Lessons1-6

The practical safeguarding of persons and property from hazards arising from the use of electricity nest describes which of the following?

• The purpose of grounding

• The purpose of bonding

• The purpose of the NEC

• The objectives of the National Electrical Safety Code

Which of the following best defines the word ground?

• The earth

• A short in the electrical system

• A ground fault in the electrical system

• An unintentional connection to the earth

When an electrical system is grounded, one conductor of the system is intentionally connected to ground and is referred to by the NEC as the ___?___ conductor.

• equipment grounding conductor

• insulated

• grounded

• system bonding jumper

The ___?___ in an electrical circuit is the electromotive force of the circuit.

• Voltage

• resistance

• current

• watts

For current to be present in electrical circuits, the circuit has to be ____?____.

• connected to earth

• single-phase

• 3-phase

• complete

A(n) ____?_____ is defined as an unintentional, electrically-conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth.

• available fault current

• Ground fault

• conductor withstand rating

• short circuit

Which NEC table provides the minimum sizes for wire-type equipment conductors?

• Table 250.102(C)(1)

• 250.122

• Table 250.66

• Table 310.15(B)(16)

Which of the following can be thought of as the foundation of and electrical system?

• The grounding electrode system

• The electrical service equipment

• The equipment grounding conductor

• The grounding electrode conductor

Which of the following has the responsibility for approval of electrical installations and systems and interpreting NEC rules?

• The electrical contractor

• The engineer

• The apprentice

• The authority having jurisdiction (AHJ)

Permissive requirements in the NEC are characterize by which of the following words and terms?

• Shall be permitted

• Shall be required

• Shall not

• Shall not be permitted