**************************************************************************
Enclosures for each panel shall be a single door, wall-mounted box
conforming to NEMA 250 with a continuous hinged and gasketed exterior door
with a print pocket, key lock, and interior back panel. Inside finish
shall be white enamel, and outside finish shall be gray primer over
phosphatized surfaces.
2.15.4
Mounting and Labeling
Provide pilot lights, switches, panel-mounted control devices, and pressure
gages shall be mounted on the door. Power conditioners, fuses, and duplex
outlets shall be mounted on the interior of the cabinet. Other components
housed in the panel shall be mounted on the interior back panel surface of
the enclosure and shall be identified by plastic or metal nameplates which
are mechanically attached to the panel. Lettering shall be cut or stamped
into the nameplate to a depth of not less than 0.4 mm 1/64 inch, and shall
have contrasting color, produced by filling with enamel or lacquer or by
use of laminated material. Painting of lettering directly on the surface
of the door or interior back panel is not permitted.
2.15.5
Wiring and Tubing
a.
Pneumatic device inputs and outputs shall be piped to bulkhead
fittings in the bottom of the panel with a 50 mm 2 inch loop to
facilitate replacement. Electric, electronic, and
electropneumatic device signals entering and leaving the panel
shall be wired to identified terminal blocks.
b.
Wiring shall be installed in wiring ducts so that devices can be
added or replaced without disturbing existing wiring that is not
affected by the change. Wiring to single-loop controllers shall
have a 100 mm 4 inch wiring loop in the horizontal wiring duct at
each wiring connection. There shall be no wiring splices within
the control panel. Interconnections required for power or signals
shall be made on device terminals, if available, or panel terminal
blocks, with not more than two wires connected to each terminal.
c.
Instrument signal grounds at the same reference level shall end at
a grounding terminal connected to a common ground point for that
level. Wiring shield grounds at the same reference level shall
end at a grounding terminal connected to a common ground point for
that level. Grounding terminal blocks shall be identified by
reference level.
d.
Wiring connected to controllers shall be identified by function
and polarity, e.g., process variable input and remote setpoint
input and output.
2.16
COMPRESSED AIR STATIONS
Provide compressed air stations.
2.16.1
Air Compressor Assembly
**************************************************************************
NOTE: In that are additions to existing control
systems, do not add additional loads or reuse
existing control compressor unless it is verified by
SECTION 15901N
Page 38
Previous Page
