A 274 m2 (2950 ft2) dwelling is supplied by a single-phase, 120/240 V service and has the following loads: 1.8 kVA dishwasher, 120 V; 1.2 kVA compactor, 120 V; 1.0 kVA disposal, 120 V; 0.5 kVA vent fan, 120 V; 16 kVA range, 240 V; 4.5 kVA dryer, 240 V; 15 kVA heating unit, 240 V; 9 kVA air conditioning unit, 240 V; and 6.5 kVA water heater, 240 V.

(a) Using the standard method, size the THW service entrance conductors (A, B, and N).

(b) Size the main breaker and the grounding conductor.

(c) Determine the minimum number of 15 A branch circuits required for general lighting and receptacles.