Electrical Safety: Grounding and Bonding

This video tutorial explains the differences between grounding, earthing, and bonding in electrical systems. Grounding connects live parts to the Earth to manage fault currents, while earthing connects metallic parts to prevent electric shocks. Bonding ensures all metallic parts are at the same potential to eliminate electric hazards. The video clarifies these concepts with examples and highlights their importance in ensuring safety in electrical systems.

What is the primary difference between grounding and bonding?

• Grounding is used in Europe, while bonding is used in the U.S.

• Grounding connects live parts to the Earth, while bonding connects metallic parts together.

• Grounding is for safety, while bonding is for efficiency.

• Grounding is a type of bonding.

In which countries is the term 'grounding' primarily used?

• UK and Europe

• U.S. and Canada

• India and China

• Australia and New Zealand

What color is typically used to denote a ground wire in electrical systems?

• Green

• Blue

• Red

• Black

What is the main purpose of earthing in electrical systems?

• To balance the electrical load

• To connect all metallic parts together

• To provide a path for fault currents

• To prevent electric shock by discharging fault currents to the ground

Which color is used to represent the earthing wire in electrical nomenclature?

• Yellow

• Red

• Green

• Black

What does bonding aim to achieve in an electrical work area?

• To connect live parts to the Earth

• To maintain all metallic parts at the same potential

• To increase the resistance of the system

• To provide a backup power source

What is the purpose of an Earth mat or ground mat in bonding?

• To connect live wires

• To provide insulation

• To increase voltage

• To ensure equipotential between equipment

What is 'step potential' in the context of electrical safety?

• The potential difference between two points on the ground

• The potential difference experienced by a person between their feet when stepping

• The potential difference between a person and a metallic object

• The potential difference across a live wire

How does bonding help in preventing electric shock?

• By providing an alternative current path

• By disconnecting the power supply

• By ensuring all metallic parts are at the same potential

• By increasing the resistance of the ground

What is 'touch potential' in electrical safety?

• The potential difference between two metallic objects

• The potential difference experienced by a person touching a metallic object

• The potential difference across a circuit breaker

• The potential difference between two live wires