Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
I. Seal Fail and Motor Temperature Relays
1. Pumps, or mixers, equipped with proprietary seal fail and motor
temperature relays, shall require these relays to be mounted in the SCADA
control panel unless otherwise noted in the Drawings. The seal fail and
motor over temperature alarm contacts shall be connected to the PLC as
discrete inputs.
J. Intrinsic Safety Barrier Panels
1. Intrinsic safety barriers required for interfacing with equipment and
instruments located in a classified area shall be mounted in a panel
separate from the control panels.
2. Panels housing intrinsic safety barriers shall be laid out to facilitate
separation of hazardous and non-hazardous wiring. Wireway containing
hazardous area wiring shall be clearly indicated as such.
K. Equipment Mounting/Arrangement
1. All components shall be mounted in a manner that permits servicing,
adjustment, testing and removal without disconnecting, moving or
removing any other component. Components mounted on the inside of
panels shall be mounted on removable plates and not directly to the
enclosure. Mounting shall be rigid and stable unless shock mounting 1s
required by the manufacturer to protect equipment from vibration.
Components shall be identified with suitable plastic or metal engraved
tags attached with drive pins adjacent to each component, identifying the
component in accordance with the Drawings and Specifications.
2. All exterior panel mounted equipment shall be installed with suitable
gaskets, faceplates, or covers required to maintain the NEMA rating of the
panel.
3. A minimum of 1-1/2 inches shall be provided between panel wireway and
terminal blocks, to insure that wiring can be accessed easily.
4. Maintain manufacturer recommended spacing around panel-mounted
equipment, for heating and ventilation concerns.
5. ISA Recommended Practice RP60.3 shall be used as a guide in layout and
arrangement of panels and panel mounted components.
CONTROL SYSTEM EQUIPMENT PANELS AND RACKS
WOODARD & CURRAN 40 67 00-12
