Checked against primary sources 2026-08-24

A patient care space is wired with two equipment grounding paths

The redundancy is what makes this area distinctive, and it is the thing an item writer reaches for first. One path is the metal. The other is a wire, insulated, copper, run with the circuit.

What makes wiring in a patient care space different?

Two equipment grounding paths instead of one. NEC 517.13(A) puts the branch circuit in a metal raceway system, or in a cable whose metallic armor or sheath assembly itself qualifies as an equipment grounding conductor under NEC 250.118. NEC 517.13(B) then adds an insulated copper equipment grounding conductor installed with those same branch circuit conductors.

Under the general rules one qualifying path is the whole requirement. Here the metal is one path and the wire is the other, and both are present in the same run.

That is the sentence to walk in with. An answer choice offering a metal raceway on its own, or an insulated conductor pulled through nonmetallic raceway, describes an installation that would be fine in an office and is not what this article describes.

One detail in the 2026 wording of 517.13(A) is worth a mark in the margin. The metal path takes in the metal boxes and fittings along the run, not only the raceway or cable between them.

Why a second path at all

Because in a patient care space the patient is sometimes part of the circuit, and the skin is not in the way.

Ordinary electrical safety leans hard on the resistance of dry skin. A catheter, a lead, a probe or an incision goes straight past it, and current that would be imperceptible through a hand can matter a great deal when it arrives near the heart through a saline-filled line.

So the design target changes. Elsewhere the question is whether the fault path will clear a fault before someone gets hurt. Here the question is whether a difference in voltage can appear at all between two metal surfaces near a patient who is already connected to one of them.

Redundancy answers that. A loose locknut, a corroded fitting or a raceway pulled apart during a renovation takes out one path and leaves the other. A single point of failure is an acceptable design in a warehouse. It is not one at a bedside.

The first path: not every metal sheath counts

The wording does real work. Not any metal raceway, and not any armored cable. The raceway system, or the cable armor or sheath assembly, has to qualify as an equipment grounding conductor in its own right.

That question is settled in Article 250, on the list at NEC 250.118 of what the code accepts as an equipment grounding conductor. Some metal-sheathed cable assemblies are on that list and some are not, and the distinction looks like a trick and is not.

The habit to build: when a question names a cable type in a hospital, you have two lookups. NEC 517.13(A) tells you the path has to qualify. NEC 250.118 tells you whether that assembly qualifies.

The second path: three words, all load-bearing

Insulated. Copper. Installed with the branch circuit conductors.

Insulated rules out a bare conductor. Copper rules out aluminum, which the code accepts in plenty of other places and does not accept here. Installed with the branch circuit conductors puts it in the same raceway or cable as the circuit it protects, rather than run separately by some other route.

Where it lands is worth reading too. NEC 517.13(B) takes it to the grounding terminals of receptacles other than isolated ground receptacles, and to exposed metal on fixed equipment that could become energized, that somebody could touch, and that operates at over 100 volts. That voltage qualifier sits on the equipment, not on the receptacles.

Each of those words has been the whole answer on an item. Read the sentence carefully once and you will recognize a stripped-down version of it in a distractor.

The section carries exceptions, and they turn on particular kinds of equipment and particular ways of making the connection. Mark where they sit and read them when one comes up rather than trying to hold them in your head.

Category, not room name

What a failure of equipment or a system would do is what sorts a space, and Article 100 is where the four definitions sit. They run from a failure likely to cause major injury or death, through one likely to cause minor injury, to one that can only cause discomfort, and finally to one with no physical impact on patient care. All four are extracted from NFPA 99.

Notice what the definitions do not say. They say nothing about power. Failure of equipment or a system is a great deal wider than the supply going away, and the injury in question can land on staff or a visitor as readily as on a patient.

The 2026 edition brings that framework into the NEC itself at 517.7, which puts the risk assessment on the facility's governing body and lets a designer build to a stricter category than the assessment calls for. NEC 517.7 does not ask for a documented assessment where Category 1 is chosen, since Category 1 is the strictest place to land.

NEC 517.10(B) is the other half of the move. It says what Part II does not reach at all, starting with spaces that are not intended for direct patient care.

So the first move on any Article 517 item is to decide what kind of space you are in before you read a single requirement. What the stem hands you is a room and an activity. What it is testing is the category.

Wet procedure locations offer you a choice

NEC 517.20(A) calls for special protection against electric shock in a wet procedure location by one of two means, and the alternative is the code's own, not a local practice. An isolated power system that stays in operation through a single line-to-ground fault, because it holds the first-fault current down to a low value. Or a supply that opens when ground-fault current exceeds the trip value of a Class A GFCI.

The words one of the following are in that section on purpose. They were added for the 2023 edition to stop the two means being read as a stack, and the 2026 edition keeps them. An item offering isolated power and GFCI protection together as the requirement is offering a distractor.

Isolated power carries requirements of its own. NEC 517.20(B) sends you to NEC 517.160 and asks for equipment listed as isolated power equipment, and NEC 517.160(B) calls for a listed, continually operating line isolation monitor on each system. That monitor is the point. It reports a first fault and lets the procedure finish, instead of opening the circuit under the surgeon's hands.

One 2026 addition is worth knowing. Where GFCI protection is the means chosen in an operating room, NEC 517.20(A) wants each receptacle to be an individual GFCI device or to be individually protected by its own GFCI device, so the protection is counted per receptacle rather than per circuit.

Wet procedure location is a defined term and Article 100 is where the definition sits. Read it before you answer anything in this part of the article. The everyday sense of a wet room is not the test.

Where this sits in the book, and why that matters in 2026

Article 517 is in Chapter 5, and NEC 90.3 is the rule that lets a Chapter 5 article demand something the general chapters never asked for. That rule widened for the 2026 edition. The specific chapters may now supplement or modify Chapter 8 as readily as they modify the general ones.

The chapter titles changed too, from special to specific. The published subject outline for the Texas exam still uses the older word and calls the area Special Occupancies, Equipment, and Conditions. Same subject, two vocabularies, and the book is the one you are searching.

Practical consequence for an open book exam. Anything in Chapter 5 can override what you already know, so the moment you identify one of these occupancies you stop reasoning from the general rules and go and read.

How much is this worth, and what to do about it

Six of the fifty-six scored items on the journeyman knowledge portion come from the special occupancy area, and health care is one of the handful of articles that area draws on. Nobody sits down to study hospitals for a journeyman exam, which is exactly the argument for spending an hour on it.

1. Read the definitions in Article 100, not at the front of Article 517. Patient care space, the four space categories, patient care vicinity and wet procedure location all live in Article 100, and they decide which rules reach the question.
2. Read NEC 517.13 in place, once, slowly. Both paths are in one short section.
3. Mark the exceptions under 517.13(B), and mark 517.20. Two tabs.
4. Learn two receptacle counts. NEC 517.18(B) sets a minimum of eight receptacles at a patient bed location in a Category 2 space, and NEC 517.19(B) sets a minimum of 14 at a patient bed location in a Category 1 space.
5. Learn the shape of the essential electrical system. NEC 517.29 describes a hospital's Type 1 system as three separate branches, the life safety branch, the critical branch and the equipment branch. On a journeyman paper you are unlikely to need more than that.

One date to keep straight. Texas adopts the 2026 National Electrical Code effective 1 September 2026 under 16 TAC 73.100, and the examinations move to that edition on the same day, so tab the 2026 book and not the one on the truck.

What this page cites

• NEC 517.13 The two paths. (A) puts the circuit in a metal raceway system or a cable whose armor or sheath assembly itself qualifies as an equipment grounding conductor under 250.118, and (B) adds an insulated copper equipment grounding conductor installed with the branch circuit conductors. Wording checked against the CMP-15 first and second draft output for the 2026 edition. source
• NEC 250.118 The list of what the code accepts as an equipment grounding conductor. It is what decides whether a given cable armor or sheath qualifies as the first of the two paths, and 517.13(A) points straight at it.
• NEC 517.20 Wet procedure locations. Special protection by one of two means, an isolated power system or a supply that opens above the trip value of a Class A GFCI. The phrase by one of the following was added in the 2023 cycle to show options rather than cumulative requirements, and the 2026 drafts keep it. (B) sends isolated power to 517.160 and asks for listed isolated power equipment. source
• NEC 517.160 Isolated power systems. (B) covers the listed, continually operating line isolation monitor that indicates total hazard current, which is the part that lets a first fault be reported instead of cleared.
• NEC 517.7 Patient care space risk categories and risk assessment. NEW for the 2026 edition, so it will not be in a 2023 book. Verified against the CMP-15 second draft output rather than a printed page, so confirm the section number in your own copy. source
• NEC 517.10 Applicability, and in (B) the list of what Part II does not reach. Worth reading first, because a space outside Part II never gets as far as the grounding rules.
• NEC 517.18 Category 2 spaces, including the minimum receptacle count at a patient bed location.
• NEC 517.19 Category 1 spaces, including the higher minimum receptacle count at a patient bed location.
• NEC 517.29 Essential electrical systems for hospitals. Describes the Type 1 system as three separate branches, life safety, critical and equipment. source
• NEC Article 100 Where the definitions live. Patient care space, the four space categories, patient care vicinity and wet procedure location are all defined here and not inside Article 517, which is a change readers of older books get wrong.
• NEC 90.3 How the chapters relate. Rewritten for the 2026 edition, and the reason a Chapter 5 article can demand something the general chapters do not.
• 16 TAC 73.100 Texas adoption of the 2026 National Electrical Code, effective 1 September 2026. source
• IAEI Magazine, Overview of Article 517 Background on how the article is organized and why patient care spaces are treated the way they are. Written against the 2020 edition, so check every number against your own book. source