Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
e. DC Wiring — Blue
f. Intrinsically Safe Wiring - Light Blue
g. Foreign Voltage — Yellow
C. Control Panel Loss of Power
1. Each control panel containing a PLC shall have an input configured to
alarm the operators upon loss of main control panel power. This alarm
shall be displayed on the SCADA nodes to alert the operators that
attention is required.
2. Each control panel containing a backup PLC shall have an input
configured in the main PLC to alarm the operators upon loss of backup
PLC power. This alarm shall be displayed on the SCADA nodes to alert
the operators that attention is required.
D. Control Panel Overcurrent Protection
1. All overcurrent protection devices shall be properly sized to protect the
devices and the loads to which they are associated.
2. Circuit Breakers
a. Circuit breakers in the panel shall be sized to protect the associated
equipment, and to provide the necessary power to operate.
3. Fuses
a. Glass fuses not associated with motor circuit protection shall be
specified as fast-acting style unless otherwise directed in the
manufacturer’s literature. Fuses associated with motor circuit
protection shall be specified as time delay style.
E. Lightning/Surge Suppression
1. Lightning/surge suppression shall be provided to protect the control panel
and associated equipment from surges on the incoming power circuits, or
those induced by lightning strikes and propagated along the signal or
power lines connected to the control panels. Surge protection shall be
provided by a qualified manufacturer complying with requirements in
Article 1.04. Surge protection shall be sized properly for its intended
purpose.
2. 120VAC surge suppression
a. The incoming 120VAC power source for the control panel shall be
provided with surge suppression in the control panel. Surge
suppressors shall be provided with an auxiliary contact, connected
to the PLC to indicate surge suppressor failure. Install surge
CONTROL SYSTEM EQUIPMENT PANELS AND RACKS
WOODARD & CURRAN 40 67 00-10
