Swimming Pool & Spa Equipment Clearance Calculator

Pool and spa clearances at a glance

Every distance below is a fixed NEC 2020 value measured from the inside wall of the water (heights are measured above the maximum water level). Outdoor spas and hot tubs follow the pool column through 680.42; indoor spas and hot tubs use the 680.43 column.

The receptacle rule has both a floor and a ceiling: the required receptacle keeps a person 6 ft back from the water but must still be within reach, so it cannot sit past 20 ft (10 ft for an indoor spa). The luminaire rule trades height for distance, and the switch rule is a single 5 ft standoff.

The luminaire zones, in plain terms

NEC 680.22(B) treats a pool luminaire by how far it sits horizontally from the water. Within 5 ft, a new fixture has to be 12 ft above the maximum water level, high enough that no one in or beside the pool can reach it. Between 5 and 10 ft, the height requirement relaxes: the fixture needs GFCI protection unless it is at least 5 ft above the water and rigidly attached. Beyond 10 ft, 680.22(B) sets no pool-proximity clearance at all, though general wet-location and GFCI rules still apply. An existing luminaire already within 5 ft is not forced up to 12 ft; it may stay at 5 ft above the water if it is rigidly attached and GFCI protected. An indoor spa under 680.43(B) uses the 12 ft height, reducible to 7 ft 6 in when the fixture is GFCI protected.

Because 680.22(B)(1) reads "within 5 ft" and 680.22(B)(4) reads "5 ft to 10 ft," the two zones overlap at the 5 ft and 10 ft marks. This tool resolves those ties to the stricter rule, so a fixture at exactly 5 ft is held to the 12 ft height and one at exactly 10 ft still falls in the GFCI zone, never the more permissive reading.

Worked example: a backyard pool

A permanently installed pool needs its required convenience receptacle. Set 8 ft from the inside wall, it satisfies 680.22(A)(1), which puts the required receptacle at least 6 ft but not more than 20 ft from the water, GFCI protected and no more than 6 ft 6 in above grade. A pool-pump receptacle can sit closer at 6 ft, the minimum for any receptacle, and it too needs GFCI because it is within 20 ft.

A new post light 3 ft from the edge must be 12 ft above the water under 680.22(B)(1). If the same light is moved out to 7 ft, it falls in the 5 to 10 ft zone: at 6 ft above the water and rigidly attached it needs no GFCI, but drop it below 5 ft above the water and 680.22(B)(4) requires GFCI protection. The pool light switch must sit 5 ft back from the water per 680.22(C), unless a fence separates it from the pool.

Common mistakes

• Forgetting the receptacle maximum. The required receptacle has a ceiling as well as a floor: 20 ft for a pool, 10 ft for an indoor spa. A receptacle 30 ft away does not satisfy the required-receptacle rule.
• Using the pool 20 ft limit for an indoor spa. The indoor spa required receptacle maximum is 10 ft under 680.43(A), not 20 ft.
• Holding a new luminaire to 5 ft above the water. The 5 ft height is the existing-fixture allowance, and only with rigid attachment and GFCI. New work within 5 ft horizontally is 12 ft.
• Skipping GFCI in the 5 to 10 ft luminaire zone. A fixture there below 5 ft above the water must be GFCI protected.
• Confusing equipment clearance with overhead line clearance. Spans passing over the water are Table 680.9, a separate rule, not 680.22(B).

Frequently asked questions

How far does a receptacle have to be from a pool?

The required receptacle is 6 to 20 ft horizontally from the inside wall and no more than 6 ft 6 in high, GFCI protected, under 680.22(A)(1). Other receptacles are at least 6 ft away, and any within 20 ft must be GFCI protected.

How high does a pool light have to be?

A new luminaire within 5 ft horizontally of the water must be 12 ft above the maximum water level per 680.22(B)(1). Between 5 and 10 ft it needs GFCI unless it is at least 5 ft above the water and rigidly attached. An existing fixture within 5 ft may stay at 5 ft above the water if rigidly attached and GFCI protected.

How far from an indoor spa does a receptacle go?

At least 6 ft and not more than 10 ft from the inside wall of the spa under 680.43(A), and any 125 volt receptacle rated 30 amperes or less within 10 ft must be GFCI protected.

How far does a switch go from a pool?

At least 5 ft horizontally from the inside walls under 680.22(C), unless a barrier separates the switch from the water. The same rule applies to an indoor spa through 680.43.

Does this cover power lines over the pool?

No. Overhead conductor clearances over a pool are Table 680.9, a separate grid of distances, and are out of scope here. Use the Overhead Conductor Clearance Calculator for spans over the water.

Related calculators

• Overhead Conductor Clearance Calculator: the vertical clearance of an overhead span over the ground or a roof per NEC 230.24 and 225.18.
• GFCI Breaker Sizing Calculator: where GFCI protection is required and how to size the breaker.
• Working Space Clearance Calculator: the working space in front of electrical equipment per NEC 110.26(A).
• EV Charger Circuit Calculator: size the branch circuit and breaker for an EVSE per NEC Article 625.