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This appendix provides the design criteria for seismic Category I cable trays and their supports. Seismic Category II cable trays and their supports are also designed utilizing the design criteria of this appendix.
Not all cable trays require seismic bracing. Smaller trays (e.g., 200mm) that contain only a few control or lightweight cables will typically have a total weight below 150N/m.
Seismic bracing shall not limit the expansion and contraction of systems; the engineer of record shall ascertain that consideration is given to the individual dynamic and thermal properties of
This course was adapted from the Federal Emergency Management Agency, Publication No. FEMA 413, “Installing Seismic Restraints for Electrical Equipment”, which is in the public domain.
Why is seismic bracing important? Studies have shown that earthquake damage to mechanical, electrical and plumbing (MEP) systems account for more than half of monetary damage to buildings
Kit contains items needed for seismic bracing long cable tray runs. Each kit contains: (4) 11'' cables with mounting eyelets (2) Metal brackets for attachment to support members (4) Cable clamp collars (4)
Eaton''s B-Line series cable tray with TOLCO seismic bracing is the recommended total solution for your project. Our cable tray, bolted framing, and seismic bracing are approved as one system through
Determine the required seismic design "g" values-for the cable tray hanger by multiplying 1.25 to the above "g" value (obtained in Step iv) to account for multimode response except as noted in-
Figure 1. Technical overview of seismic cable tray design considerations including bracing splice reinforcement movement accommodation cable retention and support verification. High
When cable trays have vertical drops of more than about 20 feet and flapping of the cables during an earthquake might cause pinching or cutting of the cables or impact with proximate fragile equipment,
Cable bracing works in tension, so it requires two opposing brace assemblies at each brace location. Rigid bracing works in both tension and compression, so one brace assembly per brace location is
The seismic performance of a cable tray system depends just as much on the building connection as on the tray itself. Every hanger, trapeze, beam clamp, concrete insert, and post
The cable trays have diagonal bracing between layers of cable trays in the longitudinal direction using proprietary steel members and connected using bolts and clamps.
1.1 Introduction Gripple Seismic Bracing Systems are specifically designed and engineered to brace and secure suspended nonstructural equipment (VAV boxes, fans, unit heaters, small in-line pumps, etc.)
A number of shake table tests on portions of cable tray and conduit systems confirm these observations from past earthquakes and demonstrate that typical configurations perform well under repeated high-
SEISMIC FORCES ACTING ON ELECTRICAL DISTRIBUTION SYSTEMS When subjected to an earthquake, electrical distribution systems must resist lateral and axial buckling forces, and the
The seismic performance levels of cable tray systems are presented according to current seismic design codes. A performance-based optimum seismic design procedure for cable tray
The design aspects of electrical cable trays and support systems are discussed from the seismic and structural standpoint. The effects of the inherent flexibility of commonly used cable trays
Strap cables, either individually or in bundles, to the cable tray at a spacing equal to one half the support spacing to spread the seismic loads evenly to all restraint points.
Seismic bracing shall not limit the expansion and contraction of systems; the engineer of record shall ascertain that consideration is given to the individual dynamic and thermal properties of these
All linear runs must have minimum two transverse seismic restraints and one longitudinal seismic restraint. A run is defined as a 1.5m length for duct and 3m length for any other linear non-structural
Seismic bracing has been tested and can withstand a floor acceleration load of 1.8 g during simulated earthquakes of magnitude 7, 8, and 9, demonstrating excellent