SUPPORTING DEVICES

SUPPORTING DEVICES
PART 1 - GENERAL
1.01 RELATED DOCUMENTS
A. Drawings and general provisions of Contract, including General and
Supplementary Conditions and Division 1 Specification Sections, apply to
this sections.
B. Requirements of the following Division 16 Sections apply to this section:
1. “ Basic Electrical Materials and Methods.”
1.02 SUMMARY
A. This Section includes secure support from the building structure for
electrical items by means of hangers, supports, anchors, sleeves, inserts,
seals, and associated fastenings.
B. Related Sections: the following Sections contain requirements that relate
to this section:
1. Division 3 Section “Concrete Accessories” for inserts, anchors, and
sleeves to be installed in concrete for use with supporting devices.
2. Division 5 Section "Metal Fabrications” for requirements for
miscellaneous metal items involved in supports and fastenings.
3. Division 7 Section “Joint Sealers” for requirements for fire stopping at
sleeves through walls and floors that are fire barriers.
4. Refer to other Division 16 sections for additional specific support
requirements, through wall sleeves for conduit and cable, straps,
saddles and bearing com
ponents that are applicable.
1.03 SUBMITTALS
A. General: submit the following in accordance with conditions of contact
and Division 1 Specification Sections.
B. Product data for each type of product specified
1. Hanger and support schedule showing manufacturer’s figure number,
size, spacing, features, ad application for each required type of
hanger, support, sleeve, seal, and fastener to be used.
C. Engineered design consisting of details and engineering analysis for
custom built supports.
D. Shop drawings indicating details of fabricated product and materials.
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1.04 QUALITY ASSURANCE:
A. Manufacturers: firms regularly engaged in manufacture of supports of
various kinds and capacities required, whose products have been in
satisfactory use in similar service for not less than 3 years.
B. Support Component Standards: components and installation shall comply
with applicable local codes and standard details approved for the project.
C. Support components shall be listed and labeled by BS, DIN or other
approved, nationally recognized testing and listing agency that provides
third-party certification follow-up services
PART 2 - PRODUCTS
2.01 COATINGS:
A. Coating: steel supports, support hardware, and fasteners shall be protected
with zinc coating or with treatment of equivalent corrosion resistance using
approved alternative treatment, finish, or inherent material characteristic
products for use outdoors shall be hot-dip galvanized.
2.02 MANUFACTURED SUPPORTING DEVICES:
A. Raceway Supports: clevis hangers, riser clamps, conduit straps, threaded CClamps
with retainers, ceiling trapeze hangers, wall brackets, and spring
steel clamps.
B. Stirrup Clamps: hot-dip galvanized steel, with metal or plastic spacer,
clamping pads and hexagonal screw to suit the application, fixable to
channel rails, flats and angle iron. Hex screw to be with two-start thread and
head qualifying for wrench or screw driver application.
1. U-channel of hot-dip galvanized steel, is to be appropriately sized for
stirrups and loading capacity.
C. Fasteners: types, materials, and construction features as follows:
1. Expansion Anchors: carbon steel wedge or sleeve type.
2. Toggle Bolts: all steel, springhead type.
3. Powder –Driven Threaded Studs: heat-treated steel, designed
specifically for the intended service.
4. Fiber-plastic or lead inserts with applicable screw sizes of galvanized
steel for fixing single run conduit clamps, clips and saddles.
D. Conduit Sealing Bushings: factory-fabricated watertight conduit sealing
bushing assemblies suitable for sealing around conduit, or tubing passing
through concrete floors and walls. Construct seals with steel sleeve,
malleable iron body, neoprene sealing grommets or rings, metal pressure
rings, pressure clamps, and cap screws.
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E. Cable Supports in Vertical Conduit: factory-fabricated assembly consisting
of threaded body and insulating wedging plug for nonarmored electrical
cables in riser conduits. Provide plugs with number and size of conductor
gripping holes as required to suit individual risers. Construct body of
malleable-iron casting with hot-dip galvanized finish.
F. U-Channel Rail Systems: minimum 2mm (16-gage US) galvanized steel
channels, with 14mm (9/16-inch)- diameter holes, at a minimum of 8 inches
(200 mm) on center, in top surface. Provide fittings and accessories that
mate and match with U-channel rail and are of the same manufacture.
Provide modular clamps and slide-in spacers of impact and fire resistant
polystyrene or metal spacers to suit the requirements.
2.03 FABRICATED SUPPORTING DEVICES:
A. General: shop or field-fabricated supports or manufactured supports
assembled from U-channel components.
B. Steel Brackets: fabricated of angles, channels, and other standard structural
shapes. Connect with welds and machine bolts to form rigid supports.
C. Pipe Sleeves: provide pipe sleeves of one of the following:
1. Steel Pipe: fabricate from Schedule heavy gauge galvanized steel pipe.
2. Plastic Pipe: fabricate from Schedule extra heavy gauge PVC plastic
pipe.
3. Refer to Section “ Raceways” for other type of sleeves.
PART 3 - EXECUTION
3.01 INSTALLATION:
A. Install supporting devices to fasten electrical components securely and
permanently in accordance with regulation.
B. Coordinate with the building structural system and with other electrical
installation.
C. Raceway Supports: comply with the applicable approved local or other
international code, and the following requirements:
1. Conform to manufacturer’s recommendations for selection and
installation of supports.
2. Strength of each support shall be adequate to carry present and future
load multiplied by a safety factor of at least four. Where this
determination results in a safely allowance of less than 90 kg (200 Ibs)
provide additional strength until there is a minimum of 90kg (200 lbs)
safety allowance in the strength of each support.
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Install individual and multiple (trapeze) raceway hangers and riser clamps
as necessary to support raceways. Provide U-bolts, clamps, attachments and
other hardware necessary for hanger assembly and for securing hanger rods
and conduits.
3. Support parallel runs of horizontal raceways together on trapeze-type
hangers.
4. Support individual horizontal raceways by separate pipe hangers.
Spring steel fasteners may be used in lieu of hangers only for 38mm (1-
1/2-inch) and smaller raceways serving lighting and receptacle branch
circuits above suspended ceilings only. For hanger rods with spring
;steel fasteners, use 6mm (1/4-inch) diameter or larger threaded steel.
Use spring steel fasteners that are specifically designed for supporting
single conduits or tubing.
5. Space Supports for raceways in accordance with Table (1) of this
section. Space supports for raceway types not covered by the above in
accordance with local Codes and Regulations.
6. Support Exposed and concealed raceway within 300 mm (1 foot) of an
unsupported box and access fittings. In horizontal runs, support at the
box and access fittings may be omitted where box or access fittings are
independently supported and raceway terminals are not made with
chase nipples or thread less box connectors.
7. In vertical runs, arrange support so the load produced by the weight of
the raceway and the enclosed conductors is carried entirely by the
conduit supports and not by raceway terminals.
D. Vertical Conductor Supports: install simultaneously with installation of
conductors.
E. Miscellaneous Supports: support miscellaneous electrical components as
required to produce the same structural safety factors as specified for
raceway supports. Install metal channel racks for mounting cabinets, panel
boards, disconnects, control enclosures, pull boxes, junction boxes,
transformers, and other devices.
F. In open overhead spaces, cast boxes threaded to raceways need not be
supported separately except where used for fixture support, support sheet
metal boxes directly from the building structure or by bar hangers. Where
bar hangers are used, attach the bar to raceways on opposite sides of the box
and support the raceway with an approved type of fastener not more than 24
inches (600mm) from the box.
G. Sleeves: install in concrete slabs and walls and all other fire-rated floors and
walls for raceways and cable installations. For sleeves through fire ratedwall
or floor construction, apply fire stopping sealant in gaps between
sleeves and enclosed conduits and cables in accordance with “Fire Resistant
Joint Sealers” requirement of Division 7 Section “Joint Sealers”
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H. Conduit Seals: install seals for conduit penetrations of slabs on grade and
exterior walls and where indicated. Tighten sleeve seal screws until sealing
grommets have expanded to from watertight seal.
I. Fastening: unless otherwise indicated, fasten electrical items and their
supporting hardware securely to the building structure, including but not
limited to conduits, raceways, cables, cable trays, busways, cabinets, panel
boards, transformers, boxes, disconnect switches, and control components
in accordance with the following:
1. Fasten by means of wood screws or screw-type nails on wood, toggle
bolts on hollow masonry units, concrete inserts or expansion bolts on
concrete or solid masonry, and machine screws, welded threaded
studs, or spring tension clamps on steel. Threaded studs driven by a
powder charge and provided with lock washers and nuts may be used
instead of expansion bolts and machine or wood screws. Do not weld
conduit, pipe straps, or items other than threaded studs, to steel
structures. In partitions of light steel construction, use sheet metal
screws.
2. Holes cut to depth of more than 1-1/2 inches (40 mm) in reinforced
concrete beams or to depth of more than 3/4inch (20 mm) in concrete
slabs shall not cut the main reinforcing bars. Fill holes that are not
used. Coordinate with Engineer before cutting holes.
3. Ensure that the load applied to any fastener does not exceed 25
percent of the proof test load. Use vibration-and shock-resistant
fasteners for attachments to concrete slabs.
3.02 TESTS:
A. Test pull-out resistance of one of each type, size, and anchorage material for
the following fastener types:
1. Expansion anchors.
2. Toggle bolts.
3. Powder-driven threaded studs.
B. Provide all jacks, jigs, fixtures, and calibrated indicating scales required for
reliable testing. Obtain the structural Engineer’s approval before
transmitting loads to the structure. Test to 90 percent or rated proof test load
for fastener. If fastening fails test, revise all similar fastener installations
and retest until satisfactory results are achieved.
3.03 TABLE 1- SPACING FOR RACEWAY SUPPORTS
A. Supports: us approved clamps, hangers or clips fastened by machine screws
to expansion sleeves in inserts or to lead anchors.
B. Spacing of clamps or clips for supporting steel conduits is not to be greater
than:
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Conduit Size Maximum Spacing of Supports
mm (inches) meters (feet)
20(3/4) 1.5 (5)
25 (1) 1.5 (5)
32-38 (1-1/4 –1-1/2) 2 (6.5)
50-63 (2-2-1/2) 2 (6.5)
75 (3) and larger 2.5 (8)
C. Spacing of clamps or clips for supporting PVC conduits is not to be greater
than:
Conduit Size Maximum Spacing of Supports
mm (inches) meters (feet)
Conductors Rated Conductors Rated
60 deg. C and below more than 60 deg.C
20(3/4) 1.25(4) 0.60(2)
25-50(1-2) 1.50(5) 0.75(2-1/2)
63-75(2-1/2-3) 1.80(7) 0.90(3)
90-125(3-1/2-5) 2.00(7) 1.00(3-1/2)
150(6) 2.50(8) 1.25(4).
END OF SECTION 16190