Eaton Magnum DS Instructional Leaflet

Also see for Magnum DS: Technical data Instruction leaflet Instruction booklet Instructions

Instructional Leaflet IL019117EN Effective July 2016Supersedes December 2015Installation guidelines for users of Magnum DSLow-Voltage Rear-Access Switchgear Assembliesfor seismic applicationsA representative Type Magnum DS® Low-VoltageRear-Access Switchgear Assembly was attachedto a seismic table and shaken to simulate theeffects of an earthquake. The test exceeded therequirements of the 2012 International BuildingCode (IBC), the 2013 California Building Code (CBC),and OSHPD Seismic Pre-certification (OSP). Thefollowing guidelines were developed as a result ofthat test program, and they apply to standard andarc-resistant switchgear:1. When Magnum DS Switchgear is subjectedto an earthquake, it pulls on its foundation.The importance of an adequate foundationcannot be over emphasized; in fact, propermounting is the single most important factor inwithstanding a seismic event. The foundationmust be level and continuous under theentire switchgear assembly. The foundationmust be designed to withstand the reactionloads imposed on it by the equipment. Thefoundation must be designed to hold a quantityof six ½-13 SAE Grade 5 bolts per section.The anchoring system must be strong enoughto prevent “pull-out” of these bolts. Theanchoring system should be put into placeprior to switchgear installation to reduceeffort associated with anchoring. Weldingto embedded steel members is acceptable,provided the weld strength is equivalent tothat of six SAE Grade 5 bolts specified. Fornuclear installations, weld per AWS D1.1,alternatively, welding procedures andpersonnel qualifications may be performedIAW ASME BPVC Section IX and theinspections be performed IAW AWS D1.1,and/or D1.3 and/or D9.1. See foundationdrawings provided for the specific projectto identify anchoring locations.2. When Magnum DS Switchgear is subjected toan earthquake, it moves. The amount of motiondepends on the magnitude of the earthquake.Eaton Pow-R-Way ® and non-segregated phasebus ducts, and their associated switchgearflanges have been seismically qualified asa system. If other types of top entry, i.e.,conduits, are necessary, attachments must becapable of accommodating a 3-inch front-to-back and side-to-side (6 inches peak-to-peak)cabinet motion.3. Center of gravityFor seismic calculations, the followingdimensions should be used to locate theapproximate center of gravity for Magnum DSswitchgear. They are applicable to all typesof line-ups:Vertical 60 inchesFrom left-to-right Center of line-upFrom front One-half the depthof the switchgearEnclosure weights are found on the equipmentdrawings provided for the specific project. Addbreaker weights to enclosure weight.4. When a switchgear assembly is separatedinto groups of vertical sections for shipment,the user must be sure to install all of the inter-unit tie bolts (see drawing 9253C18). Failureto join the shipping groups together properlycould result in damage to the equipmentduring an earthquake.5. It is recommended that incoming powercables be lashed together at least every4 feet within the switchgear.6. The drawout Magnum DS power circuitbreakers should always remain in theconnected position, or they should besecured remote from the switchgear.7. The user should provide storage areas tosecure mobile pieces of equipment (such asbreaker lifting trucks, spare breakers, handtrucks, etc.) away from the switchgear so itis not damaged by being bumped during anearthquake. When the optional top-of-geartraveling circuit breaker lifter is provided, itmust be secured in place with the hardwareprovided when not in use. Refer to theoperating instructions provided with theswitchgear for the details of this procedure.

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