.

E. Check drawings and specifications of other divisions of work for equipment and work which shall be included in order to provide a complete electrical installation.

F. Motor connections shall be made by compression type connectors using proper tools and fittings to assure good electrical continuity and low resistance joint.

3.3 INSPECTION

A. Examine areas and conditions under which branch circuits are to be installed and notify Engineer in writing of conditions detrimental to proper and timely completion of work.

B. Do not proceed with work until unsatisfactory conditions have been corrected.

3.4 INSTALLATION

A. Install in accordance with manufacturer's written instructions and in accordance with recognized industry practices

B. Install branch circuit and control wiring system as indicated in drawings.

C. Use color-coding to identify conductors as indicated in Section 16120.



END OF SECTION