26 05 29 - Electrical Supports, Anchors and Fasteners.pdf

26 05 29 – ELECTRICAL SUPPORTS, ANCHORS AND FASTENERS

Herbert, Rowland & Grubic, Inc. 26 05 29 -1 005153.0436

SECTION 26 05 29 - ELECTRICAL SUPPORTS, ANCHORS AND FASTENERS

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Conduit and equipment supports.

B. Anchors and fasteners.

1.2 REFERENCES

A. NECA - National Electrical Contractors Association.

B. ANSI/NFPA 70 - National Electrical Code.

1.3 RELATED SECTIONS

A. Division 26.

1.4 SUBMITTALS

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

B. Product Data - Provide manufacturer’s catalog data for fastening systems.

C. Manufacturer’s Instructions - Indicate application conditions and limitations of use stipulated by Product testing agency specified under Article 1.05. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of Product.

1.5 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.

PART 2 - PRODUCTS

2.1 PRODUCT REQUIREMENTS

A. Materials and Finishes - Provide products which incorporate corrosion resistance adequate for the conditions in which they are to be installed.

B. Provide materials, sizes, and types of anchors, fasteners and supports to carry the loads of equipment and conduit. Consider weight of wire in conduit when selecting products and designing system supports.

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2.2 STEEL CHANNEL

A. Non-PVC Coated:

1. Ductile Iron:

a. Description - Hot dipped galvanized steel channel designed for use with steel fittings, spring backed washers and nuts.

b. Manufacturers:

1) Kindorf.

2) Uni-Strut.

3) B-Line.

4) Globe.

5) Or equal.

2. Stainless Steel:

a. Description - For the purpose of this Section, all stainless steel shall be

Type 316.

b. All fasteners, fittings, clamps, saddles and accessories shall be stainless steel.

c. Manufacturer:

1) Uni-Strut.

2) B-Line.

3) Or equal.

B. Polyvinyl Chloride (PVC) Coated Materials:

1. Hanger or support shall be hot dipped galvanized including the threads.

2. The zinc surface shall be treated with chromic acid prior to coating to enhance the bond between metal and plastic.

3. All surfaces shall be coated with an epoxy acrylic primer of approximately

0.0005-inch thickness.

4. The PVC coating shall be applied by the liquid fluidized bed method.

5. The coating material shall be compounded of pure materials and shall be free of any fillers or secondary plasticizers or gross, non-uniform characteristics.

6. A PVC coating shall be bonded to the galvanized outer surface of the product.

The bond between the PVC coating and the product surface shall be greater than the tensile strength of the plastic. The thickness of the PVC coating shall be a minimum of 0.040 inch (40 mils) and a maximum thickness of 0.045 inch (45 mils).

7. Finished Color - Manufacturer’s standard.

8. Manufacturers:

a. B-Line Systems, Inc.

b. Perma-Cote Industries.

c. Robroy Industries (Plasti-Bond Red).

d. Kor Kap.

e. OCAL.

f. Or equal.

2.3 FIBERGLASS CHANNEL

A. Description - Pultruded materials of glass strands and polyester resins to form rigid, high strength, non-corrosive, non-flammable structural channels, connectors and fasteners.

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B. Manufacturers:

1. Robroy Industries.

2. Enduro.

3. Aickinstrut.

4. Strut Tech.

5. Or equal.

C. All strut and hanger rods in corrosive areas shall be fiberglass manufactured in a continuous process whereby linear glass strands, continuous mat laminates, and corrosion resistant polyester resins form a uniform rigid thermoset finished shape. The fiberglass parts shall be self-extinguishing with a V-O classification in the UL 94 test for flammability. Hanger rod washers shall be stamped from protruded flat stock. Hex nuts and strut nuts shall be injection molded. Other hardware shall be PVC coated to a nominal 15 mils. The bond between metal and plastic shall be equal to or greater than the tensile strength of the plastic. Manufacturers: Robroy Industries, Kor Kap, or equal.

2.4 CHANNEL CLAMPS

A. Conduit clamps to be used with channels listed above shall be two-piece and sized for the conduit diameter served. Clamp material shall match the channel material.

Manufacturers: Unistrut, B-Line, or equal.

B. Cable clamps to be used with channels listed above shall be two-piece and feature a UV and oil-resistant thermoplastic elastomer bushing to protect cables. Bushing shall be sized to firmly secure the cables without damaging the cable insulation. Manufacturers:

Unistrut, Nvent, or equal.

2.5 TWO-PIECE MALLEABLE IRON CLAMPS

A. Cast malleable iron strap clamp sized to match conduit with mating malleable iron clamp backs (spacers). Clamp back shall be thick enough to provide 1/4-inch standoff from conduit to wall. Cadmium plated anchor and washer. Manufacturer - O-Z/Gedney, Thomas & Betts, Appleton, Raco, or equal.

B. PVC-coated cast malleable iron strap clamp sized to match conduit with mating malleable iron clamp back (spacer). Clamp back shall be thick enough to provide 1/4-inch standoff from conduit to wall. Stainless steel anchor and washer. Manufacturer - Robroy, Thomas & Betts, Ocal, Perma-Cote Industries, Kor Kap, or equal.

PART 3 - EXECUTION

3.1 INSTALLATION

A. General:

1. Install products in accordance with manufacturer’s instructions.

2. Do not fasten supports to pipes, ducts, mechanical equipment, and conduit.

Anchor conduits to or support from structural members only.

3. Fasteners used to wall mount any material or equipment weighing 75 lbs. or more to concrete or masonry shall be adhesive or masonry anchors, Type 316 stainless

Herbert, Rowland & Grubic, Inc. 26 05 29 -4 005153.0436 steel. All floor-mounted equipment and other wall-mounted materials or equipment weighing less than 75 lbs. may be supported via drilled anchors. See Division 5, Concrete and Masonry Anchors.

4. Do not use spring steel clips and clamps.

5. Do not use powder actuated anchors.

6. Do not drill or cut structural members.

7. Install supports in a manner that does not interfere with or weaken the bolts when attaching to structural steel. Obtain the Engineer’s written approval of any drilling or cutting on the structure.

8. Through spaces where surface mounting is not available, install multiple conduits on electrical channel rack, either hung or wall mounted. Provide space on each rack for 25 percent additional conduits.

9. Support conduit passing through above-grade floors so that sealing sleeves or mechanical link seals do not carry the weight of the conduit.

10. Install individual surface mounted conduit with two-piece cast malleable iron clamp assembly.

11. Install surface mounted cabinets and panelboards with minimum of four or six anchors, depending upon the number of normal anchor points. See table at the end of this section.

12. In all locations, use stainless steel channel supports to stand cabinets, panelboards and mounting panels 1/2-inch (12 mm) off wall.

13. Finish of all supports shall be compatible with the conduit system applicable for the area classification where installed.

14. After thorough investigation of architectural, structural and shop drawings related to work to determine how equipment, fixtures, conduit, panelboards, etc.

are to be supported, mounted or suspended, provide:

a. Extra steel bolts, inserts, pipe stands, brackets, or any other items required for proper support.

b. Supporting accessories where required, whether or not shown on

Drawings.

15. Refer to details on the Contract Drawings for free-standing and railing-mounted construction and for any other details of special conditions. For other situations, the Contractor shall, prior to installation, submit mounting details to the Engineer for approval.

B. Support Applications:

1. Unclassified Areas - Galvanized steel channel system or malleable iron clamps.

2. Interior Hazardous Areas - PVC-coated channel.

3. Interior Corrosive (Polymer) Areas - Fiberglass reinforced plastic channel system.

4. Interior Wet Areas - Stainless steel channel system.

5. Exterior Areas - Stainless steel channel system.

C. Anchor and Fastener Application Schedule - See schedule at end of this section.

D. Support Spacing:

1. Metallic Conduit - Not more than 8 feet on center. Types A, A-1, and E within 3 feet of each outlet box, junction box, cabinet or fitting.

2. Non-Metallic Conduit:

a. Sizes up through 1-1/4-inches diameter - not more than 3 feet on center.

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b. Sizes 1-1/2-inches diameter and larger - Not more than 4 feet on center.

c. Within 18 inches of each outlet box, junction box, cabinet or fitting.

3. Maximum Deflection:

a. Metallic Conduit - 1/100th of span between supports.

b. Non-Metallic Conduit - 1/360th of span between supports.

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ANCHOR AND FASTENER APPLICATION SCHEDULE

ITEM CATEGORY

MOUNTING SURFACES

WOOD,

PLYWOOD

WALLBOARD, GYPSUM,

FRP, COMPOSITION

HOLLOW

MASONRY

SOLID

MASONRY

CAST

CONCRETE

SHEET

METAL

Individual conduit F G D A A E

Steel/FRP channel F, I D D A A E

Structures; i.e., conduit rack, cable tray F, I D D A A --

Devices and equipment less than 75 lbs. (Note 5) I Note 1 D A A Note 2

Devices and equipment 75 lbs. or more (Note 4) I Note 2 H B, H, J B, C, H Note 2

Mounting panels (Note 3) I Note 1 D B, H, J B, C, H Note 2

Key to Anchor Types:

A - Drilled (lead insert in masonry, expansion bolt in concrete) B - Adhesive anchor C - Cast-in-place insert D - Toggle bolt, hollow wall fastener E - Sheet metal screw F - Wood screw G - Sheet rock screw H - Through bolt I - Lag screw J – Masonry anchor

In wet, exterior, corrosive, or hazardous areas, all fasteners and anchors shall be Type 316 stainless steel. In all unclassified areas, cadmium-plated fasteners shall be used, except grouted anchors shall be Type 316 stainless steel.

Notes:

(1) Support via plywood mounting panel lagged to studs or via electrical channel lagged to studs.

(2) Do not mount to these surfaces.

(3) Panels mounted to masonry or concrete surfaces shall have 1/2-inch air space between surface and panel via stainless steel spacers.

(4) Provide two additional support connections; minimum of four or six, depending on number of normal connection points. This requirement may necessitate fabricating the additional connections. Maintain NEMA rating of enclosure.

(5) Use adhesive or masonry anchors for all exterior conduit supports.

END OF SECTION