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White Paper - Earthquake environments - 13 Pages

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White Paper - Earthquake environments

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Earthquake Environments Whitepaper

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Introduction Every day, hundreds of small to medium earthquakes rattle homes, buildings and other high-value structures globally. Casualties and structural damage from a given quake depend on many variables, including but not limited to: ■ building codes; ■ code enforcement rigor; ■ structure age; ■ construction materials; ■ foundation design and reinforcement; ■ soil properties; ■ intensity (magnitude); ■ depth; ■fault / thrust type; ■distance from epicentre. Evidence from small and large quakes globally points to strict building codes, enforcement, and preparedness as key factors in...

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Scope In the event of an earthquake, the type of electrical cabinet used to house equipment and components is often the deciding factor in whether or not the equipment will remain active, and selecting the proper electrical cabinet could mean the difference between failure and continued functionality. Most manufacturers of electrical cabinets offer products that are marketed as offering earthquake-resistant cabinets; however, there can be significant differences in the standards used to achieve those certifications, and thus, major disparities in the level of protection that those products...

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Standards There are a number of standards and regulations relating to earthquake protection. As already stated, building safety is often the primary concern. In certain regards, the standards adopt very different approaches according to the scientific discipline – civil engineering, electrical engineering or information technology. According to seismic codes, earthquake-resistant enclosures are intended to withstand the largest earthquake of a certain probability that is likely to occur at their location. This means the collapse of the structure should be minimized for rare earthquakes...

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Test Selection Nowadays, there are many possibilities and standards available to certify enclosures as earthquake resistant. Eldon, aiming to fulfil all customer requirements, has tested its combinable floor standing range, in particular MCS, to certify it according to: Telcordia GR-63-CORE Within Telcordia GR-63-CORE, the document refers to different zones in the United States, from zone 0 up to 4, representing zone 0, a very low risk, and zone 4, a high risk of earthquakes. Comparing with other standards, such as DIN EN/IEC 60068-3-3, Telcordia GR-63-CORE requirements are higher, which is...

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Table 1. Upper Floor Acceleration (g). Telcordia GR-63-CORE Table 2. Upper Floor Acceleration. Other standards. Eldon White Paper - EARTHQUAKE ENVIRONMENTS | 7

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IEEE 344 The nuclear power industry in North America (USA, Canada & Mexico) requires seismic qualification testing for any equipment being installed in nuclear power generating stations. If it has a safety related function (Seismic Category I) then it must be qualified for its capability to perform satisfactorily in the event of an earthquake either by analysis or by testing. In the case of vibration testing, the requirements are defined within IEEE-Std-344. The IEEE-344 standard makes numerous references to two categories of earthquake: OBE or Operating Basis Earthquake; SSE or Safe...

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Test Method Eldon, continuously gathering customer feedback, has been focused on certifying its combinable floor standing enclosure as seismic zone 3 (according to Point 5.4.1, Earthquake Test Methods, of TELCORDIA TECHNOLOGIES GENERIC REQUIREMENTS, “GR-63-CORE”, Issue 4, March 2012), without using any seismic accessory, to fulfil the market requirements. Thus, Eldon has carried out two different seismic tests in an independent laboratory. Both tests were carried out on a vibration test platform provided with a “bi-axial independent” action, EDB 250 x 250, of 2,500 mm width by 2,500 mm...

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Equipment tested: MCS20086R5 ■ Cabinet Drawing number: MCS20086R5/MCS20086PER5, revision 1; ■ IP 56 Type 4, 12, 13 IK 10; ■ Dimensions: 800 (width) x 600 (depth) x 2000 (height) mm; ■ Mounting plate height: 1894 mm; ■Width mounting plate: 694 mm; ■Maximum cabinet useful depth: 559 mm; ■ Weight: 132 kg. Accessories: ■ PS1060 + PF1080 (Plinth); • Plinth Drawing number: PS1060 and PF1080, revision 1; • Dimensions: 800 (width) x 600 (depth) x 100 (height) mm; • Weight: 6 kg. Figure 4. MCS20086R5 - Loaded mounting plate To simulate a real application, the mounting plate was loaded with 155 kg,...

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Test procedure for combinable enclosure with swing frame, according to telcordia GR-63-CORE, Seismic Zone 3. Equipment tested: MCS20086R5 ■ Cabinet Drawing number: MCS20086R5/MCS20086PER5, revision 1; ■ IP 56 Type 4, 12, 13 IK 10; ■ Dimensions: 800 (width) x 600 (depth) x 2000 (height) mm; ■ Mounting plate height: 1894 mm; ■Width mounting plate: 694 mm; ■Maximum cabinet useful depth: 559 mm; ■ Weight: 132 kg. Accessories: ■ESFC406 (Swing Frame) • Swing Frame Drawing number: ESFC406, revision 1; •Dimensions: 500 (width) x 2000 (height) mm; • Weight: 17 kg. ■ PS1060 + PF1080 (Plinth) • Plinth...

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Test procedure for combinable enclosure with seismic accessory (SBK) according to IEEE 344. Equipment tested: MCS20088R5 ■ Cabinet Drawing number: MCS20088R5/MCS20088PER5, revision 1; ■ IP 56 Type 4, 12, 13 IK 10; ■ Dimensions: 800 (width) x 800 (depth) x 2000 (height) mm; ■ Mounting plate height: 1894 mm; ■Width mounting plate: 694 mm; ■ Maximum cabinet useful depth: 759 mm; ■ Weight: 139 kg; Accessories: ■SBK20088 (Seismic bracket kit) • Seismic Bracket Drawing number: SBK20088, revision 1; •Dimensions: 800 (width) x 800 (depth) x 2000 (height) mm; •Weight: 13 kg. ■ 2 x CLPK800 (Click in...

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Results Combinable enclosures tested have successfully passed the Seismic Tests, to which they have been subjected, maintaining their structural integrity, without any anomaly or structural deterioration having been detected. In summary, three tests have been succeeded: Applicability of the tests Although tests were carried through with combinable enclosures with dimensions 2000 mm (h) x 800 mm (w) x 600 mm (d) and 2000 mm (h) x 800 mm (w) x 800 mm (d), and the enclosure's certification is only valid for the sizes and configuration tested, Eldon states that other combinable enclosure...

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