Seismic Restraint of Electrical Services

1.       All electrical conduit 2 1/2" (64mm) in diameter and larger shall be restrained with specification type 12 seismic cable restraints or specification type 13 for seismic solid brace restraints.

2.       All electrical bus ducts, cable trays and ladder trays shall be restrained with specification type 12, seismic cable restraints or specification 13 seismic solid brace restraints. 

3.       Transverse restraints shall occur at 30' (9m) intervals or both ends if the electrical run is less than the specified interval.  Transverse restraints shall be installed at each electrical services turn and at each end of the electric run. 

4.       Longitudinal restraints shall occur at 60' (9m) intervals with at least one restraint per electric run.  Transverse restraints for one electric section may also act as a longitudinal restraint for a duct for an electric section connected perpendicular to it if the restraints are installed within 4' (1.2m) of the intersection of the electric run and if the restraints are sized for the larger electric run.

5.       All rigid floor mounted equipment must have a resilient media between the equipment mounting hole and the anchor bolt.  Anchor bolts shall be designed in accordance with

6.       section 1.06 seismic forces.  Neoprene bushings shall be specification type 4 and anchor bolts shall be specification type 18 or 19.