Nortel Passport 15000 Preparation Manual page 107

(18 in.) long. Allow for adding the height of the post level. See the figure
"Drilling a raised floor without removable tiles" (page 109).
7 For a cement floor or a raised floor without removable panels, remove the
debris from the bottom of the drilled holes by taping a tube to the vacuum
nozzle. The tube must be long enough and narrow enough to reach the
bottoms of the holes.
For a raised floor with removable panels, lift a nearby panel to vacuum the
drill bit debris from the lower surface.
CAUTION
Risk of improper equipment grounding
When an anchor hole exposes conductive construction
materials (for example, rebar) in a cement floor and the
anchor contacts it, there is a possibility that the isolator
bushing around the anchor can fail from earthquake
vibrations. The contact with the rebar risks having the
building ground interfere with the site ground that the
frame is grounded to. Never use anchor hole that exposes
conductive material in the hole.
8 Look inside each hole to verify that no conductive construction material
(rebar) has been exposed by the hole.
When a hole exposes such material, drill a hole at the other end of the
oval opening. If the second hole hits more conductive construction
material, use another oval hole.
9 Cover the holes with tape to keep them clean until the anchors are
actually installed.
Passport 15000, 20000 Site Requirements and Preparation Guide
Chapter 3 Site preparation 107
5.2S2