Use the Multiplier field to specify the number of appliances the load represents.Ģ20.55 Electrical Cooking Appliances in Dwelling Units and Household Cooking Appliances Used in Instructional Programs. You must specify a value of at least 5 kVA for the load on the dryer. Use the Dwelling Unit: Electric Dryer load type for electric dryers.
Calculate the service demand locad code#
Set the Load Calculation Method to General Commercial or Dwelling Unit, Section III to use this code section. Use the Multiplier field to specify the number of appliances the load represents.Ģ20.54 Electrical Clothes Dryers - Dwelling Unit(s). If the appliance is also a motor, use the Dwelling Unit: Appliance Motor load type. Use the Dwelling Unit: Appliance, Continuous or Dwelling Unit: Appliance, Noncontinuous load type for devices that are appliances.
If the load on the devices is greater than 1.5 kVA, the actual device load is used.Ģ20.53 Appliance Load - Dwelling Unit(s). Set the Load Calculation Method to General Commercial or Dwelling Unit, Section III to use this code section. The load on the circuit will be at least 1.5 kVA. Use the Dwelling Unit: Laundry load type for devices on a laundry circuit. If any devices with this load type are on a circuit, the load on the circuit will be 1.5 kVA. The specific load on the device does not matter. (A) Small-Appliance Circuit Load. Use the Dwelling Unit: Small Appliance load type for devices that are on a small appliance circuit. Use the General: Heating load type for devices that should be calculated based upon this section.Ģ20.52 Small-Appliance and Laundry Loads - Dwelling Unit.
Calculate the service demand locad how to#
See the Motor Load Calculations article for a description of how to use the Single Motor and Multiple Motor fields to specify motors.Ģ20.51 Fixed Electrical Space Heating. The load on the panel will be based upon NEC Table 220.44.Ģ20.50 Motors. Typically, the load for each receptacle will be 0.18 kVA. Use the General: Receptacles load type for receptacles that should be calculated based upon this section. Draft the lighting by either inserting light fixtures that are not circuited or have 0 load, or using standard CAD drafting commands to insert light fixtures that are not connected to the Design Master Electrical database.Ģ20.44 Receptacle Loads - Other Than Dwelling Units. Circuit the fixtures normally.įixed Loads: Use the General: Lighting load type for show-window or track lighting. Insert fixtures on the drawing to represent the appropriate length of show window or track. For track lighting, each fixture will represent 2 feet of track. For show windows, each fixture will represent 1 linear foot of show window. Either create a fixture to represent the load or use fixed loads.Ĭreate a Fixture: Create a fixture in the Light Fixture Project Schedule to represent the load. Set the Demand Factor to Other (Continuous) or Other (Noncontinuous).Ģ20.43 Show-Window and Track Lighting. If none of the types is applicable, select Custom and use the Description and Unit Load fields to define the occupancy type. Set the Demand Factor to Warehouse.Īll others: Set the Type of Occupancy to the most appropriate type based upon NEC Table 220.12. Warehouses: Set the Type of Occupancy to Warehouse. Hotels and motels: Set the Type of Occupancy to Hotel or Motel. The area on a panel is the sum of the areas specified in the Occupancy Areas section for that panel and all of the areas of the panels connected to it.ĭwelling units: Set the Type of Occupancy to Dwelling Unit. The areas will be carried up to the upstream panels. Set the areas on the panels furthest from the utility.
In the Feeder and Service Calculation Settings dialog box, use the Occupancy Areas section to set the occupancy areas associated with the panel. Otherwise, all lighting has a calculated load of 125%. To use the demand factors for general lighting in Table 220.42, you must also use the general lighting calculations. Feeder and Service Load CalculationsĢ20.42 General Lighting. To assign fixed loads to a circuit, in the Circuiting dialog box, press the Set Circuit Information button. References will be made to fixed loads and load types throughout this article. To set the load calculation method for a panel, in the Panel dialog box, press the Feeder and Service Calculation Settings button. References will be made to load calculation methods throughout this article. You can then look up the appropriate section below and see how to model it. This article is intended to be used as a reference together with the NEC and is based on the assumption that you know which section in the NEC you need to comply with.
This article lists each code reference and how to properly set up your model for that calculation. Design Master Electrical can calculate feeder and service loads based upon NEC 220 Part III and Part IV.
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