Cause why the TN16PDU or TN51PDU board of the OSN 8800 can use only single-hole OT terminals

When the 35 mm^2 power cable is connected between a power distribution cabinet of the equipment room and the TN16PDU or TN51PDU board, the terminal connected to the TN16PDU or TN51PDU board must be single-hole. Because of limited space on the PDU, a dual-hole terminal may introduce interference between the holes.

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