Home Inspector Exam Questions & Answers 2026 (1–10)

Question 1

What is the minimum clearance required between the service drop conductors and the roof surface over which they pass (where the roof pitch is less than 4 in 12)?

TheoryPractice · Accepted Answer

8 feet. NEC 230.24 requires at least 8 feet of clearance above a roof surface for service conductors where the pitch is less than 4/12. Steeper pitches allow a reduced 3-foot clearance.

Question 2

The weatherhead (service entrance head) for overhead service conductors must be located at or above which point relative to the service equipment?

TheoryPractice · Accepted Answer

Above the service-entrance cable connection to the service drop. The weatherhead must be positioned at the top of the service entrance so that the drip loop directs water away and the conductors enter from above, preventing water infiltration.

Question 3

A residential service entrance conductor must maintain a minimum clearance above a public sidewalk or walkway of:

TheoryPractice · Accepted Answer

10 feet. NEC 230.24(B) requires service conductors to maintain at least 10 feet of clearance above walkways accessible only to pedestrians, ensuring pedestrian safety beneath the wires.

Question 4

When inspecting a service entrance, a home inspector finds that the service entrance cable is stapled directly to the wood framing inside the wall cavity without protection. This is a concern because:

TheoryPractice · Accepted Answer

Physical damage to the cable could cause a fire or shock hazard. Service entrance cable in accessible locations must be protected from physical damage. Unprotected cable is subject to nail punctures and abrasion, which can compromise the insulation and create hazards.

Question 5

A 200-amp residential service requires copper service entrance conductors of at least which AWG size?

TheoryPractice · Accepted Answer

2/0 AWG. NEC Table 310.12 permits 2/0 AWG copper conductors for a 200-amp residential service. Aluminum would require 4/0 AWG for the same rating, reflecting aluminum's lower conductivity.

Question 6

What is the primary purpose of a grounding electrode system at a residence?

TheoryPractice · Accepted Answer

To limit voltage imposed on the system from lightning and utility line surges. The grounding electrode system connects the electrical system to earth to stabilize system voltage and provide a path to dissipate lightning and utility surge energy, protecting equipment and occupants.

Question 7

Which of the following is a recognized grounding electrode under the NEC?

TheoryPractice · Accepted Answer

A concrete-encased electrode (Ufer ground). A concrete-encased electrode (Ufer ground) — 20 feet or more of rebar in a concrete foundation — is a recognized NEC grounding electrode. Aluminum rods are not permitted, and plastic pipe is not conductive.

Question 8

Bonding of metal gas piping to the electrical system is required because:

TheoryPractice · Accepted Answer

It prevents dangerous voltage differences that could ignite gas. Metal gas piping that is not bonded to the electrical system can accumulate a voltage potential. Bonding equalizes potential and prevents arcing near gas piping, which could ignite leaking gas.

Question 9

A ground rod used as a grounding electrode must be driven to a minimum depth of:

TheoryPractice · Accepted Answer

8 feet. NEC 250.52(A)(5) requires driven ground rods to be installed to a minimum depth of 8 feet to ensure adequate soil contact and effective grounding.

Question 10

At a service panel, the neutral bar and the equipment grounding bar must be bonded together. In a subpanel fed from the main panel, this bonding strap should be:

TheoryPractice · Accepted Answer

Removed so that neutrals and grounds remain separate. In a subpanel (remote distribution panel), the neutral must be kept isolated from the equipment grounding conductors. The main panel is the only place where the neutral-to-ground bond is made, preventing parallel neutral current paths through the grounding system.

Home Inspector Exam Questions & Answers 2026 (1–10)

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