Why is correct polarity testing important when completing a new installation?

• A. To ensure live and neutral are connected to the correct terminals and avoid miswiring that could cause shock or device damage.
• B. To balance loads across phases.
• C. To protect against overcurrent.
• D. To improve energy efficiency.

Answer: (A)

Polarity testing makes sure the live conductor is connected to the proper terminal and the return path is neutral. This keeps exposed parts from becoming live and ensures the protective devices interrupt the correct conductor when needed, reducing shock risk and preventing damage to equipment. If live and neutral are swapped, switches and outlets may not isolate power as intended, and some devices rely on correct polarity for safe operation. Other aims like balancing loads, providing overcurrent protection, or improving efficiency are handled by different parts of the system or by separate testing steps.