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2026 Statistics

Key Facts: NM CID ER-1 Exam

75%

Passing Score

PSI NM Contractor Bulletin 4/3/2026

80 Q

Official Exam Questions

PSI NM Contractor Bulletin 4/3/2026

180 min

Time Allowed

PSI NM Contractor Bulletin 4/3/2026

USD 107.63

PSI Exam Fee

PSI NM Contractor Bulletin 4/3/2026

NM CID ER-1 is an 80-question PSI residential electrical wiring exam, 75% pass, 180 minutes, USD 107.63 (bulletin 4/3/2026).

Sample NM CID ER-1 Practice Questions

Try these sample questions to test your NM CID ER-1 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to NEC Article 100, a device is a unit of an electrical system that is intended to:

A.Utilize electrical energy, such as a luminaire or appliance

B.Carry or control electric energy but not utilize it

C.Convert electrical energy to mechanical energy only

D.Protect conductors from overcurrent exclusively

Explanation: NEC Article 100 defines a device as a unit of an electrical system, other than a conductor, that carries or controls electric energy as its principal function. Switches, receptacles, and circuit breakers are devices; they do not utilize energy the way luminaires or appliances do. Utilization equipment is defined separately as equipment that uses electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes.

2In NEC 2020, the word “shall” identifies a rule that is:

A.Advisory commentary only

B.Permissive and optional

C.Mandatory

D.Limited to Informational Notes

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 and are not enforceable requirements.

3For dwelling-unit panelboards operating at 150 volts to ground or less, NEC 110.26(A) generally requires a working space of not less than:

A.2 feet deep, 24 inches wide, and 6 feet high

B.3 feet deep, 30 inches wide, and 6½ feet high

C.4 feet deep, 36 inches wide, and 7 feet high

D.3 feet deep, 36 inches wide, and 8 feet high

Explanation: NEC Table 110.26(A)(1) Condition 1 requires a 3-foot depth where exposed live parts are on one side and no live or grounded parts are on the other. 110.26(A)(2) requires a width of 30 inches or the width of the equipment, whichever is greater, and 110.26(A)(3) requires a height of 6½ feet or the height of the equipment, whichever is greater. These dimensions keep the workspace clear for operation and examination.

4Unless the equipment is listed and identified for use at 75°C, conductor ampacity at terminations rated 100 amperes or less is generally selected from which column of Table 310.16?

A.60°C column

B.75°C column

C.90°C column

D.110°C column

Explanation: NEC 110.14(C)(1)(a) requires that termination provisions for equipment rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, be used with conductors rated for the 60°C ampacity unless the equipment is listed and identified for use with 75°C conductors. The 90°C column may be used only for ampacity adjustment and correction, not for the termination rating unless the equipment is so identified.

5Listed or labeled equipment must be installed and used in accordance with:

A.Any field modification the installer prefers

B.Any instructions included in the listing or labeling

C.Manufacturer marketing literature only

D.Informational Notes in Article 90 only

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 are part of the listing and are enforceable. Field modifications that void the listing, or reliance on marketing copy instead of the listing instructions, do not satisfy 110.3(B).

6NEC 2020 210.8(A) requires GFCI protection for dwelling-unit receptacles in the listed locations when those receptacles are:

A.15-ampere, 125-volt only

B.125-volt through 250-volt, supplied by single-phase branch circuits rated 150 volts or less to ground

C.480-volt three-phase receptacles only

D.Lighting outlets only

Explanation: NEC 2020 expanded 210.8(A) beyond 125-volt, 15- and 20-ampere receptacles. It now covers all 125-volt through 250-volt receptacles in the listed dwelling locations when supplied by single-phase branch circuits rated 150 volts or less to ground. A 240-volt receptacle in a basement, garage, or laundry area can therefore require GFCI protection.

7All 125-volt through 250-volt receptacles installed in a dwelling-unit bathroom must have GFCI protection. The GFCI device itself must be:

A.Installed only in the attic

B.Readily accessible

C.Located outdoors

D.Omitted if the bathroom has a window

Explanation: NEC 210.8 requires the GFCI protective device to be installed in a readily accessible location so it can be tested and reset. Bathroom receptacles are listed in 210.8(A)(1). Hiding the GFCI in an attic, or omitting it because of a window, does not meet the rule.

8NEC 2020 210.8(F) requires GFCI protection for outdoor outlets at dwellings that are 150 volts to ground or less and 50 amperes or less. New Mexico’s electrical code adds which outdoor-outlet exception?

A.All outdoor lighting outlets are exempt

B.GFCI protection shall not be required for listed HVAC equipment

C.Any outdoor receptacle more than 3 feet above grade is exempt

D.Only 240-volt outdoor outlets require GFCI

Explanation: NEC 210.8(F) newly required GFCI protection for many outdoor dwelling outlets, which created practical problems for some HVAC equipment. NMAC 14.10.4.12(A)(1) adds Exception No. 2: GFCI protection shall not be required for listed HVAC equipment. Outdoor receptacles under 210.8(A)(3) still require GFCI unless another Code exception applies.

9NEC 2020 210.12(A) requires AFCI protection for 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices in dwelling-unit:

A.Bathrooms, garages, and outdoors only

B.Kitchens, family rooms, dining rooms, living rooms, bedrooms, closets, hallways, laundry areas, and similar rooms

C.Service-entrance conductors only

D.Pool pump motors only

Explanation: NEC 210.12(A) lists kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, and similar rooms or areas. Bathrooms, garages, and outdoor circuits are generally outside that AFCI list, though they often require GFCI. AFCI is a branch-circuit personnel/fire-protection requirement, not a service-conductor rule.

10In dwelling units, 15- and 20-ampere, 125- and 250-volt nonlocking receptacles are generally required to be:

A.Isolated-ground type

B.Tamper-resistant

C.Hospital-grade only

D.Twist-lock type

Explanation: NEC 406.12 requires listed tamper-resistant receptacles for 15- and 20-ampere, 125- and 250-volt nonlocking-type receptacles in dwelling units, including attached and detached garages and accessory buildings. The shutters reduce shock hazard from inserted objects. Isolated-ground, hospital-grade, and twist-lock devices are not the general dwelling rule.

About the NM CID ER-1 Exam

The New Mexico CID ER-1 examination covers residential electrical wiring. The official open-book PSI exam has 80 scored questions, a 75% passing standard (60 points), and 180 minutes allowed. Allowed references are NEC 2020 and New Mexico Electrical Code NMAC 14.10.4 (2020). Ugly's Electrical References and the American Electricians' Handbook are not allowed. PSI lists the fee at USD 107.63 (bulletin updated 4/3/2026). This English-language MCQ bank is a study aid, not an official PSI form.

Questions

80 scored questions

Time Limit

180 minutes

Passing Score

75% (60 of 80 points)

Exam Fee

USD 107.63 (PSI Services LLC (for New Mexico Construction Industries Division))

NM CID ER-1 Exam Content Outline

21%

General Knowledge and Electrical Installation Requirements

General residential electrical knowledge (17 items)

21%

Services, Feeders, and Branch Circuits

Dwelling services, feeders, and branch circuits (17 items)

Overcurrent Protection

Residential OCPD (4 items)

10%

Grounding and Bonding

Residential grounding and bonding (8 items)

11%

Conductors and Cables

Conductors and cables (9 items)

11%

Raceways and Boxes

Raceways and boxes (9 items)

Special Occupancies and Special Equipment, including Pools

Pools and special equipment (3 items)

Lighting and General-Use Equipment

Lighting and utilization equipment (3 items)

New Mexico State Code

NMAC 14.10.4 (6 items)

Low Voltage

Residential low voltage (4 items)

How to Pass the NM CID ER-1 Exam

What You Need to Know

Passing score: 75% (60 of 80 points)
Exam length: 80 questions
Time limit: 180 minutes
Exam fee: USD 107.63

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 ER-1 Study Tips from Top Performers

1ER-1 is heavier on general knowledge and services/feeders/branch circuits than the residential inspector exam

2Bring only NEC 2020 and NMAC 14.10.4; Ugly's is not allowed

3This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How much does the ER-1 exam cost?

PSI lists USD 107.63 for ER-1, which is higher than the USD 68.88 standard trade-exam fee (bulletin updated 4/3/2026).

100+ Free NM CID ER-1 Practice Questions

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Key Facts: NM CID ER-1 Exam

Sample NM CID ER-1 Practice Questions

About the NM CID ER-1 Exam

NM CID ER-1 Exam Content Outline

How to Pass the NM CID ER-1 Exam

What You Need to Know

Keys to Passing

NM CID ER-1 Study Tips from Top Performers

Frequently Asked Questions