Rounded Corners

Restraining Electrical Equipment

Restraints are used to prevent equipment and systems from moving horizontally, vertically, or from turning over. The purpose of restraining is to prevent equipment from damaging itself (rendering it non-functional) or damaging adjacent systems that need to remain operational during an Extreme Event. The restraint or anchoring systems must provide a direct load path to the main structure of the building. In all cases, the use of gravity and friction are not acceptable forms of restraint.

Typical equipment will include transformers, switch gears, motor control centers, bus ducts, cable trays and electrical panels. 



The Vibro-Acoustics series of BC seismic beam clamps provide high strength attachments to steel structures without drilled holes or welded brackets for seismic restraint kits such as BulletBrace™ or RRK rigid restraint kit series.


Vibro-Acoustics’ BulletBrace preassembled adjustable cable restraint kits are used to restrain non-structural components against seismic, wind, or blast forces. BulletBrace kits are completely preassembled, a unique feature in today’s market, making them the fastest restraints to install.

SRK Cable Restraints

Cable restraints used for suspended and rooftop systems and equipment. Suitable for heavy load applications. Two sizes available at 1400 lbs and 2880 lbs maximum tension rating.


Seismic Spring Isolators

Our restrained spring type isolators with housings are designed to prevent excessive equipment movement due to seismic and wind forces.

Seismic Restraint Brackets

Our standardized seismic equipment restraint brackets save installation time and effort and match a variety of equipment base styles.


Type NP neoprene rubber pads can be cut to specific sizes to match loading conditions. Type RD neoprene mounts include a threaded insert for attachment. Both options provide effective high frequency isolation on stiff structures.


Grommet Washers

High durometer neoprene grommet washers help minimize shock loading anchor bolts.

Rigid Restraints

Rigid restraints used for suspended and rooftop systems and equipment

ComponentDesign Considerations 

Indoor base mounted
equipment (transformers,
motor control centers,
transfer switches, etc.)

Anchor equipment to housekeeping pads, keeping in mind anchor edge distance and anchor embedment depthindoor base
Ensure that housekeeping pads have been reinforced and positively attached to the building structure for the designed equipment’s seismic and overturning loads
Verify that housekeeping pads have adequate depth for anchor embedment
Establish that restraint brackets are adequately attached to the equipment
Vibration control products shall be seismically rated and should not affect the restraint system
Cable trays and
bus ducts
The restraint system needs to be attached to the building structurecable trays and bus ducts
Confirm that restraint anchor location (wall, beam, column or slab) can withstand seismic load
Anchors need to be seismically approved