Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 28)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 29
Installation and Wiring Chapter 2
secondary current and the wiring burden. Finally, the CT shall be rated for
protective relaying to accommodate the high inrush currents associated with
motor startup and shall have an accuracy of
≤ ±2% over its normal operating
range. Typical CT ratings include:
Installation Instructions
Cat. No. 193-EC_ZZ current monitoring relays are designed to be installed in
cat. no. 193-ECPM2 panel mount adapters and connected to separately mounted
current transformers. For panel mount adapter assembly, refer to the instructions
included with the panel mount adapter.The EC4 Current Monitoring Relay must
be mounted a distance equal to or greater than six times the cable diameter
(including insulation) from the nearest current-carrying conductor or current
transformer. For applications employing multiple conductors per phase, the
diameter of each cable should be added and multiplied by six to determine the
proper placement distance for the EC4 Current Monitoring Relay.
Figure 12 - Cat. No. 193-EC_ZZ Current Monitoring Relay Mounting Placement
ANSI (USA) Class C5 B0.1
CSA (Canada) Class 10L5
IEC (Europe) 5 VA Class 5P10
ATTENTION: The improper selection of a current transformer can
result in the EC4 Current Monitoring Relay reporting inaccurate
motor operational data, and possible motor damage. The selected
current transformer must be rated for protective relaying
applications.
ATTENTION: Placement of the EC4 Current Monitoring Relay
closer than the recommended distance of six times the cable
diameter may compromise its current reporting and protection
capabilities.
6x
6x
OR
Primary
Current
Transformers
E3 Overload
Relay