Probable Effect Concentration Quotients (PECQS) Practice Test

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What is the minimum creepage distance between open conductors?

50 mm
75 mm
100 mm
150 mm

The correct answer is: 100 mm

The minimum creepage distance between open conductors is set to ensure safety and reduce the risk of electrical discharge or arcing that can occur due to dust, moisture, or other environmental factors. A distance of 100 mm aligns with industry standards which take into account various factors such as the voltage level, environmental conditions, and material properties. Having a creepage distance of 100 mm provides a good balance between safety and design efficiency, allowing for proper insulation and voltage withstand. This ensures that any potential creepage paths (the paths of least resistance that electricity may follow) between conductors are adequately separated, minimizing the risk of unintended electrical connections. While other distances mentioned may seem plausible, they do not meet the established safety thresholds as effectively as 100 mm does, which is why this option is the correct choice.