2.5.2.3
EMI/RFI shielded boxes shall be designed to provide maximum shielding of
electric and magnetic components of radiated RF energy. RF filters shall
be provided to suppress conducted radio frequency in cables and conductors.
Shielded boxes shall provide attenuation greater than 60 db at 14.5 KHz to
greater than 100 db at 1 MHz for magnetic fields and greater than 100 db
from 14.5 KHz to 430 MHz for electric fields.
2.5.2.4
Finish
EMI/RFI shielded boxes shall be zinc-plated in accordance with ASTM B 633
SC3/Type II to provide corrosion-resistant conductive surfaces for gasket
contact area and conduit entries. The finish coat shall match the crane
finish.
2.5.3
Drum Grounding
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NOTE: A grounding drum is required for non-sparking
environment only (general nuclear or explosive).
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A copper ring/collector assembly shall be provided to ground each drum.
Ring shall be electrically-bonded to drum. Collector shall be stationary
and connected to equipment grounding conductor system with a No. 8 AWG
copper wire.
PART 3
EXECUTION
3.1
ERECTION
The entire crane erection shall be performed in accordance with
manufacturer's instructions under the full-time supervision of the
manufacturer's representative. Contractor shall provide a written
certificate from crane manufacturer indicating the crane is erected in
accordance with manufacturer's recommendations before testing the completed
installation.
3.1.1
Shop Assembly
Major crane components shall be shop assembled as completely as possible.
Disassembled parts shall be match marked and electrical connections tagged
after complete no-load shop testing. Parts and equipment at site shall be
protected from weather, damage, abuse and loss of identification. Erection
procedures shall ensure that the crane is erected without initial stresses,
forced or improvised fits, misalignments, nicks of high-strength structural
steel components, stress-raising welds and rough burrs. Damaged painted
surfaces shall be cleaned and repainted after crane is erected. All
necessary grease and oil of approved quality and grade for the initial
servicing and field test shall be provided by the Contractor.
3.1.2
Mechanical Alignment
Motors, couplings, brakes, gear boxes and drive components shall be aligned
when reinstalled in accordance with manufacturer's instructions.
SECTION 14630A
Page 50
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