Scully ST-47 Series - DWG 61345 - Principle of over Ll Prevention & Grounding

Self-Proving Vehicle Grounding Verication System
Diagram Appendix
Page 21.
Principle of Overll Prevention & Grounding
Note: Overll Prevention Components Shown in Italics
are manufactured by the Scully Signal Co.
Overll Prevention
Sensor & Holder
ST-47
Groundhog™
Ground Verication
Monitor
Overll Prevention
Monitor
Overll
Prevention
Socket
Ground
Verication Bolt
Plug &
Cable
Connector
Bottom Loaded Tank Truck or Trailer Loading Rack
Output
Signal
Product
From Pump
Flow
Control
Valve
Overll Detection Point
Typically set at 3% of maximum
compartment capcity
Emergency Shutdown
System Components
Mounted in Class I, Div 1, Group D
Hazardous Area
AC Power & Grounding
Control Wiring Inputs
Pump
Control
-OR-
Terminal
Automation
System
6.5 DWG 61345 – Principle of Overll Prevention & Grounding