APC Basic Rack PDU Rackmount Power Strip - Manual (Page 5)

Installation Instructions and Specifications 5
Vertical mounting (any standard EIA-310 rack or enclosure)
Install the PDU in a NetShelter or any standard 19-inch EIA-310 rack or
enclosure, using the mounting brackets (provided).
1. Attach the vertical-mounting brackets to the PDU.
2. Install the PDU on a vertical mounting rail in your rack or enclosure.