Enclosures - Siemens System 3 Manual

Section III — Equipment Descriptions and Functions

3. ENCLOSURES

EA-32, EA-33, and EA-35 ENCLOSURE
The selection of the required number of modules
for a given system determines the necessary
enclosure size. The enclosure model number
indicates the number of module rows: the EA-32
has two, the EA-33 has three, and the EA-35 has
five. Each module row contains eight module
spaces, but some modules require more than
one space. On large systems it may be desirable
or necessary to use more than one enclosure.
This can be accomplished through the use of the
DM-31 distribution module, which is used as a
terminal strip.
SHOCK MOUNTING FOR ENCLOSURES
All enclosures should be shock mounted and drip
proof with an upper door shroud and Lexan
window lenses. A US Coast Guard approval
nameplate must be affixed to the door. (See Spec
Sheet Catalog No. 3325 for sizes and dimensions
and pages 8-9 for shock-mount and drip-proof
shroud installation.)
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ASSEMBLY INSTRUCTIONS FOR COAST
GUARD MOUNTING KIT VIK-1
1. On the Table on page 9 locate the
enclosure model to be installed. Determine
the number of isolators to be used and the
distance between the isolator centers.
2. Mark isolator centers to be used on the
bulkhead and draw perpendicular lines
through each of the centers.
3. Drill 5/16 inch clearance holes into bulk-head.
Mount isolator to bulkhead with 1/4-20x3/4"
cap screw, washer and lockwasher. Tighten
to 13 ft-lbs of torque. Refer to the stud
assembly illustration (Figure 1, page 9) for
the proper hardware sequence.
4. Mount the enclosure to the isolators (Refer to
the Mounting Diagram, Figure 2, page 9) with
1/4-20x1/2" cap screw, washer and
lockwasher. Tighten to 13 ft-lbs of torque.
NOTES: Flexible conduit or cable with a
maximum diameter of 3/4 inch and a
minimum length of 18 inches from a
rigid connection should be used to
house external wiring.
PTR-1 POWER TRANSFER RELAY
The PTR-1 is an automatic power transfer relay
that transfers power from the main generators, at
a 15% to 20% potential reduction, to the backup
generators. This automatic transfer creates an
audible and visual system trouble signal. The
PTR-1 is in its own enclosure. (See Appendix for
PTR-1 Connections, Cover, and Enclosure.)