Kitchen and laundry circuits: what they cost the service calculation, and how the exam asks

Two jobs in one room

A kitchen appears on the Texas exam in two entirely separate roles, and each one is answered from a different part of the book. Article 210 decides which circuits get installed and where the outlets go. Article 120 decides what those circuits contribute to a feeder or a service calculation.

That split is the whole difficulty. The same room, the same appliances and often the same numbers do different work depending on which question is being asked, and the only signal is the wording of the stem. A stem about a branch circuit is an installation question. A stem about a service, a feeder or a calculated load has moved into Article 120, where a demand factor can reach the same appliance.

The laundry is the same arrangement in miniature, and it carries an extra wrinkle that the bank tests directly: the calculation allowance follows the circuit that gets installed, so a dwelling with no laundry circuit has nothing to count. Hold those two jobs apart and most of the items in this area answer themselves. Run them together and the arithmetic is fine while the answer is wrong.

The allowance follows the circuit

120.52 is the section, and it puts 1,500 volt-amperes on each two wire small appliance branch circuit and on each two wire laundry branch circuit installed. The figure attaches to the circuit itself, so two small appliance circuits are two allowances and the dwelling total moves with the number of circuits run.

The bank builds an item on that wording, with 1,500 volt-amperes total as the wrong answer for a candidate reading the figure as a per dwelling allowance. A second wrong answer is 180 volt-amperes each, which is the minimum load per outlet that 120.14 assigns to a receptacle on one yoke in other occupancies, and a third is the connected load of the appliances, since a calculation of this kind never looks at what somebody plugs in.

Riding with the general lighting group

Those allowances are permitted to be included with the general lighting load and taken through the same demand brackets, which makes the order of operations worth memorizing. Add the floor area unit load, the small appliance allowances and the laundry allowance together first, then apply the demand factor once to the combined subtotal.

Doing it the other way around, by reducing the floor area load on its own and adding the allowances at full value, inflates the answer. The reason is arithmetic: the portion of those allowances that would have fallen above the first bracket loses the reduction it was entitled to. Both routes look reasonable on the page, which is why the bank asks about the order and keeps the figures easy.

One load that stays out of that group is the range. It has its own demand treatment under the cooking appliance rules, and carrying it into the lighting group would apply two demand factors to a single load. The bank tests this as a four option item where the range is the odd one out, and the demand factor page sets out which reduction owns which group of loads.

When cooking units count as one range

A note to the cooking appliance demand table permits one counter mounted cooking unit and up to two wall mounted ovens to be treated as a single range whose rating is the sum, where they are supplied from one branch circuit and located in the same room. A 6 kW cooktop with two 3 kW wall ovens becomes one 12 kW range.

Every condition in that sentence carries weight. Put an oven in another room, or run the units on separate branch circuits, and they are counted separately, which usually produces a larger answer. The bank offers "as three separate appliances of 6, 3 and 3 kW" as a wrong answer and flags the single branch circuit and the same room as the signals the item writer planted for you.

The other wrong answer on that item treats the group as appliances fastened in place taking the 75 percent factor. Cooking equipment is held out of 120.53 precisely because it has its own table, and reading a kitchen item quickly is how a range ends up in the appliance count. Counting is the first step of the appliance rule and it is worth doing slowly.

Counting the appliances that qualify

120.53 permits a 75 percent demand factor where four or more appliances fastened in place are served by the same feeder or service. Counting them is the part that gets missed, because four categories are held out of the count: electric ranges, clothes dryers, space heating equipment and air conditioning equipment. Each of those has a demand rule of its own elsewhere in the article.

So a dwelling with a dishwasher, a disposal, a water heater and a compactor, plus a range, a dryer and an air conditioner, has four that qualify. The 75 percent applies to the total of those four alone, and the other three are carried at their own values. The bank offers seven as the wrong answer for anybody who counted every appliance in the house.

Two practical points follow. Four appliances totaling 6,800 volt-amperes contribute 5,100, while three appliances contribute their full total, so adding a fourth appliance can bring the calculated total down. And an appliance that is cord and plug connected and portable falls outside the phrase fastened in place, so the count depends on how the thing is installed.

The cord rules under the counter

Kitchen items on the knowledge portion often skip the calculation and ask about the cord behind a built in appliance. Article 422 sets the conditions for cord and plug connection of a built in dishwasher, a waste disposer or a trash compactor, and it gives a length range for each one, measured from the face of the plug to the plane of the rear of the appliance.

The length range makes the rule make sense. A cord that is too short strains the terminals and one that is too long coils up behind a heat source, so the section states both ends. The receptacle also has to be reachable, which is what lets the plug serve as the disconnecting means. The bank offers "any cord that is listed for use with that appliance" as a wrong answer, and the comment on it is that this permission is made entirely of conditions.

A permanently connected appliance is a different question. Above 300 volt-amperes or one eighth horsepower, the person working on it needs a disconnect in sight or a device capable of being locked open, and a breaker two rooms away satisfies neither. The appliance and water heater page works through Part III of Article 422 and the occupancy conditions that hang off it.

What decides a kitchen item

Four rules in this area are decided by something other than the appliance, and each has its own family of wrong answers.

• Arc fault protection turns on location. Two 120 volt, 20 ampere circuits differing only in the room they serve are both inside the range the rule reaches, so the rating cannot separate them. The subsections are lists of rooms and areas, and a 240 volt or 30 ampere circuit in the same room sits outside the rule.
• A ground fault receptacle answers one hazard. It compares outgoing and returning current and opens on the difference, and the overcurrent protection stays with the breaker upstream. Ground fault breakers pack both functions into one device, which is what leads people to credit the receptacle with both jobs.
• The number of rooms on a circuit can settle a question. The allowance for other outlets on a bathroom receptacle circuit is written for a circuit serving one bathroom and nothing else, so a circuit reaching two bathrooms carries receptacle outlets only.
• Spacing is measured along the wall. Under the general rule no point along a wall line is more than six feet from a receptacle, so each one covers twelve feet of wall and a 14 foot uninterrupted wall takes two.

How the exam tests this

Six items in our 500 mention a laundry circuit and five mention the small appliance circuits, and all of those sit in the load calculation area, which holds 42 items in total. That is a narrow topic carrying real weight, because the allowances turn up inside larger dwelling calculations as well as in items of their own.

The forms are worth recognizing on sight. An item that names the number of circuits is testing the per circuit wording. An item that gives you a floor area load and two allowances is testing the order of the demand brackets. An item that describes a cooktop and two ovens in the same room on one branch circuit is testing the table note, and each carries a wrong answer shaped like the mistake.

On the job the calculation error arrives as equipment. Leaving allowances at full value buys a larger service than the dwelling can use, and the reverse error understates a multifamily service where house loads for corridor lighting, laundry rooms and elevators have been folded into the dwelling unit sum. Those house loads are worked separately and added after the unit demand factor, since the diversity was derived from dwelling units alone.

What to do before test day

This topic rewards a small amount of preparation because the sections are few and the wording is the whole of it.

• Read 120.52 word by word and underline "each" and "installed" before you sit. Those two words answer most of the items in this section of the book.
• Tab the cooking appliance table with the note visible, since the note is what an item about a cooktop and two ovens is built on.
• Write the four held out categories on the 120.53 tab. A range, a dryer, space heating and air conditioning are counted under their own rules and stay out of the four.
• Work one dwelling calculation with two small appliance circuits, a laundry circuit and a range, so the allowances arrive in the right place. The worked arithmetic in the question sets shows each step with its section, and the dwelling calculation page here gives the order the tracks run in.

One Texas point sits underneath all of it. The 2026 edition took effect here on 1 September 2026 under 16 TAC 73.100, so a book or a course built on the 2023 edition points at Article 220 for every section above. The edition page covers what that means for a job already permitted and for the four hours you owe at renewal.

Questions people ask

How much load does a small appliance branch circuit add to a dwelling calculation?

1,500 volt-amperes for each two wire small appliance branch circuit, under 120.52 in the 2026 edition. The figure attaches to each circuit, so a dwelling with the two required circuits carries 3,000 volt-amperes and a dwelling with three carries 4,500. The bank offers 1,500 as a total for candidates who read the figure as a per dwelling allowance, and it offers 180 volt-amperes per outlet, which is the minimum load per outlet that a different section assigns in other occupancies. The connected load of the appliances themselves never enters this calculation.

What if a dwelling has no laundry circuit?

Then the calculation carries nothing for laundry. 120.52 puts its allowance on each two wire laundry branch circuit installed, so the figure follows the circuit. Where a dwelling unit in a multifamily building has laundry facilities provided on the premises for all occupants, the receptacle requirement is excused, no laundry circuit is run and there is nothing to count. The bank offers 750 volt-amperes as a wrong answer for candidates looking for a half allowance, and no rule anywhere halves the figure. The same wording works in reverse for extra small appliance circuits.

Do the kitchen and laundry allowances take a demand factor?

Yes. 120.52 permits them to be included with the general lighting load, which means they are added to the floor area unit load first and the demand brackets are then applied once to the combined subtotal. Reducing the floor area load on its own and adding the allowances at full value afterward gives a larger answer and loses the reduction those allowances were entitled to. The range stays out of that group, since the cooking appliance rules give it a demand treatment of its own and running it through both would reduce one load twice.

When can a cooktop and two wall ovens be counted as one range?

When all three conditions in the table note hold: one counter mounted cooking unit and no more than two wall mounted ovens, supplied from a single branch circuit, and located in the same room. The combined rating is the sum, so a 6 kW cooktop with two 3 kW ovens is treated as one 12 kW range. Split them across branch circuits or put an oven in another room and they are counted separately, which usually produces a larger answer. The single circuit and the same room are the signals an item plants to tell you the note applies.

Which kitchen appliances count toward the four in 120.53?

Appliances fastened in place other than electric ranges, clothes dryers, space heating equipment and air conditioning equipment. A dishwasher, a disposal, a water heater and a compactor make four, so the 75 percent demand factor applies to the total of those four. The held out categories each have a demand rule elsewhere in the article, so counting them here would reduce a load that has already been reduced. Counting matters: three qualifying appliances earn nothing at all, which means adding a fourth appliance can lower the calculated total.

Does a kitchen receptacle circuit need arc fault protection?

The requirement turns on where the outlet is, and the subsections are written as lists of rooms and areas. Two 120 volt, 20 ampere circuits that differ only in the room they serve are both inside the range of circuits the rule reaches, so the rating cannot separate them, while a 240 volt or 30 ampere circuit in that same room falls outside the rule entirely. Read the location list in your own book on the day, since this is the kind of list an item is built from and it moves between editions.