NEC 220 Demand Factor Worksheet Chart

Use this worksheet after the calculator result to record appliance count, nameplate kW, load category, demand factor, adjusted demand, voltage basis, line current, and AHJ notes.

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Quick reference table

Use this calculator-led worksheet to record four 12 kW household ranges, the Table 220.55 basis, Column C demand, voltage basis, line current, adopted NEC edition, and AHJ notes before service, feeder, or utility review.

NEC 220 demand factor worksheet

NEC 220 demand factor worksheet
Item	Record from calculator	Follow-up
Appliance count	Actual count and table basis count	Confirm dwelling or multifamily context
Nameplate data	kW per appliance and connected load	Verify appliance nameplates
Demand result	Adjusted demand and demand factor	Keep table basis and notes together
Current and review	Voltage basis and line current	Route to service, utility, and AHJ review

NEC 220 demand-factor verification lanes

NEC 220 demand-factor verification lanes
Verification lane	Record on worksheet	Why it must be checked
Load category	Range, dryer, appliance, dwelling or multifamily note	Demand treatment depends on the exact load category
Nameplate basis	kW rating, count, appliance schedule	The calculator result is only as good as the appliance data
Demand path	Demand factor, table or method note, adjustment	Keep the adopted NEC verification path visible without copying tables
Service handoff	Feeder/service context, utility note, AHJ question	The result must be reviewed in the actual service-sizing context

Formula basis

Line current = adjusted demand kW x 1000 / voltage basis.

Appliance count is the household cooking equipment count entered in the calculator.
Nameplate kW is the appliance rating used for the demand screen.
Adjusted demand is the calculator result after the selected demand-factor path.
Voltage basis is the single-phase or three-phase voltage used for current conversion.

Worked examples

Dwelling range demand recordRecord four 12 kW ranges, table basis, connected load, adjusted demand, line-to-line voltage, line current, and AHJ follow-up before service sizing.

Multifamily appliance demand packageDocument dwelling count, appliance count, nameplate kW, load category, demand path, adjusted demand, feeder context, utility note, and AHJ question before final sizing.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

This worksheet documents a calculator screen and does not copy NEC tables or replace the adopted code text.
Demand-factor treatment depends on the adopted NEC edition, appliance type, dwelling context, voltage system, utility requirements, and AHJ interpretation.

Code and standard notes. Planning limits that should be checked before final equipment selection.

Use this chart as a calculation record; verify the adopted NEC Article 220 demand rules, appliance nameplate data, service or feeder context, utility requirements, local amendments, AHJ expectations, and qualified-person review before final sizing.

How to use this chart

1Record nameplate basisWrite appliance count, kW rating, connected load, and dwelling context.

2Keep demand path visibleDocument table basis, adjustment notes, adjusted demand, and demand factor.

3Route code reviewUse the worksheet to assign adopted NEC, utility, AHJ, and service-sizing follow-up.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Capture appliance inputsRecord appliance count, nameplate kW, voltage, and dwelling or multifamily note.
Capture demand resultWrite connected load, table basis, adjustment, adjusted demand, and line current.
Capture verificationList adopted NEC edition, utility requirement, AHJ note, and reviewer.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Using a demand-factor result without checking the adopted NEC edition and appliance nameplates.
Mixing service-load and branch-circuit decisions without documenting which result is being used.
Applying a demand factor without recording the load category, dwelling context, voltage basis, and AHJ verification item.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

Does this worksheet replace the NEC table?

No. It records the calculator result and the assumptions to verify against the adopted NEC edition and AHJ requirements.

Why record voltage basis?

The same demand kW produces different line-current values depending on the service or feeder voltage basis.