This electrical diagram shows a three-phase power system with voltages of 120V, 40V, and ground. It includes switches S2 and S3 that can connect various loads between phases and ground through keys A, D, and S.

3. X3
X2 40 V
V3 X6 X7
120 V
120 V 120 V
120 V
60 Hz
0Deg S2 X4
40 V
S3
Key = A X5 Key = D
40 V
J1
Key = S