Texas Electrician ExamTexas journeyman & master

Checked against primary sources 2026-08-24

The bonding grid at a pool is not there to clear a fault

Voltage is a difference between two points. The grid around a pool removes the difference instead of removing the voltage, and once you hold that idea the article stops looking like a list of distances.

On this page
  1. What is equipotential bonding at a swimming pool?
  2. Why the wrong answers are grounding answers
  3. What actually goes into the grid
  4. What the grid connects to, and what it does not
  5. Which ground-fault rules turn on distance and which do not
  6. Which part of the article you are standing in
  7. Why this is the cheapest point on the paper
  8. What to do with an hour
  9. What this page cites

What is equipotential bonding at a swimming pool?

It is the practice of tying every conductive thing a swimmer can reach into one connected mass, so that none of it can sit at a different voltage from the rest of it.

Shock needs a difference across the body. Not voltage in the abstract, a difference between the hand on the ladder rail and the foot on the wet deck. Equipotential bonding goes after the difference rather than after the voltage.

Tie the pool shell, the surface around it, the ladder, the handrails, the metal fittings, the circulating pump and the water together and they move as one. If something out on the utility system lifts that whole assembly a few volts above true earth, the swimmer bridging two parts of it still has nothing across the body, because both parts went up together.

Every grounding electrode present at a building has to be bonded together into one system The rule is not pick one. If a metal underground water pipe, a concrete encased electrode, a ground ring, a rod or pipe, or metal building frame is present at the structure, it is part of the system and must be bonded in. A rod is only permitted as a standalone electrode when none of the others exist. The grounding electrode conductor runs from the service to the system, and bonding jumpers tie the electrodes to each other. service GEC grade metal water pipe in contact 10 ft or more concrete encased electrode rod or pipe building steel all of them bonded together, not a menu to choose from a rod stands alone only when none of the others exist at the building
Present means required. The rod is what you use when nothing else is there, not a default. Drawn against NEC 250.50, 250.52(A) and 250.53. Sizing is Table 250.66, in your book.

Compare that with the figure above, which is the grounding electrode system at a building. Those conductors exist to give the premises a stable reference to earth and to give a surge somewhere to go. The pool grid looks similar and is doing something else, which is why so many candidates answer a bonding question with a grounding answer.

Why the wrong answers are grounding answers

Item writers know this confusion exists and they build distractors out of it. On an Article 680 bonding item, expect at least one choice that talks about clearing a fault, about opening an overcurrent device, or about running a bonding conductor out to a grounding electrode.

None of those describes what the grid is for. The equipotential bonding conductor is not sized to carry fault current and the article does not ask it to. Its whole job is done at a few volts, holding parts together, in a place where nothing has failed yet.

The clean version to carry into the room: the equipment grounding conductor answers the question what happens when something breaks. The bonding grid answers the question what happens when nothing breaks and the ground is still a few volts off.

What actually goes into the grid

The article names the parts one by one rather than stating a principle, so the list is the rule, and it is longer than most people expect. In outline it reaches:

That last one surprises people every time. The water is treated as one of the parts, which follows directly from the idea: if everything a swimmer touches is at one voltage but the water is not, you have reintroduced the difference you were trying to remove.

Read the list in your own copy of the NEC rather than from this outline. It has grown over several editions, and a version held in memory is usually two editions merged together.

What the grid connects to, and what it does not

No separate conductor runs from the grid back to the panel. NEC 680.26(B) is explicit about it: the bonding conductors are not required to be extended or attached to remote panelboard enclosures, to service equipment, or to electrodes.

The grid is not an island, though, and this is where the teaching usually goes wrong. Metal parts of the equipment that circulates and treats the water are bonded parts, and that same equipment is fed by a branch circuit with an equipment grounding conductor landed on it. The bonded network and the premises equipment grounding system meet there, at the pump, without anybody running a conductor to a distant electrode.

The article says so itself, in the one place where that meeting might not happen. Where a double-insulated pump motor is used, NEC 680.26(B)(6) has a solid 8 AWG copper conductor extended from the pool's bonding means to an accessible point near the motor, long enough to bond a future replacement, and if there is no connection between the pool's equipotential bonding means and the equipment grounding system for the premises, that conductor is connected to the equipment grounding conductor of the motor circuit.

So two things are true at once and an item can test either. Nothing is run out to a remote electrode to give the grid a reference to earth. Nothing leaves the grid floating at a potential of its own either, because a bonded network sitting at a different voltage from the equipment grounding system would put that difference across the first person to touch both.

Which ground-fault rules turn on distance and which do not

Both kinds are in this article, and reading them as one kind is how these items get lost.

The location rules are the ones everybody remembers. NEC 680.22(A)(4) is where the 20 foot figure lives, covering receptacles within 20 feet of the inside walls of a pool, and its heading names special purpose ground-fault circuit interrupters alongside the ordinary kind. NEC 680.22(B) governs how close a luminaire or a ceiling-suspended fan may sit, at 5 feet horizontally from the inside wall and 12 feet above the maximum water level. What has to be bonded is measured the same way.

Both of those sections carry qualifiers in the same sentence as the distance, about what kind of receptacle or luminaire and what kind of installation. Read the qualifiers before you use the number, because an item that changes one of them changes the answer while leaving the distance alone.

The equipment rules do not work that way at all. The general sections at the front of the article include a ground-fault section at NEC 680.5 that reaches across the whole article, and the permanently installed pool part carries pump motor rules at NEC 680.21 built around the motor and the circuit feeding it. The 2026 edition added NEC 680.21(D), covering a pool pump motor that gets replaced, reconditioned or repaired, which nobody sitting on a 2023 memory has read.

The two-step read that survives the stems

  1. Decide which part of the article the installation puts you in. That is the kind of water, not the kind of gear.
  2. Decide whether the rule you need is a location rule or an equipment rule. Only then look for a number.

Try it on four stems. A receptacle 14 feet from the inside wall of a permanently installed pool is a location rule, and 680.22 holds it. An outlet supplying a pool pump motor is an equipment rule, and the motor sections hold it wherever the motor sits. A luminaire 8 feet out and 7 feet above the water is a location rule again. A hydromassage bathtub in a bathroom is an equipment rule in a different part of the article altogether. Two of those four are answered by a distance, which is exactly why leading with the tape measure loses items.

Do not answer any of them from memory. Ground-fault requirements have moved in nearly every recent cycle, and this article moved again for 2026.

Which part of the article you are standing in

Article 680 is organized by the kind of installation rather than by the kind of equipment, with general sections at the front that reach all of it.

Permanently installed pools have the 680.20s. Storable pools start at NEC 680.30. Hydromassage bathtubs sit in the 680.70s, near the end. Spas and hot tubs, fountains, therapeutic pools and tubs, and electrically powered pool lifts each have a part of their own as well.

That structure is the single most useful thing to know about the article under a clock. Answering a spa question out of the permanently installed pool part is the most common way to lose one of these items, and it feels correct while you are doing it, because the paragraph you landed on is real and is about pools.

The definitions that decide it were rewritten for 2026

A storable pool and a permanently installed pool used to be separated by a water depth, and a lot of people carry that number around. It is gone. In the 2026 definitions a storable pool is described by being installed entirely on or above the ground and intended to be stored when not in use or moved, and a permanently installed pool by being built in the ground, partly in the ground, above ground, inside a building or on a building.

Those definitions live in Article 100 now, not in Article 680, which is another reason a candidate hunting the pool article for them comes up empty. Read both of them in the 2026 book before you decide which part of Article 680 a question is in.

One more trap lives in the split. A hydromassage bathtub sits in a bathroom and reads like a Chapter 2 question. It is not one, and the part that governs it is nowhere near the part that governs a pool.

Why this is the cheapest point on the paper

Special Occupancies, Equipment, and Conditions carries six of the fifty-six scored items on the journeyman knowledge portion, and three more on the calculations portion. That is nine scored items across the sitting, out of the same book everybody already owns.

The subject line on the blueprint is named after three chapters at once, which is worth a moment. Article 680 is in the middle one, Chapter 6, Special Equipment. Chapter 5 is Special Occupancies and holds different articles, so a candidate who goes hunting for swimming pools among the occupancies burns a minute finding that out. NEC 90.3 is the section that lays the arrangement out.

Almost nobody prepares for this material. It is nobody's day job unless it is specifically their day job, and every schedule that runs out of time runs out of it here. So the marginal point in this area is cheaper than a marginal point anywhere else on the paper, because the competition for it has already gone home.

You are not being asked to become a pool contractor. You are being asked to find a paragraph in a part of the book you have opened before.

What to do with an hour

  1. Open Article 680 at its parts list and read only the part titles. Five minutes, and it converts every future question into a two-step lookup.
  2. Read the equipotential bonding section end to end once, slowly, with the idea above in your head. It is short and it is the spine of the article.
  3. In that section, mark two things: the line saying the bonding conductors need not run to a panelboard, service equipment or an electrode, and the double-insulated pump motor paragraph that ties the grid to the equipment grounding conductor when nothing else does.
  4. Read the Article 100 definitions of a storable pool and a permanently installed pool in the 2026 book, even if you are sure you know them.
  5. Mark the ground-fault paragraphs in each part. Do not memorize the distances, just know which paragraph holds them.
  6. Work two or three items and notice what you reached for first. If it was a distance rather than a part title, that is the habit to break.

One housekeeping point for anyone sitting after the cutover. Texas adopts the 2026 National Electrical Code effective 1 September 2026, and the examinations are referenced to that edition from the same day, so the copy you tab has to be the 2026 book.

What this page cites

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