Determine the minimum-size Cu GEC required for a (120)/(208)V, 3phase, 4-wire service which consists of four (1)/(0) AWG THW Cu conductors per phase. The grounding electrode is effectively grounded building steel.
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To determine the minimum-size Grounding Electrode Conductor (GEC) required for a 120/208V, 3-phase, 4-wire service with four (1/0) AWG THW copper conductors per phase, follow these steps: ** Show more…
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Calculate the minimum size of copper service-entrance conductors and grounding electrode conductor required for a residence containing the following: floor area is 24 ft x 38 ft (7.3 m x 11.6 m). The dwelling will have: * a 12-kW, 120/240 volt electric range. * a 5-kW, 120/240 volt electric clothes dryer consisting of a 4-kW, 240-volt heating element, a 120-volt motor, and 120-volt lamp that have a combined load of 1 kW. * a 2200-watt, 120-volt sauna heater. * six individually controlled 2-kW, 240-volt baseboard electric heaters. * a 12-ampere, 240-volt air conditioner. * a 3-kW, 240-volt electric water heater. * a 1000-watt, 120-volt dishwasher. * a 7.2 ampere, 120-volt food waste disposer. * a 5.8-ampere, 120-volt attic exhaust fan. Determine the sizes of the ungrounded "hot" conductors and the neutral conductor. Use Type THWN. Use 310.15(B)(7). Also determine the correct size grounding electrode conductor. Do not forget to include the required two 20-ampere small appliance-circuits and the laundry circuit. The panel board is marked 75 degree Celsius terminations. You may use the blank Single-Family Dwelling Service-Entrance Calculation form in the Appendix of this text, or use the form as a guide to make your calculations in the proper steps. Two ___________ AWG THWN ungrounded "hot" conductors One ___________ AWG THWN or bare neutral conductor One ___________ AWG THWN grounding electrode conductor
Adi S.
Crystal W.
A 4-conductor, metal-clad cable is used as the feeder for a 120/208-volt panel supplying discharge lighting. The 3/0 AWG copper conductors have 90°C insulation and the cable is installed in an area with an ambient temperature of 42°C. What is the ampacity of each 3/0 AWG conductor?
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