SEO Electrical Systems & Wiring 5

Question 1

What is the NEC requirement for receptacle placement along walls in a habitable room?

Accepted Answer

Every 6 feet so no point is more than 6 feet from an outlet

Answer

Every 12 feet measured along the wall

Answer

One receptacle per wall regardless of wall length

Answer

Every 8 feet with at least one per wall

Question 2

Which type of electrical fault occurs when a hot wire contacts a neutral wire directly, bypassing the load?

Accepted Answer

Short circuit

Answer

Ground fault

Answer

Arc fault

Answer

Open circuit

Question 3

What does the term 'service entrance' refer to in a residential electrical system?

Accepted Answer

The conductors and equipment that bring utility power from the meter to the main disconnect

Answer

The main panel breaker only

Answer

The grounding electrode system

Answer

The individual branch circuits leaving the panel

Question 4

What happens when a circuit breaker 'trips' due to an overload?

Accepted Answer

It opens the circuit to interrupt current flow, protecting the wiring from heat damage

Answer

It permanently burns out and must be replaced

Answer

It sends excess current to the ground wire

Answer

It reduces voltage on the circuit to a safe level

Question 5

What is the correct procedure for extending a circuit to add a new outlet?

Accepted Answer

Tap power from the nearest outlet box using properly sized wire and a new box

Answer

Connect directly to the panel neutral bar without a breaker

Answer

Run a new wire from the outlet back to the meter base

Answer

Use extension cords rated for permanent installation

Question 6

Which grounding electrode is considered the most effective for residential grounding systems per NEC?

Accepted Answer

A driven ground rod (8-foot copper-clad rod)

Answer

A water pipe connection only

Answer

A metal underground gas piping system

Answer

The building steel frame alone

Question 7

What does 'knob and tube' wiring lack that makes it potentially unsafe by modern standards?

Accepted Answer

A grounding conductor, limiting the ability to safely use modern grounded equipment

Answer

Sufficient wire gauge for today's loads

Answer

Conduit protection

Answer

Proper circuit breakers