Rockwell Automation Publication 1512A-UM101B-EN-P - December 2021
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Chapter 3 Installation – Arc-Resistant
Seismic Applications
•
For installation on concrete –
the minimum depth and radius of concrete
supporting the cabinet anchors is dependent on seismic loads. Refer to
important information above.
•
For installation on a metal structure –
the metal plate depth and cabinet
anchoring method is dependent on seismic loads.
Joining Sections
The mounting surface for the equipment must be flat and within ±1 mm per
meter. Installing metal shims is an acceptable method of compensating for
mounting surfaces that are out of tolerance. Mounting surfaces that are not
flat may inhibit proper set-up and operation of the latches and interlocks.
1. Remove the side bus access covers if applicable.
2. Position the left side section on a level surface and secure the section in
place with M12 (1/2 in.) floor mounting bolts (refer to
3. When joining ArcShield sections, apply a continuous 3 mm (1/8 in.) wide
bead of silicon sealer around the entire outer perimeter of one section
AND around the cutout for the power bus.
4. Position the right section against the left section. Ensure that the surface
is level.
5. Secure the sections together using the 1/4-20 self-tapping screws (12 lb•ft
[15N•m]). Thread the screw through the 7 mm (0.281 in.) clearance hole to
the corresponding 6 mm (0.219 in.) pilot hole. To access the rear
clearance holes, remove the rear covers of the starter. If rear access is not
available, refer to
Front Access to Power Bus (Bottom Entry/Exit) on
or
Front Access – Top Incoming Line Cables (Top Entry/Exit) on
.
6. Use the provided 1/4-20 thread fasteners (12 lb•ft [15 N•m]) to secure the
entire perimeter of the horizontal bus. Confirm there is a continuous
bead of silicone seal around the bus bar opening on one cabinet.
7. Secure the right section to the floor using M12 (1/2 in.) floor mounting
).
Joining hardware can be found in a package that is mounted to
the front of the shipping skid. See publication
for level
floor surface requirements.
IMPORTANT
To prevent arc gas from escaping, all mounting holes on the sides and
floor of the enclosure must have hardware installed.
ArcShield units at the end of a line-up have a ground connection
to the outside side bus access cover (see
and
). This connection must be maintained to ensure unit
arc resistant performance.
