What protective measures must be taken when stray or impressed currents are present?

When addressing the presence of stray or impressed currents, taking measures to prevent ignition is crucial for safety. Stray currents can occur in various environments, particularly in facilities dealing with flammable substances or gases like compressed natural gas. These currents may unintentionally energize conductive materials, creating potential ignition sources, especially if flammable vapors are present.

Implementing protective measures to prevent ignition includes ensuring that electrical equipment is properly grounded, using explosion-proof fixtures, and adhering to safe distance regulations for electrical installations. The focus on preventing ignition is essential in mitigating hazards associated with these currents, particularly in areas where leaks may occur or where there is a risk of flammable gas accumulation.

Other options, while aiming at electrical safety and preventing damage, do not directly address the concern of igniting flammable materials in the presence of stray currents. For example, removing all live wires and increasing the depth of wiring can be impractical or ineffective as standalone measures against ignition risks. Installing surge protectors might help with voltage spikes but does not adequately tackle the ignition issue involving stray currents. Thus, the emphasis on preventing ignition is the most relevant and critical action in such situations.