26 05 33.16 - Boxes.pdf

26 05 33.16 - BOXES

Herbert, Rowland & Grubic, Inc. 26 05 33.16-1 005153.0436

SECTION 26 05 33.16 -BOXES

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Outlet and device boxes.

B. Pull and junction boxes.

1.2 RELATED SECTIONS

A. Division 26.

1.3 REFERENCES

A. ANSI/NEMA FB 1 - Fittings and Supports for Conduit and Cable Assemblies.

B. ANSI/NEMA OS 1 - Sheet steel Outlet Boxes, Device Boxes, Covers, and Box Supports.

C. ANSI/NEMA OS 2 - Nonmetallic Outlet Boxes, Device Boxes, Covers and Box Supports.

D. ANSI/NFPA 70 - National Electrical Code.

E. NEMA Standards Publication No. 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

1.4 SUBMITTALS

A. Submit under provisions of 01 33 00 - Submittals and 26 05 00 – Electrical-General.

B. Submit:

1. Boxes larger than 100 cubic inches.

2. Pullboxes.

3. Junction boxes.

4. Concrete manholes and handholes. Include detailed drawings showing all reinforcing steel, loadings, concrete strength, and all sizing.

5. Cast iron manhole and handhole covers.

6. Non-metallic polymer concrete handholes.

1.5 PROJECT RECORD DOCUMENTS

A. Submit under provisions of 01 78 39 - Project Record Documents and 26 05 00 – Electrical- General.

B. Accurately record actual locations and mounting heights of pull and junction boxes.

C. Accurately record and indicate the size and location of all conduits into and out from all manholes, handholes, and buried pullboxes. Indicate circuit number, size, quantity, source, and destination of all conductors in each circuit.

Herbert, Rowland & Grubic, Inc. 26 05 33.16-2 005153.0436

D. Measure and record ties from permanent structures to the center of each cover or box with two ties 90 degrees apart

1.6 REGULATORY REQUIREMENTS

A. Conform to requirements of ANSI/NFPA 70.

B. Furnish products listed and classified by Underwriters Laboratories, Inc. or other third-party testing firm acceptable to authority having jurisdiction as suitable for purpose specified and shown.

1.7 PROJECT CONDITIONS

A. Verify field measurements are as shown on Drawings.

B. Verify locations of boxes and outlets in all areas prior to rough in.

PART 2 - PRODUCTS

2.1 OUTLET AND DEVICE BOXES

A. Nonmetallic Outlet Boxes - ANSI/NEMA OS 2:

1. Polyvinyl chloride, molded; fiberglass reinforced plastic with molded conduit sockets and mounting flange.

2. Minimum 18 cubic inch capacity.

3. Manufacturers:

a. Carlon.

b. Allied Moulded Products, Inc.

c. Raco, Inc.

d. Or equal.

B. Cast Boxes - NEMA FB 1:

1. Cast, copper-free aluminum or cast iron alloy to match conduit systems.

a. For PVC-Coated conduit systems, provide PVC coated boxes and fittings by the same manufacturer as the conduit system.

2. Type FD and FS box with integral mounting lugs and heavy duty threaded hub(s).

3. Provide gasketed cover by box manufacturer.

4. Manufacturers:

a. Crouse-Hinds.

b. Appleton.

c. Killark.

d. O-Z/Gedney.

e. Or equal.

2.2 PULL AND JUNCTION BOXES

A. Sheet Metal Boxes - NEMA OS 1:

1. Galvanized steel, without knockouts.

2. Finish - Painting.

Herbert, Rowland & Grubic, Inc. 26 05 33.16-3 005153.0436

3. NEMA rated per Section 26 27 16, Control Panels and Enclosures.

4. Hinged cover.

5. Gasketed cover in wet areas.

6. Manufacturers:

a. Hoffman.

b. McKinstry.

c. Or equal.

B. Surface-Mounted Cast Metal Box - NEMA Publication No. 250, Type 4; flat flanged, surface mounted junction box:

1. Material - Cast aluminum.

2. Cover - Furnish with ground flange, neoprene gasket, and stainless steel cover screws.

C. Non Metallic Junction Boxes:

1. Polyester reinforced fiberglass.

2. Closed cell neoprene gasketed door.

3. Screw cover door with stainless steel screws.

4. Nonconductive.

5. Ignition temperature minimum - 520 degrees C.

6. Dimensional stability of 168 hours in accordance with ASTM D1042.

7. Manufacturers - Robroy, Hoffman, Crouse Hinds, Carlon, or equal.

D. Stainless Steel Boxes:

1. Material – 316 stainless steel.

2. NEMA 4X.

3. Continuous hinge.

4. Formed-in-place (FIP) gasket.

5. Stainless steel back panel.

6. Manufacturers:

a. Saginaw.

b. Hoffman.

c. Or equal.

2.3 CONCRETE MANHOLES, HANDHOLES, AND CAST IRON COVERS

A. Precast concrete boxes shall be in accordance with the details shown on the Contract Drawings.

B. Pulling irons located adjacent to and below duct windows.

C. Pulling Irons - 3/4 inch diameter, cold rolled steel, unless otherwise noted.

D. Manhole Covers in Pavement or Gravel Drives or Where Otherwise Specified - Cast iron frames and covers per the Contract Drawings.

E. A sump shall be provided in each manhole.

F. Pullbox and Junction Box Covers - Concrete for H-20 loading.

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G. Manufacturers – A PCI, NPCA, or DOT certified plant.

1. Monarch Products.

2. By-Crete.

3. Modern Precast Concrete Products.

4. Or equal.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install electrical boxes as shown on Drawings, and as required for splices, taps, wire pulling, equipment connections and compliance with regulatory requirements.

B. All boxes shall be installed level and plumb.

C. Install electrical boxes to maintain headroom and to present neat mechanical appearance.

D. Install pull boxes and junction boxes above accessible ceilings and in unfinished areas only.

E. Inaccessible Ceiling Areas - Install outlet and junction boxes no more than 6 inches (150

mm) from ceiling access panel or from removable recessed luminaire.

F. Junction boxes over 100 cubic inches shall be provided with terminal strips for joining conductors.

G. Contractor shall size all junction boxes in accordance with the NEC unless otherwise shown or noted.

H. In all finished areas, device, outlet, and junction boxes may be galvanized sheet metal. In all other areas, device, outlet, and junction boxes shall be cast metal, except NEMA 12 metal boxes may be used in unfinished and unclassified areas.

I. Boxes in corrosive, wet or explosion proof areas shall be rated for their location and shall be cast aluminum with coatings to match conduit system.

J. Boxes installed outdoors and in wet locations that are not required to be explosion proof shall be NEMA 4X Stainless Steel.

K. Boxes, where Type D or D-1 conduit is specified or shown, shall be nonmetallic.

L. Install boxes to preserve fire resistance rating of partitions and other elements.

M. Align adjacent wall mounted outlet boxes for switches, thermostats, and similar devices with each other.

N. Use flush mounting outlet and device boxes in finished areas.

Herbert, Rowland & Grubic, Inc. 26 05 33.16-5 005153.0436

O. Do not install flush mounting boxes back to back in walls; provide minimum 6-inch (150

mm) separation. Provide minimum 24 inches (600 mm) separation in acoustic rated walls.

P. Secure flush mounting box to interior wall and partition studs. Accurately position to allow for surface finish thickness.

Q. Use stamped steel bridges to fasten flush mounting outlet and device boxes between studs.

R. Install flush mounting box without damaging wall insulation or reducing its effectiveness.

S. Use adjustable steel channel fasteners for hung ceiling outlet box.

T. Do not fasten boxes to ceiling support wires.

U. Support boxes independently of conduit, except cast box that is connected to two rigid metal conduits both supported within 12 inches (300 mm) of box. Unless box supports a luminaire, then support the box as well.

V. Use cast gang boxes where more than one device is mounted together. Do not use sectional box.

W. Use gang box with plaster ring for single device outlets.

X. Use cast outlet box in exterior locations exposed to the weather and wet locations.

Y. Large Pullboxes - Boxes larger than 12 inches (300 mm) in any dimension, use hinged cover enclosures under provisions of Section 26 27 16 - Electrical Panels And Enclosures.

END OF SECTION