What a Texas candidate needs to know about 4-way switch wiring before test day

How the bank tests this

Our question bank holds 500 items and 140 of them sit in wiring methods and installations, which is the area the Texas journeyman knowledge portion fills with ten of its 56 scored items under the heading electrical wiring methods and materials. Nothing in those 140 asks you to name the screws on a four way. Three of them put switching placement in front of you, and two of them ask which article answers a wall switch at all.

That second pair is the one worth your evening. Both sit in the hardest of the four difficulty tiers we grade to, a tier holding 24 of the 140, and both exist because the 2026 edition moved the rules for a wall switch out of the article every older study guide names. Somebody who can wire a four way in the dark still loses those two items when the tab in the book sends them to Article 404.

The wiring earns its place here because the placement items assume it. A question asking for a wall switch at each floor level of a stairway is describing a three way pair, and adding a landing in the middle is what puts a four way in the travelers. The article split for switches and the general material in wiring methods both belong beside this page.

The article moved in 2026

For the 2026 edition Article 406 changed its title to Wiring Devices and gained a new Part III covering general use snap switches, dimmers and electronic control switches. The switch connection rules a four way lives under are at 406.30 now. Article 404 kept the heavier apparatus: the enclosed general use switch, the motor circuit, isolating, pullout and molded case switches, and the circuit breaker used as a switch.

The dividing line is the Article 100 definition of a wiring device, which reaches a device on a yoke and a device used with flexible cord or cable. Pivoting on the word snap gets the snap switch right and then fails on a dimmer, which goes by another name and lands in Article 406 anyway. 404.1(B) lists what Article 404 gives up and points at Article 406, so a tab on 404.1 puts that pointer where your hand already goes.

Where the four way sits

A four way sits in the travelers, in the middle of the run, between two three ways. The two three ways own the ends. Each carries a common screw, and that common takes the ungrounded supply at one end and hands the switched leg to the outlet at the other, so everything starting or finishing the run happens at those two devices.

The four way carries four screws in two pairs. One pair receives the two travelers arriving from the first three way, and the other pair sends two travelers on toward the second three way or toward the next four way in the chain. Operating it swaps which incoming traveler feeds which outgoing traveler, and that swap is the whole of its job, which is why it carries no common screw.

406.30(A) covers the wiring in a sentence worth reading in your own book. Three way and four way switches are wired so all switching happens only in the ungrounded circuit conductors, and where the run uses metal raceway or metal armored cable the wiring between switches and outlets complies with 300.22(A). The section caps the number of four ways nowhere, so one device gives you three control locations and two give you four. The worked diagrams and the toggle tables for every switch position live in the question set, where the arithmetic side of this network keeps its drawings.

The pairing decides the answer

Here's the distinction the whole subject turns on. The pairs belong to the device in your hand. Manufacturers arrange them differently on the yoke, so the screws that go together are marked on the strap or named in the instructions in the box, and taking the pairing from the geometry of the screws is how this goes wrong on a real job.

The check is mechanical and it takes a minute. Walk every combination of every switch in the run. Three locations give you eight positions, and each should move the light from wherever the other two happen to be sitting. A run that behaves in seven positions and sulks in the eighth has a crossed pair in it, and the pattern of failing positions names the device to open first.

Where the switching is required

The reason a four way appears in a dwelling at all is 210.70, and that section is where the bank actually tests you. It asks for a wall switch controlled lighting outlet in every habitable room and bathroom, and a receptacle controlled by a wall switch may stand in for the outlet in habitable rooms other than kitchens and bathrooms. One bank item offers closets and a switch at every doorway among its options, both built by widening a rule that counts rooms.

The stairway subsection is what produces three way and four way work. Where a stairway between two floor levels has six or more risers, a wall switch goes at each floor level and at each landing level that includes an entryway. A bank item on an eight riser stair offers a single switch at the top, a single switch at whichever level gets used more, and a sensor in place of the switching. The sensor option is the most attractive of those, and automatic control is permitted on top of the required switching.

The same section reaches attics, underfloor spaces, utility rooms and basements holding equipment that needs service, and it puts the switch at the usual point of entry. A furnace in an attic reached by a pull down ladder gets a lighting outlet at the equipment with the switch at the entry. A bank item offers the servicing receptacle required near heating and air conditioning equipment as the answer to the attic question, and that receptacle is a separate requirement in the same article.

The neutral at the switch box

406.30(C) treats a four way location exactly as it treats a three way one, because it's written about locations and about what the switches control. Where switches control lighting loads on a grounded general purpose branch circuit serving a bathroom, a hallway, a stairway, or a habitable room or occupiable space as the building code defines it, the grounded conductor of the controlled lighting circuit is required at the switch location.

Read the allowance twice, because three locations change its shape. Where several switch locations control the same lighting load and the whole floor area of the room is visible from those locations taken together, one of them carries the grounded conductor. The test is about what the locations see between them, so a candidate who reads it as a count of switches will answer a stairway item wrong. Four conditions remove the requirement altogether:

• A raceway enters the box and it is large enough for all the conductors including a grounded one.
• The snap switch has the kind of integral enclosure 300.17(E) covers.
• The lighting is controlled from a remote location.
• The switch controls a receptacle load.

An exception covers replacement and retrofit switches. Grounding the device is 406.40(B), which also covers how a metal faceplate reaches the equipment grounding conductor, and 406.44 handles the enclosure, including the rule that a nonmetallic box for a switch uses a wiring method providing an equipment grounding conductor.

Travelers and white conductors

200.8(A) reserves a continuous white or gray covering, three white or gray stripes, or a white or gray marking at the termination for the grounded circuit conductor, and 200.8(B) and 200.8(C) carry the permissions going the other way.

200.8(C)(1)(a) is the one a switch loop needs. It permits a conductor in a cable assembly to be permanently re-identified for use as an ungrounded conductor under 310.6(A)(3), and it carries the marking itself: tape, paint or other effective means, applied at the termination and everywhere else the conductor is visible and accessible, encircling the insulation, in a color other than white, gray or green.

200.8(C)(1)(b) sets the limit. In a single pole, three way or four way switch loop, a re-identified conductor serves as the supply to the switch, and the return from the switch back to the outlet uses a different conductor. A traveler supplies the switch beyond it, so a re-identified white passes through a four way legitimately. 310.6(A)(3) requires ungrounded conductors to be finished so they are clearly distinguishable, while the marking method itself sits in 200.8(C)(1)(a), a split worth knowing before you go hunting under a clock.

What to do before test day

The journeyman knowledge portion gives you 130 minutes for 59 items, about 2.2 minutes each counting the three unscored pretest items you have no way to pick out. Reading a correct looking article that will never hold your answer spends most of that minute and a half, and Article 404 is the clearest example of it in the 2026 book.

Four tabs cover this subject. PSI allows only tabs the publisher of the code book manufactured or provided, so buy them with the book:

• 404.1, where the pointer to Article 406 sits.
• Article 406 Part III, which holds 406.30, 406.40 and 406.44.
• Article 100 at the definition of a wiring device.
• 210.70, where the lighting outlet and stairway switching items are answered.

Mark the book beforehand. Highlighting, underlining and notes written in before the session are fine, and writing in it during the session gets refused. A retake costs $78 whether you lost one portion or both, and the knowledge portion passed 24.46 percent of the 5,731 candidates who sat it in fiscal year 2025, so two items resting on an article move carry more weight than they appear to.

Questions people ask

Does a 4-way switch have a common screw?

It carries four screws in two pairs and no common. The common belongs to a three way, where it takes the odd conductor at each end of the run: the ungrounded supply at one end and the switched leg at the other. A four way sits between those two devices in the travelers, and nothing starts or finishes at that position, so there's no odd conductor for a common screw to receive. Anything that looks like a common on a four way is a misread of the strap, and the pairing is marked on the device or given in the instructions that came with it.

How many 4-way switches can one run take?

As many as the job needs. One four way gives three control locations, two give four, and 406.30 sets no ceiling on the count. The reason is that each device only reverses the traveler pair passing through it, so an even number of reversals hands the pair to the far three way as it started and an odd number hands it over swapped. Either way the two three ways at the ends decide what's connected to what. The travelers stay a matched pair through the whole chain, however many four ways they pass on the journey.

Which article answers a wall switch in the 2026 edition?

Article 406, which the 2026 edition retitled Wiring Devices and gave a new Part III holding general use snap switches, dimmers and electronic control switches. Article 404 kept the enclosed general use switch, the motor circuit switch, the isolating switch, the pullout switch, the molded case switch, and the circuit breaker used as a switch. The boundary is the Article 100 definition of a wiring device, which turns on a yoke or on use with flexible cord. Two of the 140 items in our wiring area test exactly this split, and both sit in the hardest difficulty tier.

Does a 4-way switch box need the grounded conductor?

406.30(C) is written about the location and about what the switches control, so a four way location is treated the same way as a three way one. Where the switches control lighting loads on a grounded general purpose branch circuit serving a bathroom, hallway, stairway, or habitable room or occupiable space as the building code defines it, the grounded conductor is required at the switch location. An allowance applies where several locations control the same load and the whole floor area is visible from those locations taken together, in which case one of them carries it, and four listed conditions remove the requirement.

Can a white conductor be a traveler through a 4-way?

Yes, where it's permanently re-identified. 200.8(C)(1)(a) permits a conductor in a cable assembly to serve as an ungrounded conductor under 310.6(A)(3), and it sets the marking: tape, paint or other effective means encircling the insulation, in a color other than white, gray or green, at the termination and everywhere else the conductor is visible and accessible. 200.8(C)(1)(b) limits a re-identified conductor in a single pole, three way or four way switch loop to the supply to the switch, and a traveler supplies the switch beyond it, which satisfies that limit.

Does the Texas exam ask about 4-way wiring directly?

Our 500 item bank carries no item asking you to identify the screws on a four way. What it carries instead is three items on where switching is required under 210.70, including a stairway item that produces exactly this circuit, and two items on which article answers a wall switch after the 2026 move. Read that as a steer on where to spend the evening. Knowing the device is the cheap part, and knowing the section that puts a wall switch at each floor level of a six riser stair is where the scored items sit.