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Instructional Leaflet IL019116EN

Effective July 2016
Supersedes December 2015

Installation guidelines for users of Magnum DS 

Low-Voltage Front-Access Switchgear Assemblies 

for seismic applications

A representative Type Magnum DS

®

 Low-Voltage 

Front-Access Switchgear Assembly was attached 

to a seismic table and shaken to simulate the 

effects of an earthquake. The test exceeded the 

requirements of the 2012 International Building 

Code (IBC), the 2013 California Building Code (CBC), 

and OSHPD Seismic Pre-certification (OSP). The 

following guidelines were developed as a result of 

that test program, and they apply to standard and 

arc-resistant switchgear:

1. 

When Magnum DS Front-Access Switchgear 

is subjected to an earthquake, it pulls on its 

foundation. The importance of an adequate 

foundation cannot be over emphasized; in fact, 

proper mounting is the single most important 

factor in withstanding a seismic event. The 

foundation must be level and continuous 

under the entire switchgear assembly. The 

foundation must be designed to withstand 

the reaction loads imposed on it by the 

equipment. The foundation must be designed 

to hold a quantity of two ½-13 SAE Grade 5 

bolts per section or four ½-13 SAE Grade 5 

bolts per section if not mounting switchgear 

to a wall or six ½-13 SAE Grade 5 bolts per 

back-to-back section if mounting switchgear 

back-to-back. The anchoring system must be 

strong enough to prevent “pull-out” of these 

bolts. The wall behind the switchgear must 

be designed to hold a quantity of two ½-13 

SAE Grade 5 bolts per section. The anchoring 

system must be strong enough to prevent 

“pull-out” of these bolts. Both anchoring 

systems, wall, and foundation should be put 

into place prior to switchgear installation 

to reduce effort associated with anchoring. 

Welding to embedded steel members is 

acceptable, provided the weld strength is 

equivalent to that of four SAE Grade 5 bolts 

specified. For nuclear installations, weld per 

AWS D1.1, alternatively, welding procedures 

and personnel qualifications may be performed 

IAW ASME BPVC Section IX and the 

inspections be performed IAW AWS D1.1,  

and/or D1.3 and/or D9.1. See foundation 

drawings provided for the specific project  

to identify anchoring locations.

2. 

Magnum DS Front-Access Switchgear is 

supplied with wall braces that must be used  

to anchor the rear of the switchgear to a wall 

(see 

Figure 4

).

3. 

When Magnum DS is subjected to an 

earthquake, it moves. The amount of motion 

depends on the magnitude of the earthquake. 

Eaton Pow-R-Way

®

 and non-segregated phase 

bus ducts, and their associated switchgear 

flanges have been seismically qualified as 

a system. If other types of top entry, i.e., 

conduits, are necessary, attachments must be 

capable of accommodating a 3-inch front-to-

back and side-to-side (6 inches peak-to-peak) 

cabinet motion.

4.  Center of gravity

  

For seismic calculations, the following 

dimensions should be used to locate  

the approximate center of gravity for  

Magnum DS switchgear. They are applicable  

to all types of line-ups:

Vertical

  

60 inches

From left-to-right

   Center of line-up

From front

  

One-half the depth  

 

of the switchgear

Enclosure weights are found on the equipment 

drawings provided for the specific project. Add 

breaker weights to enclosure weight.

5. 

When a switchgear assembly is separated  

into groups of vertical sections for shipment, 

the user must be sure to install all of the inter-

unit tie bolts (see drawing 9253C18). Failure 

to join the shipping groups together properly 

could result in damage to the equipment 

during an earthquake.

6. 

It is recommended that incoming power  

cables be lashed together at least every  

4 feet within the switchgear.

7. 

The drawout Magnum DS power circuit 

breakers should always remain in the 

connected position or they should be  

secured remote from the switchgear.

8. 

The user should provide storage areas to 

secure mobile pieces of equipment (such as 

breaker lifting trucks, spare breakers, hand 

trucks, etc.) away from the switchgear so it 

is not damaged by being bumped during an 

earthquake. When the optional top-of-gear 

traveling circuit breaker lifter is provided, it 

must be secured in place with the hardware 

provided when not in use. Refer to the 

operating instructions provided with the 

switchgear for the details of this procedure.

Содержание Magnum DS Series

Страница 1: ...W ASME BPVC Section IX and the inspections be performed IAW AWS D1 1 and or D1 3 and or D9 1 See foundation drawings provided for the specific project to identify anchoring locations 2 Magnum DS Front...

Страница 2: ...ure See Figure 3 for front access wall brace weld instructions b Internal bracket on each end of line up to be plug welded to floor steel c For nuclear installations weld per AWS D1 1 alternatively we...

Страница 3: ...gear a 0 19 inches 4 8 mm weld 4 00 inches 101 6 mm long at two places on front of each section starting 0 50 inches 12 7 mm from each edge of structure b Internal bracket on each end of line up to be...

Страница 4: ...inches 101 6 mm long at two places on top of each section starting 0 50 inches 12 7 mm from each edge of structure See Figure 1 for front access front compartment bottom pan weld instructions b For n...

Страница 5: ...B 1 2 inch tie down hardware 1 2 inch tie down hardware 1 2 inch tie down hardware a b Figure 4 Magnum switchgear front access rear frame seismic wall brace and front compartment seismic brace informa...

Страница 6: ...hipped installed on gear Detail B A B 1 2 inch tie down hardware 1 2 inch tie down hardware C 1 2 inch tie down hardware Detail C Rear frame floor brace shipped installed on Switchgear 1 only Switchge...

Страница 7: ...talled on switchgear after the switchgear is secured to wall a c Figure 6 Magnum switchgear front access rear frame seismic wall brace arc resistant specific information a Secure enclosure to pad and...

Страница 8: ...Low Voltage Front Access Switchgear Assemblies for seismic applications Instructional Leaflet IL019116EN Effective July 2016 Detail A A 1 2 inch tie down hardware Rear frame floor brace shipped instal...

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