Telcordia GR-63 Seismic

Telcordia GR-63 seismic qualified enclosures are designed to meet or exceed the Telcordia NEBS Zone 4 testing objectives and requirements. GR-63 describes the protection level of an enclosure. It requires an enclosure to provide a level of protection such that the equipment inside shall sustain operation without replacement of components, manual rebooting, (or) human intervention during an earthquake

To achieve GR-63 compliance, enclosure manufacturers turn to independent, third-party testing facilities. An enclosure is loaded to capacity and mounted on a shaker table. The shaker table then simulates an earthquake, shaking in every potential direction at varying levels of intensity up to the equivalent of an 8.3 earthquake. Accelerometers are attached to the enclosure to measure its vibration and sway during the test.

To pass the test and achieve the seismic rating, the enclosure must not sway more than three inches in any direction and all components must remain operable during and after the test. This test is the same for every enclosure manufacturer, regardless of where that enclosure is going to be used or its intended purpose. 

Need a Custom Seismic Rated Cabinet?

We offer design services and solutions to meet the needs of any product specification. You can count on our expert resources and engineering capabilities to support any stage of your project, from concept to production. Contact us with your requirement today.

Did you Know?

Earthquakes are not limited to the state of California, nor are they infrequent. Seismic events take place every day throughout much of the continental United States. There are two standards by which enclosures are deemed seismic. Telcordia GR-63 and International Building Code (IBC). Learn more about the differences here.


When comparing cabinets for seismic installations, ask what the DYNAMIC (seismic) load rating is. Most seismic cabinets will have a higher STATIC (non-seismic) load rating, but the dynamic rating is the only one that matters. 


  • Fully welded frame structure
  • Nine heights, four depths
  • Multi-formed vertical corner posts
  • Heavy duty door with multi-point latching system
  • Robust door hinges
  • Locking hardware
  • Floor tie-down brackets


  • Thru-Hole mounting rails – Adjustable front to rear
  • 10-32 tapped mounting rails optional


  • Color: Select from one of nine proprietary color options. Sample kits are available upon request.
  • Our products are finished in textured powder paint. Powder coating provides a durable high-quality finish

Load Rating

  • Static load rating: 3,500 lbs.
  • 630 lb. dynamic load rating with center of gravity at approximately 30”
  • A cabinet has a static load when:
    • It is in its final, permanent, fully secured location, and
    • Its load is uniformly applied to the two sets of rack-mounting rails
  • Never move a cabinet with its maximum static load applied

Industry Standard

  • EIA 310-D

Options and Accessories

The following options and accessories are available.

Loading Tips

Installation of the cabinet or rack

  • The cabinet or rack cannot be anchored to the ground if casters or leveling feet are on the frame.
  • To achieve maximum protection, the cabinet or rack needs to be properly and firmly anchored to the floor of the building.
  • Consult a structural/building engineer if you need help installing the concrete anchors.

How the equipment is distributed in the cabinet or rack

  • Keep the center-of-gravity low by placing heavier components towards the bottom of the enclosure.
  • Ganging cabinets or racks will produce a more stable installation than a single cabinet or rack.

Sizes Available

This is configure-to-order product allowing users to select from a variety of standard components to build exactly what is required for their specific application. Internal and external accessories such as shelves, power, airflow, and cable management are available to complete the design. The entire product will ship as configured so there is no assembly required. The following frame sizes are available.