Normal Operation
The SJB receives voltage on circuits 1231 (RD/WH), 906 (RD/OG) and 905 (GY/LB) and is grounded through circuits 1203 (BK/LB) and 1205 (BK).
The DSM receives voltage on circuits 566 (DG), 956 (OG/LG) and ground on circuits 1203 (BK/LB) and 1205 (BK).