System Earthing Types

What is the primary purpose of equipment earthing?

• To supply current to the device

• To prevent power loss

• To protect against electric shock

• To reduce electromagnetic interference

Which of the following is a classification of system earthing?

• TN-M

• TT

• TN-P

• TP-N

In which system does the consumer install their own earth electrode?

• TN-S

• TN-C

• TT

• IT

Which system is most commonly used for underground power supply to premises?

• TT

• TN-C-S

• TN-S

• IT

What is the combined neutral and earth conductor called in a TN-C-S system?

• PEC

• CPE

• PEN

• NPE

Which of the following systems separates the neutral and earth conductors throughout the installation?

• TN-S

• TN-C

• TN-C-S

• TT

What is one advantage of a TT system?

• Cheaper installation

• Less maintenance

• High immunity to frequency noise

• No need for RCD

Which component connects the consumer's terminal in a TN-S system to the supply transformer's neutral point?

• Phase conductor

• Live conductor

• Protective conductor (PE)

• PEN conductor

What is NOT a benefit of equipment earthing?

• Enhancing the looks of equipment

• Avoiding thermal distress

• Providing adequate current carrying capability

• Ensuring freedom from electric shock

System earthing helps to define:

• The length of cables

• The electrical potential relative to Earth

• The color of conductors

• The size of equipment