On April 4, 2015 a power cord disconnected from an MSA MM2K PAPR during doffing. The connector remained attached to the battery and the cord separated from the connector. Evidence suggests that prior damage to the elastomeric insulation compound and possible void spaces contributed to final failure. The load applied at final failure is unknown but likely less than required for a new connector. The connector design is not considered inherently defective, but it is not highly robust. The elastomeric insulation can be torn with sufficient force. The rigid edge of the connector housing likely increases stress at the interface during flexure or bending.
Lessons Learned: Normal pre-job checks are sufficient to catch an obvious problem. However, aggressive pre-job checks or abrupt snagging of the cable during use may cause damage to the connector that can lead to eventual failure.
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