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Which EM4800 Current Transformers (CT's) require shorting blocks?

FA210419

12/07/2018

Issue
Need to know which EM4800 CTs need shorting blocks. 
 
Product Line
E(M)4800
 
Environment
Installation of the shorting block with EM4800 CT's.
 
Resolution
When using 80 mA CTs or 5 A CT's, shorting blocks are recommended. 333 mV CT's do not require shorting blocks because they have a burden resistor built into the CT that limits the output voltage to 333 mV under all conditions. 

NOTE: If a 1/3 V CT was shorted, the internal burden resistor and the CT would be shorted at the same time. This would effectively be the same as shorting a current secondary CT and would cause no harm, despite the fact that it is not needed.