Juniper MX480 Hardware Manual page 323

327
As you carry the DPC, do not bump it against anything. DPC components are fragile.
Never hold or grasp the DPC anywhere except places that this document indicates. In particular, never
grasp the connector edge, especially at the power connector in the corner where the connector and bottom
edges meet. See Figure 112 on page 327.
Figure 112: Do Not Grasp the Connector Edge
Never carry the DPC by the faceplate with only one hand.
Do not rest any edge of a DPC directly against a hard surface (see Figure 113 on page 328).
Do not stack DPCs.