Specifications - State of Delaware

SECTION 262213 - TRANSFORMERS: continued
C. Provide bracing and supports to resist the forces of a Seismic Zone 2A event without collapse
or over-turning of the transformer.
D. Do not mount transformer within 40 inches of cable tray.
E. Provide concrete raised housekeeping pads for floor-mounted transformer.
3.03 GROUNDING:
A. Provide equipment grounding connections for transformers as specified, indicated, and as
required. Tighten connections to comply with tightening torques specified in UL 486A to
assure permanent and effective grounding. Provide grounding in accordance with
SECTION 260526.
3.04 IDENTIFICATION:
A. Provide identification of transformers as specified in SECTION 260553 - ELECTRICAL
IDENTIFICATION.
3.05 TESTING:
A. Prior to energization of transformers, check all accessible connections for compliance with
manufacturer's torque tightening specifications. Clean out any dust and dirt.
B. Prior to energization, check circuitry for electrical continuity and for short circuits.
C. Perform insulation resistance test: High-voltage winding to low-voltage winding, low-voltage
winding to ground, and high-voltage winding to ground. Record and submit test results.
D. Perform transformer turns ratio test (TTR) on the full winding and all taps. Record and submit
test results.
E. Upon completion of installation of transformers and testing, energize primary circuitry at rated
voltage and frequency from normal power source, and test transformers, including, but not
limited to, audible sound levels, to demonstrate capability and compliance with requirements.
Where possible, correct malfunctioning units at the site then retest to demonstrate compliance;
otherwise, remove and replace with new units or components and proceed with retesting.
F. Adjust transformer primary taps for nominal system voltage at initial installation and again
when the transformer reaches its designed "full" load condition after occupancy by the
Contracting Officer. Schedule all required electrical outages with the Contracting Officer.
END OF SECTION 262213
262213-4 DEAN262213.DOC