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Fixed Appliance Demand Load Calculator

Get the NEC 220.53 demand load for a dwelling's fastened-in-place appliances. Enter each appliance nameplate, and the calculator applies the 75% demand factor when four or more are present (100% otherwise), reporting the demand load in VA and kW with the connected load and demand current for reference.

Fastened-in-place appliances

Enter each fastened-in-place appliance's nameplate rating in VA (watts) as a separate load: water heater, dishwasher, disposal, trash compactor, built-in microwave, attic fan, and the like. Do not include electric ranges, clothes dryers, space-heating equipment, or air-conditioning equipment - NEC 220.53 excludes them, and each has its own demand method. The 75% demand factor applies only when four or more appliances are entered.

Voltage (for demand current)

How to use this calculator

  1. Add a row for each fastened-in-place appliance served by the feeder or service and enter its nameplate rating in VA (watts) - water heater, dishwasher, disposal, compactor, built-in microwave, attic fan, and the like.
  2. Leave out electric ranges, clothes dryers, space-heating equipment, and air-conditioning equipment - NEC 220.53 excludes them, and each has its own demand tool.
  3. Pick the line voltage for the informational demand-current readout (240 V is the usual dwelling service).
  4. Read the demand load in VA and kW. The tool shows whether the 75% factor applied (four or more appliances) or the load was taken at 100%, plus the connected load for comparison.

NEC reference

This tool implements NEC 2020 Section 220.53 (Appliance Load - Dwelling Unit(s)). Section 220.53 permits a 75% demand factor on the nameplate rating load of four or more appliances fastened in place - other than electric ranges, clothes dryers, space-heating equipment, or air-conditioning equipment - served by the same feeder or service in a one-family, two-family, or multifamily dwelling. Section 220.53 is identical in the 2017, 2020, and 2023 editions, so no edition toggle is offered.

Results are for reference only. Verify against the applicable adopted edition of the NEC and consult a licensed electrician for code compliance.

How the 220.53 appliance demand is figured

Total the nameplate ratings of the qualifying fastened-in-place appliances, count them, and apply the demand factor:

  • Four or more appliances: demand load = connected nameplate load × 75%.
  • One, two, or three appliances: demand load = connected nameplate load × 100% (the 75% factor is not permitted).

The demand factor recognizes diversity: a water heater, dishwasher, and disposal rarely draw their full nameplate at the same instant, so once four or more fixed appliances are on the feeder the code allows the group to be taken at 75%. This is the same treatment the whole-dwelling load calculators apply to the fixed-appliance line, taken out on its own here so the four-appliance gate and the exclusion list are explicit.

Worked example: four kitchen and utility appliances

A single-family dwelling has a 4500 VA water heater, a 1200 VA dishwasher, a 900 VA garbage disposal, and a 1000 VA trash compactor - four fastened-in-place appliances, none of them a range, dryer, heater, or air conditioner. The connected load is 4500 + 1200 + 900 + 1000 = 7600 VA. Because four appliances are present, NEC 220.53 permits the 75% demand factor, so the appliance demand load is 7600 × 0.75 = 5700 VA (5.7 kW), or 5700 / 240 = 23.8 A at 240 V. Drop the compactor and only three appliances remain: 6600 VA taken at 100% is a 6600 VA demand - larger than the four-appliance result, because the fourth appliance is what unlocks the 75% factor.

What counts, and what does not

NEC 220.53 applies to appliances fastened in place in a dwelling. Typical qualifying appliances include the water heater, dishwasher, garbage disposal, trash compactor, built-in microwave, and attic or whole-house fan. The four categories below are excluded from both the count and the load - each is calculated by its own method:

  • Electric ranges and cooking appliances - NEC Table 220.55 (see the Range / Cooktop Demand Load Calculator).
  • Electric clothes dryers - NEC 220.54 (see the Electric Dryer Demand Load Calculator).
  • Space-heating equipment - NEC 220.51 / Article 424.
  • Air-conditioning equipment - Article 440 (with the 220.60 noncoincident-load allowance against heat).

What this tool does not do

  • The rest of the service load. This is the fixed-appliance line only; add general lighting, the small-appliance and laundry circuits, cooking, dryer, HVAC, and the largest motor with the load calculators below.
  • Branch-circuit conductor and breaker sizing (NEC 210.19, 240.4, Table 310.16) - use the Wire Size and Breaker Size calculators.
  • The neutral conductor (NEC 220.61), which may be smaller than the ungrounded conductors.
  • Non-dwelling occupancies. 220.53 is a dwelling-unit rule; commercial receptacle and kitchen loads use 220.14, 220.44, and 220.56.

Frequently asked questions

Why does the 75% factor need four appliances?

NEC 220.53 permits the demand factor only where four or more fastened-in-place appliances share the feeder or service, on the reasoning that a larger group of fixed appliances is unlikely to run all at once. With three or fewer, the code requires the full 100% of nameplate.

Does the water heater count as a fixed appliance?

Yes. A storage water heater is fastened in place and is not a range, dryer, space heater, or air conditioner, so it counts toward the four-appliance total under 220.53. Size its own branch circuit as a continuous load with the Water Heater Branch Circuit Calculator.

Is this the same as a whole-house load calculation?

No. This computes only the NEC 220.53 fixed-appliance line. A full dwelling service calculation combines it with lighting, small-appliance and laundry circuits, cooking, the dryer, HVAC, and the largest motor. Use the Electrical Load Calculator (220.82 optional method) or the Residential Electrical Load Calculator (Article 220 standard method) for the complete service load.

Related calculators

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For deeper NEC training on dwelling load calculations and Article 220, Mike Holt's NEC courses are the industry standard.

Working from the printed code? NEC code books and tab sets are available from Mike Holt.

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