2.6.4
Molded Case Circuit Breakers in Unit Compartments
Molded case circuit breakers for installation in unit compartments shall
meet the requirements of paragraph MOLDED CASE CIRCUIT BREAKERS above.
2.6.5
Panelboards for Motor Control Centers
Panelboards shall meet the requirements of paragraph PANELBOARDS.
2.6.6
Distribution Transformers
Dry type transformers for power and lighting loads shall be furnished with
voltage and kVA ratings as indicated on the drawings. The transformers
shall conform to the requirements for general-purpose transformers in NEMA
ST 20. Each transformer shall be protected on the primary side with a
molded case circuit breaker as indicated on the drawings. [Transformers
shall be drawout type.]
2.6.7
[Ground Detector Indicator
**************************************************************************
NOTE: Ground detectors requirements should be
evaluated and this paragraph deleted when not
required.
**************************************************************************
Ground-detector indicator (GDI) shall be rated 120-volts; have three lamps,
one per phase, three 480-120 volt transformers connected delta-wye,
adjustable loading resistor for balancing capacitive charging current, and
push-to test-switch. GDI shall provide visual indication of a single
ground-fault on any phase (A, B, or C) of a three-phase, three-wire
ungrounded power system. When no phase is grounded, all lamps shall glow
at partial brightness, giving long lamp life, the push-to test switch shall
not affect the brightness of any lamp. When a single ground-fault occurs
on any phase, the lamp that corresponds to the faulted phase shall be dark
and the other two lamps shall glow at full brightness. The push-to-test
switch shall cause all lamps to return to partial brightness, showing the
GDI is functioning properly.]
2.6.8
Wiring for Motor Control Centers
All wiring shall meet the requirements of paragraph WIRING above.
Heavy-duty clamp type terminals shall be provided by the Contractor for
terminating all power cables entering the control centers.
2.6.8.1
Contractor's Wiring
The Contractor's wiring shall be formed into groups, suitably bound
together, properly supported and run straight horizontally or vertically.
There shall be no splices in the wiring. The manufacturer's standard
pressure-type wire terminations for connections to internal devices will be
acceptable. Terminal blocks shall be added for wiring to devices having
leads instead of terminals. Ring tongue indented terminals shall be used
on all wires terminated on control terminal blocks for external or
interpanel connections and at shipping splits. All stud terminals shall
have contact nuts and either locking nuts or lockwashers.
SECTION 16403A
Page 26
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