1) What is the main purpose of the earth cable? a) To power appliances b) To provide lighting c) To carry fault current safely to earth d) To reduce voltage 2) What is another name for the earth cable? a) Live conductor b) Neutral wire c) Protective conductor d) Return path 3) Why is equipotential bonding important a) It prevents overheating b) It reduces the risk of electric shock c) It increases current flow d) It balances water pressure 4) What does TN-S stand for? a) Tera Neutral – Shared b) Tera Neutral – Separate c) Terminal Neutral – Split d) Twin Neutral – Safe 5) In a TN-C-S system, where is the earth connected? a) To the water pipe b) To the outer sheath c) To the neutral at the supplier’s fuse d) To the consumer unit only 6) What does a TT system use for earthing? a) The neutral wire b) A transformer c) An earth rod d) A fuse 7) What does CSA stand for in cable sizing? a) Cable Safety Area b) Current Supply Allowance c) Cross Sectional Area d) Circuit Safety Application 8) What size earth wire is typically used for bonding gas and water pipes? a) 6mm² b) 8mm² c) 10mm² d) 12mm² 9) Where should bonding clamps be placed on a pipe? a) Anywhere along the pipe b) Within 600mm of the meter or stop valve c) At the highest point d) At the pipe joint 10) Which of the following must be equipotentially bonded? a) Plastic pipes b) Wooden floors c) Radiator pipes d) Light switches 11) What is the purpose of temporary continuity bonding? a) To test voltage b) To maintain earth continuity during work c) To increase resistance d) To reduce current 12) What must be done if paint is present on bonding points? a) Leave it as is b) Paint over the clamp c) Remove the paint for a good connection d) Use a plastic clamp 13) What is the main risk if earthing is not properly installed? a) Reduced water pressure b) Appliance malfunction c) Electric shock d) Overheating of pipes

Electrical Earthing Systems

Print
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?