SECTION 86
SIGNALS, LIGHTING AND ELECTRICAL SYSTEMS
646
or at the option of the Contractor, louvered vents with a permanent metal mesh or
4-ply woven polypropylene air filter held firmly in place, which will permit the fan
to pass the volume of air specified, may be substituted.
• Each controller cabinet shall be equipped with an electric fan with ball or roller
bearings and a capacity of at least 2.83 m
3
/min {100 cubic feet per min}.
• The fan shall be thermostatically controlled and shall be manually adjustable to
turn on between 32°C and 65°C with a differential of not more than 6°C between
automatic turn on and turn off. The cabinet fan circuit shall be fused at 125 percent
of the ampacity of the fan motor installed.
• The fan and cabinet vent holes shall be located with respect to each other so as
to direct the bulk of the air flow over the controller unit or through the ventilating
holes of the controller unit where those holes exist.
86-3.04C Cabinet Wiring
• Conductors used in controller cabinet wiring shall be No. 22, or larger, with a
minimum of 19 strands. Conductors shall conform to Military Specification
MIL-W-16878D, Type B or better. The insulation shall have a minimum thickness
of 0.25-mm {10 mil} and shall be nylon jacketed polyvinyl chloride or shall be
irradiated cross-link polyvinyl chloride, polyhalocarbon or polychloro-alkene,
except that, at the Contractor's option, conductors No. 14 and larger may be UL
Type THHN.
• At the Contractor's option, flat cable may be used in lieu of individual
conductors. Cable shall be constructed of No. 28, or larger, conductors. Conductor
insulation shall be rated at 300 V and shall be rated for use at 105°C. Cables shall
be provided with strain relief.
• Wiring within controller cabinets shall be neatly arranged and laced, or
enclosed in plastic tubing or raceway.
• Conductors used in controller cabinet wiring shall conform to the following
color-code requirements:
1. The grounded conductor of a circuit shall be identified by a continuous
white or natural gray color.
2. The equipment grounding conductor shall be identified by a continuous
green color or by a continuous green color with one or more yellow
stripes.
3. The ungrounded conductors shall be identified by any color not specified
in 1 or 2 above.
• Conductors used in cabinet wiring shall terminate with properly sized captive
or spring spade type terminals or shall be soldered to a through-panel solder lug on
the rear side of the terminal block. Crimp-style connectors shall be applied with a
proper tool which prevents opening of the handles until the crimp is completed.
• An equipment grounding conductor bus shall be provided in each controller
cabinet. The bus shall be grounded to the cabinet and shall be connected to the
metal conduit system or other approved ground with a No. 8, or larger, grounding
conductor.
• With all the cabinet equipment in place and connected, the resistance between
the grounded conductor terminal bus and the equipment grounding conductor bus
shall be 50 M
.
, minimum, when measured with an applied voltage of 150 V (dc).



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