Specifications

Draper Prison Wasatch & Oquirrh Intercom & Paging System Remodel 4-21-2014
ELECTRICAL SUPPORTS AND SEISMIC RESTRAINTS 260072 – 5
C. Install seismic-restraint components using methods approved by the evaluation service
providing required submittals for component.
D. Strength of Support and Seismic-Restraint Assemblies: Where not indicated, select sizes of
components so strength will be adequate to carry present and future static and seismic loads
within specified loading limits. Minimum static design load used for strength determination shall
be weight of supported components plus 200 lb (90 kg).
E. 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. Instead of expansion anchors, powder-actuated driven threaded studs provided with lock
washers and nuts may be used in existing standard-weight concrete 4 inches (100 mm)
thick or greater. Do not use for anchorage to lightweight-aggregate concrete or for slabs
less than 4 inches (100 mm) thick.
6. To Steel: Beam clamps (MSS Type 19, 21, 23, 25, or 27) complying with MSS SP-69
Spring-tension clamps.
7. To Light Steel: Sheet metal screws.
8. 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 by means
that meet seismic-restraint strength and anchorage requirements.
F. Drill holes for expansion anchors in concrete at locations and to depths that avoid reinforcing
bars.
G. Do not drill or core cut holes for anchors or use powder-activated fasteners in post-tension
slabs, joists, and beams.
3.3 INSTALLATION OF FABRICATED METAL SUPPORTS:
A. Comply with installation requirements in Division 5 Section "Metal Fabrications" for site-
fabricated metal supports.
B. Cut, fit, and place miscellaneous metal supports accurately in location, alignment, and elevation
to support and anchor electrical materials and equipment.
C. Field Welding: Comply with AWS D1.1/D1.1M.
3.4 INSTALLATION OF SEISMIC-RESTRAINT COMPONENTS:
A. Install bushing assemblies for anchor bolts for floor-mounted equipment, arranged to provide
resilient media between anchor bolt and mounting hole in concrete base.
B. Install bushing assemblies for mounting bolts for wall-mounted equipment, arranged to provide
resilient media where equipment or equipment-mounting channels are attached to wall.
C. Restraint Cables: Provide slack within maximums recommended by manufacturer.
Bid DA14027DFCM
5/30/2014 2:08 PM p. 70