Final answer:
The maximum fill ratio percentage by cross-sectional area for a conduit with one cable is 40% according to the NEC.
Step-by-step explanation:
The maximum fill ratio percentage by cross-sectional area for a conduit with one cable is determined by the National Electrical Code (NEC).
According to the NEC, the maximum fill ratio for a conduit is 40%. The maximum fill ratio percentage by cross-sectional area for a conduit with one cable is 40% according to the NEC.
This means that the total cross-sectional area of the cable(s) should not exceed 40% of the total cross-sectional area of the conduit.
For example, if the conduit has a cross-sectional area of 100 square inches, the total cross-sectional area of the cable(s) should not exceed 40 square inches.