Project Number: 228730
Issue Date: August 2017
WWTE SCADA Upgrades
Nashua, NH
suppression in strict accordance with manufacturer’s
recommendations.
3. Analog signal surge suppression
a.
Analog signals connected to equipment or instrumentation that is
located outside the building where the control panel is installed
shall be supplied with German Institute for Standardization
(DIN) rail mounted surge suppression in the control panel. Provide
surge protection at both ends of the signal cable and mount surge
protection as close to the equipment, instrument, or termination
point as possible. Provide with a minimum of 10kA surge current
suppression.
4. Telephone Line and Ethernet surge suppression
a.
Copper-based telephone lines and Ethernet cabling connected to
the control panel that leaves the building where the control panel is
installed shall be provided with surge suppression in the control
panel. Provide surge protection at both ends of the telephone or
Ethernet cabling and mount surge protection as close to the
termination point as possible.
F. Selector Switches, Pushbuttons and Pilot Lights
1. All selector switches, pushbuttons, and pilot lights required for the
enclosures shall be provided in accordance with Section 26 27 26, Wiring
Devices and Miscellaneous Electrical Equipment.
G. Uninterruptible Power Supplies
1. Each control panel containing a PLC shall be provided with an
uninterruptible power supply (UPS) sized to provide a minimum of
10 minutes of power in the event of main control power loss. The UPS
shall be provided with relay contact outputs, connected to the PLC, to
indicate UPS fault and UPS low battery conditions.
H. Ethernet Switches
1. Ethernet switches shall be configured to accept the number of connections
shown on the Drawings.
2. Ethernet switches shall be provided with a minimum of 20 percent spare
RJ-45 ports available for future expansion.
WOODARD & CURRAN
CONTROL SYSTEM EQUIPMENT PANELS AND RACKS
40 67 00-11
