You have been hired by a company to connect an outside lighting system to a panel box located 55 ft from the point of attachment. The conductors are to have Type THWN-2 insulation and the wire is copper. The termination temperature of the connections is not known. The lighting system is rated at 20 kW. The voltage is 240 V. Because the lights are expected to operate more than three hours at a time, they are considered continuous-duty. Using the NEC, determine the wire size needed to make this connection.
You have been hired by a company to connect an outside lighting system to a panel box located 55 ft from the point of attachment. The conductors are to have Type THWN-2 insulation and the wire is copper. The termination temperature of the connections is not known. The lighting system is rated at 20 kW. The voltage is 240 V. Because the lights are expected to operate more than three hours at a time, they are considered continuous-duty. Using the NEC, determine the wire size needed to make this connection.
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You are a journeyman electrician in an industrial plant. You have been assigned
the task of connecting a 25-kW electric heater to a 240-V, single-phase panel.
The heater is located in an area with an ambient temperature of 908F. The conductors
are to be copper with Type TW insulation. The heater is expected to operate for
more than three hours at a time. What size conductors would you use to connect
this heater?
by Bartleby Expert
