Probable Effect Concentration Quotients (PECQS) Practice Test

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On what temperature basis should vertical clearances of service-drop conductors be determined?

25ºC
20ºC
15ºC
10ºC

The correct answer is: 15ºC

The temperature basis for determining vertical clearances of service-drop conductors is typically taken as 15ºC. This standard is based on average environmental conditions, which ensure adequate spacing and safety for electrical installations. At this temperature, the conductor’s thermal expansion and contraction are taken into account, which helps to prevent potential issues such as sagging or contact with obstructions. This standardization also helps in minimizing risks related to weather variations and ensures that clearances remain safe under normal operating conditions, thus maintaining the integrity of the electrical supply system. Choosing a temperature that accurately reflects common ambient conditions helps ensure uniform application of safety practices across different regions.