Band 1 and Band 2 voltages are defined as which ranges?

• A. Band 1 is extra low voltage below 50 V; Band 2 is low voltage 50–1000 V.
• B. Band 1 is extra low voltage below 50 V; Band 2 is low voltage 0–50 V.
• C. Band 1 is extra low voltage below 50 V; Band 2 is low voltage 1000–2000 V.
• D. Band 1 is extra low voltage below 60 V; Band 2 is low voltage 50–1000 V.

Answer: (A)

In electrical installation practice, voltages are grouped into bands to guide safety rules and equipment classification. Extra-low voltage means voltages that are very unlikely to cause serious harm, so the threshold is set at 50 V. This makes Band 1 fall under 50 V. The next band, Band 2, covers higher voltages that still aren’t “high voltage” but require more protection and insulation, defined as 50 V up to 1000 V. So the accepted ranges are Band 1 below 50 V and Band 2 from 50 V to 1000 V. This boundary at 50 V is used because the risk of electric shock becomes more significant above that level, necessitating stricter safety measures.