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SECTION 26 05 29 - HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS
PART 1 - GENERAL
1.01 SUMMARY
A. This Section includes the following:
1. Hangers and supports for conduit, boxes and other electrical equipment and systems.
2. Construction requirements for concrete bases.
1.02 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
B. General Requirements specifically applicable to Division 26 in addition to Division 00 and
Division 01 provisions.
C. Division 03 – Concrete.
D. Division 26.
E. Division 27.
F. Division 28.
1.03 REFERENCES
A. Review the Drawings and all sections of the Specifications for equipment furnished by other
Contractors and the Owner throughout the entire project.
B. See references noted in Specification Section 26 05 00, Paragraph 1.03.
C. ANSI/ASTM/TIA/EIA-568-B.
D. ANSI/ASTM/TIA/EIA-569-A.
E. AISI – American Iron and Steel Institute.
F. UL Standard 2239 – Hardware for the Support of Conduit, Tubing and Cable.
1.04 DEFINITIONS
A. EMT: Electrical metallic tubing.
B. IMC: Intermediate metal conduit.
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C. RMC: Rigid metal conduit.
1.05 SYSTEM DESCRIPTION
A. Supporting devices for electrical equipment.
1.06 PERFORMANCE REQUIREMENTS
A. Design supports for multiple raceways capable of supporting combined weight of supported
systems and its contents.
B. Design equipment supports capable of supporting combined operating weight of supported
equipment and connected systems and components.
C. Rated Strength: Adequate in tension, shear, and pullout force to resist maximum loads
calculated or imposed for this Project, with a minimum structural safety factor of five times the
applied force.
1.07 SUBMITTALS
A. Submit shop drawings and product data under provisions of Division 01 and Section 26 05 00.
B. Product Data: For the following:
1. Steel slotted support systems.
2. Nonmetallic slotted support systems for areas identified as “Corrosive” on the contract
drawings.
C. Test data and certifications on anchors as requested by Architect.
1.08 QUALITY ASSURANCE
A. Support systems shall be adequate for weight of equipment and conduit, including wiring,
which they carry.
B. Coordinate size, shape, and location of concrete pads with Division 03.
C. All concrete pads shown are provided under Division 03. Any pads not shown that are
required by this Contractor shall be provided in accordance with Division 03 and paid for by
this Contractor.
D. Certification of Compliance for all anchoring hardware, in accordance with::
1. AISI.
2. ASTM.
3. UL.
E. Comply with NFPA 70.
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1.09 COORDINATION
A. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases.
Concrete, reinforcement, and formwork requirements are specified in Division 03.
B. Coordinate installation of roof curbs, equipment supports, and roof penetrations. These items
are specified in Division 07 Section "Roof Accessories."
1.10 PROJECT CONDITIONS
A. Verify that concrete is completely cured prior to installing any anchoring devices in the
concrete.
B. Verify that building elements are suitable for securing of anchors:
1. DO NOT secure anchors to any of the following materials: Glazed tile units, clay tiles
units, hollow brick, pre-stressed concrete planks or members.
1.11 DELIVERY, STORAGE AND HANDLINGRELATED DOCUMENTS
A. Deliver, store and handle materials in accordance with Division 01 and Section 26 05 00.
1.12 SEQUENCING AND SCHEDULING
A. Sequence and Schedule work in accordance with Division 01 and Section 26 05 00.
1.13 WARRANTY
A. Warranty in Accordance with requirements of Division 01 and Section 26 05 00.
PART 2 - PRODUCTS
2.01 MANUFACTURERS
A. Hangers and Support Wires:
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Allied/Power Strut.
b. B-Line, Systems, Inc.
c. Caddy/Erico Products.
d. Midwest Electric.
e. Minerallac.
f. O-Z/Gedney.
g. Hilti.
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B. One and Two Hole Straps:
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Allied/Power Strut.
b. Appleton Electric Company.
c. Midwest Electric.
d. Steel City/American Electric.
e. Thomas and Betts.
f. O-Z/Gedney.
C. Racks and Supports:
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Allied/Power Strut.
b. B-Line, Systems, Inc.
c. Global Metal Products Division, USG Industries, Inc.
d. Kindorf/American Electric.
e. Unistrut Corporation.
f. Wesanco.
D. Steel Slotted Support Systems: Comply with MFMA-4, factory-fabricated components for field
assembly.
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Allied/Power Strut.
b. B-Line, Systems, Inc.
c. ERICO International Corporation.
d. GS Metals Corp.
e. Thomas & Betts Corporation.
f. Unistrut; Tyco International, Ltd.
E. Nonmetallic Slotted Support Systems: Structural-grade, factory-formed, glass-fiber-resin
channels and angles with 9/16-inch diameter holes at a maximum of 8 inches o.c., in at least 1
surface.
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Allied Tube & Conduit.
b. Cooper B-Line, Inc.; a division of Cooper Industries.
c. Fabco Plastics Wholesale Limited.
d. Seasafe, Inc.
F. Powder-Actuated Fasteners:
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Hilti Inc.
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b. ITW Ramset/Red Head; a division of Illinois Tool Works, Inc.
G. Mechanical-Expansion Anchors:
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Cooper B-Line, Inc.; a division of Cooper Industries.
b. Hilti Inc.
c. ITW Ramset/Red Head; a division of Illinois Tool Works, Inc.
2.02 SUPPORT, ANCHORAGE, AND ATTACHMENT COMPONENTS
A. Support Channel and hardware:
1. Support channel and hardware used on exterior of building, or in below grade tunnels
or unconditioned basements to be constructed of one or more of the following:
a. AISI 303/304 Grade stainless steel.
b. Steel with hot-dip galvanized (HDG) coating with a minimum thickness of 50
micrometers.
c. Steel with mechanically deposited zinc coating with thicknesses between 5
and 107 micrometers. Thickness shall be as required for environmental
conditions of installations.
2. Support channel and hardware used in swimming pools, in pool equipment rooms and
greenhouses to be ASI Grade 303/304 stainless steel.
B. Concrete Anchors:
1. For single strap conduit support, light fixture safety cables: Powder-actuated
fasteners; Hilti DX series or equal.
2. For threaded rod support of cable tray, transformers, and other equipment: Drop-in
type anchor; Hilti HDI/HDI-L series, or equal.
3. Anchors shall be suitable for material secured into and load on anchor.
C. Solid Brick Anchors: Sleeve type anchors; Hilti HLC Series, or equal:
1. Anchors shall be suitable for material secured into and load on anchor.
D. Hangers, Straps and Hardware: Corrosion resistant.
E. Steel Slotted Support Systems: Comply with MFMA-4, factory-fabricated components for field
assembly.
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Allied Tube & Conduit.
b. Cooper B-Line, Inc.; a division of Cooper Industries.
c. ERICO International Corporation.
d. GS Metals Corp.
e. Thomas & Betts Corporation.
f. Unistrut; Tyco International, Ltd.
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2. Metallic Coatings: Hot-dip galvanized after fabrication and applied according to
MFMA-4.
3. Nonmetallic Coatings: Manufacturer's standard PVC, polyurethane, or polyester
coating applied according to MFMA-4.
4. Painted Coatings: Manufacturer's standard painted coating applied according to
MFMA-4.
5. Channel Dimensions: Selected for applicable load criteria.
F. Nonmetallic Slotted Support Systems: Structural-grade, factory-formed, glass-fiber-resin
channels and angles with 9/16-inch- diameter holes at a maximum of 8 inches o.c., in at least
1 surface.
1. Manufacturers: Subject to compliance with requirements, provide products by one of
the following:
a. Allied Tube & Conduit.
b. Cooper B-Line, Inc.; a division of Cooper Industries.
c. Fabco Plastics Wholesale Limited.
d. Seasafe, Inc.
2. Fittings and Accessories: Products of channel and angle manufacturer and designed
for use with those items.
3. Fitting and Accessory Materials: Same as channels and angles, except metal items
may be stainless steel.
4. Rated Strength: Selected to suit applicable load criteria.
G. Raceway and Cable Supports: As described in NECA 1 and NECA 101.
H. Conduit and Cable Support Devices: Steel hangers, clamps, and associated fittings, designed
for types and sizes of raceway or cable to be supported.
I. Support for Conductors in Vertical Conduit: Factory-fabricated assembly consisting of
threaded body and insulating wedging plug or plugs for non-armored electrical conductors or
cables in riser conduits. Plugs shall have number, size, and shape of conductor gripping
pieces as required to suit individual conductors or cables supported. Body shall be malleable
iron.
J. Structural Steel for Fabricated Supports and Restraints: ASTM A36/A36M, steel plates,
shapes, and bars; black and galvanized.
K. Mounting, Anchoring, and Attachment Components: Items for fastening electrical items or
their supports to building surfaces include the following:
1. Powder-Actuated Fasteners: Threaded-steel stud, for use in hardened portland
cement concrete, steel, or wood, with tension, shear, and pullout capacities
appropriate for supported loads and building materials where used.
a. Manufacturers: Subject to compliance with requirements, provide products by
one of the following:
(1) Hilti Inc.
(2) ITW Ramset/Red Head; a division of Illinois Tool Works, Inc.
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2. Mechanical-Expansion Anchors: Insert-wedge-type, zinc-coated steel, for use in
hardened portland cement concrete with tension, shear, and pullout capacities
appropriate for supported loads and building materials in which used.
a. Manufacturers: Subject to compliance with requirements, provide products by
one of the following:
(1) Cooper B-Line, Inc.; a division of Cooper Industries.
(2) Hilti Inc.
(3) ITW Ramset/Red Head; a division of Illinois Tool Works, Inc.
3. Concrete Inserts: Steel or malleable-iron, slotted support system units similar to MSS
Type 18; complying with MFMA-4 or MSS SP-58.
4. Clamps for Attachment to Steel Structural Elements: MSS SP-58, type suitable for
attached structural element.
5. Through Bolts: Structural type, hex head, and high strength. Comply with
ASTM A 325.
6. Toggle Bolts: All-steel springhead type.
7. Hanger Rods: Threaded steel.
2.03 SOURCE QUALITY CONTROL
A. Provide certified tests on manufacturers standard products for all anchors and other fasteners,
when requested by Architect.
PART 3 - EXECUTION
3.01 EXAMINATION
A. Verify anchors and fasteners are correct for material to be installed in.
1. Follow manufacturer’s recommendations for use.
2. Where anchors are used in a shear application, apply appropriate de-rating factors to
load capacity.
3.02 APPLICATION
A. Comply with NECA 1 and NECA 101 for application of hangers and supports for electrical
equipment and systems except if requirements in this Section are stricter.
B. Maximum Support Spacing and Minimum Hanger Rod Size for Raceway: Space supports for
EMT, IMC, and RMC as scheduled in NECA 1, where its Table 1 lists maximum spacings less
than stated in NFPA 70. Minimum rod size shall be 1/4 inch in diameter.
C. Multiple Raceways or Cables: Install trapeze-type supports fabricated with steel slotted or
other support system, sized so capacity can be increased by at least 25 percent in future
without exceeding specified design load limits.
1. Secure raceways and cables to these supports with two-bolt conduit clamps.
D. Spring-steel clamps designed for supporting single conduits without bolts may be used for 1
inch and smaller raceways serving branch circuits and communication systems above
suspended ceilings and for fastening raceways to trapeze supports.
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3.03 INSTALLATION
A. Raceways, cable assemblies, boxes, cabinets and fittings shall be rigidly supported from the
building structure and securely fastened in place. The supporting means shall provide vertical
support of the weight of the equipment and prevent horizontal movement or sway.
B. Support suspended raceways, cable assemblies, boxes, cabinets and fittings from galvanized
threaded steel rods. Thread rods size shall be a minimum of 1/4 inch diameter.
C. Do not support raceways, cable assemblies, boxes, cabinets and fittings with drop wires, tie
wires, or perforated pipe straps.
D. Do not support raceways, cable assemblies, boxes, cabinets and fittings with aircraft style
hangers, such as Gripple hangers, unless specifically indicated in the Contract Documents.
E. Fasten hanger rods, conduit clamps, and outlet and junction boxes to building structure unless
otherwise indicated. Do not use spring steel clips and clamps.
F. Use toggle bolts or hollow wall fasteners in hollow masonry, plaster, or gypsum board
partitions and walls, expansion anchors or preset inserts in solid masonry walls, self-drilling
anchors or expansion anchor on concrete surfaces, sheet metal screws in sheet metal studs,
and wood screws in wood construction.
G. Do not fasten supports to piping, ductwork, mechanical equipment, or conduit for the support
of other electrical conduits, raceway or equipment.
H. Do not drill structural members without specific permission of the Architect.
I. Install free-standing electrical equipment, such as switchboards, transformers, panelboards
and motor control centers on 4 inch high concrete pads.
J. Install surface-mounted electrical equipment securely with a minimum of four anchors.
Provide full equipment channel supports to stand equipment 3/4 inch from wall for all electrical
equipment installed on masonry and concrete walls.
K. Bridge studs top and bottom with channels to support flush-mounted cabinets and
panelboards in stud walls.
L. Wood Structural Members:
1. Do not suspend loads directly from the bottom of wood structural members unless
approved by the Architect.
2. Transfer suspended loads on open web joists or trusses to the bottom chord at the
panel points. Transfer suspended loads on solid web joists to the joists only through
the top flange or the web.
3.04 SUPPORT INSTALLATION
A. Comply with NECA 1 and NECA 101 for installation requirements except as specified in this
Article.
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B. Strength of Support Assemblies: Where not indicated, select sizes of components so strength
will be adequate to carry present and future static loads within specified loading limits.
Minimum static design load used for strength determination shall be weight of supported
components plus 200 lb.
C. Mounting and Anchorage of Surface-Mounted Equipment and Components: Anchor and
fasten electrical items and their supports to building structural elements by the following
methods unless otherwise indicated by code:
1. To Wood: Fasten with lag screws or through bolts.
2. To New Concrete: Bolt to concrete inserts.
3. To Masonry: Approved toggle-type bolts on hollow masonry units and expansion
anchor fasteners on solid masonry units.
4. To Existing Concrete: Expansion anchor fasteners.
5. To Steel: Beam clamps (MSS Type 19, 21, 23, 25, or 27) complying with MSS SP-69.
6. To Light Steel: Sheet metal screws.
7. Items Mounted on Hollow Walls and Nonstructural Building Surfaces: Mount cabinets,
panelboards, disconnect switches, control enclosures, pull and junction boxes,
transformers, and other devices on slotted-channel racks attached to substrate.
D. Drill holes for expansion anchors in concrete at locations and to depths that avoid reinforcing
bars.
3.05 CONSTRUCTION
A. Fabricate supports from structural steel or steel channel, rigidly welded or bolted to present a
neat appearance. Use hexagon head bolts with spring lock washers under all nuts.
3.06 CONCRETE BASES
A. Construct concrete bases of dimensions indicated but not less than 4 inches larger in both
directions than supported unit, and so anchors will be a minimum of 10 bolt diameters from
edge of the base.
B. Use 3000-psi, 28-day compressive-strength concrete. Concrete materials, reinforcement, and
placement requirements are specified in Division 03 Section "Cast-in-Place Concrete."
C. Anchor equipment to concrete base.
1. Place and secure anchorage devices. Use supported equipment manufacturer's
setting drawings, templates, diagrams, instructions, and directions furnished with items
to be embedded.
2. Install anchor bolts to elevations required for proper attachment to supported
equipment.
3. Install anchor bolts according to anchor-bolt manufacturer's written instructions.
END OF SECTION
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