Issue
When removing the screws from the terminal there are sparks

Product Line
Current Transformer
Shorting Block

Environment
Current inputs

Cause
A high potential within the secondary side of the CT

Resolution
*Warning:  Installation and maintenance of this device should only be performed by qualified, competent personnel that have appropriate training and experience with high voltage and current devices. Failure to follow the instructions / warnings in the Meter Installation Guide can result in permanent damage to the meter, severe injury or death.*

No, You should never see sparks when taking the shorting screws out. This is an indication that the secondary of the shorting block and CT's are not connected properly to the Circuit Monitor. The spark is generated by a high potential which is typical of an open secondary on a CT. If this should happens, immediately reconnect the screw and check the wiring.