For general-use receptacles in a home, the 2020 NEC does not set a fixed number on a 20-amp circuit based only on breaker size. For ordinary non-dwelling receptacles, the worked example below allows 13 receptacle yokes on a 120-volt, 20-amp circuit at 180 VA each. First identify the occupancy, voltage and loads in the question. “13 outlets” is not a rule for every circuit.
First, is it a dwelling?
Under 2020 NEC 220.14(J), qualifying dwelling general-use receptacles are included in the dwelling’s general lighting load calculation. You don’t add 180 VA for each ordinary dwelling receptacle.
That doesn’t mean you can connect unlimited loads. Circuit ratings, expected loads, required circuits and specific equipment rules still apply. Kitchens, bathrooms, laundry areas and garages have requirements that a general bedroom-circuit answer won’t cover.
Also distinguish an outlet from a receptacle. In NEC language, “outlet” is broader than the everyday wall-plug meaning. Read the question’s wording carefully.
Watch: the dwelling receptacle-spacing rule
JCR explains 2020 NEC 210.52(A)(1): no point along the floor line of qualifying wall space can be more than six feet from a receptacle. That commonly permits up to 12 feet between receptacles. Use the spacing rule to locate receptacles. Calculate the circuit load separately.
How the 12-foot rule for outlets works – NEC 210.52(A)(1)Watch JCR’s lesson on YouTube ↗
Why the non-dwelling answer is often 13
Section 220.14(I) generally assigns at least 180 volt-amperes to a single receptacle or multiple receptacles on one yoke, subject to its exceptions and related rules.
Assume a 120-volt, 20-amp branch circuit supplies only ordinary non-dwelling receptacle yokes, with no additional loads, no specified continuous load and no special rule changing the calculation:
- Circuit capacity: 120 V × 20 A = 2,400 VA.
- Calculated load per yoke: 180 VA.
- 2,400 ÷ 180 = 13.33.
- Use 13 whole yokes. Fourteen would calculate to 2,520 VA.
An ordinary duplex receptacle on one yoke counts as one 180-VA unit in this example. You don’t count its two plug openings as two separate 180-VA loads.
Learn which NEC rule answers the question
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See CE courses and class datesWhere does the “10 outlets” answer come from?
It often comes from multiplying 20 amps by 80% first, then dividing by 1.5 amps per yoke. That treats the entire calculated load as continuous.
The NEC’s ordinary continuous-load sizing rules generally require 125% of the continuous load plus 100% of the noncontinuous load. A continuous load is one expected to run at its maximum current for three hours or more. Don’t automatically classify every general-use receptacle load as continuous.
If a problem gives a continuous load, account for it. If it gives a different voltage or another connected load, recalculate. See our continuous-load and breaker example.
Outlet count isn’t the whole circuit design
Before applying the arithmetic to an installation, check:
- The actual load and whether equipment needs an individual circuit.
- The required number and purpose of dwelling circuits.
- Conductor ampacity, protection and applicable terminal limits.
- Receptacle spacing and location requirements.
- GFCI and AFCI protection.
- Local amendments and the adopted code edition.
Receptacle spacing and circuit capacity answer different questions. A living room may need several receptacles so a cord can reach one, while a single portable heater can draw much of a circuit’s available current. Count the required locations, then check the loads and circuit rules.
Common exam questions
Does a duplex receptacle count as one or two?
For the ordinary 180-VA calculation above, one yoke is one 180-VA unit. Special multiple-receptacle equipment has additional rules in 220.14(I).
Can I put 13 outlets on every 20-amp circuit?
No. Thirteen is the result of the stated non-dwelling example. It isn’t a universal dwelling rule or an installation design for every load.
Should I round 13.33 up?
No. Rounding up would exceed the available calculated capacity in this example.
Examples use the 2020 NEC. References checked October 25, 2026.
