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Exam Review

Key Facts: NM CID ES-10R Exam

75%

Passing Score

PSI NM Contractor Bulletin 4/3/2026

50 Q

Official Exam Questions

PSI NM Contractor Bulletin 4/3/2026

120 min

Time Allowed

PSI NM Contractor Bulletin 4/3/2026

USD 68.88

PSI Exam Fee

PSI NM Contractor Bulletin 4/3/2026

NM CID ES-10R is a 50-question PSI residential water well pump installer exam, 75% pass, 120 minutes, USD 68.88 (bulletin 4/3/2026).

Sample NM CID ES-10R Practice Questions

Try these sample questions to review concepts for the NM CID ES-10R exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under New Mexico CID classification ES-10R, residential water well pump work is limited to which electrical rating?
A.120/240 volts or less, single-phase, 15 horsepower or less
B.480 volts or less, three-phase, 25 horsepower or less
C.600 volts or less, single- or three-phase, with no horsepower limit
D.120 volts only, single-phase, 5 horsepower or less
Explanation: NMAC 14.6.6 limits the ES-10R residential water well pump installer classification to residential water well pumps rated 120/240 volts or less, single-phase, and 15 horsepower or less. The classification covers electrical equipment, wiring, and accessories directly associated with those residential pump systems. Three-phase, 480-volt, and larger-horsepower work belongs to ES-10 or an EE-98 license, not ES-10R.
2Which of the following is outside the ES-10R residential water well pump installer classification?
A.A single-phase variable-frequency drive serving a 5-horsepower dwelling well pump
B.Branch-circuit conductors from the dwelling panelboard to the well-pump location
C.A new 200-ampere electrical service for the dwelling
D.A 4 kW photovoltaic array dedicated only to the residential pumping equipment
Explanation: ES-10R includes pump equipment, single-phase VFDs, well-pit luminaires and receptacles, branch-circuit or feeder conductors from existing service equipment or a panelboard to the well, incidental trenching, and dedicated PV arrays of 5 kW or less. It expressly does not include electrical services, building wiring, systems over 240 volts, or pumps over 15 horsepower. Installing a new dwelling service requires a different electrical classification.
3For a 120/240-volt residential well-pump panelboard, NEC 110.26(A)(1) generally requires a minimum working-space depth in front of the equipment of:
A.24 inches
B.30 inches
C.36 inches
D.48 inches
Explanation: A 120/240-volt dwelling well-pump panel has 120 volts to ground, so Table 110.26(A)(1) uses the 0–150-volt row. That row requires 3 feet (36 inches) of working-space depth under Conditions 1, 2, and 3. Depth is measured from the exposed live parts or from the enclosure front if the live parts are enclosed.
4Per NEC Article 100, a well-pump disconnect is “in sight from” the controller only if it is visible and not more than how far away?
A.25 feet
B.100 feet
C.75 feet
D.50 feet
Explanation: Article 100 defines “in sight from” (within sight) as visible and not more than 15 m (50 ft) distant from the other equipment. Both conditions must be met. NEC 430.102 uses that definition for motor and controller disconnects, which is the usual rule at a residential well head or control box.
5Per NEC 110.3(B), listed well-pump control equipment shall be installed and used in accordance with:
A.The serving utility’s unwritten field practice only
B.Manufacturer advertising literature in place of the listing instructions
C.The installer’s preferred torque values even if they conflict with the listing
D.Any instructions included in the listing or labeling
Explanation: NEC 110.3(B) requires listed or labeled equipment to be installed and used in accordance with any instructions included in the listing or labeling. Those instructions become enforceable code. Torque values, enclosure type, conductor temperature rating, and controller sizing on the listing label control the installation.
6A receptacle installed in a residential well pit or well enclosure that is subject to weather is generally classified as being in a:
A.Dry location
B.Damp location only if it has a flap cover
C.Wet location
D.Class I, Division 1 hazardous location solely because water is present
Explanation: Article 100 defines a wet location as one in which water or other liquids may drip, splash, or flow on or against electrical equipment. An underground well pit or outdoor well enclosure is a wet location. Receptacles there need a wet-location listing, weather-resistant construction, and an extra-duty in-use cover per 406.9(B). Standing water alone does not make the pit a classified hazardous location.
7NEC 110.26(A)(2) requires the working space in front of a well-pump panelboard to be at least as wide as the equipment and not less than:
A.24 inches
B.42 inches
C.36 inches
D.30 inches
Explanation: Section 110.26(A)(2) requires the working-space width to be the width of the equipment or 30 inches, whichever is greater. The space must permit the enclosure door or hinged panel to open at least 90 degrees. Depth is a separate 110.26(A)(1) measurement and is usually 36 inches at 120/240 volts.
8Unless a New Mexico well-enclosure exception applies, NEC 110.26(A)(3) requires the working-space height in front of a panelboard to be at least:
A.5 feet
B.6 feet
C.6 feet 6 inches
D.8 feet
Explanation: NEC 110.26(A)(3) requires the work space to extend from the grade, floor, or platform to a height of 2.0 m (6½ ft) or the height of the equipment, whichever is greater. NMAC 14.10.4.11 adds a limited well-pit exception that can reduce headroom to more than 5 feet only when a removable lid restores 6½ feet. Absent that exception, 6 feet 6 inches is the minimum.
9A metallic well-pump disconnect mounted outdoors at grade, exposed to rain, must have an enclosure type suitable for a wet location. Which enclosure type is commonly accepted for that rainproof outdoor use?
A.Type 1
B.Type 4X only; Type 3R is never permitted outdoors
C.Type 12
D.Type 3R
Explanation: NEC 110.28 and Table 110.28 identify Type 3R as rainproof and suitable for outdoor use. Type 3R is the enclosure most often used on residential well-pump disconnects and control boxes at grade. Type 4 or 4X is also acceptable but is not required for ordinary rain exposure.
10Unless the equipment is listed and marked otherwise, NEC 110.14(C)(1)(a) requires conductor temperature ratings for circuits rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, to be selected from which column?
A.The 60°C column of Table 310.16
B.The 75°C column of Table 310.16
C.The 90°C column of Table 310.16
D.The 110°C column used for fixture wire
Explanation: NEC 110.14(C)(1)(a) requires termination provisions for equipment rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, to be used only for conductors rated 60°C unless the equipment is listed and identified for use with 75°C conductors. Many breakers and lugs are 75°C-rated, which then permits the 75°C column, but the default rule is 60°C. The 90°C column may be used only as the starting point for ampacity adjustment, not for the termination comparison unless the termination is so rated.

About the NM CID ES-10R Exam

The New Mexico CID ES-10R examination covers residential water well pump installer work. The official open-book PSI exam has 50 scored questions, a 75% passing standard (38 points), and 120 minutes allowed. Allowed references are NEC 2020, New Mexico Electrical Code NMAC 14.10.4 (2020), and IEEE electrical/electronics references listed in the bulletin. PSI lists the fee at USD 68.88 (bulletin updated 4/3/2026). This English-language MCQ bank is a study aid, not an official PSI form.

Exam sponsor: PSI Services LLC (for New Mexico Construction Industries Division). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

50 questions

Time Limit

120 minutes

Passing Score

75% (38 of 50 points)

Exam / Certification Fees

USD 68.88

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

18%

General Knowledge and Electrical Installation Requirements

General residential electrical installation (9 items)

10%

Feeders and Branch Circuits

Feeders and branch circuits (5 items)

6%

Overcurrent Protection

OCPD (3 items)

18%

Grounding and Bonding

Grounding and bonding (9 items)

10%

Conductors and Cables

Conductors and cables (5 items)

10%

Raceways and Boxes

Raceways and boxes (5 items)

6%

Panelboards and Switchboards

Panelboards (3 items)

10%

Motors, Pumps, and Controls

Residential pump motors and controls (5 items)

6%

Solar PV Systems

Solar PV related to residential pumps (3 items)

6%

New Mexico Electrical Code

NMAC 14.10.4 (3 items)

Preparing for the NM CID ES-10R Exam

What You Need to Know

  • Passing score: 75% (38 of 50 points)
  • Exam length: 50 questions
  • Time limit: 120 minutes
  • Exam / certification fees: USD 68.88 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NM CID ES-10R: Suggested Study Strategy

1Keep ES-10R residential: dwelling circuits, well casing bonding, and smaller pump motors
2This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How is ES-10R different from ES-10?

Both official PSI exams have 50 questions, 75%, and 120 minutes. ES-10R is the residential water well pump installer outline, with slightly more general-knowledge and grounding items and fewer panelboard items than ES-10.