NEC 210.21(B) · 210.23 · 2023 NEC

How to match receptacle ratings to the branch circuit

Single vs multiple receptacles, when a 15 A device can go on a 20 A circuit, range receptacles, and the 80% and 50% load limits in 210.23 — with worked examples and a free link to the official table.

Need the actual table? Look up Table 210.21(B)(3) and 210.23 in the free NFPA viewer →

How to pick the receptacle rating, step by step

Step	Question	Rule
1	Is it a single receptacle on an individual branch circuit?	Yes → its rating must be at least the circuit rating (210.21(B)(1)). A duplex is two receptacles, not one
2	Is it one of two or more receptacles on the circuit?	Yes → pick a rating the table allows for that circuit size (Table 210.21(B)(3))
3	What cord-and-plug load will it carry?	Keep it within the Table 210.21(B)(2) limits — effectively 80% of the receptacle rating
4	Is it a range receptacle?	210.21(B)(4) lets the rating be based on the single-range demand from Table 220.55
5	Does the circuit also feed lighting or fixed equipment?	Check the 210.23 limits for that circuit size

Our own summary of the 2023 NEC, not the code text. Look up 210.21(B), Table 210.21(B)(3), and 210.23 in the free NFPA viewer (nfpa.org/freeaccess) and verify against the NEC edition adopted by your AHJ.

What each branch-circuit size may supply (2023 210.23, paraphrased)

Circuit	2023 section	What it may supply	Key limit
10 A (new in 2023)	210.23(A)	Lighting outlets and a few specific dwelling loads such as bath/laundry exhaust fans	No receptacle outlets
15 A and 20 A	210.23(B)	Lighting, utilization equipment, or both	One cord-and-plug item ≤ 80% of circuit; fastened-in-place equipment ≤ 50% when lighting or plug loads share the circuit
30 A	210.23(C)	Heavy-duty lampholder lighting (non-dwelling) or utilization equipment	One cord-and-plug item ≤ 80% of circuit
40 A and 50 A	210.23(D)	Fastened-in-place cooking appliances in any occupancy; outside dwelling units also heavy-duty lighting, infrared heating, and other utilization equipment	Dwelling units: cooking appliances only
Over 50 A	210.23(E)	Non-lighting outlet loads only	—

2023 inserted 10 A circuits as 210.23(A), shifting the other letters down by one. Our own summary of the 2023 NEC, not the code text. Look up 210.21(B), Table 210.21(B)(3), and 210.23 in the free NFPA viewer (nfpa.org/freeaccess) and verify against the NEC edition adopted by your AHJ.

Worked example 1 — 20 A general-purpose circuit, office break room

Input / step	Value	Source
Circuit	20 A, three duplex receptacles	Design
Receptacle rating allowed	15 A or 20 A	Table 210.21(B)(3)
Largest single cord-and-plug appliance allowed	20 × 80% = 16 A	210.23(B)(1)
Microwave nameplate	13 A — OK	Nameplate
Fastened-in-place under-cabinet water heater on same circuit	Must be ≤ 10 A (50%)	210.23(B)(2)

Worked example values only. The 13 A microwave plus a 1,800 W coffee maker (about 15 A) totals about 28 A and will trip this breaker — give the break room more than one circuit.

Worked example 2 — household range on a 40 A circuit

Input / step	Value	Source
Range nameplate	12 kW	Submittal
Branch-circuit demand	8 kW ÷ 240 V ≈ 33 A → 40 A circuit	Table 220.55, Column C
Receptacle rating allowed on a 40 A circuit	40 A or 50 A (a standard 50 A range receptacle works)	Table 210.21(B)(3), 210.21(B)(4)
Single receptacle on an individual circuit?	Yes — and it is not less than the circuit rating	210.21(B)(1)

Worked example values only. Look up the other rows of Table 210.21(B)(3) in the free NFPA viewer.

Common field mistakes

Mistake	What to do instead
Installing a 15 A simplex (single) receptacle on a 20 A dedicated circuit	A single receptacle on an individual circuit must be rated at least 20 A — or use a duplex
Thinking a 15 A duplex on a 20 A circuit is a violation	A duplex is two receptacles, and 15 A receptacles are permitted on 20 A multi-outlet circuits
Loading one plug-in appliance to the full breaker rating	Keep any single cord-and-plug item within 80% of the circuit
Putting a fixed water heater or disposal on a lighting/plug circuit at full size	Fastened-in-place equipment is capped at 50% when it shares the circuit
Putting a receptacle on a new 10 A lighting circuit	The 2023 10 A circuits cannot serve receptacle outlets

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The receptacle-rating questions inspectors actually write up

Look up Table 210.21(B)(3) in the free NFPA viewer. NFPA offers read-only access to current NEC editions at no cost. This page explains how the rules work; it does not reproduce the tables. Written to the 2023 NEC — verify against the edition your AHJ has adopted.

Single or multiple — that is the first question. A single receptacle is one contact device on its yoke; a duplex is two receptacles. When a single receptacle is the only thing on an individual branch circuit, 210.21(B)(1) requires it to be rated at least as high as the circuit. When two or more receptacles share the circuit, Table 210.21(B)(3) lists which ratings are allowed for each circuit size — which is why a 15 A duplex is fine on a 20 A kitchen circuit.

Then the load limits. 210.21(B)(2) caps the cord-and-plug load on a receptacle, and 210.23 caps what the circuit can serve: a single plug-in appliance is held to 80% of the circuit rating, and fastened-in-place equipment sharing a 15 A or 20 A circuit with lighting or plug loads is held to 50%. Range receptacles get their own allowance in 210.21(B)(4), tied to the Table 220.55 demand.

2023 change. 10 A branch circuits are now recognized for lighting and a short list of specific loads, and they cannot serve receptacles. They were inserted as 210.23(A), so the 15/20 A rules are now 210.23(B) and every letter after that moved down one — update your inspection checklists.

Pick the device configuration from the NEMA plug and receptacle chart, size the conductor with the NEC 310.16 ampacity chart and the breaker from the standard breaker sizes guide, figure range demand with the cooking appliance demand guide, and record it on the panel schedule template. For long home runs, check the voltage drop calculator.

FAQ

Can I put a 15 amp receptacle on a 20 amp circuit?+

Yes, where the circuit has two or more receptacles — Table 210.21(B)(3) allows 15 A or 20 A receptacles on a 20 A circuit, and a duplex counts as two. A single (simplex) receptacle on an individual 20 A branch circuit must be rated at least 20 A under 210.21(B)(1). Look up the table in the free NFPA viewer at nfpa.org/freeaccess.

How much can I plug into a 20 amp circuit?+

Under 210.23, any one cord-and-plug connected item that is not fastened in place may not exceed 80% of the branch-circuit rating — 16 A on a 20 A circuit. The total load may not exceed the circuit rating.

Can a 50 amp range receptacle go on a 40 amp circuit?+

Yes. Table 210.21(B)(3) allows a 40 A or 50 A receptacle on a 40 A circuit, and 210.21(B)(4) lets a range receptacle rating be based on the single-range demand load from Table 220.55.

What changed in the 2023 NEC?+

The 2023 NEC recognized 10 A branch circuits for lighting and a few specific loads, added as 210.23(A). That pushed the 15/20 A, 30 A, 40/50 A, and larger-than-50 A rules down one letter. 10 A circuits cannot supply receptacle outlets.

What is the 50 percent rule for fastened-in-place equipment?+

On a 15 A or 20 A branch circuit that also supplies lighting, cord-and-plug equipment, or both, the total rating of fastened-in-place utilization equipment (other than luminaires) may not exceed 50% of the circuit rating.

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