When is it acceptable to use metallic tape measures?

Using metallic tape measures near energized equipment is considered unsafe due to the risk of electrical conductivity. Metallic materials can conduct electricity, which poses a significant hazard if they come into contact with live electrical components. This is particularly critical in environments where there is a risk of accidental contact with energized parts, as it could lead to electrical shocks or create arcs that can cause serious injuries or damage.

The other options do not adequately address the safety hazards associated with metallic tape measures in proximity to energized equipment. Using metallic tape measures in dry conditions, isolating the area, or having a safety officer present does not negate the inherent risks of working with conductive materials near electricity. Therefore, option B emphasizes the strict guideline against their use in such environments, highlighting the importance of adhering to safety standards to prevent accidents.