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Grounding in Electrical Wiring Quiz

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Questions and Answers

What is the key factor for successful clearing of ground fault currents?

Insulation resistance

Grounding resistance

Electrical continuity (correct)

Voltage drop

Which of the following is NOT listed in NEC Section 250.92(A) as required items to be bonded together?

Grounding rods (correct)

Cable trays

Service cable armor or sheath

Service raceways

In ensuring continuity at service equipment, which of the following methods is permitted according to NEC Section 250.92(8)?

Connections utilizing threaded couplings or listed threaded hubs on enclosures if made up wrench-tight (correct)

Using random nuts and bolts for connections

Threadless couplings and connectors if not made up wrench-tight

Bonding equipment to the grounded service conductor utilizing tape

What is the purpose of the equipment grounding conductor in an electrical system?

To interconnect and bond the noncurrent-carrying metal parts of equipment to the system grounded conductor or grounding electrode conductor Signup and view all the answers

What is the recommended method for splicing wire-type grounding electrode conductors?

Using irreversible compression-type connectors Signup and view all the answers

When is it necessary to ground appliances like refrigerators, air conditioners, and washing machines?

When operating these appliances in wet or damp locations Signup and view all the answers

What type of receptacles must be used in residential, commercial, or industrial applications?

Grounding type Signup and view all the answers

When using metallic boxes, where should the equipment grounding conductors be attached?

To the grounding terminal on the receptacle Signup and view all the answers

In nonmetallic boxes with Type NM cable, where should the equipment grounding conductor be connected?

To the grounding terminal on the receptacle Signup and view all the answers

Which of the following is a permitted form for equipment grounding conductors as stated by NEC?

Liquid tight flexible metal conduit Signup and view all the answers