Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual - Manual (Page 37)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 37
Installation & Wiring Chapter 2
Table 16 - Wiring Diagrams, External PT Connection
Core Balanced Ground Fault Sensor Application
The 193-EC3_ _ E3 Plus Overload Relays are intended to provide ground fault
protection when used with the external 193-CBCT_ Core Balanced Ground
Fault Sensor. The ground fault sensor mounts separately from the E3 Plus
Overload Relay and must be placed within three meters of the E3 Plus Overload
Relay. The customer-supplied power cable for wiring the ground fault sensor to
the E3 Plus Overload Relay must meet the specifications outlined in
Table 7 on
page 28 .
Power Cable Installation Requirements
• All power cables (including the neutral when used) must pass through the
sensor window. The equipment ground conductor (the conductor used to
carry the non-current-carrying metal parts of equipment, as defined by
Article 100 of the NEC) must not pass through the sensor window.
• The power cables through the sensor window should be straight, tightly
bundled, centered in the window, and perpendicular to the sensor for a
length equal to or greater than six times the cable diameter (including
insulation) from the sensor.
• All other conductors with available fault currents in excess of 1,000 A
should be placed a distance equal to or greater than six times the cable
diameter (including insulation) from the sensor.
• The power cables of the branch circuit to be protected by the E3 Plus
Overload Relay must not be grounded on the load side of the ground fault
sensor.
Load
Wye Connection with PTs Delta Connection with PTs
Line
L1 L2 L3 N/GRND
L1 L2 L3
Line
L1 L2 L3
L1 L2 L3
Load
Open Delta Connection with PTs
Line
L1 L2 L3
Load
L1 L2 L3