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100+ Free NM CID ES-10 Practice Questions

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2026 Statistics

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

Sample NM CID ES-10 Practice Questions

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

1A well-house strip heater connected to a 240-volt circuit measures 16 ohms. Using Ohm’s law, what is the current?
A.10 amperes
B.15 amperes
C.20 amperes
D.24 amperes
Explanation: Ohm’s law is I = E / R. Dividing 240 volts by 16 ohms gives 15 amperes. The ES-10 exam is open-book, but basic circuit math is still expected for heater, control, and pump-circuit checks.
2A 230-volt, single-phase well-pump motor draws its Table 430.248 full-load current of 8 amperes. What is the apparent power of that motor circuit?
A.920 volt-amperes
B.1,610 volt-amperes
C.1,840 volt-amperes
D.2,300 volt-amperes
Explanation: Single-phase apparent power is E × I. 230 volts × 8 amperes = 1,840 volt-amperes. Table 430.248 lists 8 amperes as the FLC of a 1-horsepower, 230-volt, single-phase motor, so this is the circuit VA used for load estimates before demand factors.
3Under NEC Article 100, a continuous load is a load where the maximum current is expected to continue for how long?
A.3 hours or more
B.1 hour or more
C.30 minutes or more
D.8 hours or more
Explanation: Article 100 defines a continuous load as a load where the maximum current is expected to continue for 3 hours or more. Many well-pump and well-house heater loads are treated as continuous when they can run that long, which drives the 125 percent conductor and OCPD factors in 210.19, 210.20, and 215.2.
4NEC Article 100 defines “in sight from” (within sight from) as visible and not more than what distance from the other equipment?
A.10 feet
B.25 feet
C.30 feet
D.50 feet
Explanation: Article 100 defines “in sight from” as visible and not more than 15 m (50 feet) distant. That definition is the yardstick for motor and controller disconnect location in 430.102. A buried submersible motor is not “in sight,” so the lockable-open exception is commonly used at well sites.
5A 120/240-volt well-house panelboard faces a wooden wall with no live or grounded parts opposite the enclosure. What minimum working-space depth does NEC Table 110.26(A)(1) require?
A.2 feet 6 inches
B.3 feet
C.3 feet 6 inches
D.4 feet
Explanation: A 120/240-volt panel is 120 volts to ground, so the 0–150-volt row of Table 110.26(A)(1) applies. That row requires 3 feet of depth under every condition. Depth is measured from the enclosure front or opening.
6Except as permitted by the exceptions in NEC 110.26(A)(3), what is the minimum headroom of working space about a well-house panelboard?
A.5 feet
B.6 feet 6 inches
C.7 feet
D.The height of the panelboard only
Explanation: NEC 110.26(A)(3) requires the work space to extend from the floor to 6 feet 6 inches or the height of the equipment, whichever is greater. New Mexico adds a limited well-enclosure exception in NMAC 14.10.4, but the baseline NEC headroom remains 6 feet 6 inches.
7A 480Y/277-volt well-field control panel faces a concrete wall. What minimum working-space depth does NEC Table 110.26(A)(1) require?
A.3 feet
B.3 feet 6 inches
C.4 feet
D.5 feet
Explanation: A 480Y/277-volt system is 277 volts to ground, so the 151–600-volt row applies. Concrete is a grounded surface, which is Condition 2. Condition 2 at 151–600 volts to ground requires 3 feet 6 inches of clear working space.
8NEC 110.9 requires equipment intended to interrupt current at fault levels to have an interrupting rating sufficient for which of the following?
A.The motor full-load current only
B.The panelboard bus rating only
C.The nominal circuit voltage and the current available at the line terminals of the equipment
D.The utility transformer nameplate kVA only
Explanation: NEC 110.9 requires the interrupting rating to be sufficient for the nominal circuit voltage and the current that is available at the line terminals of the equipment. A well-house breaker or fused disconnect must be able to clear the available fault current at that location, not merely the motor FLC.
9A listed submersible pump is supplied with installation instructions that specify a particular drop-cable type. What does NEC 110.3(B) require?
A.The pump shall be installed and used in accordance with the listing or labeling instructions
B.The installer may substitute any wet-location cable of equal ampacity
C.Listing instructions apply only when the AHJ writes them on the permit
D.Listing instructions apply only to the motor, not to the cable
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. For a submersible pump, that includes the manufacturer’s specified drop cable, splice kit, and control equipment.
10Under NEC 90.5, which word identifies a mandatory Code rule?
A.Should
B.May
C.Shall
D.Recommended
Explanation: NEC 90.5(A) states that mandatory rules identify actions that are specifically required or prohibited and use “shall” or “shall not.” Permissive rules use “shall be permitted” or “shall not be required.” Informational notes are explanatory, not enforceable.

About the NM CID ES-10 Exam

The New Mexico CID ES-10 examination covers 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.

Questions

50 scored questions

Time Limit

120 minutes

Passing Score

75% (38 of 50 points)

Exam Fee

USD 68.88 (PSI Services LLC (for New Mexico Construction Industries Division))

NM CID ES-10 Exam Content Outline

16%

General Knowledge and Electrical Installation Requirements

General electrical installation (8 items)

8%

Feeders and Branch Circuits

Feeders and branch circuits (4 items)

6%

Overcurrent Protection

OCPD (3 items)

16%

Grounding and Bonding

Grounding and bonding (8 items)

10%

Conductors and Cables

Conductors and cables (5 items)

10%

Raceways and Boxes

Raceways and boxes (5 items)

10%

Panelboards and Switchboards

Panelboards and switchboards (5 items)

12%

Motors, Pumps, and Controls

Pump motors and controls (6 items)

6%

Solar PV Systems

Solar PV related to pump systems (3 items)

6%

New Mexico Electrical Code

NMAC 14.10.4 (3 items)

How to Pass the NM CID ES-10 Exam

What You Need to Know

  • Passing score: 75% (38 of 50 points)
  • Exam length: 50 questions
  • Time limit: 120 minutes
  • Exam fee: USD 68.88

Keys to Passing

  • 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-10 Study Tips from Top Performers

1Drill pump-motor FLC, grounding, and well-casing bonding
2This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the NM ES-10 exam?

The official PSI examination has 50 scored questions. Passing is 75% (38 points) within 120 minutes (bulletin updated 4/3/2026).