Bid No. 86513
Building 8 Swing Space Revisions
Section 16110 CONDUITS, RACEWAYS AND FITTINGS
Part 1 GENERAL
1.01. Description of Work:
A. The work of this section consists of furnishing and installing conduits, raceways and fittings for above grade installations, underground duct installations and inside buildings as shown on the Drawings and as described herein.
1.02. Related Work:
A. See the following specification sections for work related to the work in this section:
1. 16120 Low Voltage Wire and Cable.
2. 16130 Junction and Pull Boxes
1.03. Standards and Codes:
A. Work and material shall be in compliance with and according to the requirements of the latest revision of the following standards and codes.
1. California Electrical Code (CEC).
a. 230.8 Raceway Seal.
b. 300.5(G) Raceway Seals.
2. American National Standards Institute (ANSI):
a. C80.1 Specification for Zinc Coated Rigid Steel Conduit.
b. C80.3 Specification for Zinc Coated Electrical Metallic Tubing.
3. Federal Specifications (FS):
a. A-A-55810 Flexible Metal Conduit.
4. National Electrical Manufacturers Association (NEMA):
a. TC 2 Electrical Polyvinyl Chloride (PVC) Tubing and Conduit (EPC 40 and EPC 80).
5. Underwriters Laboratories (UL):
a. 797 Electrical Metallic Tubing - Steel.
b. 360 Liquid-Tight Flexible Steel Electrical Conduit.
c. 514B Fittings for Cable and Conduit.
d. 6 Rigid Metal Conduit.
e. 651 Schedule 40 and 80 Rigid PVC Conduit.
f. 1479 Fire Tests of Through-Penetrations Firestops.
g. 1 Flexible Metal Conduit.
A. As specified in Division 1 and Section 16010.
B. Catalog Data: Provide manufacturer's descriptive literature.
C. Single Submittal: A single complete submittal is required for all products covered by this Section.
Part 2 PRODUCTS
2.01. Conduits, Raceways:
A. Galvanized Rigid Steel Conduit (GRS) shall be hot-dip galvanized after fabrication, conforming to ANSI C80.1 and UL 6.
B. Flexible Conduit: Flexible metal conduit (Greenfield) shall be galvanized steel or aluminum interlocked from a continuous metal strip and shall conform to UL 1 and FS A-A-55810.
C. Weathertight Flexible Conduit: Weathertight flexible metal conduit shall be liquid-tight (Sealtight) of galvanized steel interlocked from a continuous metal strip with an extruded polyvinyl chloride cover and shall conform to UL 360 and FS A-A-55810.
D. Electrical Metallic Tubing (EMT) shall be hot-dip galvanized after fabrication, conforming to ANSI C80.3 and UL 797.
E. Rigid Non-metallic Conduit: Rigid non-metallic conduit for concrete encasement shall be Type EB, all others shall be PVC Schedule 40 (PVC-40 or NEMA TC2 Type EPC-40) conduit approved for underground use and for use with 90C wires, and shall conform to UL 651.
2.02. Conduit Supports:
A. Supports for individual conduits shall be galvanized malleable iron one-hole type with conduit back spacer.
B. Supports for multiple conduits shall be hot-dipped galvanized Unistrut or Superstrut channels, or approved equal. All associated hardware shall be hot-dip galvanized.
C. Supports for EMT conduits shall be galvanized pressed steel single hole straps.
D. Clamp fasteners shall be by wedge anchors. Shot in anchors shall not be allowed.
A. Provide threaded-type couplings and connectors for Galvanized Rigid Steel (GRS) conduits. Set-screw type and compression-type are not acceptable. Union couplings shall be the Erickson type. Threadless couplings shall not be used. Provide threaded couplings and raintight conduit (“Meyers”) hubs for rigid steel conduit exposed to weather. Fittings shall be galvanized steel or galvanized cast ferrous metal; access fittings shall have gasketed cast covers.
B. Provide set-screw type or compression-type couplings and connectors for Electrical Metallic Tubing (EMT) conduits.
C. Fittings for Weathertight Flexible Metal conduit shall have neoprene gaskets.
D. Fittings for use with Rigid Non-metallic Conduit shall be PVC and have solvent-weld-type conduit connections.
A. Bushings shall be the insulated type.
B. Bushings for rigid steel shall be insulated grounding type.
2.05. Conduit Sealants:
A. Fire Retardant Types: Fire stop material shall be reusable, non-toxic, asbestos-free, expanding, putty type material with a 3-hour rating in accordance with UL 1479.
Part 3 EXECUTION
3.01. Conduit, Raceway and Fitting Installation:
A. Installation shall comply with the CEC.
B. Provide a nylon pull cord in each empty raceway.
C. The minimum size raceway shall be 3/4-inch unless indicated otherwise on the Drawings.
D. From pull point to pull point, the sum of the angles of all of the bends and offset shall not exceed 270 degrees regardless of direction.
E. Treat cut steel surfaces or damaged ends with corrosion-resistant coating such as "Devcon Z", prepared by Subox Coatings, Hackensack, NJ, or equal. Application shall follow manufacturer's recommendation.
F. All exposed conduit and hardware shall be painted per spec section 16010.
A. Galvanized rigid steel conduit shall be used for all above ground exterior work, for exposed interior work up to eight feet above finished floor, and for work embedded in concrete unless otherwise noted.
B. Rigid non-metallic conduit (PVC) for all underground exterior work, unless otherwise noted.
C. Electrical Metallic Tubing (EMT) shall be used for interior concealed work or above eight feet exposed as acceptable to the local authority having jurisdiction.
D. Flexible Metal conduit (Greenfield) shall be used for interior work in short lengths (six foot maximum) for the connection of recessed lighting fixtures, motors, and any vibrating equipment, unless otherwise noted or where liquid tight flexible metal conduit is required.
E. Weathertight Flexible Metal conduit (Sealtight) shall be used wherever flexible conduit is required and moisture may be present.
1. Provide liquid tight flexible metal conduit for all motors in mechanical equipment spaces, for any vibrating equipment where moisture may be present, and when making connections between two building structures.
A. Run all concealed conduits above ceilings and inside walls parallel to building lines, unless otherwise noted.
B. Run all exposed conduits parallel to building lines, unless otherwise noted.
C. Coordinate conduit locations with equipment, fixtures, and with structural and architectural elements. Conduits attached to walls or columns shall be as unobtrusive as possible and shall avoid windows.
3.04. Conduit Supports: Properly support all conduits as required by the CEC. Wherever possible, run all conduits concealed except where otherwise shown on the drawings.
A. Conduits shall not be supported from ceiling support wires. Provide "J" hangers on threaded rods or multiple conduits on trapezes consisting of Unistrut or Superstrut channels, or approved equal, supported by minimum 3/8" threaded rod from the structure above. Conduits shall not be supported from ductwork, water, fire sprinkler or HVAC lines.
B. Exposed Conduits:
1. Support exposed conduits within three feet of any junction box, coupling, equipment, fixture or device and at intervals not exceeding CEC requirements.
2. Wherever possible, group conduits together and support on common supports located away from walls. Support exposed conduits fastened to the surface of the concrete structure by one-hole clamps, or with channels. Use conduit spacers with one-hole clamps.
3. Group together exposed conduits in horizontal runs and support on trapeze hangers unless otherwise noted. Arrange such conduits uniformly and neatly. Trapeze hangers shall consist of channels of adequate size, suspended by means of rods or other suitable means from the ceiling or from pipe hangers.
4. Support conduit risers in shafts with Unistrut or Superstrut channels, or approved equal and straps.
3.05. Moisture Seals: Provide in accordance with CEC paragraphs 230.8 and 300.5(G).
3.06. Flexible Conduit:
A. Flexible metallic conduit shall have a maximum length of six feet unless otherwise noted.
B. Flexible metallic conduit shall not be considered as a ground conductor. Flexible metallic conduit shall be installed only in exposed or accessible locations. Fixture whips may be a maximum of six feet. Fixture whips provided by light fixture manufacturers may be maximum of twelve feet in length.
3.07. Underground Raceway:
A. Conduits embedded in concrete floors on grade shall be installed between grids of reinforcing steel, or shall be encased below the floors, provided the concrete is thickened as shown on the Drawings. EMT shall not be embedded in concrete.
B. Slope all underground raceways to provide drainage; for example, slope conduit from equipment located inside a building to the pull box or manhole located outside the building.
C. All PVC conduits terminating into pull boxes and vaults shall be provided with bell fittings at ends.
D. PVC direct buried conduits shall be installed in soil, covered with sand under a warning tape and compacted soil. Minimum depth 18" below grade. All PVC conduit installed below grade shall be provided with galvanized rigid steel 90's and risers. Rigid Steel shall be wrapped with 20 mil tape and extend minimum 12" above finished grade.
E. PVC conduits installed under slabs shall be installed in soil, covered with sand under a vapor barrier and crushed rock. Minimum depth 6" below slab. All PVC conduit installed below slab shall be provided with galvanized rigid steel 90's and risers. Rigid steel shall be wrapped with 20 mil tape and extend minimum 12" above finished grade.
3.08. Storage: Store rigid PVC conduit on a flat surface and shielded from the sun. PVC conduits 3" and larger shall be provided with 48" radius bends.
end of section