Electrical Grounding and Its Types

Copper rods used for grounding should be a minimum of _______ feet long.

If the grounding rod is cannot be driven directly into the ground because of boulders/hard rocks, the NEC requires that it should be placed ___ in a trench at least 30" deep.

If two grounding rods are needed, they should be placed ____ feet apart.

All electrical appliances with a metal case/cabinet should have a grounding connection

• True

• False

The colour wire used for equipment grounding is _____

Which of the following is not true?

• Feeder demand factors are applicable to household electric ranges.

• A green colored conductor can be used as an ungrounded circuit conductor.

• Insulated conductors #6 or smaller shall be white or gray, no marking tape permitted.

• All joints or splices must be electrically and mechanically secure before soldering.

A general term including material, fittings, devices, appliances, fixtures, apparatus, and the like used as a part of, or in connection with, an electrical installation is __________.

• Premises wiring (system)

• Service Equipment

• Utilization equipment

• Equipment

Grounding is the connection of all parts of a wiring installation to the ________ or to other systems that are connected conductively to the earth.

Identify all the three qualities of a good grounding system.

• It must be able to dissipate high fault current repeatedly

• It must be of a low electrical resistance

• The material used must be of a high resistance

• It must be of a good corrosion resistance

• The material used must be flexible

The meaning of NEC is

• non-metallic earth conductors

• National electrical code

• North eastern code