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Effective October 2013

Supersedes April 2012Technical Data TD01508002E

Switchboard seismic

application guidelinesEquipment representing the products listed belowwere subjected to seismic testing in accordancewith the 2012 International Building Code (IBC)and the 2013 California Building Code (CBC). Theresults of these tests exceeded the requirementsas stated within the IBC and CBC and demon-strated the ability to function after the test. Allinstallation guidelines covered in this documentas well as the instruction and operations literatureprovided with the equipment must be followedto ensure installation suitable for a seismicapplication.

Certificates for various types of distributionand control equipment along with an applicationpaper, Earthquake Requirements and SeismicCapabilities for Eatons Electrical Distributionand Control Equipmentcan be found atwww.eaton.com/seismic.

Foundation plan andmounting requirements

Proper mounting of the equipment is the singlemost important factor in withstanding a seismicevent. The foundation must be level and continuous under the assembly. The foundation must bdesigned to withstand the reaction loads imposon it by the equipment during a seismic event.The mounting bolts, quantity and torque valuescontained in Table 1represent the mountingcharacteristics for the specimens tested. Theanchoring system should be put in place prior to

equipment installation to reduce effort associatewith anchoring. Floor plan drawings provided forthe specific project should be utilized to identifyanchoring locations. The foundation drawingsnoted below are generic in nature and do notreflect the actual configuration of vertical sectiofor a specific project.

Table 1. Equipment hardware and floor plan information (as tested)

Type Enclosure typeHardwarelocation

Bolt typeand size

Washer typeand size Torque Bolt quantity

Foundationfloor plan

Freestanding NEMA1 Internalto enclosure

SAE grade5, -13

1.375" ODwasher

60 lb f t 4 per verticalsection

1A32496

NEMA 3R (flat roof) Internalto enclosure

SAE grade5, -13

1.375" ODwasher

60 lb f t 6 per verticalsection

1A32497

NEMA 3R (slopedrooffront access)

Internalto enclosure

SAE grade5, -13

1.375" ODwasher

60 lb f t 6 per verticalsection

1A32498

NEMA 3R (slopedroofrear access)

Internalto enclosure

SAE grade5, -13

1.375" ODwasher

60 lb f t 6 per verticalsection

1A32499

Wall-secured NEMA 1 Internalto enclosure

SAE grade5, -13

1.375" ODwasher

60 lb f t 4 per verticalsection

1A32496

External wallbrackets

SAE grade5, 3/8-16

1.00" ODwasher

25 lb ft Refer to 42C5546 for quantityand placement of hardware

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Eaton

1000 Eaton BoulevardCleveland, OH 44122United StatesEaton.com

2013 EatonAll Rights ReservedPrinted in USAPublication No. TD01508002E / BC-182October 2013

Eaton is a registered trademark.

All other trademarks are propertyof their respective owners.

Technical Data TD01508002E

Effective October 2013

Switchboard seismic application guidelines

Displacement

The horizontal displacement of the top of the equipment is listedin Table 2. The horizontal displacements given in the table are plus/minus values. The equipment must be at the minimum distancelisted in the following table to avoid contact with other stationaryobjects during a seismic event. These displacement values correlateto the highest ground level acceleration value that the equipment

has been tested to. Refer to the appropriate seismic certificateto determine seismic withstand level.

Table 2. Equipment displacement

Type Front to back Side to side

Freestanding 4.00 inches 3.25 inches

Wall-secured NA NA

Consideration must be given to attachments (conduits, bus duct,etc.) made to the top of the equipment. Attachments must haveprovisions to accommodate the displacement of the equipmentindicated above. Entry from the bottom of the equipment eliminatesthe need for accommodating this motion for attachments.

Center of gravity

For seismic calculations, the following dimensions should be usedto locate the center of gravity for the equipment. These dimensionsare applicable for all structures.

Table 3. Equipment center of gravity

Direction Dimension

Vertical 60 inches from base

Left to right Centerline of the structure/lineup

Front to back Two-fifths the depth of the structure/lineup

Loose equipment and removable devices

Removable devices should always remain in the Connectedposition or be stored remote from the equipment. The user shouldprovide storage means to secure mobile pieces of equipmentto avoid damage during a seismic event. Refer to the instructionand operation manual provided with the equipment for details.

Attachment of shipping sectionsIf equipment is provided in separate groups of vertical sectionsfor purposes of shipping or handling, the installer must installall of the shipping section tie bolts. (See instruction and operationsmanual provided with equipment.) Failure to properly join shippinggroups could result in damage to the equipment during a seismicevent.

Doors

All doors should be secured with attachment means provided.