3. I
NSTALLATION
ITS functionality requires that the B-SIDE (device side) of the test block must be
connected with the device to be tested (e.g. protective relay), and the A-SIDE (system
side) must be connected to the electrical system (e.g. CTs, PTs and breakers).
Following figures represent the top, back and bottom side labeling of a typical ITS
Test Block.
7-pole Models
7 6 5 4 3 2 1
3
1
2
4
5
6
a
3
1
2
4
5
6
b
10
