Eaton Magnum DS Instruction Booklet

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9Instruction Booklet IB01900001EEffective August 2017Instructions for Magnum DS Metal-EnclosedLow-Voltage ARC Resistant Switchgear AssembliesEATON www.eaton.com3.4 Breaker BellowsTo provide an additional degree of protection to the operator inevent of an arcing event, arc resistant assemblies are equippedwith one breaker bellows in each cell containing a draw-out circuitbreaker (See Figure 6). The bellows is installed on the door and careshould be taken to prevent damage to the bellows when the door isopened.This breaker bellows provides a seal around the front of the breakerthat prevents dangerous arc gasses from escaping around the faceof the breaker in an arcing event. For this reason, it is importantthat the bellows be in the correct position when the breaker door isclosed (See Figure 7). When closing the breaker door, ensure that allfour corners of the bellows pass around all four corners on the faceof the breaker. Figure 8 shows the bellows in the incorrect position.When racking the breaker from disconnect position to the connectposition, the breaker bellows will move with the breaker.WARNINGIT IS IMPORTANT TO PERIODICALLY INSPECT THE BREAKER BELLOWS FORDAMAGE. ANY HOLES, RIPS, TEARS, DEFORMATION, OR CRACKS INDICATETHE BELLOWS (PART # 87C0111H01) SHOULD BE REPLACED.DANGERCLOSING THE BREAKER DOOR AFTER RACKING THE BREAKER TO THE“CONNECT” POSITION WILL PREVENT THE BELLOWS FROM SEALINGPROPERLY. ALWAYS VERIFY THAT THE BREAKER IS IN THE “DISCONNECT”POSITION WHEN CLOSING THE DOOR. ALWAYS VERIFY THE BELLOWS FITSSECURELY AROUND THE BREAKER FACE WHEN CLOSING THE DOOR.3.5 Bus CompartmentExhaust openings exist in the top of the bus compartment. Theseopenings allow for dangerous gasses to escape the assembly duringan arcing event.For arc resistant assemblies not equipped with the optional plenum,(see Section 3.6), the exhaust openings in the top of the bus com-partment are sealed with a pressure relief flap designed to open dur-ing an arcing event. The flaps are held closed with plastic inserts thatwill break loose and allow the flaps to open during an arcing event.WARNINGWHEN THE PRESSURE RELIEF FLAPS ARE INSTALLED, IT IS CRUCIAL THATTHE PLASTIC INSERTS ARE PRESENT TO HOLD ALL FLAPS DOWN. USEOF ANY OTHER MEANS (I.E. BOLT AND WASHER) OR REMOVAL OF THEPLASTIC INSERTS WILL VOID THE ARC RESISTANT RATING.Figure 6. Beaker Bellows On Open Breaker Door.Figure 7. Breaker Bellows On Closed Breaker Door.Figure 8. Breaker Bellows In Incorrect Position.