Assign different schedules for different ElectricEquipmentLoads to the same zone

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You are almost there. You have assigned a default schedule to be used for plug loads instances for the space type. All you need to do is take schedule to represent the elevator fractional schedule from the "My Model" or "Library" tab and drag and drop that onto the box in the Schedule column at the elevator load instance row (next to the elevator definition). This will override the default schedule.