Instructions

This calculations is based on NEC 220-30 (1999 Edition) and only applies to residential services where the following conditions are met:

Ampacity must be greater than 100 amps
Single phase, 3-wire service only.
Heating and cooling done locally and not centrally.
No Electric Space Heating.

Calculation Inputs

General Information

Description of Unit

Size of Unit

sqft

Is There A Laundry Room?

What is the Voltage that will Serve the Unit?

How much spare capacity do you want to plan for?

Fixed Appliances

Oven

volt-amps (watts)

Microwave

volt-amps (watts)

Disposal

volt-amps (watts)

Dishwasher

volt-amps (watts)

Jet Tub

volt-amps (watts)

Ice Maker

volt-amps (watts)

Clothes Washer

volt-amps (watts)

Clothes Dryer

volt-amps (watts)

Other

volt-amps (watts)

Heating and Cooling

Indoor Unit

volt-amps (watts)

Outdoor Unit

volt-amps (watts)

Other

volt-amps (watts)

Calculation Results

Demandable Load

General Lighting & Power

3 VA/sqft x _____

N/A

Related Calculators

Circtuits/Feeders

Power/Amps/Voltage Feeder/Voltage Drop Motors Transformers

Conduits

Conduit Tables Conduit Fill Tables Conduit Size Selector Duct Bank

Conductors

General Wire Properties Specific Wire Properties Conductor Insulation Tables

Miscellaneous

Box Fill Calculations Optional Residential

Manpower/Productivity

Manpower Projections Productivity Changes Hour Estimator

No guarantees are made as to the accuracy of the calculation or compliance with local codes. Verify all calculations with a professional engineer. If you find an error, or have a suggestion, please send us an email.