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New Mexico MHD-3E Electrical Installer
Endorsement Exam QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES JUST RELEASED
New Mexico MHD-3E Electrical Installer Endorsement Exam
10 MOST-TESTED EXAM COVERAGE AREAS
1. MHD-3E Scope, Licensing & Endorsement Requirements — MHD-3E scope, electrical
endorsement requirements, permitted work, feeder assemblies, the 30-foot limit, experience
requirements, installer responsibilities, and MHD rules.
2. Manufactured Home Electrical Service & Feeder Systems — Service equipment, feeder
assemblies, on-site utility terminals, disconnects, feeder conductors, overcurrent protection,
equipment grounding, and connections to manufactured homes.
3. National Electrical Code Requirements — Electrical conductors, wiring methods, grounding,
bonding, overcurrent protection, disconnecting means, boxes, raceways, and other applicable
NEC requirements used for the examination.
4. Manufactured Home Construction & Safety Standards — Electrical provisions affecting
manufactured homes under 24 CFR Part 3280 and related federal requirements.
5. Manufactured Home Installation Standards — Electrical installation requirements under 24 CFR
Part 3285, including utility connections, installation practices, safety, and site connections.
6. Manufactured Home Installation Program Requirements — Requirements under 24 CFR Part
3286, including installer responsibilities, installation procedures, inspections, and compliance.
7. New Mexico MHD Rules & Regulations — NMAC 14.12 requirements, licensing, permits,
inspections, electrical work, installer responsibilities, violations, and compliance.
8. Electrical Safety, Grounding & Bonding — Grounding electrode systems, bonding, grounded
conductors, equipment grounding conductors, fault-current paths, and electrical shock
prevention.
9. Electrical Calculations & Installation Practices — Voltage, current, conductor sizing, ampacity,
voltage drop, load calculations, overcurrent protection, and practical feeder installation
decisions.
10. Inspection, Testing, Troubleshooting & Code Compliance — Inspection procedures, testing,
identifying unsafe conditions, correcting defects, documentation, permits, and proper
completion of electrical installations.
1.
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When an MHD-3E installer connects a feeder assembly to a manufactured home, what maximum length
applies to the feeder assembly?
A. 10 feet
B. 20 feet
C. 30 feet
D. 50 feet
Answer: C. 30 feet
Rationale: The MHD-3E endorsement extends the installer’s scope to feeder assemblies from the on-site
utility terminal to the manufactured home, not exceeding 30 feet. (NMRLD)
2.
Which New Mexico agency administers the Manufactured Housing Division requirements for MHD
installer and repairman licenses?
A. Department of Transportation
B. Regulation and Licensing Department
C. Department of Agriculture
D. Public Education Department
Answer: B. Regulation and Licensing Department
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Rationale: The Manufactured Housing Division operates within the New Mexico Regulation and
Licensing Department.
3.
What type of electrical work does the MHD-3E endorsement specifically add to the scope of an MHD-3
license?
A. Utility pole construction
B. Residential wiring for unrelated buildings
C. Feeder assembly installation to manufactured homes
D. Industrial motor installation
Answer: C. Feeder assembly installation to manufactured homes
Rationale: The E endorsement extends MHD-3 scope to feeder assemblies from the on-site utility
terminal to the manufactured home. (NMRLD)
4.
Before beginning electrical feeder work on a manufactured home, what should the installer verify first
regarding authorization?
A. The homeowner's paint color
B. The installer’s proper license and required endorsement
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C. The home’s appliance brand
D. The landscaping plan
Answer: B. The installer’s proper license and required endorsement
Rationale: Electrical work within the MHD-3E scope must be performed by an appropriately licensed
and endorsed installer.
5.
Which federal regulation is specifically listed by New Mexico MHD as a reference for manufactured
home construction and safety standards?
A. 24 CFR Part 3280
B. 12 CFR Part 1000
C. 29 CFR Part 1910 only
D. 49 CFR Part 300
Answer: A. 24 CFR Part 3280
Rationale: New Mexico MHD lists 24 CFR Part 3280 among the reference materials for its manufactured
housing examinations. (NMRLD)
6.
New Mexico MHD-3E Electrical Installer
Endorsement Exam QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES JUST RELEASED
New Mexico MHD-3E Electrical Installer Endorsement Exam
10 MOST-TESTED EXAM COVERAGE AREAS
1. MHD-3E Scope, Licensing & Endorsement Requirements — MHD-3E scope, electrical
endorsement requirements, permitted work, feeder assemblies, the 30-foot limit, experience
requirements, installer responsibilities, and MHD rules.
2. Manufactured Home Electrical Service & Feeder Systems — Service equipment, feeder
assemblies, on-site utility terminals, disconnects, feeder conductors, overcurrent protection,
equipment grounding, and connections to manufactured homes.
3. National Electrical Code Requirements — Electrical conductors, wiring methods, grounding,
bonding, overcurrent protection, disconnecting means, boxes, raceways, and other applicable
NEC requirements used for the examination.
4. Manufactured Home Construction & Safety Standards — Electrical provisions affecting
manufactured homes under 24 CFR Part 3280 and related federal requirements.
5. Manufactured Home Installation Standards — Electrical installation requirements under 24 CFR
Part 3285, including utility connections, installation practices, safety, and site connections.
6. Manufactured Home Installation Program Requirements — Requirements under 24 CFR Part
3286, including installer responsibilities, installation procedures, inspections, and compliance.
7. New Mexico MHD Rules & Regulations — NMAC 14.12 requirements, licensing, permits,
inspections, electrical work, installer responsibilities, violations, and compliance.
8. Electrical Safety, Grounding & Bonding — Grounding electrode systems, bonding, grounded
conductors, equipment grounding conductors, fault-current paths, and electrical shock
prevention.
9. Electrical Calculations & Installation Practices — Voltage, current, conductor sizing, ampacity,
voltage drop, load calculations, overcurrent protection, and practical feeder installation
decisions.
10. Inspection, Testing, Troubleshooting & Code Compliance — Inspection procedures, testing,
identifying unsafe conditions, correcting defects, documentation, permits, and proper
completion of electrical installations.
1.
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When an MHD-3E installer connects a feeder assembly to a manufactured home, what maximum length
applies to the feeder assembly?
A. 10 feet
B. 20 feet
C. 30 feet
D. 50 feet
Answer: C. 30 feet
Rationale: The MHD-3E endorsement extends the installer’s scope to feeder assemblies from the on-site
utility terminal to the manufactured home, not exceeding 30 feet. (NMRLD)
2.
Which New Mexico agency administers the Manufactured Housing Division requirements for MHD
installer and repairman licenses?
A. Department of Transportation
B. Regulation and Licensing Department
C. Department of Agriculture
D. Public Education Department
Answer: B. Regulation and Licensing Department
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Rationale: The Manufactured Housing Division operates within the New Mexico Regulation and
Licensing Department.
3.
What type of electrical work does the MHD-3E endorsement specifically add to the scope of an MHD-3
license?
A. Utility pole construction
B. Residential wiring for unrelated buildings
C. Feeder assembly installation to manufactured homes
D. Industrial motor installation
Answer: C. Feeder assembly installation to manufactured homes
Rationale: The E endorsement extends MHD-3 scope to feeder assemblies from the on-site utility
terminal to the manufactured home. (NMRLD)
4.
Before beginning electrical feeder work on a manufactured home, what should the installer verify first
regarding authorization?
A. The homeowner's paint color
B. The installer’s proper license and required endorsement
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C. The home’s appliance brand
D. The landscaping plan
Answer: B. The installer’s proper license and required endorsement
Rationale: Electrical work within the MHD-3E scope must be performed by an appropriately licensed
and endorsed installer.
5.
Which federal regulation is specifically listed by New Mexico MHD as a reference for manufactured
home construction and safety standards?
A. 24 CFR Part 3280
B. 12 CFR Part 1000
C. 29 CFR Part 1910 only
D. 49 CFR Part 300
Answer: A. 24 CFR Part 3280
Rationale: New Mexico MHD lists 24 CFR Part 3280 among the reference materials for its manufactured
housing examinations. (NMRLD)
6.
