Phase Designation. Electrical phases are designated with one of two designations as follows:
Phase A or L1.
Phase B or L2.
Phase C or L3.
Neutral (N) or LO.
Wiring Designation. Intemal wiring in the power distribution panel is marked with wire numbers to identify
connection points of the individual wires. Refer to Table 4-6 for wire markings.
Intemal wiring insulation is color coded to identify phasing. Insulation colors are as follows:
BLACK - phase A or L1
RED - phase B or L2
BLUE - phase C or L3
WHITE - Neutral or LO
GREEN - ground (GND)
Electrical Fault Isolation. To isolate a short or open drcuit, use a multimeter (Item 1, Appendix B). Refer to the
troubleshooting guide (Table 4-3) and the appropriate continuity checklist (Tables 4-4 and 4-5), and the wire run list
(Table 4-6). A measurement of continuity between two points listed in the tables as having no continuity indicates a short
drcuit. A measurement of no continuity between two points listed in the tables as having continuity indicates an open
drcuit. Refer to FO-1 for a schematic diagram of the power distribution panel.