A 120/240V single-phase, 3-wire feeder supplies two separate panelboards in a commercial building. According to 200.4(A), how many neutral conductors are required for these two sets of ungrounded feeder conductors?

• Two neutral conductors, one for each feeder.
• One neutral conductor may be shared by both feeders.
• No neutral conductor is required for feeders.
• The number of neutrals is determined by the calculated load.