If a cable contains metallic elements, what safety action must be performed?

If a cable contains metallic elements, what safety action must be performed?

• A. Grounding
• B. Insulating
• C. Testing
• D. Labeling

Answer: (A)

Grounding is essential when a cable has metallic elements because exposed metal can become energized if insulation fails or a fault occurs. Bonding those metal parts to earth creates a low-resistance path for fault currents, so any stray voltage on the metal is kept near earth potential and the protective device (like a breaker) trips quickly. This greatly reduces the risk of electric shock to anyone who might touch the cable. Insulating the metal helps prevent contact, but insulation can be damaged over time, and it doesn’t provide a reliable fault path if a conductor energizes the metal. Testing is important for verifying safety, but it doesn’t automatically protect during an fault condition. Labeling identifies hazards but doesn’t mitigate them either. Grounding directly addresses the danger by offering a safe discharge path for fault currents.

Grounding is essential when a cable has metallic elements because exposed metal can become energized if insulation fails or a fault occurs. Bonding those metal parts to earth creates a low-resistance path for fault currents, so any stray voltage on the metal is kept near earth potential and the protective device (like a breaker) trips quickly. This greatly reduces the risk of electric shock to anyone who might touch the cable.

Insulating the metal helps prevent contact, but insulation can be damaged over time, and it doesn’t provide a reliable fault path if a conductor energizes the metal. Testing is important for verifying safety, but it doesn’t automatically protect during an fault condition. Labeling identifies hazards but doesn’t mitigate them either. Grounding directly addresses the danger by offering a safe discharge path for fault currents.