Electrical segregation defines two voltage bands. What are the voltage ranges for band 1 and band 2?

• A. Band 1: 50 to 1000 V; Band 2: less than 50 V.
• B. Band 1: 0 to 24 V; Band 2: 24 to 1000 V.
• C. Band 1: less than 50 V; Band 2: 50 to 1000 V.
• D. Band 1: less than 100 V; Band 2: 100 to 1000 V.

Answer: (C)

Two voltage bands are used to guide safety measures by separating lower-risk and higher-risk voltages. The first band covers voltages below 50 V, while the second band covers voltages from 50 V up to 1000 V. The 50 V threshold is chosen because currents at or below this level are generally unlikely to cause serious harm in normal conditions, so simpler protective measures can be used. Once the voltage exceeds 50 V, the risk of electric shock and arcing increases, requiring stronger insulation, barriers, and proper isolation. So, the ranges are: band 1 is less than 50 V, band 2 is 50 to 1000 V.