Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
condensing. The field mounted equipment and system components shall
be designed for installation in dusty, humid, and slightly corrosive service
conditions.
3. Equipment installed in a hazardous area shall meet Class, Group, and
Division to comply with the NFPA 70 and CCR, Title 8, Electrical and
General Safety Orders.
4. All equipment, cabinets, and devices furnished shall be heavy duty type,
designed for continuous industrial service. The PLC system shall contain
products of a single manufacturer, and shall consist of equipment models
which are currently in production.
5. The following paragraphs describe general fabrication requirements of
control panels, enclosures, consoles, and cabinets. All control panel
assemblies shall be UL listed, to comply with UL 508A standards.
6. Control panel enclosures shall be sized to provide at least 20 percent spare
space, for future expansion, addition of panel components, etc. This shall
minimize impact of the addition of unintended equipment during the
checkout and startup phases.
7. PLC hardware provided shall accommodate a minimum 20 percent spare
of each I/O type used in the panel, wired to terminals during the
fabrication process. This shall minimize impact of unintended I/O
requirements added during the checkout and startup phases of the Project.
B. Wiring
1. All interconnecting wiring shall be stranded and shall have 600 volt
insulation and be rated for not less than 90 degrees Celsius.
2. Power distribution wiring on the line side of fuses shall conform to
Division 26 requirements.
3. Power and low voltage DC wiring systems shall be routed in separate
wireways. Crossing of power distribution wiring and control wiring shall
be at right angles. Different system wires routed parallel to each other
shall be separated by at least 6 inches. Different wiring systems shall
terminate on separate terminal blocks. Wiring troughs shall not be filled to
more than 60 percent visible fill.
4. All wiring shall terminate onto single-or-double tier terminal blocks,
where each terminal is uniquely and sequentially numbered. Direct
interlock wiring between equipment is not allowed. The control panel
shall be fabricated with minimum 20 percent spare terminals. Terminal
blocks shall be arranged in vertical rows and separated into groups; power,
CONTROL SYSTEM EQUIPMENT PANELS AND RACKS
WOODARD & CURRAN 40 67 00-8
