Lever Assembly - NEBS
Original Publication Date: 2003-Sep-25
Included in the Prior Art Database: 2003-Sep-25
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The following description deals with a lever for NEBS (network equipment building systems) rated circuit packs. The lever is used to prevent EMC (Electromagnetic Compatibility) or ESD (Electrostatic Discharge) faults at the board level and to secure the circuit pack, via a cam device, into NEBS rated subracks. The previously used lever was made of plastic, and when assembled to the circuit pack, there were large air gaps between the lever and the pack. This allowed for ESD zaps that would reach the PWB (Printed Wiring Board) and cause faults. It also allowed for EMC issues to arise relative to meeting the NEBS3 (NEBS standard 3) requirements of customers. The new lever is made of metal (e.g. die-cast aluminum) and mounts directly to the circuit pack PWB (Printed Wiring Board). The lever includes and provides the cam feature which secures the circuit pack to the subrack. The new design fits through an opening in the faceplate and attaches to the PWB (cf. fig. 1). The lever when closed locks the circuit pack into the subrack and seals to an EMI (Electromagnetic Interference) foam gasket at the opening in the faceplate. Thus, when the lever is in the closed and locked position, an effective ground plane is created between the lever, faceplate and subrack, thereby preventing any EMC/ESD faults and passing all related tests for NEBS3 compliance.