Which statement about low voltage ranges is accurate?

Which statement about low voltage ranges is accurate?

• A. Up to 1000 V; residential use 120/240 V, and 208/230 V is common in commercial/industrial.
• B. Up to 600 V; all systems use 120/240 V.
• C. Up to 2000 V; 208/230 V is DC.
• D. Up to 50 V; 120/240 V is not used.

Answer: (A)

Low voltage is defined by the voltages used in typical building electrical systems and the safety standards that apply to them. In many codes, low voltage covers up to 1000 V AC. In practical terms, residential service is usually 120/240 V, while commercial and industrial setups commonly run around 208/230 V for three-phase distribution. This alignment makes the statement accurate. The other ideas don’t fit typical practice: a 600 V cap would exclude common commercial voltages; saying all systems are 120/240 V ignores the 208/230 V cases; 208/230 V are AC, not DC; and implying a limit as low as 50 V contradicts standard building voltages.

Low voltage is defined by the voltages used in typical building electrical systems and the safety standards that apply to them. In many codes, low voltage covers up to 1000 V AC. In practical terms, residential service is usually 120/240 V, while commercial and industrial setups commonly run around 208/230 V for three-phase distribution. This alignment makes the statement accurate.

The other ideas don’t fit typical practice: a 600 V cap would exclude common commercial voltages; saying all systems are 120/240 V ignores the 208/230 V cases; 208/230 V are AC, not DC; and implying a limit as low as 50 V contradicts standard building voltages.