Electrician's Licensing Practice Exam

Which of the following statements is true regarding grounding methods?

1. Gas pipes can never be grounded

2. Grounding must always be separate

3. Grounding gas pipes to water pipes is allowed under specific conditions

4. Grounding is optional for gas pipes

The correct answer is: Grounding gas pipes to water pipes is allowed under specific conditions

The statement that grounding gas pipes to water pipes is allowed under specific conditions is considered true as it recognizes the practicalities associated with grounding methods in electrical work. Grounding is vital for safety, reducing the risk of electrical shock and ensuring that fault currents have a path to the ground. In specific conditions, it is permissible to bond gas pipes to water pipes to achieve a common grounding point, as long as it is part of an overall grounding system that complies with established codes and standards, such as the National Electrical Code (NEC). This bonding helps to ensure that both systems are at the same electrical potential, preventing sparking and other hazardous conditions. The other statements are not accurate in the broader context of grounding methods. For example, the assertion that gas pipes can never be grounded does not take into account safe bonding practices that may apply under regulated conditions. Additionally, the idea that grounding must always be separate is too rigid, as certain applications allow for proper interconnections. Lastly, stating that grounding is optional for gas pipes overlooks the critical safety standards that emphasize the importance of bonding and grounding in minimizing the risk of electrical hazards.