Nortel Passport 15000 Preparation Manual page 117

Anchoring a second frame beside and joining a first frame uses:
1 an identical footprint to the one shown in the figure "NEBS 2000
footprint measurements" (page 98) or at least measurements from it (for
example, the footprint space between the frames is fixed, but the
measurements at either end of the pair may be less if the optional
extended cable management brackets will never be added)
2 the pair of frames must be adjustable to the same height together
3 the frames must be fastened together by the frame-to-frame brackets and
levelled together before the pair are anchored to the floor
The floor must be pre-marked to accommodate adjacent frames to be fastened
together. Refer to "Marking the footprint and the anchor holes on the floor"
(page 112).
Passport 15000, 20000 Site Requirements and Preparation Guide
Chapter 3 Site preparation 117
5.2S2