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Eaton?s solution to arc flash

Eaton?s solution to arc flash
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Arc-resistant low voltage switchgear Eaton’s solution to arc flash For years, electrical equipment has been designed to withstand and deal with the issue of bolted faults, where the current spikes to a dangerously high level but is safely interrupted by the protective devices contained in the equipment (breakers, fuses and relays). However, these devices typically do not detect and interrupt dangerous internal arcing faults, which have a lower current level, but can generate a far more dangerous scenario for operating personnel. Arc faults can be caused by a breakdown of insulation materials, objects coming into close proximity with the energized bus assembly, and even entry of rodents or other animals into the equipment. The thermal energy created by these events can get as high as 35,000°F, melting materials and clothing from several feet away. Also consider that the arc blast produced by a lineup of 480 Vac switchgear rated at 85 kA can be equivalent to 20.7 lbs of TNT. What is the solution? Eaton’s solution: arc-resistant low voltage switchgear Standard features • The arc-resistant low voltage switchgear protects operating and maintenance personnel from dangerous arcing faults by redirecting or channeling the arc energy out of the top of the switchgear, regardless of the origination location of the arc. Eaton’s arc-resistant low voltage switchgear has been successfully tested to ANSI C37 .20.7 at KEMA-Powertest, and has been ULா witnessed and certified. Up to 100 kA short-circuit at 508 Vac maximum and up to 85 kA short-circuit at 635 Vac maximum Up to 5 kA vertical bus continuous current Dynamic flap system on rear ventilation openings that remain open under normal operating conditions, but close during an arcing event to prevent dangerous gasses from escaping Up to 10 kA horizontal main bus continuous current Strengthened one-piece breaker door and latches Eaton introduces the addition of an ANSI Type 2 arc-resistant low voltage switchgear offering to its current product line. This is the latest release in arc-safe equipment from Eaton’s Electrical Sector. Magnum DSா power circuit breaker frame ratings between 800A and 6000A ANSI Type 2 arc-resistant design protects the operator around the entire perimeter of the equipment Floor-to-ceiling height of 10 feet required whether exhausting into a room or through an arc plenum Optional features • Zone selective interlocking protection ANSI Type 2B arc-resistant design protects the operator even with the low voltage instrument compartment door open Unique bellows design, allowing drawout of breaker into the disconnected position with the door closed, while simultaneously protecting the operator from any dangerous gasses during an arc event Arcflash Reduction Maintenance Systemீ Safety shutters One-piece hinged and bolted rear panel Venting system that directs arc gasses out of the top of the enclosure, regardless of the arc origination location Vented bus/cable compartment barrier Cable compartment segregation barrier Up to four-high breaker configuration with no additional layout restrictions Strengthened side and rear panels with standard split rear covers for cable access Superior protection against arcs in breaker, bus or cable compartments NEMAா 1 enclosure, with either top or bottom cable or bus duct entry No increase in footprint over regular Magnum DS switchgear Cable compartment floor plates Closed door racking

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Third-party (UL/CSA) witness tested Seismic certification IBC 2009, CBC 2010, OSHPD Strengthened One-Piece Breaker Door Bellows and Two-Point Door Latch Rear Top Vent w/Dynamic Flap Rear Bottom Vent w/Dynamic Flap Hinged Bolted Rear Panel Cable Compartment Floor Plates Testing Testing procedures were completed per ANSI C37 .20.7 standards with arcs initiated in: • Breaker compartment Cable termination compartments Additionally, the tested arc duration was 0.5 seconds recommended by ANSI C37 .20.7 , with no dependence on the tripping speed of an upstream breaker. The rigor of Eaton’s testing...

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