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Page 332 of 436
NN43021-310
Standard 06.01
Installing earthquake bracing
Procedure 57
Drilling concrete floors
This procedure applies only to installations into concrete
floors.
1
Using the equipment room floor plan mark the position of all of the
columns.
2
Center-punch each of the hole centers.
3
Using a carbide-tipped drill bit, hammer drill the holes to the size and
depth shown in Table 61 on
Table 61
Anchor hole sizes
Kit
Order Code
A
NT8D64BE
B
NT8D64CF
Note: Special care should be taken in drilling the holes. The holes have
to be drilled straight and perpendicular to the floor surface in order for the
anchors to be installed correctly. The drill fixture kit can aid this process.
4
Should you hit reinforcing bar or the hole breaks through, abandon that
hole and use the secondary hole location indicated in the anchor hole
template.
5
Remove any debris from the holes with a blowout bulb or compressed air.
Use a vacuum to dispose of the debris.
6
If the mounting plates are not to be installed immediately, cover the
anchor holes to prevent debris from falling into them.
March 2013
IMPORTANT!
page
332.
Hole diameter
25.4 mm (1 in.)
24 mm (15/16 in.)
End of Procedure
Hole depth
78.7 mm (3.1 in.)
125 mm (4 15/16 in.)
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