Sign & Outline Lighting Outlet Requirement Calculator
Check the NEC 600.5 sign and outline lighting outlet rules for a commercial building: whether a sign outlet is required, how many, the dedicated branch circuit rating (at least 20 A, no other load), the 20 A or 30 A rating ceiling by illumination type, and the 1200 VA minimum computed load per required circuit under 220.14(F).
How to use this calculator
- Pick the occupancy. 600.5(A) applies to commercial buildings and commercial occupancies accessible to pedestrians; a dwelling or a service corridor is not covered.
- Enter the number of pedestrian-accessible entrances to tenant spaces. The tool returns one required sign outlet per entrance.
- Pick the illumination type to set the branch-circuit rating ceiling: 20 A for incandescent/fluorescent/LED, 30 A for neon.
- Pick the circuit voltage to see the continuous-load amperes per circuit.
- Read the result: whether an outlet is required, how many, the dedicated 20 A circuit rule, and the 1200 VA minimum load that each required circuit adds to a feeder or service calculation.
NEC reference
This calculator implements National Electrical Code (NEC) 2020 600.5(A) and 600.5(B) with 220.14(F). Section 600.5(A) requires each commercial building and each commercial occupancy accessible to pedestrians to be provided with at least one outlet in an accessible location at each entrance to each tenant space for sign or outline lighting system use, supplied by a branch circuit rated at least 20 amperes that supplies no other load; service hallways or corridors are not considered accessible to pedestrians. Section 600.5(B) caps the branch circuit rating at 20 amperes for incandescent and fluorescent signs and 30 amperes for neon tubing. Section 220.14(F) sets the minimum computed load at 1200 volt-amperes for each required sign branch circuit. NEC 2020 is the site default.
Results are for reference only. Verify against the applicable adopted edition of the NEC and consult a licensed electrician for code compliance.
What 600.5 requires, in order
Section 600.5 governs the branch circuit behind a sign, not the sign itself. The point is that every pedestrian-facing commercial storefront has a dedicated place to plug in a sign or outline lighting system, sized so it does not borrow capacity from another load. Four facts drive the requirement.
| Requirement | What it means | Source |
|---|---|---|
| Where it applies | Each commercial building and each commercial occupancy accessible to pedestrians; not dwellings or service corridors | 600.5(A) |
| How many outlets | At least one at each entrance to each tenant space | 600.5(A) |
| Dedicated circuit | A branch circuit rated at least 20 A that supplies no other load | 600.5(A) |
| Minimum load | 1200 VA per required sign circuit, taken at 125 percent as a continuous load | 220.14(F) |
Branch circuit rating by illumination type
The required outlet circuit is at least 20 A (600.5(A)). The ceiling depends on what the sign uses. For a non-neon sign the minimum and the ceiling meet at 20 A; a neon circuit may run up to 30 A.
| Illumination | Branch circuit rating | Source |
|---|---|---|
| Incandescent / fluorescent / LED (non-neon) | At least 20 A, not to exceed 20 A (exactly 20 A) | 600.5(A) + 600.5(B)(1) |
| Neon tubing | At least 20 A, not to exceed 30 A (20 A to 30 A) | 600.5(A) + 600.5(B)(2) |
The 1200 VA load, and where it goes
NEC 220.14(F) sets the minimum computed load for each required sign branch circuit at 1200 volt-amperes, or the actual connected load if it is larger. Because sign and outline lighting are continuous loads, the conductors and overcurrent device are sized at 125 percent of the load. That is 1200 VA times 1.25, or 1500 VA. At 120 V the continuous current is 12.5 A, comfortably inside a 20 A branch circuit. This tool reports the per-circuit figure and the total across all required outlets; to roll the 1200 VA into an Article 220 feeder or service calculation, use the Show Window and Sign Lighting Load Calculator.
Worked examples
A single retail store fronts a sidewalk with one customer entrance. 600.5(A) requires one sign outlet in an accessible location at that entrance, on a dedicated 20 A branch circuit that supplies no other load. If the sign is non-neon, the circuit is 20 A; the computed load is 1200 VA, or 1500 VA at 125 percent for sizing (12.5 A at 120 V).
A strip mall has four tenant storefronts, each with its own pedestrian entrance. That is four required sign outlets, one per tenant entrance, each on its own dedicated circuit. The minimum sign load added to the service calculation is 1200 VA times four, or 4800 VA. The rear service corridor shared by the tenants is not accessible to pedestrians, so it needs no sign outlet.
A storefront with a neon window sign still gets the required outlet, but the branch circuit for the neon tubing may be rated up to 30 A under 600.5(B)(2) rather than being capped at 20 A.
Common mistakes
- Sharing the circuit. The sign outlet circuit supplies no other load. A sign cannot share a circuit with receptacles or lighting.
- Counting a service corridor. A delivery or service hallway is not accessible to pedestrians, so it is not a qualifying entrance.
- One outlet for the whole building. The rule is one outlet at each entrance to each tenant space, not one per building.
- Using 1500 VA. The 1500 VA figure is from the 2008 and earlier editions. The current minimum is 1200 VA (220.14(F)).
- Skipping the outlet because there is no sign. The outlet and its dedicated circuit are required whether or not a sign is installed yet.
Frequently asked questions
When does the NEC require a sign outlet?
Under 600.5(A), for each commercial building and each commercial occupancy accessible to pedestrians, at each entrance to each tenant space. Dwellings and service corridors are not covered.
What size branch circuit does it need?
A dedicated branch circuit rated at least 20 A that supplies no other load. Non-neon signs are capped at 20 A, neon at 30 A (600.5(B)), so the required non-neon circuit is exactly 20 A and a neon circuit is 20 A to 30 A.
How much load do I calculate?
A minimum of 1200 VA per required circuit (220.14(F)), or the actual load if larger. As a continuous load it is taken at 125 percent, so 1500 VA for sizing, which is 12.5 A at 120 V.
How many outlets for a multi-tenant building?
One at each pedestrian entrance to each tenant space. Four tenant storefronts with their own entrances need four sign outlets, each on its own dedicated circuit.
Is the outlet required with no sign installed?
Yes. The outlet and its dedicated circuit are required at each qualifying entrance whether or not a sign is present, so a future tenant has a circuit to connect to.
Related calculators
- Show Window & Sign Lighting Load Calculator: fold the 1200 VA per sign circuit, plus 200 VA per foot of show window, into an Article 220 feeder or service load.
- Show Window Receptacle Outlet Calculator: count the show window receptacle outlets required under NEC 210.62 (one per 12 linear feet or major fraction).
- Breaker Size Calculator: size the overcurrent device for the dedicated sign circuit.
- Wire Size Calculator: size the conductor for the sign branch circuit from its continuous load.
- Continuous Load Calculator: apply the 125 percent continuous-load factor to any branch circuit or feeder load.
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